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How to add "anullsrc" to a video stream prior to concatenation.
See original GitHub issueI am trying to convert DVD (VOB) files into an MP4. The first 2 files, don’t have an audio track.
What is the proper syntax for adding an “anullsrc” audio track to video streams that do not have one, prior to concatenation?
ffmpeg command generate:
ffmpeg -i /Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VIDEO_TS.VOB -i /Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_0.VOB -i /Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_1.VOB -i /Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_2.VOB -i /Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_3.VOB -i /Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_4.VOB -i /Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_02_0.VOB -i /Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_02_1.VOB -filter_complex [0:a]nullsrc=r=480000[s0];[0:v][s0]concat=n=2[s1];[1:a]nullsrc=r=480000[s2];[1:v][s2]concat=n=2[s3];[s1][s3][2][3][4][5][6][7]concat=n=8[s4] -map [s4] /tmp/test.mp4
import os
import ffmpeg
global_args = {
'vcodec' : 'h264_videotoolbox',
'acodec' : 'aac',
'vb' : '7750k',
'ab' : '192k',
}
concat_args = {
'v' : 1,
'a' : 1
}
input_args = {
}
nullsrc = {
'filter_name' : 'nullsrc',
'r' : 480000
}
# Path shorted for readability (DIRECTORY is set)
# python.ffmpeg set up this way for debugging purposes.
vob_stream = list()
file1 = (ffmpeg.input(DIRECTORY + '/VIDEO_TS/VIDEO_TS.VOB'))
file2 = (ffmpeg.input(DIRECTORY + '/VIDEO_TS/VTS_01_0.VOB'))
file3 = (ffmpeg.input(DIRECTORY + '/VIDEO_TS/VTS_01_1.VOB'))
file4 = (ffmpeg.input(DIRECTORY + '/VIDEO_TS/VTS_01_2.VOB'))
file5 = (ffmpeg.input(DIRECTORY + '/VIDEO_TS/VTS_01_3.VOB'))
file6 = (ffmpeg.input(DIRECTORY + '/VIDEO_TS/VTS_01_4.VOB'))
file7 = (ffmpeg.input(DIRECTORY + '/VIDEO_TS/VTS_02_0.VOB'))
file8 = (ffmpeg.input(DIRECTORY + '/VIDEO_TS/VTS_02_1.VOB'))
video1 = file1.video
audio1 = file1.audio.filter(**nullsrc)
media1 = ffmpeg.concat(video1,audio1)
video2 = file2.video
audio2 = file2.audio.filter(**nullsrc)
media2 = ffmpeg.concat(video2,audio2)
merged = ffmpeg.concat(media1,media2,file3,file4,file5,file6,file7,file8)
output = ffmpeg.output(merged,mp4_out)
output.run()
This produces the following errors.
Input #0, mpeg, from '/Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VIDEO_TS.VOB':
Duration: 00:00:00.03, start: 0.060000, bitrate: 1964 kb/s
Stream #0:0[0x1bf]: Data: dvd_nav_packet
Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, progressive), 720x480 [SAR 8:9 DAR 4:3], 9000 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc
Input #1, mpeg, from '/Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_0.VOB':
Duration: 00:00:00.11, start: 0.060000, bitrate: 10443 kb/s
Stream #1:0[0x1bf]: Data: dvd_nav_packet
Stream #1:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, progressive), 720x480 [SAR 8:9 DAR 4:3], 9000 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #1:2[0x20]: Subtitle: dvd_subtitle
Input #2, mpeg, from '/Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_1.VOB':
Duration: 00:17:42.16, start: 0.060000, bitrate: 8086 kb/s
Stream #2:0[0x1bf]: Data: dvd_nav_packet
Stream #2:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bottom first), 720x480 [SAR 8:9 DAR 4:3], 7758 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #2:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
[mpeg2video @ 0x7fe489829c00] Invalid frame dimensions 0x0.
Last message repeated 13 times
Input #3, mpeg, from '/Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_2.VOB':
Duration: 00:17:41.70, start: 1062.172000, bitrate: 8090 kb/s
Stream #3:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bottom first), 720x480 [SAR 8:9 DAR 4:3], 7758 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #3:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
Stream #3:2[0x1bf]: Data: dvd_nav_packet
[mpeg2video @ 0x7fe489027e00] Invalid frame dimensions 0x0.
Last message repeated 7 times
Input #4, mpeg, from '/Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_3.VOB':
Duration: 00:17:41.91, start: 2123.932000, bitrate: 8088 kb/s
Stream #4:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bottom first), 720x480 [SAR 8:9 DAR 4:3], 7758 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #4:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
Stream #4:2[0x1bf]: Data: dvd_nav_packet
[mpeg2video @ 0x7fe48d007c00] Invalid frame dimensions 0x0.
Last message repeated 13 times
Input #5, mpeg, from '/Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_01_4.VOB':
Duration: 00:04:08.42, start: 3185.788000, bitrate: 8088 kb/s
Stream #5:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bottom first), 720x480 [SAR 8:9 DAR 4:3], 7758 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #5:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
Stream #5:2[0x1bf]: Data: dvd_nav_packet
Input #6, mpeg, from '/Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_02_0.VOB':
Duration: 00:00:00.03, start: 0.060000, bitrate: 1964 kb/s
Stream #6:0[0x1bf]: Data: dvd_nav_packet
Stream #6:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, progressive), 720x480 [SAR 8:9 DAR 4:3], 9000 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc
Input #7, mpeg, from '/Volumes/My Passport/Project/DVD_Files/VIDEO_TS/VTS_02_1.VOB':
Duration: 00:00:32.38, start: 0.060000, bitrate: 8076 kb/s
Stream #7:0[0x1bf]: Data: dvd_nav_packet
Stream #7:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bottom first), 720x480 [SAR 8:9 DAR 4:3], 7758 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #7:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
[AVFilterGraph @ 0x7fe488d06900] Too many inputs specified for the "nullsrc" filter.
Issue Analytics
- State:
- Created 4 years ago
- Reactions:2
- Comments:5 (1 by maintainers)
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Hmm, yeah we really should get #62 mergeable since it’s a commonly requested feature. There are a few changes that are still needed on that branch, so I’ll bump up the priority of it in my TODO list and try to get to it soon 🙂
audio_cmd = 'anullsrc=r=16000:cl=mono:d={}'.format(duration)audio_stream = ffmpeg.input(audio_cmd, f='lavfi')I add
anullsrcin ffmpeg-python like above and works for me, in case anyone is still looking for solution to this in 2022