[FFmpeg-user] Duplicate frame when use seek option.

tim nicholson nichot20 at yahoo.com
Thu Sep 25 08:47:06 CEST 2014

On 23/09/14 19:47, Carl Eugen Hoyos wrote:
> César Sepúlveda <csepulveda <at> mediastre.am> writes:
>> $ ffmpeg -y -i gop_10.mp4 -acodec aac -strict -2
>> -vcodec libx264 -ss 5.00500 -vframes 60 -level 31 
>> -profile:v baseline 1.mp4
> You may try -vsync 0 or another container because 
> our mov muxer tends to duplicate the first frame 
> to produce cfr output.

Interesting. I have just been trying to pin down a similar issue. I have
also found using vframes problematical in that you tend to get
inconsistent mvhd and mdhd atoms unless you also use -shortest, while
using -t is fine.

Trying to understand why it should need to duplicate a frame to get cfr
though. Sounds like it could do with a patch.

> Carl Eugen
> [...]

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