[FFmpeg-user] concat images to h.264 movie not working

[Marton Balint]

On Tue, 8 Dec 2015, Moritz Barsnick wrote:

> On Mon, Dec 07, 2015 at 08:17:06 -0800, Roger Allen wrote:
>> I included a pointer at the end of the email.  I regret that was not more
>> obvious to you.  Please see
>> https://gist.github.com/rogerallen/426203d3a580898bd864
>
> Apparently, the concat demuxer assigns DTS and PTS values to each
> frame. For some peculiar reason, these alternate between 0 and
> AV_NOPTS_VALUE:
>
> (grep extract of loglevel debug - "ffprobe -show_frames" gives the same
> info essentially:)
>
> [concat @ 0xac22900] file:140 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:0 pts_time:0 dts:0 dts_time:0
> [concat @ 0xac22900] file:141 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:-9223372036854 pts_time:-3.68935e+11 dts:-9223372036854 dts_time:-3.68935e+11
> [concat @ 0xac22900] file:142 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:0 pts_time:0 dts:0 dts_time:0
> [concat @ 0xac22900] file:143 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:-9223372036854 pts_time:-3.68935e+11 dts:-9223372036854 dts_time:-3.68935e+11
> [concat @ 0xac22900] file:144 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:0 pts_time:0 dts:0 dts_time:0
> [concat @ 0xac22900] file:145 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:-9223372036854 pts_time:-3.68935e+11 dts:-9223372036854 dts_time:-3.68935e+11
> [concat @ 0xac22900] file:146 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:0 pts_time:0 dts:0 dts_time:0
> [concat @ 0xac22900] file:147 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:-9223372036854 pts_time:-3.68935e+11 dts:-9223372036854 dts_time:-3.68935e+11
> [concat @ 0xac22900] file:148 stream:0 pts:0 pts_time:0 dts:0 dts_time:0 -> pts:0 pts_time:0 dts:0 dts_time:0
>
> (I had made a 150 image concat input file instead of one with only 15
> images.)

Is this a regression?

Does this work OK if duration is specified in the concat file for each 
file?

I have a feeling that the concat demuxer never worked well with static 
images and unknown duration.

Regards,
Marton