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@ -295,8 +295,9 @@ def ffmpeg_cut_segment(segment, cut_start=None, cut_end=None):
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def ffmpeg_cut_stdin(output_file, cut_start, duration, encode_args):
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"""Return a Popen object which is ffmpeg cutting from stdin.
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This is used when doing a full cut.
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Note the explicit output file object instead of using a pipe,
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because most video formats require a seekable file.
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If output_file is not subprocess.PIPE,
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uses explicit output file object instead of using a pipe,
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because some video formats require a seekable file.
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"""
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args = [
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'ffmpeg',
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@ -304,7 +305,11 @@ def ffmpeg_cut_stdin(output_file, cut_start, duration, encode_args):
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'-i', '-',
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'-ss', cut_start,
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'-t', duration,
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] + list(encode_args) + [
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] + list(encode_args)
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if output_file is subprocess.PIPE:
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args.append('-') # output to stdout
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else:
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args += [
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# We want ffmpeg to write to our tempfile, which is its stdout.
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# However, it assumes that '-' means the output is not seekable.
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# We trick it into understanding that its stdout is seekable by
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@ -401,41 +406,67 @@ def fast_cut_segments(segments, start, end):
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yield chunk
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@timed('cut', type='full', normalize=lambda _, segments, start, end, encode_args: (end - start).total_seconds())
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def full_cut_segments(segments, start, end, encode_args):
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def feed_input(segments, pipe):
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"""Write each segment's data into the given pipe in order.
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This is used to provide input to ffmpeg in a full cut."""
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for segment in segments:
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with open(segment.path) as f:
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try:
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shutil.copyfileobj(f, pipe)
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except OSError as e:
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# ignore EPIPE, as this just means the end cut meant we didn't need all it
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if e.errno != errno.EPIPE:
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raise
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pipe.close()
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@timed('cut',
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type=lambda _, segments, start, end, encode_args, stream=False: "full-streamed" if stream else "full-buffered",
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normalize=lambda _, segments, start, end, *a, **k: (end - start).total_seconds()),
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)
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def full_cut_segments(segments, start, end, encode_args, stream=False):
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"""If stream=true, assume encode_args gives a streamable format,
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and begin returning output immediately instead of waiting for ffmpeg to finish
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and buffering to disk."""
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# how far into the first segment to begin
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cut_start = max(0, (start - segments[0].start).total_seconds())
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# duration
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duration = (end - start).total_seconds()
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ffmpeg = None
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input_feeder = None
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try:
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# Most ffmpeg output formats require a seekable file.
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if stream:
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# When streaming, we can just use a pipe
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tempfile = subprocess.PIPE
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else:
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# Some ffmpeg output formats require a seekable file.
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# For the same reason, it's not safe to begin uploading until ffmpeg
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# has finished. We create a temporary file for this.
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tempfile = TemporaryFile()
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ffmpeg = ffmpeg_cut_stdin(tempfile, cut_start, duration, encode_args)
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input_feeder = gevent.spawn(feed_input, segments, ffmpeg.stdin)
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# stream the input
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for segment in segments:
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with open(segment.path) as f:
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try:
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shutil.copyfileobj(f, ffmpeg.stdin)
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except OSError as e:
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# ignore EPIPE, as this just means the end cut meant we didn't need all input
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if e.errno != errno.EPIPE:
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raise
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ffmpeg.stdin.close()
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# When streaming, we can return data as it is available
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if stream:
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for chunk in read_chunks(ffmpeg.stdout):
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yield chunk
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# check if any errors occurred in input writing, or if ffmpeg exited non-success.
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if ffmpeg.wait() != 0:
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raise Exception("Error while streaming cut: ffmpeg exited {}".format(ffmpeg.returncode))
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input_feeder.get() # re-raise any errors from feed_input()
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# Now actually yield the resulting file
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# When not streaming, we can only return the data once ffmpeg has exited
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if not stream:
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for chunk in read_chunks(tempfile):
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yield chunk
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finally:
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# if something goes wrong, try to clean up ignoring errors
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if input_feeder is not None:
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input_feeder.kill()
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if ffmpeg is not None and ffmpeg.poll() is None:
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for action in (ffmpeg.kill, ffmpeg.stdin.close, ffmpeg.stdout.close):
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try:
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Mike Lang
5 years ago
committed by
GitHub