[FFmpeg-devel] [PATCH 2/2] ffmpeg: Set default output format for dummy hwaccels

wm4 nfxjfg at googlemail.com
Mon Jun 26 10:50:12 EEST 2017

On Sun, 25 Jun 2017 14:27:06 -0700
Philip Langdale <philipl at overt.org> wrote:

> Dummy hwaccels, of which cuvid is the best example, behave differently
> from real hwaccels. In the past, one of these behaviours was that
> selecting the hwaccel would automatically cause the decoder (and
> remember it's a dedicated decoder) to use the native hardware output
> format.
> This meant that transcoding command lines would pass frames through
> device memory automatically once the right hwaccel and decoder/encoder
> were selected.
> With the generic hwaccel code path, dummy decoders end up following
> the 'real' hwaccel path where the output format defaults to a software
> format.
> To avoid users facing an unexpected change in behaviour, we now
> indicate whether an hwaccel is a dummy, and if it is, we set the
> default output format appropriately.
> To make this process easier, I updated ffmpeg to pass the HWAccel
> struct to the init() call so that we know which decoder we are
> dealing with.
> Signed-off-by: Philip Langdale <philipl at overt.org>
> ---

Doesn't this still mean hwaccels will push sw frames to filters, but
cuvid pushes hw frames? I thought we were trying to get rid of this

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