[Libav-user] vaapi h.264 decoding with libav

[Nikita Orlov]

Hi!

Could you promote any tutorial or start points to research this issue?


01.04.2015, 22:00, "wm4" <nfxjfg at googlemail.com>:
> On Wed, 01 Apr 2015 08:16:51 +0300
> Nikita Orlov <nikitos1550 at yandex.ru> wrote:
>>  Hello!
>>
>>  Thanks, I will try it.
>>  But, how to do such thing from c/c++ using libav?
>>
>>  I have found some instructions in the internet, but they are not clear.
>>
>>  One:
>>
>>  AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt)
>>  {
>>      AVHWAccel *hwaccel=NULL;
>>
>>      while((hwaccel= av_hwaccel_next(hwaccel))){
>>          if (   hwaccel->id      == codec_id
>>              && hwaccel->pix_fmt == pix_fmt)
>>              return hwaccel;
>>      }
>>      return NULL;
>>  }
>>
>>  I really don`t understand what to do with AVHWAccel...
>>
>>  Second
>>  find_codec_by_name and set name to h264_vaapi, but people say it doesn`t work.
>>
>>  P.S. I forgot to say, I use linux OS,
>
> No, h264_vaapi does not exist. Using the hwaccel API is rather
> complicated and requires you to set up the decoder yourself etc. I
> think the main reason for this is to reduce the amount of vaapi API
> code in ffmpeg and to give more control to the application using ffmpeg
> or something, but it makes it terrible complicated.
>
> You can look at mpv or vlc code to learn how to use it.
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Nikita Orlov
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