append ffmpeg dist

2026-02-13 23:49:43 -07:00
parent 66882233b0
commit 57f95fc74d
2 changed files with 357 additions and 0 deletions
@@ -0,0 +1,263 @@
+#!/usr/bin/env python3
+from queue import SimpleQueue, Empty
+from subprocess import Popen, DEVNULL, PIPE, TimeoutExpired
+import select
+from shutil import rmtree
+from glob import glob
+from os import mkdir, unlink, listdir, environ
+from os.path import basename, abspath, expanduser, isfile, isdir, getsize
+from threading import Thread
+from time import sleep
+from typing import List, NamedTuple, Callable, Union
+from signal import signal, SIGINT
+from sys import exit, stderr
+from shlex import split, join
+from hashlib import md5
+from time import strptime
+from tqdm import tqdm
+import re
+
+DEBUG = 'DEBUG' in environ
+
+def dprint(*args, **kwargs):
+    if DEBUG:
+        print(*args, *kwargs)
+
+def _popen(args, **kwargs):
+    dprint(f'calling subprocess: {args}')
+    kwargs['stderr'] = PIPE
+    kwargs['stdout'] = DEVNULL
+    kwargs['universal_newlines'] = True
+    return Popen(args, **kwargs)
+
+class Task(NamedTuple):
+    input_file: str
+    output_file: str
+    ffmpeg_args: List[str] = []
+
+class FFMPEGProc:
+    _duration_re = re.compile(r'.*Duration:\s*-?(?P<time_h>[0-9]+):(?P<time_m>[0-9]+):(?P<time_s>[0-9.]+),')
+    _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')
+
+    @staticmethod
+    def _match_to_sec(match):
+        return int(match.group('time_h'))*3600+int(match.group('time_m'))*60+float(match.group('time_s'))
+
+    def __init__(self, cmd: Union[list, str], shell=False, stdin=DEVNULL, stdout=DEVNULL, update_callback: Callable[[int,int,float,float,float], None] = None):
+        self._cmd = cmd
+        self._update_callback = update_callback
+        self._should_stop = False
+        self._shell = shell
+        self._duration = None
+        self._stdin = stdin
+        self._stdout = stdout
+        self.stderr = ''
+
+    def stop(self):
+        self._should_stop = True
+
+    def run(self):
+        self._proc = Popen(self._cmd, shell=self._shell, stderr=PIPE, stdin=self._stdin, stdout=self._stdout, universal_newlines=True)
+        poll = select.poll()
+        poll.register(self._proc.stderr)
+        while self._proc.poll() is None and not self._should_stop:
+            if not poll.poll(1):
+                sleep(0.1)
+                continue
+            sleep(0.001)
+            line = self._proc.stderr.readline()
+            match = self._progress_re.match(line)
+            if not match:
+                self.stderr += line
+
+            if match and self._update_callback:
+                self._update_callback(
+                    int(match.group('frame')),
+                    int(match.group('fps')),
+                    self._match_to_sec(match),
+                    self._duration,
+                    float(match.group('speed'))
+                )
+            elif self._duration is None:
+                match = self._duration_re.match(line)
+                if match:
+                    self._duration = self._match_to_sec(match)
+
+        try:
+            out, err = self._proc.communicate(timeout=1)
+            self.stderr += err
+        except TimeoutExpired as ex:
+            pass
+        return self._proc.returncode
+
+class TqdmAbsolute(tqdm):
+    def __init__(self, *args, **kwargs):
+        kwargs['bar_format'] = '{l_bar}{bar}|{n:.1f}/{total:.1f} [{elapsed}<{remaining}]'
+        kwargs['dynamic_ncols'] = True
+        if not 'total' in kwargs:
+            kwargs['total'] = 99999999
+        if not 'leave' in kwargs:
+            kwargs['leave'] = False
+        super().__init__(*args, **kwargs)
+    def update(self, to):
+        super().update(to - self.n)  # will also set self.n = b * bsize
+
+class TaskThread(Thread):
+    def __init__(self, host: str, task_queue: SimpleQueue, bar_pos):
+        super().__init__()
+        self._should_stop = False
+        self._host = host
+        self._task_queue = task_queue
+        self._ffmpeg = None
+        self._bar = TqdmAbsolute(desc=host, position=bar_pos)
+        self._current_file = None
+
+    def stop(self):
+        self._should_stop = True
+        if self._ffmpeg:
+            self._ffmpeg.stop()
+
+    def run(self):
+        def upd(frames, fps, time, duration, speed):
+            self._bar.total = duration or 999
+            self._bar.desc = self._host + ': ' + self._current_file
+            self._bar.update(time)
+        try:
+            while not self._should_stop:
+                task = self._task_queue.get(False)
+
+                self._current_file = basename(task.input_file)
+                with open(task.input_file, 'r') as infile, open(task.output_file, 'w') as outfile:
+                    ffmpeg_cmd = [
+                        'nice', '-n10', 'ionice', '-c3',
+                        'ffmpeg', '-f', 'matroska', '-i', 'pipe:',
+                        *task.ffmpeg_args,
+                        '-f', 'matroska', 'pipe:'
+                    ]
+                    if self._host != 'localhost':
