[FFmpeg-user] non-monotonous DTS in output stream

[cedric.dewijs at telfort.nl]

>----Origineel Bericht----
>Van : micaelsilva at gmail.com
>Datum : 17/05/2018 19:39
>Aan : ffmpeg-user at ffmpeg.org
>Onderwerp : Re: [FFmpeg-user] non-monotonous DTS in output stream
>
>On Thu, 17 May 2018, 09:57 cedric.dewijs at telfort.nl, <
>cedric.dewijs at telfort.nl> wrote:
>
>> 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 at 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
>>
>
>Have you tried...
>
>ffmpeg -fflags +igndts -f v4l2 (...)
>
>?
I have now, I still gets lots of Non-monotonous DTS errors. I am running this version of ffmpeg:
https://github.com/danielkucera/FFmpeg/tree/cedrus264

compiled in the following way:
./configure --prefix=/usr --enable-nonfree --enable-gpl --enable-version3 --enable-vdpau --enable-libx264 --enable-libmp3lame --enable-libpulse --enable-libv4l2

running with the following command line:
./ffmpeg -fflags +igndts -f v4l2 -input_format mjpeg -s 1280x720 -i /dev/video0 -c:v copy output.mkv


I am now compiling this version of ffmpeg, I hope this solves the problem. It will take a few hours.
https://ffmpeg.org/releases/ffmpeg-4.0.tar.xz

Cheers,
Cedric