[FFmpeg-devel] [PATCH] avcodec/cuviddec: Add handling HDR10+ sidedata on cuviddec.

[Timo Rothenpieler]

On 20/09/2024 04:08, 김윤주 wrote:
> Does native decoder refer to hevc (hevcdec.c)?
> I tried using hevc and in environments with low CPU performance, hevc_cuvid
> was much faster.
> So, I used hevc_cuvid for decoding but encountered an issue where HDR10+
> sidedata did not exist.
> That's why I wrote this patch.

You did turn on hwaccel, right?
I don't see why the native decoder would be much slower at parsing then 
nvidias parsers.

> I thought that the original content's sidedata should be preserved even
> after decoding regardless of which decoder is used.
> And I thought hevc_cuvid was the only way to get Nvidia hwaccel support.
> If I'm mistaken about anything, please let me know.

It's just that the cuviddec decoder is more of a relic, from before the 
native hwaccel existed.
The only reason it's not straight up deprecated is that it's sometimes 
nice to have a "second opinion" when issues crop up, and there are a few 
specific features like hardware-deinterlacing that can't be exposed via 
the native hwaccel.

But I'd normally not like to expand it even further and add complex and 
large features to it. Whenever possible, the native nvdec hwaccel should 
be used.

> Also, is it correct to respond to your comments like this?
> It seems quite different from the format you sent.

Top-posting isn't exactly liked here, though I don't really have a 
strong opinion on it.

> Apologies, as I'm still relatively new to the FFmpeg community and have a
> lot to learn.
> Any additional guidance would be greatly appreciated.
> 
> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of Timo
> Rothenpieler
> Sent: Friday, September 20, 2024 4:48 AM
> To: ffmpeg-devel at ffmpeg.org
> Subject: Re: [FFmpeg-devel] [PATCH] avcodec/cuviddec: Add handling HDR10+
> sidedata on cuviddec.
> 
> On 19.09.2024 06:43, yoonjoo wrote:
>> Implemented decoding of NAL units and handling HDR10+ sidedata by
>> referring to hevcdec.
> 
> Why? Can't you just use the native decoder with nvdec hwaccel?
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