[FFmpeg-trac] #692(undetermined:new): Audio is not in sync with video, webcam capturing
FFmpeg
trac at avcodec.org
Mon Nov 28 11:42:21 CET 2011
#692: Audio is not in sync with video, webcam capturing
-------------------------------------+-------------------------------------
Reporter: burek | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
-------------------------------------+-------------------------------------
Comment (by burek):
ok, the following examples all have the same issue:
(internal aac)
{{{
root at bla:~# ffmpeg -f video4linux2 -r 25 -s vga -i /dev/video0 -f alsa -ar
44100 -ac 1 -i front:CARD=U0x46d0x809,DEV=0 -isync -vcodec libx264 -preset
fast -crf 20 -acodec aac -ab 128k -strict experimental -f mpegts
udp://burek:10001
ffmpeg version N-35149-g3880b45, Copyright (c) 2000-2011 the FFmpeg
developers
built on Nov 25 2011 02:16:49 with gcc 4.6.2
configuration: --enable-static --enable-shared --enable-gpl --enable-
nonfree --enable-postproc --enable-libx264 --enable-libaacplus --enable-
libmp3lame --enable-libv4l2 --enable-libvo-aacenc --enable-version3
libavutil 51. 28. 0 / 51. 28. 0
libavcodec 53. 37. 0 / 53. 37. 0
libavformat 53. 21. 0 / 53. 21. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 49. 0 / 2. 49. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
[video4linux2,v4l2 @ 0x1857a20] Estimating duration from bitrate, this may
be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 168.168777, bitrate: 92160 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480,
92160 kb/s, 25 tbr, 1000k tbn, 25 tbc
[alsa @ 0x1858a00] Estimating duration from bitrate, this may be
inaccurate
Input #1, alsa, from 'front:CARD=U0x46d0x809,DEV=0':
Duration: N/A, start: 1322476404.313276, bitrate: N/A
Stream #1:0: Audio: pcm_s16le, 48000 Hz, 1 channels, s16, 768 kb/s
[buffer @ 0x185a180] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:0/1
sws_param:
[libx264 @ 0x1852580] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x1852580] profile High, level 3.0
[mpegts @ 0x1852040] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt
every 40 pkts
Output #0, mpegts, to 'udp://burek:10001':
Metadata:
encoder : Lavf53.21.0
Stream #0:0: Video: h264, yuv420p, 640x480, q=-1--1, 90k tbn, 25 tbc
Stream #0:1: Audio: aac, 48000 Hz, 1 channels, s16, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo -> libx264)
Stream #1:0 -> #0:1 (pcm_s16le -> aac)
Press [q] to stop, [?] for help
frame= 591 fps= 24 q=25.0 Lsize= 2990kB time=00:00:23.18
bitrate=1056.1kbits/s dup=358 drop=0
video:2355kB audio:325kB global headers:0kB muxing overhead 11.540911%
[libx264 @ 0x1852580] frame I:3 Avg QP:17.89 size: 26873
[libx264 @ 0x1852580] frame P:270 Avg QP:19.24 size: 7880
[libx264 @ 0x1852580] frame B:318 Avg QP:20.23 size: 640
[libx264 @ 0x1852580] consecutive B-frames: 26.4% 5.4% 0.5% 67.7%
[libx264 @ 0x1852580] mb I I16..4: 9.4% 64.8% 25.8%
[libx264 @ 0x1852580] mb P I16..4: 0.2% 1.4% 0.2% P16..4: 44.6% 23.2%
13.8% 0.0% 0.0% skip:16.5%
[libx264 @ 0x1852580] mb B I16..4: 1.5% 1.4% 0.0% B16..8: 11.1% 0.7%
0.0% direct: 9.1% skip:76.2% L0:54.1% L1:42.7% BI: 3.2%
[libx264 @ 0x1852580] 8x8 transform intra:59.9% inter:63.5%
[libx264 @ 0x1852580] coded y,uvDC,uvAC intra: 49.7% 95.9% 71.8% inter:
17.6% 37.4% 7.5%
[libx264 @ 0x1852580] i16 v,h,dc,p: 37% 8% 34% 21%
[libx264 @ 0x1852580] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 11% 37% 5% 5%
6% 6% 7% 6%
[libx264 @ 0x1852580] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 19% 13% 6% 7%
