chop/encode mp4 and include subtitles
This commit is contained in:
parent
0fd86dfa78
commit
ba5e4af355
|
|
@ -0,0 +1,202 @@
|
|||
import json
|
||||
import os
|
||||
import subprocess
|
||||
from bisect import bisect_left
|
||||
|
||||
import ox
|
||||
|
||||
class Chop(object):
|
||||
keyframes = []
|
||||
subtitles = None
|
||||
info = {}
|
||||
ffmpeg = [
|
||||
'ffmpeg',
|
||||
'-nostats', '-loglevel', 'error',
|
||||
'-y',
|
||||
]
|
||||
|
||||
def __init__(self, source, output, start, end, subtitles=None):
|
||||
self.video = source
|
||||
self.subtitles = subtitles
|
||||
output_file, output_ext = os.path.splitext(output)
|
||||
sections = self.get_gop_sections(start, end)
|
||||
|
||||
if output_ext == '.mp4':
|
||||
part_ext = '.ts'
|
||||
else:
|
||||
part_ext = output_ext
|
||||
start_part = output + '.start' + part_ext
|
||||
middle_part = output + '.middle' + part_ext
|
||||
end_part = output + '.end' + part_ext
|
||||
|
||||
segments = []
|
||||
cmds = []
|
||||
|
||||
# prepare subtitles
|
||||
if self.subtitles:
|
||||
self.subtitles_output = output_file + '.srt'
|
||||
cmd = self.ffmpeg + [
|
||||
'-i', self.subtitles,
|
||||
'-ss', '%f' % start, '-t', '%f' % (end-start),
|
||||
self.subtitles_output
|
||||
]
|
||||
cmds.append(cmd)
|
||||
|
||||
# re-encode up to keyframe
|
||||
if sections['start'][1] > sections['start'][0]:
|
||||
cmd = self.encode(source, start_part,
|
||||
start=start,
|
||||
duration=sections['start'][1] - start)
|
||||
cmds.append(cmd)
|
||||
segments.append(start_part)
|
||||
# cut out middle segment
|
||||
if sections['end'][1] - sections['start'][2] > 0:
|
||||
cmd = self.copy(source, middle_part,
|
||||
start=sections['start'][2],
|
||||
duration=sections['end'][1] - sections['start'][2])
|
||||
cmds.append(cmd)
|
||||
segments.append(middle_part)
|
||||
# re-encode after last keyframe
|
||||
if sections['end'][2] > sections['end'][1]:
|
||||
cmd = self.encode(source, end_part,
|
||||
start=sections['end'][1],
|
||||
duration=end - sections['end'][1])
|
||||
cmds.append(cmd)
|
||||
segments.append(end_part)
|
||||
|
||||
if len(segments) > 1:
|
||||
cmd, files = self.join(segments, output)
|
||||
cmds.append(cmd)
|
||||
segments += files
|
||||
else:
|
||||
cmds.append(['cp', segments[0], output])
|
||||
|
||||
for cmd in cmds:
|
||||
#print(' '.join(cmd))
|
||||
subprocess.call(cmd)
|
||||
for segment in segments:
|
||||
os.unlink(segment)
|
||||
|
||||
def get_info(self):
|
||||
if self.info:
|
||||
return self.info
|
||||
self.info = ox.avinfo(self.video)
|
||||
return self.info
|
||||
|
||||
def get_keyframes(self):
|
||||
video = self.video
|
||||
if self.keyframes:
|
||||
return self.keyframes
|
||||
|
||||
keyframes_cache = video + '.keyframes'
|
||||
if os.path.exists(keyframes_cache):
|
||||
with open(keyframes_cache, 'r') as fd:
|
||||
self.keyframes = json.load(fd)
|
||||
return self.keyframes
|
||||
|
||||
cmd = [
|
||||
'ffprobe',
|
||||
'-v', 'error',
|
||||
'-show_packets', '-select_streams', 'v',
|
||||
'-show_entries', 'packet=pts_time,flags',
|
||||
'-of', 'csv',
|
||||
'-i', video
|
||||
]
|
||||
p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
|
||||
stdout, stderr = p.communicate()
|
||||
result = stdout.decode().strip()
|
||||
keyframe_times = []
|
||||
timecode = 0
|
||||
for line in result.split('\n'):
|
||||
if line.split(',')[1] != 'N/A':
|
||||
timecode = line.split(',')[1]
|
||||
if ',K' in line:
|
||||
keyframe_times.append(float(timecode))
|
||||
|
||||
last_keyframe = self.get_info()['duration']
|
||||
if keyframe_times[-1] != last_keyframe:
|
||||
keyframe_times.append(last_keyframe)
|
||||
|
||||
self.keyframes = keyframe_times
|
||||
if not os.path.exists(keyframes_cache):
|
||||
with open(keyframes_cache, 'w') as fd:
|
||||
json.dump(keyframe_times, fd)
|
||||
return keyframe_times
|
||||
|
||||
def get_gop_sections(self, start: float, end: float) -> dict:
|
||||
keyframes = self.get_keyframes()
|
||||
start_pos = bisect_left(keyframes, start)
|
||||
end_pos = bisect_left(keyframes, end)
|
||||
return {
|
||||
'start': (
|
||||
keyframes[start_pos - 1] if start_pos > 0 else keyframes[start_pos],
|
||||
keyframes[start_pos],
|
||||
keyframes[start_pos + 1]
|
||||
),
|
||||
'end': (
