[Libav-user] partial decoding of mp4 files

Sam Halliday sam.halliday at gmail.com
Thu May 18 22:13:02 EEST 2017

Thanks Carl,

Is that for the CLI? I was thinking more for the programmatic access,
where is the skip frame option there? Is the API still limited it what
it can obtain for motion vectors?

Best regards,

On 17 May 2017 at 12:54, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 2017-05-17 13:32 GMT+02:00 Sam Halliday <sam.halliday at gmail.com>:
>> Is there a way to get hold of low level information, i.e. partial
>> decodings, of an mp4 file? Since this is all I need for my analysis, I
>> hope it would be more efficient than decoding the entire video:
>> 1. key frames (skipping motion compensation frames) as
>> decoded images
> See the -skip_frame option.
> I believe motion vectors are produced as part of decoding and that
> cannot be optimized easily.
> Carl Eugen
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