#3956 closed defect (needs_more_info)
capturing with h264 codec with built-in hw c920 produce intermittent pause
| Reported by: | gtzen | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | undetermined |
| Version: | unspecified | Keywords: | h264 v4l2 |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
While using a logitech c920 build-in hw codec to capture the video from webcam, it produces slight random intermittent pause in the captured video (that makes look like frames jump from one to another)
How to reproduce:
% ffmpeg -report -s 1920x1080 -f v4l2 -vcodec h264 -i /dev/video0 -copyinkf -vcodec copy test_directly_processed_by_c920-another-attempt1.mp4
%cat ffmpeg-20140917-084550.log
ffmpeg started on 2014-09-17 at 08:45:50
Report written to "ffmpeg-20140917-084550.log"
Command line:
ffmpeg -report -s 1920x1080 -f v4l2 -vcodec h264 -i /dev/video0 -vcodec copy test_directly_processed_by_c920-another-attempt1.mp4
ffmpeg version 2.4 Copyright (c) 2000-2014 the FFmpeg developers
built on Sep 15 2014 01:02:34 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
libavutil 54. 7.100 / 54. 7.100
libavcodec 56. 1.100 / 56. 1.100
libavformat 56. 4.101 / 56. 4.101
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 1.100 / 5. 1.100
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 0.100 / 53. 0.100
Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-s' ... matched as option 's' (set frame size (WxH or abbreviation)) with argument '1920x1080'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'v4l2'.
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'h264'.
Reading option '-i' ... matched as input file with argument '/dev/video0'.
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'copy'.
Reading option 'test_directly_processed_by_c920-another-attempt1.mp4' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file /dev/video0.
Applying option s (set frame size (WxH or abbreviation)) with argument 1920x1080.
Applying option f (force format) with argument v4l2.
Applying option vcodec (force video codec ('copy' to copy stream)) with argument h264.
Successfully parsed a group of options.
Opening an input file: /dev/video0.
[video4linux2,v4l2 @ 0x305a4e0] fd:4 capabilities:84000001
[video4linux2,v4l2 @ 0x305a4e0] Current input_channel: 0, input_name: Camera 1, input_std: 0
[h264 @ 0x305ae00] Current profile doesn't provide more RBSP data in PPS, skipping
[video4linux2,v4l2 @ 0x305a4e0] All info found
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 5317.791377, bitrate: N/A
Stream #0:0, 8, 1/1000000: Video: h264 (Constrained Baseline), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], -4 kb/s, 24 fps, 24 tbr, 1000k tbn, 60 tbc
Successfully opened the file.
Parsing a group of options: output file test_directly_processed_by_c920-another-attempt1.mp4.
Applying option vcodec (force video codec ('copy' to copy stream)) with argument copy.
Successfully parsed a group of options.
Opening an output file: test_directly_processed_by_c920-another-attempt1.mp4.
Successfully opened the file.
Output #0, mp4, to 'test_directly_processed_by_c920-another-attempt1.mp4':
Metadata:
encoder : Lavf56.4.101
Stream #0:0, 0, 1/1000000: Video: h264 ([33][0][0][0] / 0x0021), yuvj420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, -4 kb/s, 24 fps, 1000k tbn, 1000k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 0, current: -214627; changing to 1. This may result in incorrect timestamps in the output file.
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 1, current: -174633; changing to 2. This may result in incorrect timestamps in the output file.
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 2, current: -130641; changing to 3. This may result in incorrect timestamps in the output file.
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 3, current: -90647; changing to 4. This may result in incorrect timestamps in the output file.
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 4, current: -50653; changing to 5. This may result in incorrect timestamps in the output file.
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 5, current: -6660; changing to 6. This may result in incorrect timestamps in the output file.
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 449296, current: 310695; changing to 449297. This may result in incorrect timestamps in the output file.
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 449297, current: 347879; changing to 449298. This may result in incorrect timestamps in the output file.
frame= 20 fps=0.0 q=-1.0 size= 349kB time=00:00:00.44 bitrate=6370.4kbits/s
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 449298, current: 384674; changing to 449299. This may result in incorrect timestamps in the output file.