6% 8% 7% 8%
[libx264 @ 0x1852580] i8c dc,h,v,p: 60% 16% 16% 8%
[libx264 @ 0x1852580] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x1852580] ref P L0: 57.3% 42.7%
[libx264 @ 0x1852580] ref B L0: 95.4% 4.6%
[libx264 @ 0x1852580] ref B L1: 99.6% 0.4%
[libx264 @ 0x1852580] kb/s:816.20
}}}
(libmp3lame)
{{{
root at bla:~# ffmpeg -f video4linux2 -r 25 -s vga -i /dev/video0 -f alsa -ar
44100 -ac 1 -i front:CARD=U0x46d0x809,DEV=0 -isync -vcodec libx264 -preset
fast -crf 20 -acodec libmp3lame -ab 128k -f mpegts udp://burek:10001
ffmpeg version N-35149-g3880b45, Copyright (c) 2000-2011 the FFmpeg
developers
built on Nov 25 2011 02:16:49 with gcc 4.6.2
configuration: --enable-static --enable-shared --enable-gpl --enable-
nonfree --enable-postproc --enable-libx264 --enable-libaacplus --enable-
libmp3lame --enable-libv4l2 --enable-libvo-aacenc --enable-version3
libavutil 51. 28. 0 / 51. 28. 0
libavcodec 53. 37. 0 / 53. 37. 0
libavformat 53. 21. 0 / 53. 21. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 49. 0 / 2. 49. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
[video4linux2,v4l2 @ 0x1335a20] Estimating duration from bitrate, this may
be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 289.069699, bitrate: 92160 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480,
92160 kb/s, 25 tbr, 1000k tbn, 25 tbc
[alsa @ 0x1336a00] Estimating duration from bitrate, this may be
inaccurate
Input #1, alsa, from 'front:CARD=U0x46d0x809,DEV=0':
Duration: N/A, start: 1322476525.134211, bitrate: N/A
Stream #1:0: Audio: pcm_s16le, 48000 Hz, 1 channels, s16, 768 kb/s
[buffer @ 0x1383880] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:0/1
sws_param:
[libx264 @ 0x1330040] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x1330040] profile High, level 3.0
[mpegts @ 0x1338040] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt
every 40 pkts
Output #0, mpegts, to 'udp://burek:10001':
Metadata:
encoder : Lavf53.21.0
Stream #0:0: Video: h264, yuv420p, 640x480, q=-1--1, 90k tbn, 25 tbc
Stream #0:1: Audio: mp3, 48000 Hz, 1 channels, s16, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo -> libx264)
Stream #1:0 -> #0:1 (pcm_s16le -> libmp3lame)
Press [q] to stop, [?] for help
frame= 810 fps= 23 q=-1.0 Lsize= 4818kB time=00:00:32.32
bitrate=1221.1kbits/s dup=113 drop=0
video:3855kB audio:505kB global headers:0kB muxing overhead 10.485526%
[libx264 @ 0x1330040] frame I:4 Avg QP:18.06 size: 19483
[libx264 @ 0x1330040] frame P:479 Avg QP:19.86 size: 5369
[libx264 @ 0x1330040] frame B:327 Avg QP:21.23 size: 3970
[libx264 @ 0x1330040] consecutive B-frames: 19.8% 79.3% 0.0% 1.0%
[libx264 @ 0x1330040] mb I I16..4: 8.9% 76.3% 14.7%
[libx264 @ 0x1330040] mb P I16..4: 0.1% 0.6% 0.0% P16..4: 50.8% 18.6%
10.3% 0.0% 0.0% skip:19.7%
[libx264 @ 0x1330040] mb B I16..4: 14.4% 17.3% 0.0% B16..8: 13.3% 2.7%
0.0% direct:25.9% skip:26.4% L0:52.6% L1:38.8% BI: 8.6%
[libx264 @ 0x1330040] 8x8 transform intra:56.4% inter:76.0%
[libx264 @ 0x1330040] coded y,uvDC,uvAC intra: 36.8% 98.2% 78.0% inter:
25.0% 64.6% 11.5%
[libx264 @ 0x1330040] i16 v,h,dc,p: 42% 15% 30% 13%
[libx264 @ 0x1330040] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 13% 44% 4% 3%
4% 4% 4% 4%
[libx264 @ 0x1330040] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 20% 13% 7% 6%
5% 7% 6% 6%
[libx264 @ 0x1330040] i8c dc,h,v,p: 62% 19% 14% 5%
[libx264 @ 0x1330040] Weighted P-Frames: Y:0.8% UV:0.0%
[libx264 @ 0x1330040] ref P L0: 61.9% 38.1%
[libx264 @ 0x1330040] ref B L0: 53.5% 46.5%
