[FFmpeg-user] Accurate Seeking with Multiple Parameters
hazarahub at gmail.com
Wed Mar 13 23:02:57 CET 2013
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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
> 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
> -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
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
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