[mp4 @ 0x3115fe0] Non-monotonous DTS in output stream 0:0; previous: 449299, current: 421670; changing to 449300. This may result in incorrect timestamps in the output file.
frame= 33 fps= 32 q=-1.0 size= 542kB time=00:00:01.07 bitrate=4143.2kbits/s
frame= 48 fps= 31 q=-1.0 size= 740kB time=00:00:01.48 bitrate=4072.7kbits/s
frame= 63 fps= 31 q=-1.0 size= 934kB time=00:00:01.94 bitrate=3926.7kbits/s
frame= 79 fps= 31 q=-1.0 size= 1137kB time=00:00:02.42 bitrate=3847.8kbits/s
frame= 94 fps= 31 q=-1.0 size= 1323kB time=00:00:03.14 bitrate=3442.6kbits/s
frame= 109 fps= 31 q=-1.0 size= 1497kB time=00:00:03.55 bitrate=3449.2kbits/s
frame= 124 fps= 30 q=-1.0 size= 1683kB time=00:00:04.00 bitrate=3443.3kbits/s
frame= 140 fps= 31 q=-1.0 size= 1878kB time=00:00:04.47 bitrate=3435.2kbits/s
frame= 155 fps= 30 q=-1.0 size= 2071kB time=00:00:04.92 bitrate=3448.2kbits/s
frame= 170 fps= 30 q=-1.0 size= 2259kB time=00:00:05.62 bitrate=3287.6kbits/s
frame= 185 fps= 30 q=-1.0 size= 2440kB time=00:00:06.06 bitrate=3296.8kbits/s
frame= 201 fps= 30 q=-1.0 size= 2632kB time=00:00:06.53 bitrate=3298.7kbits/s
frame= 216 fps= 30 q=-1.0 size= 2809kB time=00:00:06.97 bitrate=3297.9kbits/s
frame= 231 fps= 30 q=-1.0 size= 2993kB time=00:00:07.69 bitrate=3184.7kbits/s
frame= 246 fps= 30 q=-1.0 size= 3173kB time=00:00:08.10 bitrate=3206.4kbits/s
frame= 262 fps= 30 q=-1.0 size= 3370kB time=00:00:08.59 bitrate=3213.1kbits/s
frame= 277 fps= 30 q=-1.0 size= 3549kB time=00:00:09.03 bitrate=3217.4kbits/s
frame= 292 fps= 30 q=-1.0 size= 3735kB time=00:00:09.47 bitrate=3227.6kbits/s
[NULL @ 0x305ae00] Current profile doesn't provide more RBSP data in PPS, skipping
frame= 307 fps= 30 q=-1.0 size= 3944kB time=00:00:10.17 bitrate=3174.2kbits/s
frame= 323 fps= 30 q=-1.0 size= 4140kB time=00:00:10.65 bitrate=3184.8kbits/s
frame= 338 fps= 30 q=-1.0 size= 4323kB time=00:00:11.09 bitrate=3192.8kbits/s
frame= 353 fps= 30 q=-1.0 size= 4507kB time=00:00:11.53 bitrate=3200.8kbits/s
frame= 369 fps= 30 q=-1.0 size= 4701kB time=00:00:12.27 bitrate=3136.5kbits/s
frame= 384 fps= 30 q=-1.0 size= 4886kB time=00:00:12.70 bitrate=3149.6kbits/s
frame= 399 fps= 30 q=-1.0 size= 5066kB time=00:00:13.15 bitrate=3156.1kbits/s
frame= 414 fps= 30 q=-1.0 size= 5250kB time=00:00:13.59 bitrate=3163.7kbits/s
frame= 430 fps= 30 q=-1.0 size= 5446kB time=00:00:14.06 bitrate=3171.8kbits/s
frame= 445 fps= 30 q=-1.0 size= 5631kB time=00:00:14.75 bitrate=3125.5kbits/s
frame= 460 fps= 30 q=-1.0 size= 5813kB time=00:00:15.20 bitrate=3131.0kbits/s
frame= 475 fps= 30 q=-1.0 size= 5995kB time=00:00:15.65 bitrate=3138.1kbits/s
frame= 491 fps= 30 q=-1.0 size= 6191kB time=00:00:16.12 bitrate=3145.8kbits/s
frame= 506 fps= 30 q=-1.0 size= 6376kB time=00:00:16.82 bitrate=3104.0kbits/s
frame= 521 fps= 30 q=-1.0 size= 6560kB time=00:00:17.26 bitrate=3112.5kbits/s
frame= 536 fps= 30 q=-1.0 size= 6742kB time=00:00:17.70 bitrate=3118.7kbits/s
frame= 552 fps= 30 q=-1.0 size= 6939kB time=00:00:18.18 bitrate=3126.6kbits/s
frame= 567 fps= 30 q=-1.0 size= 7122kB time=00:00:18.90 bitrate=3086.8kbits/s
frame= 582 fps= 30 q=-1.0 size= 7304kB time=00:00:19.30 bitrate=3098.6kbits/s
frame= 597 fps= 30 q=-1.0 size= 7487kB time=00:00:19.76 bitrate=3103.0kbits/s
[NULL @ 0x305ae00] Current profile doesn't provide more RBSP data in PPS, skipping
frame= 613 fps= 30 q=-1.0 size= 7708kB time=00:00:20.23 bitrate=3119.9kbits/s
frame= 628 fps= 30 q=-1.0 size= 7868kB time=00:00:20.68 bitrate=3116.8kbits/s
frame= 643 fps= 30 q=-1.0 size= 8052kB time=00:00:21.38 bitrate=3084.9kbits/s
frame= 659 fps= 30 q=-1.0 size= 8246kB time=00:00:21.85 bitrate=3091.2kbits/s
