[FFmpeg-user] Accurate Seeking with Multiple Parameters

[aziz nazari]

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On 13 March 2013 22:52, Fernando Irias Escher <fernandoiriase at gmail.com>wrote:

> Hello everyone,
>
> I'm trying to create a 2x2 grid video (like the one shown here
> http://ffmpeg.org/trac/ffmpeg/wiki/FilteringGuide#multipleinputoverlayin2x2grid),
> but I need to trim the first seconds of some of the videos to make them fit
> perfectly in the grid.
>
> This is the command I came up with for this task:
> ffmpeg -i 0.mov -ss 0.0  -i 1.mov -ss 5.0  -i 2.mov -ss 0.0 -i 3.mov -ss
> 5.0  -filter_complex
> "[0:0]pad=iw*2:ih*2[a];[a][1:0]overlay=w[x];[x][2:0]overlay=0:h[y];[y][3:0]overlay=w:h"
> -y -c:v libx264 -c:a copy grid.mp4
>
> I'm aware of how accurate seeking works for -ss parameter, the problem
> arises when you have multiple parameters; looks like only the fast seeking
> option is available for the multiple inputs.
>
> In the previous command what I want is to cut the first five seconds for
> input 1.mov and input 3.mov, instead, the first five seconds for input
> 2.mov are trimmed and the last -ss param gets ignored.
>
> I also tried using the sp parameter that you can set to the movie filter
> when trying to grab the inputs from inside the complex filter, but some
> digging shows that I'm loosing some frames for some videos, so my first
> guess (and correct me if I'm wrong) will be that it uses fast seeking as
> well instead of the accurate one.
>
> Any ideas on how I could achieve accurate seeking for multiple inputs in
> this scenario?
>
> Previous thanks to all of you.
>
> -----
> Fernando Irías Escher
> @FernandoEscher
>
>
>
>
>
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