|
||||
keyframes[end_pos - 2] if end_pos != (len(keyframes) - 1) else keyframes[end_pos - 1],
|
||||
keyframes[end_pos - 1] if end_pos != (len(keyframes) - 1) else keyframes[end_pos],
|
||||
keyframes[end_pos]
|
||||
)
|
||||
}
|
||||
|
||||
def encode(self, source, target, start, duration):
|
||||
info = self.get_info()
|
||||
if self.info['audio']:
|
||||
acodec = [
|
||||
'-c:a',
|
||||
self.info['audio'][0]['codec']
|
||||
]
|
||||
else:
|
||||
acodec = []
|
||||
vcodec = [
|
||||
'-c:v',
|
||||
self.info['video'][0]['codec']
|
||||
]
|
||||
|
||||
cmd = self.ffmpeg + [
|
||||
'-ss', '%f' % start,
|
||||
'-i', source,
|
||||
'-t', '%f' % duration,
|
||||
'-reset_timestamps', '1',
|
||||
] + acodec + [
|
||||
] + vcodec + [
|
||||
target
|
||||
]
|
||||
return cmd
|
||||
|
||||
def copy(self, source, target, start, duration):
|
||||
cmd = self.ffmpeg + [
|
||||
'-ss', '%f' % start,
|
||||
'-i', source,
|
||||
'-t', '%f' % duration,
|
||||
'-c:v', 'copy', '-c:a', 'copy',
|
||||
'-reset_timestamps', '1',
|
||||
target
|
||||
]
|
||||
return cmd
|
||||
|
||||
def join(self, segments, target):
|
||||
file_list = target + '.txt'
|
||||
with open(file_list, 'w') as fd:
|
||||
for segment in segments:
|
||||
fd.write('file %s\n' % segment)
|
||||
if self.subtitles:
|
||||
subtitles = [
|
||||
'-i', self.subtitles_output,
|
||||
'-c:s', 'mov_text'
|
||||
]
|
||||
else:
|
||||
subtitles = []
|
||||
cmd = self.ffmpeg + [
|
||||
'-f', 'concat', '-safe', '0', '-i', file_list,
|
||||
] + subtitles + [
|
||||
'-c:v', 'copy', '-c:a', 'copy',
|
||||
'-reset_timestamps', '1',
|
||||
target
|
||||
]
|
||||
files = [file_list]
|
||||
if self.subtitles:
|
||||
files.append(self.subtitles_output)
|
||||
return cmd, files
|
||||
|
||||
|
|
@ -602,27 +602,39 @@ def timeline_strip(item, cuts, info, prefix):
|
|||
timeline_image.save(timeline_file)
|
||||
|
||||
|
||||
def chop(video, start, end):
|
||||
def chop(video, start, end, subtitles=None):
|
||||
t = end - start
|
||||
tmp = tempfile.mkdtemp()
|
||||
ext = os.path.splitext(video)[1]
|
||||
choped_video = '%s/tmp%s' % (tmp, ext)
|
||||
cmd = [
|
||||
settings.FFMPEG,
|
||||
'-y',
|
||||
'-i', video,
|
||||
'-ss', '%.3f' % start,
|
||||
'-t', '%.3f' % t,
|
||||
'-c:v', 'copy',
|
||||
'-c:a', 'copy',
|
||||
'-f', ext[1:],
|
||||
choped_video
|
||||
]
|
||||
p = subprocess.Popen(cmd, stdin=subprocess.PIPE,
|
||||
stdout=open('/dev/null', 'w'),
|
||||
stderr=open('/dev/null', 'w'),
|
||||
close_fds=True)
|
||||
p.wait()
|
||||
if subtitles and ext == '.mp4':
|
||||
subtitles_f = choped_video + '.full.srt'
|
||||
with open(subtitles_f, 'wb') as fd:
|
||||
fd.write(subtitles)
|
||||
else:
|
||||
subtitles_f = None
|
||||
if ext == '.mp4':
|
||||
from .chop import Chop
|
||||
Chop(video, choped_video, start, end, subtitles_f)
|
||||
if subtitles_f:
|
||||
os.unlink(subtitles_f)
|
||||
else:
|
||||
cmd = [
|
||||
settings.FFMPEG,
|
||||
'-y',
|
||||
'-i', video,
|
||||
'-ss', '%.3f' % start,
|
||||
'-t', '%.3f' % t,
|
||||
'-c:v', 'copy',
|
||||
'-c:a', 'copy',
|
||||
'-f', ext[1:],
|
||||
choped_video
|
||||
]
|
||||
p = subprocess.Popen(cmd, stdin=subprocess.PIPE,
|
||||
stdout=open('/dev/null', 'w'),
|
||||
stderr=open('/dev/null', 'w'),
|
||||
close_fds=True)
|
||||
p.wait()
|
||||
f = open(choped_video, 'rb')
|
||||
os.unlink(choped_video)
|
||||
os.rmdir(tmp)
|
||||
|
|
|
|||
|
|
@ -1044,7 +1044,15 @@ def video(request, id, resolution, format, index=None, track=None):
|
|||
|
||||
content_type = mimetypes.guess_type(path)[0]
|
||||
if len(t) == 2 and t[1] > t[0] and duration >= t[1]:
|
||||
response = HttpResponse(extract.chop(path, t[0], t[1]), content_type=content_type)
|
||||
# FIXME: could be multilingual here
|
||||
subtitles = utils.get_by_key(settings.CONFIG['layers'], 'isSubtitles', True)
|
||||
if subtitles:
|
||||
srt = item.srt(subtitles['id'], encoder=ox.srt)
|
||||
if len(srt) < 4:
|
||||
srt = None
|
||||
else:
|
||||
srt = None
|
||||
response = HttpResponse(extract.chop(path, t[0], t[1], subtitles=srt), content_type=content_type)
|
||||
filename = u"Clip of %s - %s-%s - %s %s%s" % (
|
||||
item.get('title'),
|
||||
ox.format_duration(t[0] * 1000).replace(':', '.')[:-4],
|
||||
|
|
|
|||
Loading…
Reference in New Issue