[FFmpeg-devel] [FFmpeg-cvslog] avcodec/vdpau: Enable HEVC support for working Nvidia driver versions

[Carl Eugen Hoyos]

2019-02-03 22:09 GMT+01:00, Dominik 'Rathann' Mierzejewski
<dominik at greysector.net>:
> On Sunday, 27 January 2019 at 19:48, Carl Eugen Hoyos wrote:
>> 2019-01-27 19:43 GMT+01:00, Dominik 'Rathann' Mierzejewski
>> <dominik at greysector.net>:
>> > On Sunday, 27 January 2019 at 19:29, Carl Eugen Hoyos wrote:
>> >> 2019-01-27 19:06 GMT+01:00, Dominik 'Rathann' Mierzejewski
>> >> <dominik at greysector.net>:
>> >> > Hello,
>> >> >
>> >> > On Wednesday, 31 October 2018 at 03:44, ManojGuptaBonda wrote:
>> >> >> ffmpeg | branch: master | ManojGuptaBonda <mbonda at nvidia.com> | Mon
>> >> >> Oct
>> >> >> 29
>> >> >> 13:57:54 2018 +0530| [4a6d5f3cadaabefe6c3548e575bb7e713997762f] |
>> >> >> committer: Philip Langdale
>> >> >>
>> >> >> avcodec/vdpau: Enable HEVC support for working Nvidia driver
>> >> >> versions
>> >> >>
>> >> >> The driver bugs that caused decoded HEVC content to have an
>> >> >> incorrect
>> >> >> memory layout have been fully fixed in the 410.xx driver release so
>> >> >> we can start exposing support.
>> >> >>
>> >> >> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4a6d5f3cadaabefe6c3548e575bb7e713997762f
>> >> >
>> >> > I have a user requesting a backport of this and
>> >> > 4a976200d7853588336005a394dd31d905f5caf6
>> >> > to 4.0 branch which we use in Fedora/RPM Fusion 29:
>> >> > https://bugzilla.rpmfusion.org/show_bug.cgi?id=5149
>> >>
>> >> Wouldn't a user who uses an outdated version of FFmpeg
>> >> typically also use an outdated Nvidia driver?
>> >
>> > No. Why would you say that? First, 4.0.x is not outdated from
>> > where I'm sitting and second, we've updated the packaged
>> > nVidia drivers in RPM Fusion for F29 to 415 already.
>>
>> Thank you for explaining, I misunderstood.
>>
>> Why are you updating Nvidia drivers but not FFmpeg?
>
> That would be a question to the package maintainer, not me. He's
> maintaining packages for all supported nVidia driver series, not just
> the latest, as far as I remember.
>
> As for updating FFmpeg, I consider it something akin to "libc" for all
> things multimedia, so any update should be considered very carefully.

I don't know anything about the development process of "libc"
but there is nothing about an FFmpeg release that makes it
better than the following one.

>> Do you expect that (current) 4.0 has less bugs
>> than the last 4.1 release?
>
> Not necessarily, but new features may come with new bugs, too.

Of course!
But there are many known bugs in FFmpeg 4.0 that are fixed in
4.1 (and some new features) so I don't see what the advantage
of using 4.0.

> Anyway, as James explained already, 4.1 is ABI and API
> compatible, so I'll consider the update. Thanks.

Given past experience, I hope you can recompile.

Carl Eugen