470 lines
20 KiB
Python
470 lines
20 KiB
Python
#!/usr/bin/env python3
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from queue import SimpleQueue, Empty
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from subprocess import Popen, DEVNULL, PIPE, TimeoutExpired
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import select
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from shutil import rmtree
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from glob import glob
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from os import mkdir, unlink, listdir, environ
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from os.path import basename, abspath, expanduser, isfile, isdir, getsize
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from threading import Thread
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from time import sleep, time
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from typing import List, NamedTuple, Callable, Union, Tuple
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from signal import signal, SIGINT
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from sys import exit, stderr, platform as sys_platform
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from shlex import split, join
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from hashlib import md5
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from time import strptime
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from tqdm import tqdm
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import re
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DEBUG = 'DEBUG' in environ
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def dprint(*args, **kwargs):
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if DEBUG:
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print(*args, *kwargs)
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def _popen(args, **kwargs):
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dprint(f'calling subprocess: {args}')
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kwargs['stderr'] = PIPE
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kwargs['stdout'] = DEVNULL
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kwargs['universal_newlines'] = True
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return Popen(args, **kwargs)
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def _get_keyframe_times(input_file: str, probe_host: str = None, probe_path: str = None) -> List[float]:
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"""Run ffprobe to get keyframe timestamps (seconds). Uses -skip_frame nokey so only keyframes are read (fast).
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If probe_host and probe_path are set, run ffprobe there via ssh so the file is read at local disk speed."""
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cmd = [
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'ffprobe', '-v', 'error', '-select_streams', 'v:0', '-skip_frame', 'nokey',
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'-show_entries', 'frame=pts_time', '-of', 'csv=p=0',
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probe_path if (probe_host and probe_path) else input_file
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]
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if probe_host and probe_path:
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cmd = ['ssh', probe_host, join(cmd)]
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proc = Popen(cmd, stdout=PIPE, stderr=PIPE, universal_newlines=True)
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out, err = proc.communicate()
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if proc.returncode != 0 and err:
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dprint('ffprobe keyframes:', err)
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out = out or ''
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times = []
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for line in out.strip().splitlines():
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line = line.strip().split('=')[-1] if '=' in line else line.strip()
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if not line:
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continue
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try:
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times.append(float(line))
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except ValueError:
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pass
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return sorted(times)
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def _get_duration_seconds(input_file: str, probe_host: str = None, probe_path: str = None) -> float:
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"""Get container duration in seconds via ffprobe (header-only, fast). If probe_host set, run there."""
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path = probe_path if (probe_host and probe_path) else input_file
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cmd = ['ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'csv=p=0', path]
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if probe_host and probe_path:
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cmd = ['ssh', probe_host, join(cmd)]
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proc = Popen(cmd, stdout=PIPE, stderr=PIPE, universal_newlines=True)
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out, _ = proc.communicate()
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out = (out or '').strip()
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try:
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if out:
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return float(out)
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except ValueError:
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pass
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cmd = ['ffprobe', '-v', 'error', '-select_streams', 'v:0', '-show_entries', 'stream=duration', '-of', 'csv=p=0', path]
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if probe_host and probe_path:
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cmd = ['ssh', probe_host, join(cmd)]
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proc = Popen(cmd, stdout=PIPE, stderr=PIPE, universal_newlines=True)
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out, _ = proc.communicate()
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out = (out or '').strip()
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try:
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if out:
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return float(out)
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except ValueError:
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pass
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return 0.0
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def _segment_valid(segment_path: str, expected_duration_sec: float, tolerance_sec: float = 0.1) -> bool:
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"""Return True if ffprobe succeeds on segment and duration matches expected within tolerance (like check_files.py)."""
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proc = Popen(
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['ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'csv=p=0', segment_path],
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stdout=PIPE, stderr=PIPE, universal_newlines=True
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)
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out, _ = proc.communicate()
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if proc.returncode != 0:
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return False
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out = (out or '').strip()
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try:
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duration = float(out)
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except ValueError:
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return False
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return abs(duration - expected_duration_sec) <= tolerance_sec
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def _build_segments(keyframe_times: List[float], segment_seconds: float, total_duration: float) -> List[Tuple[float, float]]:
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"""Build (start_sec, end_sec) segments at keyframe boundaries. When keyframe probe fails, use fixed segment_seconds."""
