[FFmpeg-devel] [PATCH 1/5] lavc : yami : add libyami decoder/encoder

[Chao Liu]

On Mon, Aug 15, 2016 at 6:00 PM, Jun Zhao <mypopydev at gmail.com> wrote:

>
>
> On 2016/8/16 1:48, Jean-Baptiste Kempf wrote:
> > On 15 Aug, Hendrik Leppkes wrote :
> >> > On Mon, Aug 15, 2016 at 10:22 AM, Jun Zhao <mypopydev at gmail.com>
> wrote:
> >>> > > add libyami decoder/encoder/vpp in ffmpeg, about build step,
> >>> > > please refer to the link: https://github.com/01org/
> ffmpeg_libyami/wiki/Build
> >>> > >
> >> >
> >> > We've had patches for yami before, and they were not applied because
> >> > many developers did not agree with adding more wrappers for the same
> >> > hardware decoders which we already support.
> >> > Please refer to the discussion in this thread:
> >> > https://ffmpeg.org/pipermail/ffmpeg-devel/2015-January/167388.html
> >> >
> >> > The concerns and reasons brought up there should not really have
> changed.
> > I still object very strongly against yami.
> >
> > It is a library that does not bring much that we could not do ourselves,
> > it duplicates a lot of our code, it is the wrong level of abstraction
> > for libavcodec, it is using a bad license and there is no guarantee of
> > maintainership in the future.
>
> I know the worry after read the above thread.For Intel GPU HW accelerate
> decode/encode,
> now have 3 options in ffmpeg:
>
> 1. ffmpeg and QSV (Media SDK)
> 2. ffmpeg vaapi hw accelerate decoder/native vaapi encoder
> 3. ffmpeg and libyami
>
Sorry for this little diversion: what are the differences between QSV and
vaapi?
My understanding is that QSV has better performance, while vaapi supports
more decoders / encoders. Is that correct?
It would be nice if there are some data showing the speed of these HW
accelerated decoders / encoders.

>
> And I know the guys prefer option 2 than 3, but I have a little question,
> what's the
> difference about ffmpeg/libyami and the other external codec library(e,g
> openh264,
> videotoolbox...)?
>
Is 2 available in ffmpeg today or is it sth. planned?

>
> As I know Intel have 3 full time Libyami developers, so no guarantee maybe
> is wrong.:)
>
> Tks.
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