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

[Ryan Patterson]

On Sat, Feb 15, 2025 at 2:24 PM Scott Theisen <scott.the.elm at gmail.com>
wrote:

> 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:
>
>> On Fri, Feb 14, 2025 at 1:44 PM James Abernathy <jfabernathy at gmail.com>
>> wrote:
>>
>>> On Fri, Feb 14, 2025 at 7:08 AM Ryan Patterson <ryan.goat at gmail.com>
>>> wrote:
>>>
>>>> On Thu, Feb 13, 2025 at 9:16 PM James Abernathy <jfabernathy at gmail.com>
>>>> wrote:
>>>>
>>>>> On Thu, Feb 13, 2025 at 9:04 PM James Abernathy <jfabernathy at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> On Thu, Feb 13, 2025 at 8:54 PM James Abernathy <
>>>>>> jfabernathy at gmail.com> wrote:
>>>>>>
>>>>>>> On Thu, Feb 13, 2025 at 8:27 PM Ryan Patterson <ryan.goat at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> 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 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
>

Hi Scott,

Yes, I'm sure the problem is the Debian Nvidia driver version being lower
than 550.  I'm the one who submitted
https://github.com/MythTV/mythtv/issues/1039

As stated under the bug report, I updated to Nvidia driver 570 with CUDA.
But NVDEC is not detected by mythfrontend.
_____________
Ryan Patterson
If you put the federal government in charge of the Sahara Desert, in five
years there'd be a shortage of sand. - Milton Friedman
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