NVENC vc1 transcode fails

[sarieri 0]

Hi,

 

Just found that NVENC cannot transcode vc1 format videos. I understand vc1 is a weird format and it uses only one core but this video is not playing at all.

The log keeps repeating lines like this: 09:42:15.457 [graph_1_aresample_in_0_0 @ 0xdddf80] [sWR @ 0xe22740] Failed to compensate for timestamp delta of 695.344036

ffmpeg-transcode-3f59230f-8a0f-402f-90b5-797df81b0ee1_1.txt

[Luke 42078]

Hi, did you try turning off hardware transcoding to see how that compares?

[sarieri 0]

Hi, did you try turning off hardware transcoding to see how that compares?

If I uncheck the vc1 of NVENC, the video plays with no problem. And emby console shows that it it using software to decode vc1 but NVENC to encode.

[Luke 42078]

Thanks. Did you follow our hardware acceleration setup guide?

https://support.emby.media/support/solutions/articles/44001160148-hardware-acceleration-overview

[sarieri 0]

Thanks. Did you follow our hardware acceleration setup guide?

https://support.emby.media/support/solutions/articles/44001160148-hardware-acceleration-overview

I'm pretty sure my setup is okay cuz every other format I tested so far has no problem.

[Luke 42078]

Did you follow the steps in the setup guide though? It's important that we know that before we proceed. Thanks.

[sarieri 0]

Did you follow the steps in the setup guide though? It's important that we know that before we proceed. Thanks.

Yes

[Luke 42078]

What Nvidia drivers are you running?

[sarieri 0]

What Nvidia drivers are you running?

Hi, I installed the unraid nvidia driver plugin which enable dockers to use nvidia driver. The driver version is 440.59. It's a 1650 super.

Edited May 6, 2020 by sarieri

[Luke 42078]

Ok, @@softworkz will take a look at this. Thanks.

[softworkz 5066]

@@sarieri - I'm afraid, but disabling VC1 decoding is the only solution at this time. In the future we will allow to switch the Nvidia hw decoding between CUVID and NVDEC (in ffmpeg terms). With CUVID, the video bitstream is decoded by Nvidia while NVDEC, it is parsed by ffmpeg. The latter way is more compatible with VC1 streams than Nvidia's parser, but CUVID has other advantages.

 

I can't give you an ETA for this, but it's in our backlog.

[Cthalpa 11]

This is an issue of the GPU not being compatible.

Older cards such as the k2000 etc are very restricted in these terms.

Please read the Nvidia nvenc list

[softworkz 5066]

On 5/24/2020 at 2:00 PM, Cthalpa said:

This is an issue of the GPU not being compatible.

This is incorrect. He has a GTX 1650. I have already explained in post #11 why it's failing.