[mythtv-users] Mythtv v35 fails decode with Nvidia NVDEC

[Scott Theisen]

On 2/14/25 12:10, James Abernathy wrote:
>
>
> On Fri, Feb 14, 2025 at 8:32 AM Roland Ernst <rcrernst at gmail.com> wrote:
>
>
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>     On Fri, Feb 14, 2025 at 1:44 PM James Abernathy
>     <jfabernathy at gmail.com> wrote:
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>
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>         On Fri, Feb 14, 2025 at 7:08 AM Ryan Patterson
>         <ryan.goat at gmail.com> wrote:
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>             On Thu, Feb 13, 2025 at 9:16 PM James Abernathy
>             <jfabernathy at gmail.com> wrote:
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>                 On Thu, Feb 13, 2025 at 9:04 PM James Abernathy
>                 <jfabernathy at gmail.com> wrote:
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>                     On Thu, Feb 13, 2025 at 8:54 PM James Abernathy
>                     <jfabernathy at gmail.com> wrote:
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>                         On Thu, Feb 13, 2025 at 8:27 PM Ryan Patterson
>                         <ryan.goat at gmail.com> wrote:
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>                             I just upgraded to fixes/35 and it is not
>                             working correctly.  Nothing will play when
>                             set to use the Nvidia NVDEC video decoder.
>
>                             The error displayed says, "Video Frame
>                             Buffering Failed Too Many Times"
>
>                             I switched to VDPAU decoding and playback
>                             works.  But I need NVDEC for 4K content.
>
>                             _____________
>                             Ryan Patterson
>                             May the wings of liberty never lose a feather.
>
>
>                         What are you seeing? Any log errors?  I have a
>                         laptop with hybrid GFX. Nvidia and Intel, so I
>                         can launch mythfrontend with pure Nvidia or
>                         pure Intel. Since I've been told that using
>                         OpenGL only works best with the current
>                         software and average CPU.  That even applies
>                         to RPI 4. I'm on v35 on everything so I can
>                         test it.
>
>                         Jim A
>
>
>                     I did a quick test on my laptop and launched
>                     mythfrontend with dedicated GPU option. NVDEC
>                     would not even play for me. I switched to OpenGL
>                     High Quality and it played perfectly. Of course my
>                     laptop is pretty good. Intel© Core™ i7-10750H CPU
>                     @ 2.60GHz × 6.
>
>                     Jim A
>
>
>                 I switched my laptop to Nvidia GPU only and rebooted.
>                 I got the same error as you. However, using OpenGL
>                 High Quality was a perfect picture on the Nvidia..
>
>                 Jim A
>
>
>             Thanks for confirming you see the same issue.  Yes, other
>             decoders work (VDPAU, FFMPEG, etc.).  But my CPU is not
>             powerful enough for h.265 HEVC 4K decode.  That is why I
>             need Nvidia NVDEC.  Hopefully the issue is fixed soon.
>
>             -Ryan
>
>
>         You might want to open an issue on the github.com
>         <http://github.com> site for mythtv.
>
>
>     You can try to set up different playback profiles, see last thread in
>     http://lists.mythtv.org/pipermail/mythtv-users/2025-February/414942.html
>     mythfrontend: playback settings
>
>     Formats MPEG2VIDEO->VDPAU acceleration & OpenGL Hardware
>     Formats H264->VDPAU acceleration & OpenGL Hardware
>     Formats HEVC->NVIDIA NVDEC acceleration & OpenGL Hardware
>
>     Roland
>
>
> That setup worked for me but I can only test it on MPEG2 and H.264 m4v.
>
> Jim A

What Nvidia driver version do you have?

When I updated FFmpeg to 7.1, I had to update ffnvcodec (the headers 
FFmpeg uses for dynamically loading CUDA/NVDEC/NVENC), which increased 
the minimum driver version to 550.  There are other versions of 
ffnvcodec we could use with lower driver version requirements.  See 
https://github.com/MythTV/mythtv/pull/1040 if that is the issue.

The GitHub issue is at https://github.com/MythTV/mythtv/issues/1039

Regards,

Scott
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