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if total_duration <= 0:
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return []
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if not keyframe_times or len(keyframe_times) == 1:
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# No keyframes: split at fixed intervals so we still get multiple segments
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segments = []
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start = 0.0
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while start < total_duration:
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end = min(start + segment_seconds, total_duration)
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segments.append((start, end))
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start = end
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return segments
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segments = []
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i = 0
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while i < len(keyframe_times):
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start = keyframe_times[i]
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end_target = start + segment_seconds
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j = i + 1
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while j < len(keyframe_times) and keyframe_times[j] < end_target:
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j += 1
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if j < len(keyframe_times):
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end = keyframe_times[j]
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else:
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end = total_duration
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segments.append((start, end))
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i = j
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return segments
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class Task(NamedTuple):
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start_sec: float
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duration_sec: float
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output_file: str
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ffmpeg_args: List[str]
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class FFMPEGProc:
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_duration_re = re.compile(r'.*Duration:\s*-?(?P<time_h>[0-9]+):(?P<time_m>[0-9]+):(?P<time_s>[0-9.]+),')
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_progress_re = re.compile(r'frame=\s*(?P<frame>[0-9]+)\s+fps=\s*(?P<fps>[0-9]+).*time=-?(?P<time_h>[0-9]+):(?P<time_m>[0-9]+):(?P<time_s>[0-9,.]+)\s+.*speed=(?P<speed>[0-9\.]+)x')
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@staticmethod
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def _match_to_sec(match):
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return int(match.group('time_h'))*3600+int(match.group('time_m'))*60+float(match.group('time_s'))
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def __init__(self, cmd: Union[list, str], shell=False, stdin=DEVNULL, stdout=DEVNULL, update_callback: Callable[[int,int,float,float,float], None] = None, binary_io=False, echo_stderr=False):
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self._cmd = cmd
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self._update_callback = update_callback
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self._should_stop = False
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self._shell = shell
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self._duration = None
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self._stdin = stdin
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self._stdout = stdout
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self._binary_io = binary_io
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self._echo_stderr = echo_stderr
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self.stderr = ''
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def stop(self):
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self._should_stop = True
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def _read_stderr_loop(self, stderr_lines: list):
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"""Read stderr in a loop (used on Windows where select.poll is unavailable)."""
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while True:
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raw = self._proc.stderr.readline()
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if not raw and self._proc.poll() is not None:
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break
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if raw:
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line = raw.decode(errors='replace') if self._binary_io else raw
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stderr_lines.append(line)
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if self._echo_stderr:
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tqdm.write(line.rstrip(), file=stderr)
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match = self._progress_re.match(line)
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if match and self._update_callback:
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self._update_callback(
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int(match.group('frame')),
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int(match.group('fps')),
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self._match_to_sec(match),
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self._duration,
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float(match.group('speed')),
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)
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elif self._duration is None:
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dm = self._duration_re.match(line)
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if dm:
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self._duration = self._match_to_sec(dm)
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def run(self):
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self._proc = Popen(
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self._cmd, shell=self._shell, stderr=PIPE, stdin=self._stdin, stdout=self._stdout,
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universal_newlines=not self._binary_io
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)
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if getattr(select, 'poll', None):
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poll = select.poll()
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poll.register(self._proc.stderr)
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while self._proc.poll() is None and not self._should_stop:
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if not poll.poll(1):
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sleep(0.1)
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continue
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sleep(0.001)
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raw = self._proc.stderr.readline()
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line = raw.decode(errors='replace') if self._binary_io and raw else (raw or '')
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if self._echo_stderr and line:
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tqdm.write(line.rstrip(), file=stderr)
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match = self._progress_re.match(line)
