Hi All,
I am capturing mjpeg frames from my webcam connected to a bananapi, running
armbian. The resulting video file is choppy when played with mplayer and VLC,
and in the console I see the following messages. The CPU of the bananapi is
nowhere near 100%
cedric@bananapi:~/FFmpeg$ ./ffmpeg -f v4l2 -input_format mjpeg -s 1280x720 -i
/dev/video0 -c:v copy output.mkv
ffmpeg version N-86245-gcd67ff8 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 20160609
configuration: --prefix=/usr --enable-nonfree --enable-gpl --enable-version3
--enable-vdpau --enable-libx264 --enable-libmp3lame --enable-libpulse
--enable-libv4l2
libavutil 55. 63.100 / 55. 63.100
libavcodec 57. 96.101 / 57. 96.101
libavformat 57. 72.101 / 57. 72.101
libavdevice 57. 7.100 / 57. 7.100
libavfilter 6. 90.100 / 6. 90.100
libswscale 4. 7.101 / 4. 7.101
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 1488.098843, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720,
30 fps, 30 tbr, 1000k tbn, 1000k tbc
File 'output.mkv' already exists. Overwrite ? [y/N] y
Output #0, matroska, to 'output.mkv':
Metadata:
encoder : Lavf57.72.101
Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc,
bt470bg/unknown/unknown), 1280x720, q=2-31, 30 fps, 30 tbr, 1k tbn, 1000k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[matroska @ 0x1c48860] Non-monotonous DTS in output stream 0:0; previous: 3109,
current: 2048; changing to 3109. This may result in incorrect timestamps in the
output file.
[matroska @ 0x1c48860] Non-monotonous DTS in output stream 0:0; previous: 3109,
current: 2080; changing to 3109. This may result in incorrect timestamps in the
output file.
Is there a way to prevent he above errors?
Is there a way to post-process the output file so VLC can play it?
Cheers,
Cedric
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