>----Origineel Bericht----
>Van : [email protected]
>Datum : 18/05/2018 10:05
>Aan : [email protected]
>Onderwerp : Re: [FFmpeg-user] non-monotonous DTS in output stream
>
>2018-05-17 14:57 GMT+02:00, [email protected]
><[email protected]>:
>> 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.
>
>If the camera provides constant frame rate, you can use the mjpg container.
>
>Carl Eugen
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I Carl,
I've tried, but there are a lot of frames missing in the resulting video file.
I have captured the image of a stopwatch with my webcam, and I see the seconds
go way faster than they should. I used the official 4.0 version of the source:
ffmpeg-4.0$ ./ffmpeg -fflags +igndts -f v4l2 -input_format mjpeg -s 1280x720 -i
/dev/video0 -pix_fmt nv12 -c:v copy output.mjpeg
ffmpeg version 4.0 Copyright (c) 2000-2018 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 56. 14.100 / 56. 14.100
libavcodec 58. 18.100 / 58. 18.100
libavformat 58. 12.100 / 58. 12.100
libavdevice 58. 3.100 / 58. 3.100
libavfilter 7. 16.100 / 7. 16.100
libswscale 5. 1.100 / 5. 1.100
libswresample 3. 1.100 / 3. 1.100
libpostproc 55. 1.100 / 55. 1.100
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 71259.463599, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720,
30 fps, 30 tbr, 1000k tbn, 1000k tbc
Output #0, mjpeg, to 'output.mjpeg':
Metadata:
encoder : Lavf58.12.100
Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720,
q=2-31, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 16 fps=0.0 q=-1.0 size= 2048kB time=00:00:00.49
bitrate=33559.2kbitsframe= 31 fps= 31 q=-1.0 size= 4864kB time=00:00:00.99
bitrate=39854.6kbitsframe= 46 fps= 31 q=-1.0 size= 7680kB time=00:00:01.49
bitrate=41953.0kbitsframe= 61 fps= 30 q=-1.0 size= 10496kB time=00:00:01.99
bitrate=43001.2kbitsframe= 76 fps= 30 q=-1.0 size= 13312kB time=00:00:02.49
bitrate=43629.2kbitsframe= 91 fps= 30 q=-1.0 size= 16128kB time=00:00:02.99
bitrate=44049.9kbitsframe= 106 fps= 30 q=-1.0 size= 18944kB time=00:00:03.49
bitrate=44349.5kbitsframe= 121 fps= 30 q=-1.0 size= 21760kB time=00:00:03.99
bitrate=44575.2kbitsframe= 136 fps= 30 q=-1.0 size= 24576kB time=00:00:04.49
s/s speed=0.907x
video:381272kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.000000%
Exiting normally, received signal 2.
Cheers,
Cedric
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