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if not match:
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self.stderr += line
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if match and self._update_callback:
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self._update_callback(
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int(match.group('frame')),
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int(match.group('fps')),
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self._match_to_sec(match),
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self._duration,
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float(match.group('speed')),
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)
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elif self._duration is None:
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match = self._duration_re.match(line)
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if match:
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self._duration = self._match_to_sec(match)
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try:
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_, err = self._proc.communicate(timeout=1)
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if err and self._binary_io:
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err = err.decode(errors='replace') if isinstance(err, bytes) else err
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self.stderr += err or ''
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except TimeoutExpired:
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pass
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else:
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stderr_lines = []
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reader = Thread(target=self._read_stderr_loop, args=(stderr_lines,), daemon=True)
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reader.start()
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while self._proc.poll() is None and not self._should_stop:
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sleep(0.2)
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reader.join(timeout=2)
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self.stderr = ''.join(stderr_lines)
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return self._proc.returncode
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class TqdmAbsolute(tqdm):
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def __init__(self, *args, **kwargs):
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kwargs['bar_format'] = '{l_bar}{bar}|{n:.1f}/{total:.1f} [{elapsed}<{remaining}]'
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kwargs['dynamic_ncols'] = True
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if not 'total' in kwargs:
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kwargs['total'] = 99999999
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if not 'leave' in kwargs:
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kwargs['leave'] = False
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super().__init__(*args, **kwargs)
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def update(self, to):
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super().update(to - self.n) # will also set self.n = b * bsize
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HOST_COLORS = ['\033[94m', '\033[92m', '\033[93m', '\033[95m', '\033[96m', '\033[91m'] # blue, green, yellow, magenta, cyan, red
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RESET = '\033[0m'
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class TaskThread(Thread):
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def __init__(self, host: str, source_file: str, task_queue: SimpleQueue, bar_pos: int, remote_ffmpeg_path: str = None):
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super().__init__()
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self._should_stop = False
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self._host = host
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self._bar_pos = bar_pos
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self._remote_ffmpeg_path = remote_ffmpeg_path
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self._source_file = source_file
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self._task_queue = task_queue
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self._ffmpeg = None
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self._bar = TqdmAbsolute(desc=host, position=bar_pos)
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self._current_file = None
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def _host_tag(self):
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c = HOST_COLORS[self._bar_pos % len(HOST_COLORS)]
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return f'{c}{self._host}{RESET}'
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def stop(self):
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self._should_stop = True
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if self._ffmpeg:
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self._ffmpeg.stop()
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def run(self):
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last_log = [0.0] # mutable for progress heartbeat
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def upd(frames, fps, t, duration, speed):
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self._bar.total = duration or 999
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self._bar.desc = self._host + ': ' + (self._current_file or '')
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self._bar.update(t)
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if duration and duration > 0 and (time() - last_log[0]) >= 30:
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tqdm.write(f' {self._host_tag()}: {self._current_file} {t:.0f}s / {duration:.0f}s ({speed:.1f}x)', file=stderr)
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stderr.flush()
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last_log[0] = time()
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try:
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while not self._should_stop:
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task = self._task_queue.get(False)
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self._current_file = basename(task.output_file)
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tqdm.write(f' {self._host_tag()}: starting {self._current_file} (t={task.start_sec:.0f}-{task.start_sec+task.duration_sec:.0f}s)', file=stderr)
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stderr.flush()
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reader_cmd = [
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'ffmpeg', '-ss', str(task.start_sec), '-t', str(task.duration_sec),
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'-i', self._source_file, '-an', '-sn', '-c:v', 'copy', '-f', 'mpegts', 'pipe:1'
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]
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ffmpeg_bin = (self._remote_ffmpeg_path or 'ffmpeg') if self._host != 'localhost' else 'ffmpeg'
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encoder_cmd = [
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ffmpeg_bin, '-f', 'mpegts', '-i', 'pipe:',
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*task.ffmpeg_args,
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'-f', 'mpegts', 'pipe:1'
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]
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if self._host == 'localhost' and sys_platform != 'win32':