frame= 674 fps= 30 q=-1.0 size= 8429kB time=00:00:22.29 bitrate=3097.0kbits/s
frame= 689 fps= 30 q=-1.0 size= 8612kB time=00:00:22.73 bitrate=3102.7kbits/s
frame= 704 fps= 30 q=-1.0 size= 8796kB time=00:00:23.45 bitrate=3072.0kbits/s
frame= 720 fps= 30 q=-1.0 size= 8991kB time=00:00:23.91 bitrate=3080.6kbits/s
frame= 735 fps= 30 q=-1.0 size= 9174kB time=00:00:24.35 bitrate=3086.1kbits/s
frame= 750 fps= 30 q=-1.0 size= 9359kB time=00:00:24.79 bitrate=3091.8kbits/s
frame= 765 fps= 30 q=-1.0 size= 9541kB time=00:00:25.23 bitrate=3096.9kbits/s
frame= 781 fps= 30 q=-1.0 size= 9737kB time=00:00:25.96 bitrate=3072.4kbits/s
frame= 796 fps= 30 q=-1.0 size= 9920kB time=00:00:26.41 bitrate=3077.0kbits/s
frame= 811 fps= 30 q=-1.0 size= 10103kB time=00:00:26.85 bitrate=3082.0kbits/s
frame= 826 fps= 30 q=-1.0 size= 10286kB time=00:00:27.29 bitrate=3087.0kbits/s
frame= 842 fps= 30 q=-1.0 size= 10481kB time=00:00:28.03 bitrate=3062.7kbits/s
frame= 857 fps= 30 q=-1.0 size= 10666kB time=00:00:28.46 bitrate=3069.3kbits/s
frame= 872 fps= 30 q=-1.0 size= 10848kB time=00:00:28.91 bitrate=3073.8kbits/s
frame= 887 fps= 30 q=-1.0 size= 11032kB time=00:00:29.35 bitrate=3078.8kbits/s
[NULL @ 0x305ae00] Current profile doesn't provide more RBSP data in PPS, skipping
frame= 903 fps= 30 q=-1.0 size= 11257kB time=00:00:30.10 bitrate=3062.6kbits/s
frame= 918 fps= 30 q=-1.0 size= 11432kB time=00:00:30.51 bitrate=3069.1kbits/s
frame= 933 fps= 30 q=-1.0 size= 11593kB time=00:00:30.96 bitrate=3066.6kbits/s
frame= 949 fps= 30 q=-1.0 size= 11789kB time=00:00:31.44 bitrate=3071.7kbits/s
frame= 964 fps= 30 q=-1.0 size= 11972kB time=00:00:31.88 bitrate=3075.8kbits/s
frame= 967 fps= 30 q=-1.0 Lsize= 12021kB time=00:00:31.97 bitrate=3079.8kbits/s
video:12008kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.101403%
Input file #0 (/dev/video0):
Input stream #0:0 (video): 967 packets read (12296531 bytes);
Total: 967 packets (12296531 bytes) demuxed
Output file #0 (test_directly_processed_by_c920-another-attempt1.mp4):
Output stream #0:0 (video): 967 packets muxed (12296531 bytes);
Total: 967 packets (12296531 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x31153a0] Statistics: 34 seeks, 997 writeouts
Any input to overcome this? Thanks!
Change History (5)
comment:1 by , 10 years ago
| Component: | ffmpeg → undetermined |
|---|---|
| Keywords: | h264 added; ffmpeg c920 copyinkf removed |
| Priority: | critical → normal |
comment:2 by , 10 years ago
Removal of -copyinkf does not make difference. Tried already.
However if I process the same video again in avidemux copying the video codec and save to the same format, the video becomes smooth, fyi!
Version 0, edited 10 years ago by (next)
comment:3 by , 10 years ago
| Keywords: | v4l2 added |
|---|
comment:4 by , 10 years ago
| Resolution: | → needs_more_info |
|---|---|
| Status: | new → closed |
According to ribasushi (IRC / #ffmpeg), this might be due to a bug in the kernel: http://sourceforge.net/p/linux-uvc/mailman/message/33164469/
Maybe there is something to improve in our API usage, but it's apparently a regression in the Linux kernel since it's not supposed to break userland, so I'm closing the ticket for now. Feel free to re-open if you don't think it's justified.
comment:5 by , 9 years ago
14:10 <ribasushi> ubitux: in case you want to add more info to https://trac.ffmpeg.org/ticket/3956 14:10 <ribasushi> ubitux: final resolution is this (patch referenced within at [4]): https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=794327
Note:
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Please test current FFmpeg git head.
Does removing
-copyinkfmake a difference? If not, please remove it.