+                        ffmpeg_cmd = ['ssh', self._host, join(ffmpeg_cmd)]
+                    self._ffmpeg = FFMPEGProc(ffmpeg_cmd, stdin=infile, stdout=outfile, update_callback=upd)
+
+                    ret = self._ffmpeg.run()
+                    if ret != 0:
+                        tqdm.write(f'task for {self._current_file} failed on host {self._host}', file=stderr)
+                        tqdm.write(self._ffmpeg.stderr, file=stderr)
+                        self._task_queue.put(task)
+        except Empty:
+            pass
+        self._bar.close()
+
+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):
+    input_file = abspath(expanduser(input_file))
+    output_file = abspath(expanduser(output_file))
+    tmp_dir = tmp_dir or 'ffmpeg_segments_'+md5(input_file.encode()).hexdigest()
+    tmp_in = f'{tmp_dir}/in'
+    tmp_out = f'{tmp_dir}/out'
+    try:
+        mkdir(tmp_dir)
+        mkdir(tmp_in)
+        mkdir(tmp_out)
+    except FileExistsError:
+        if not resume:
+            raise
+
+    # skip splitting on resume
+    if len(listdir(tmp_in)) == 0 or not resume:
+        cv = ['copy'] if copy_input else ['libx264', '-crf', '0', '-preset', 'ultrafast', '-bf', '0']
+        with TqdmAbsolute(desc="splitting input file") as bar:
+            def upd(frames, fps, time, duration, speed):
+                bar.total = duration
+                bar.update(time)
+            ffmpeg = FFMPEGProc([
+                    'ffmpeg', '-i', expanduser(input_file),
+                    '-an', '-sn',
+                    '-c:v', *cv,
+                    '-f', 'segment', '-reset_timestamps', '1', '-segment_time', str(segment_seconds) + 's',
+                    tmp_in + '/%08d.mkv'
+                ],
+                update_callback=upd
+            )
+            ret = ffmpeg.run()
+        if ret != 0:
+            tqdm.write(ffmpeg.stderr, file=stderr)
+            return
+
+    task_queue = SimpleQueue()
+    for f in sorted(glob(tmp_in+'/*')):
+        output_segment = tmp_out+f'/{basename(f)}'
+        # skip already encoded segments
+        if not isfile(output_segment):
+            task_queue.put(Task(f, output_segment, split(remote_args)))
+
+    threads = [TaskThread(host, task_queue, pos) for pos,host in enumerate(hosts,0)]
+
+    def sigint(sig, stack):
+        print('Got SIGINT, stopping...')
+        for thread in threads:
+            thread.stop()
+        for thread in threads:
+            thread.join()
+        exit(1)
+
+    signal(SIGINT, sigint)
+
+    for thread in threads:
+        thread.start()
+    for thread in threads:
+        thread.join()
+
+    with open('output_segments.txt', 'w') as f:
+        f.write('\n'.join([f"file '{file}'" for file in sorted(glob(tmp_out+'/*'))]))
+
+    with TqdmAbsolute(desc='concatenating output segments') as bar:
+        def upd(frames, fps, time, duration, speed):
+            bar.total = duration
+            bar.update(time)
+        ffmpeg = FFMPEGProc([
+                'ffmpeg', '-i', input_file,
+                '-f', 'concat', '-safe', '0', '-i', 'output_segments.txt',
+                '-map_metadata', '0:g',
+                '-map', '1:v',
+                '-map', '0:a?',
+                '-map', '0:s?',
+                '-c:v', 'copy',
+                '-c:s', 'copy',
+                *split(concat_args),
+                '-y', output_file
+            ],
+            update_callback=upd
+        )
+        if ffmpeg.run()  != 0:
+            tqdm.write(ffmpeg.stderr, file=stderr)
+            return
+    unlink('output_segments.txt')
+
+    if not keep_tmp:
+        rmtree(tmp_dir)
+
+if __name__ == '__main__':
+    import argparse
+    parser = argparse.ArgumentParser(description='Splits a file into segments and processes them on multiple hosts in parallel using ffmpeg over SSH.')
+    parser.add_argument('input_file', help='File to encode.')
+    parser.add_argument('output_file', help='Path to encoded output file.')
+    parser.add_argument('remote_args', help='Arguments to pass to the remote ffmpeg instances. For example: "-c:v libx264 -crf 23 -preset fast"')
+    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.')
+    parser.add_argument('-s', '--segment-length', type=float, default=10, help='Segment length in seconds.')
+    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)
+    parser.add_argument('-k', '--keep-tmp', action='store_true', help='Keep temporary segment files instead of deleting them on successful exit.')
+    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.')
+    parser.add_argument('-t', '--tmp-dir', default=None, help='Directory to use for temporary files. Should not already exist and will be deleted afterwards.')
+    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)')
+    args = parser.parse_args()
+    encode(
+        args.host,
+        args.input_file,
+        args.output_file,
+        segment_seconds=args.segment_length,
+        remote_args=args.remote_args,
+        concat_args=args.concat_args,
+        tmp_dir=args.tmp_dir,
+        keep_tmp=args.keep_tmp,
+        resume=args.resume,
+        copy_input=args.copy_input
+    )