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encoder_cmd = ['nice', '-n10', 'ionice', '-c3'] + encoder_cmd
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if self._host != 'localhost':
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encoder_cmd = ['ssh', '-o', 'ConnectTimeout=15', self._host, join(encoder_cmd)]
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reader_proc = Popen(reader_cmd, stdout=PIPE, stderr=DEVNULL)
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ret = -1
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try:
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with open(task.output_file, 'wb') as outfile:
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self._ffmpeg = FFMPEGProc(
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encoder_cmd, stdin=reader_proc.stdout, stdout=outfile,
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update_callback=upd, binary_io=True
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)
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ret = self._ffmpeg.run()
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finally:
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try:
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reader_proc.wait(timeout=2)
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except TimeoutExpired:
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reader_proc.terminate()
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reader_proc.wait(timeout=5)
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if ret != 0:
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try:
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if isfile(task.output_file):
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unlink(task.output_file)
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except OSError:
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pass
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print(f' {self._host_tag()}: FAILED {self._current_file}', file=stderr, flush=True)
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if self._ffmpeg.stderr:
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print(self._ffmpeg.stderr, file=stderr, end='', flush=True)
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self._task_queue.put(task)
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else:
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tqdm.write(f' {self._host_tag()}: done {self._current_file}', file=stderr)
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stderr.flush()
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except Empty:
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pass
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self._bar.close()
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def encode(hosts: List[str], input_file: str, output_file: str, segment_seconds: float = 60, remote_args: str = '', concat_args: str = '', tmp_dir: str = None, keep_tmp=False, resume=False, copy_input=False, probe_host: str = None, probe_path: str = None, remote_ffmpeg_path: str = None):
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input_file = abspath(expanduser(input_file))
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output_file = abspath(expanduser(output_file))
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tmp_dir = tmp_dir or 'ffmpeg_segments_'+md5(input_file.encode()).hexdigest()
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try:
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mkdir(tmp_dir)
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except FileExistsError:
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pass # previous job: resume and re-queue failed segments
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verbose = environ.get('VERBOSE', '').lower() in ('1', 'true', 'yes')
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tqdm.write('[1/4] Probing keyframes and duration...', file=stderr)
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stderr.flush()
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keyframe_times = _get_keyframe_times(input_file, probe_host, probe_path)
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total_duration = _get_duration_seconds(input_file, probe_host, probe_path)
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segments = _build_segments(keyframe_times, segment_seconds, total_duration)
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if not segments:
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tqdm.write(f'No segments for {input_file} (keyframes={len(keyframe_times)}, duration={total_duration}). Check ffprobe.', file=stderr)
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return
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MIN_SEGMENT_BYTES = 1024 # smaller = failed/corrupt segment, re-encode
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DURATION_TOLERANCE_SEC = 0.1 # same as check_files.py
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task_queue = SimpleQueue()
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removed = 0
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for i, (start_sec, end_sec) in enumerate(segments):
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duration_sec = end_sec - start_sec
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output_path = f'{tmp_dir}/{i:08d}.ts'
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if isfile(output_path):
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try:
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if getsize(output_path) < MIN_SEGMENT_BYTES:
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unlink(output_path)
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removed += 1
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elif not _segment_valid(output_path, duration_sec, DURATION_TOLERANCE_SEC):
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unlink(output_path)
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removed += 1
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else:
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continue
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except OSError:
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pass
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task_queue.put(Task(start_sec, duration_sec, output_path, split(remote_args)))
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n_tasks = task_queue.qsize()
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if removed:
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tqdm.write(f'[2/4] Removed {removed} bad segment(s) (ffprobe failed or duration mismatch), re-queued.', file=stderr)
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if n_tasks == 0:
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tqdm.write('All segments already done (resume).', file=stderr)
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else:
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tqdm.write(f'[2/4] Queued {n_tasks} segments (keyframes={len(keyframe_times)}, duration={total_duration:.1f}s)', file=stderr)
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stderr.flush()
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dprint(f'Segments: {len(segments)} total, {n_tasks} tasks queued')
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tqdm.write(f'[3/4] Encoding segments on {len(hosts)} host(s)...', file=stderr)
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stderr.flush()
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threads = [TaskThread(host, input_file, task_queue, pos, remote_ffmpeg_path) for pos, host in enumerate(hosts, 0)]
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def sigint(sig, stack):
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print('Got SIGINT, stopping...')
