[FFmpeg-devel] Added - HW accelerated H.264 and HEVC encoding for AMD GPUs based on AMF SDK

[Carl Eugen Hoyos]

2017-10-29 15:54 GMT+01:00 Mironov, Mikhail <Mikhail.Mironov at amd.com>:
>> -----Original Message-----
>> From: ffmpeg-devel [mailto:ffmpeg-devel-bounces at ffmpeg.org] On Behalf
>> Of Carl Eugen Hoyos
>> Sent: October 28, 2017 3:19 PM
>> To: FFmpeg development discussions and patches <ffmpeg-
>> devel at ffmpeg.org>
>> Subject: Re: [FFmpeg-devel] Added - HW accelerated H.264 and HEVC
>> encoding for AMD GPUs based on AMF SDK
>>
>> 2017-10-27 20:09 GMT+02:00 mmironov <mikhail.mironov at amd.com>:
>> > +const enum AVPixelFormat ff_amf_pix_fmts[] = {
>> > +    AV_PIX_FMT_NV12,
>>
>> > +    AV_PIX_FMT_BGRA,
>> > +    AV_PIX_FMT_ARGB,
>> > +    AV_PIX_FMT_RGBA,
>>
>> This is wrong, your encoders do not convert transparency information, there
>> are 32 rgb formats without alpha channel.

> In addition, the encoder has built-in shader-based color converter. It can
> accept BGRA and RGBA formats and convert them into NV12

Yes, I understood.

> dropping alpha channel.

Which is why using AV_PIX_FMT_BGRA is wrong, use AV_PIX_FMT_BGR0
(and friends).

Carl Eugen