chop/encode mp4 and include subtitles
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3 changed files with 240 additions and 18 deletions
202
pandora/archive/chop.py
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202
pandora/archive/chop.py
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import json
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import os
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import subprocess
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from bisect import bisect_left
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import ox
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class Chop(object):
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keyframes = []
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subtitles = None
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info = {}
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ffmpeg = [
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'ffmpeg',
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'-nostats', '-loglevel', 'error',
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'-y',
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]
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def __init__(self, source, output, start, end, subtitles=None):
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self.video = source
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self.subtitles = subtitles
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output_file, output_ext = os.path.splitext(output)
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sections = self.get_gop_sections(start, end)
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if output_ext == '.mp4':
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part_ext = '.ts'
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else:
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part_ext = output_ext
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start_part = output + '.start' + part_ext
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middle_part = output + '.middle' + part_ext
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end_part = output + '.end' + part_ext
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segments = []
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cmds = []
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# prepare subtitles
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if self.subtitles:
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self.subtitles_output = output_file + '.srt'
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cmd = self.ffmpeg + [
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'-i', self.subtitles,
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'-ss', '%f' % start, '-t', '%f' % (end-start),
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self.subtitles_output
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]
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cmds.append(cmd)
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# re-encode up to keyframe
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if sections['start'][1] > sections['start'][0]:
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cmd = self.encode(source, start_part,
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start=start,
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duration=sections['start'][1] - start)
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cmds.append(cmd)
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segments.append(start_part)
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# cut out middle segment
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if sections['end'][1] - sections['start'][2] > 0:
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cmd = self.copy(source, middle_part,
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start=sections['start'][2],
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duration=sections['end'][1] - sections['start'][2])
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cmds.append(cmd)
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segments.append(middle_part)
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# re-encode after last keyframe
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if sections['end'][2] > sections['end'][1]:
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cmd = self.encode(source, end_part,
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start=sections['end'][1],
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duration=end - sections['end'][1])
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cmds.append(cmd)
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segments.append(end_part)
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if len(segments) > 1:
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cmd, files = self.join(segments, output)
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cmds.append(cmd)
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segments += files
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else:
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cmds.append(['cp', segments[0], output])
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for cmd in cmds:
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#print(' '.join(cmd))
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subprocess.call(cmd)
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for segment in segments:
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os.unlink(segment)
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def get_info(self):
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if self.info:
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return self.info
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self.info = ox.avinfo(self.video)
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return self.info
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def get_keyframes(self):
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video = self.video
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if self.keyframes:
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return self.keyframes
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keyframes_cache = video + '.keyframes'
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if os.path.exists(keyframes_cache):
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with open(keyframes_cache, 'r') as fd:
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self.keyframes = json.load(fd)
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return self.keyframes
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cmd = [
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'ffprobe',
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'-v', 'error',
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'-show_packets', '-select_streams', 'v',
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'-show_entries', 'packet=pts_time,flags',
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'-of', 'csv',
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'-i', video
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]
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
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stdout, stderr = p.communicate()
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result = stdout.decode().strip()
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keyframe_times = []
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timecode = 0
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for line in result.split('\n'):
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if line.split(',')[1] != 'N/A':
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timecode = line.split(',')[1]
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if ',K' in line:
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keyframe_times.append(float(timecode))
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last_keyframe = self.get_info()['duration']
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if keyframe_times[-1] != last_keyframe:
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keyframe_times.append(last_keyframe)
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self.keyframes = keyframe_times
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if not os.path.exists(keyframes_cache):
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with open(keyframes_cache, 'w') as fd:
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json.dump(keyframe_times, fd)
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return keyframe_times
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def get_gop_sections(self, start: float, end: float) -> dict:
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keyframes = self.get_keyframes()
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start_pos = bisect_left(keyframes, start)
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end_pos = bisect_left(keyframes, end)
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return {
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'start': (
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keyframes[start_pos - 1] if start_pos > 0 else keyframes[start_pos],
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keyframes[start_pos],
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keyframes[start_pos + 1]
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),
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'end': (
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keyframes[end_pos - 2] if end_pos != (len(keyframes) - 1) else keyframes[end_pos - 1],
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keyframes[end_pos - 1] if end_pos != (len(keyframes) - 1) else keyframes[end_pos],
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keyframes[end_pos]
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)
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}
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def encode(self, source, target, start, duration):
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info = self.get_info()
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if self.info['audio']:
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acodec = [
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'-c:a',
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self.info['audio'][0]['codec']
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]
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else:
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acodec = []
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vcodec = [
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'-c:v',
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self.info['video'][0]['codec']
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]
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cmd = self.ffmpeg + [
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'-ss', '%f' % start,
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'-i', source,
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'-t', '%f' % duration,
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'-reset_timestamps', '1',
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] + acodec + [
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] + vcodec + [
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target
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]
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return cmd
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def copy(self, source, target, start, duration):
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cmd = self.ffmpeg + [
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'-ss', '%f' % start,
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'-i', source,
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'-t', '%f' % duration,
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'-c:v', 'copy', '-c:a', 'copy',
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'-reset_timestamps', '1',
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target
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]
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return cmd
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def join(self, segments, target):
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file_list = target + '.txt'
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with open(file_list, 'w') as fd:
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for segment in segments:
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fd.write('file %s\n' % segment)
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if self.subtitles:
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subtitles = [
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'-i', self.subtitles_output,
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'-c:s', 'mov_text'
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]
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else:
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subtitles = []
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cmd = self.ffmpeg + [
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'-f', 'concat', '-safe', '0', '-i', file_list,
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] + subtitles + [
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'-c:v', 'copy', '-c:a', 'copy',
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'-reset_timestamps', '1',
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target
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]
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files = [file_list]
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if self.subtitles:
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files.append(self.subtitles_output)
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return cmd, files
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@ -602,11 +602,23 @@ def timeline_strip(item, cuts, info, prefix):
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timeline_image.save(timeline_file)
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def chop(video, start, end):
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def chop(video, start, end, subtitles=None):
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t = end - start
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tmp = tempfile.mkdtemp()
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ext = os.path.splitext(video)[1]
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choped_video = '%s/tmp%s' % (tmp, ext)
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if subtitles and ext == '.mp4':
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subtitles_f = choped_video + '.full.srt'
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with open(subtitles_f, 'wb') as fd:
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fd.write(subtitles)
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else:
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subtitles_f = None
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if ext == '.mp4':
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from .chop import Chop
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Chop(video, choped_video, start, end, subtitles_f)
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if subtitles_f:
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os.unlink(subtitles_f)
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else:
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cmd = [
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settings.FFMPEG,
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'-y',
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@ -1044,7 +1044,15 @@ def video(request, id, resolution, format, index=None, track=None):
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content_type = mimetypes.guess_type(path)[0]
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if len(t) == 2 and t[1] > t[0] and duration >= t[1]:
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response = HttpResponse(extract.chop(path, t[0], t[1]), content_type=content_type)
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# FIXME: could be multilingual here
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subtitles = utils.get_by_key(settings.CONFIG['layers'], 'isSubtitles', True)
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if subtitles:
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srt = item.srt(subtitles['id'], encoder=ox.srt)
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if len(srt) < 4:
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srt = None
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else:
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srt = None
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response = HttpResponse(extract.chop(path, t[0], t[1], subtitles=srt), content_type=content_type)
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filename = u"Clip of %s - %s-%s - %s %s%s" % (
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item.get('title'),
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ox.format_duration(t[0] * 1000).replace(':', '.')[:-4],
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