[FFmpeg-user] problems with IPB Frames

[Carl Eugen Hoyos]

Guido Holz <guido <at> sportograf.com> writes:

> ffmpeg.exe -ss 00:00:01.0 -i 00005.MTS  -t 00:00:15.0 -an -y tmp.mp4 ;
> ffmpeg -y -i tmp.mp4 -ss 00:00:10.0 -t 00:00:05.0 -vf yadif=1 
> -r 25 -f x264 out.mp4 ;

> ffmpeg.exe -i out.mp4 -c copy -bsf:v h264_mp4toannexb -y out.ts
> ffmpeg -i "concat:out.ts|out.ts" -c copy -bsf:a aac_adtstoasc 
> -y finish.mp4

Why don't you concat the mp4 files with one of the 
other concat mechanisms?
http://ffmpeg.org/ffmpeg-filters.html#concat
http://ffmpeg.org/ffmpeg-formats.html#concat-1

As said, if you are able to remux a h264 stream 
so that the output file does not start with an 
I-frame, please provide your command line and 
a short input sample, this sounds like an unexpected 
(and unknown) bug to me!

Carl Eugen