[FFmpeg-devel] [PATCH] Add VDA support to ffmpeg

compn tempn at twmi.rr.com
Mon Jul 23 22:02:07 CEST 2012

On Sat, 21 Jul 2012 18:11:35 +0200, Sebastien Zwickert wrote:
>On Jul 19, 2012, at 7:47 AM, Hendrik Leppkes wrote:
>> On Thu, Jul 19, 2012 at 1:08 AM, Xunzhen Quan <quanxunzhen at gmail.com> wrote:
>>> I think that HWAccels are just used to do some complex mathematical
>>> computing acceleration, but VDA is an all-in-one hardware acceleration
>>> api, which supply only four functions: create decoder, destroy decoder,
>>> decode and flush. So I think that it should be wrapped as a Decoder
>>> rather than a HWAccel. And if you think it makes code bload, I suggest
>>> to just remove the corresponding HWAccel sinceno one seems to be
>>> using it.
>> […]
>> and i've also been told that the VDA HWAccel does also work fine.
>> All of these you can see in use in for example VLC (including VDA,
>> according to j-b). They are also not doing "complex mathematical
>> computing", but high-level bitstream decoding. The codec feeds it full
>> frames, and not only some math tasks to do.
>Right. Here is a VLC build with VDA support enabled that links against the 
>current implementation of VDA HWAccel.
>Note that you should activate manually the use of video acceleration in VLC
>settings by enabling the Hardware decoding option (Show All -> Video decoders
>-> FFmpeg). 
>Some extra info are available on my wiki on github :
>So is the current implementation working fine ? Almost :) Indeed, the playback is
>flickering when VLC starts playing a movie with VDA and is stuttering  when we
>seek in the stream during about 1 second cause of the VDA decoder is running
>in asynchronous mode…
>And my bad, it is possible to use the decoder in synchronous mode and this fixes
>flickering and stuttering issues. Moreover, it brings a smaller, simpler and proper
>codebase. I'll provide patches in this way ASAP.
>The following link is a VLC build with VDA support enabled that links
>against the VDA HWAccel that runs VDA in synchronous mode.
>This build just works fine with VDA HWAccel.

so can this patch be applied until someone hacks up the proper way in
mplayer ? its not that much 'bloat' ...


More information about the ffmpeg-devel mailing list