[libx264 @ 0x1330040] ref B L1: 100.0% 0.0%
[libx264 @ 0x1330040] kb/s:974.78
}}}
(internal mp2)
{{{
root at bla:~# ffmpeg -f video4linux2 -r 25 -s vga -i /dev/video0 -f alsa -ar
44100 -ac 1 -i front:CARD=U0x46d0x809,DEV=0 -isync -vcodec libx264 -preset
fast -crf 20 -f mpegts udp://burek:10001
ffmpeg version N-35149-g3880b45, Copyright (c) 2000-2011 the FFmpeg
developers
built on Nov 25 2011 02:16:49 with gcc 4.6.2
configuration: --enable-static --enable-shared --enable-gpl --enable-
nonfree --enable-postproc --enable-libx264 --enable-libaacplus --enable-
libmp3lame --enable-libv4l2 --enable-libvo-aacenc --enable-version3
libavutil 51. 28. 0 / 51. 28. 0
libavcodec 53. 37. 0 / 53. 37. 0
libavformat 53. 21. 0 / 53. 21. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 49. 0 / 2. 49. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
[video4linux2,v4l2 @ 0xa58a20] Estimating duration from bitrate, this may
be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 409.621608, bitrate: 92160 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480,
92160 kb/s, 25 tbr, 1000k tbn, 25 tbc
[alsa @ 0xa59a00] Estimating duration from bitrate, this may be inaccurate
Input #1, alsa, from 'front:CARD=U0x46d0x809,DEV=0':
Duration: N/A, start: 1322476645.783991, bitrate: N/A
Stream #1:0: Audio: pcm_s16le, 48000 Hz, 1 channels, s16, 768 kb/s
[buffer @ 0xa6be60] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:0/1
sws_param:
[libx264 @ 0xa53040] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0xa53040] profile High, level 3.0
[mpegts @ 0xa5b040] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt
every 40 pkts
Output #0, mpegts, to 'udp://burek:10001':
Metadata:
encoder : Lavf53.21.0
Stream #0:0: Video: h264, yuv420p, 640x480, q=-1--1, 90k tbn, 25 tbc
Stream #0:1: Audio: mp2, 48000 Hz, 1 channels, s16, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo -> libx264)
Stream #1:0 -> #0:1 (pcm_s16le -> mp2)
Press [q] to stop, [?] for help
frame= 676 fps= 24 q=25.0 Lsize= 3291kB time=00:00:26.68
bitrate=1010.0kbits/s dup=409 drop=0
video:2539kB audio:417kB global headers:0kB muxing overhead 11.301029%
[libx264 @ 0xa53040] frame I:3 Avg QP:17.29 size: 28390
[libx264 @ 0xa53040] frame P:284 Avg QP:19.11 size: 7924
[libx264 @ 0xa53040] frame B:389 Avg QP:20.11 size: 680
[libx264 @ 0xa53040] consecutive B-frames: 22.6% 1.8% 0.4% 75.1%
[libx264 @ 0xa53040] mb I I16..4: 8.9% 65.5% 25.6%
[libx264 @ 0xa53040] mb P I16..4: 0.1% 1.0% 0.1% P16..4: 47.5% 24.7%
15.0% 0.0% 0.0% skip:11.5%
[libx264 @ 0xa53040] mb B I16..4: 1.5% 1.6% 0.0% B16..8: 11.7% 0.7%
0.0% direct: 9.8% skip:74.7% L0:55.8% L1:41.3% BI: 2.8%
[libx264 @ 0xa53040] 8x8 transform intra:58.3% inter:65.5%
[libx264 @ 0xa53040] coded y,uvDC,uvAC intra: 43.4% 95.6% 69.6% inter:
16.9% 38.2% 7.4%
[libx264 @ 0xa53040] i16 v,h,dc,p: 35% 9% 36% 20%
[libx264 @ 0xa53040] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 11% 44% 5% 4%
5% 4% 5% 6%
[libx264 @ 0xa53040] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 21% 14% 6% 6%
5% 8% 6% 8%
[libx264 @ 0xa53040] i8c dc,h,v,p: 63% 17% 14% 6%
[libx264 @ 0xa53040] Weighted P-Frames: Y:0.4% UV:0.0%
[libx264 @ 0xa53040] ref P L0: 52.2% 47.8%
[libx264 @ 0xa53040] ref B L0: 95.4% 4.6%
[libx264 @ 0xa53040] ref B L1: 99.6% 0.4%
[libx264 @ 0xa53040] kb/s:769.35
}}}
(the same problem occurs even without -isync)
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/692#comment:4>
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