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for thread in threads:
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thread.stop()
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for thread in threads:
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thread.join()
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exit(1)
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signal(SIGINT, sigint)
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for thread in threads:
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thread.start()
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for thread in threads:
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thread.join()
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list_path = f'{tmp_dir}/output_segments.txt'
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with open(list_path, 'w') as f:
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f.write('\n'.join([f"file '{fpath}'" for fpath in sorted(glob(f'{tmp_dir}/*.ts'))]))
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tqdm.write('[4/4] Concatenating segments and muxing with audio...', file=stderr)
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concat_extra = ['-stats_period', '5'] if verbose else []
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concat_cmd = [
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'ffmpeg', *concat_extra, '-i', input_file,
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'-f', 'concat', '-safe', '0', '-i', list_path,
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'-map_metadata', '0:g',
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'-map', '1:v', '-map', '0:a?', '-map', '0:s?',
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'-c:v', 'copy', '-c:s', 'copy',
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*split(concat_args),
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'-y', output_file
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]
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tqdm.write('Concat ffmpeg: ' + ' '.join(join([x]) for x in concat_cmd), file=stderr)
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with TqdmAbsolute(desc='concatenating output segments') as bar:
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def upd(frames, fps, time, duration, speed):
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bar.total = duration
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bar.update(time)
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ffmpeg = FFMPEGProc(concat_cmd, update_callback=upd, echo_stderr=verbose)
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if ffmpeg.run() != 0:
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tqdm.write(ffmpeg.stderr, file=stderr)
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return
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unlink(list_path)
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if not keep_tmp:
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rmtree(tmp_dir)
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if __name__ == '__main__':
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import argparse
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parser = argparse.ArgumentParser(description='Splits a file into segments and processes them on multiple hosts in parallel using ffmpeg over SSH.')
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parser.add_argument('input_file', help='File to encode.')
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parser.add_argument('output_file', help='Path to encoded output file.')
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parser.add_argument('remote_args', help='Arguments to pass to the remote ffmpeg instances. For example: "-c:v libx264 -crf 23 -preset fast"')
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parser.add_argument('concat_args', default='', help='Arguments to pass to the local ffmpeg concatenating the processed video segments and muxing it with the original audio/subs/metadata. Mainly useful for audio encoding options, or "-an" to get rid of it.')
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parser.add_argument('-s', '--segment-length', type=float, default=10, help='Segment length in seconds.')
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parser.add_argument('-H', '--host', action='append', help='SSH hostname(s) to encode on. Use "localhost" to include the machine you\'re running this from. Can include username.', required=True)
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parser.add_argument('-k', '--keep-tmp', action='store_true', help='Keep temporary segment files instead of deleting them on successful exit.')
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parser.add_argument('-r', '--resume', action='store_true', help='Don\'t split the input file again, keep existing segments and only process the missing ones.')
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parser.add_argument('-t', '--tmp-dir', default=None, help='Directory to use for temporary files. Should not already exist and will be deleted afterwards.')
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parser.add_argument('-c', '--copy-input', action='store_true', help='Don\'t (losslessly) re-encode input while segmenting. Only use this if your input segments frame-perfectly with "-c:v copy" (i.e. it has no B-frames)')
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parser.add_argument('-P', '--probe-host', default=None, help='SSH host to run ffprobe on (file must be at --probe-path there). Speeds up [1/4] when input is on slow/NAS path.')
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parser.add_argument('--probe-path', default=None, help='Path to input file as seen on --probe-host (required if -P set).')
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args = parser.parse_args()
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encode(
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args.host,
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args.input_file,
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args.output_file,
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segment_seconds=args.segment_length,
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remote_args=args.remote_args,
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concat_args=args.concat_args,
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tmp_dir=args.tmp_dir,
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keep_tmp=args.keep_tmp,
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resume=args.resume,
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copy_input=args.copy_input,
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probe_host=args.probe_host,
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probe_path=args.probe_path
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)
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