[FFmpeg-user] Decode just I Frames in H264

[Aviv Hurvitz]

Thanks for your answer Carl.
-skip_frame works.

Too bad  "spatial subsampling" is hard  or impossible .


On Thu, Nov 30, 2017 at 2:22 PM, Carl Eugen Hoyos <ceffmpeg at gmail.com>
wrote:

> 2017-11-30 10:22 GMT+01:00 Aviv Hurvitz <aviv.hurvitz at gmail.com>:
> > I'd like to make a CPU-efficient computer vision application
> > based on a H264 stream.
> >
> > I have two ideas and wanted to get feedback on their feasibility:
> >
> > *Idea 1 - temporal subsampling*
>
> -skip_frame nointra
>
> Note that valid (decodable) H.264 streams without I-frames exist.
>
> [...]
>
> > *Idea 2 - spatial subsampling*
>
> -lowres 1
>
> Unfortunately, this does not work for H.264 (it works for mpeg1/2/4
> and jpeg/jpeg2000), implementing it is impossible (?) or at least
> non-trivial - patch welcome!
>
> Carl Eugen
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