HEVC decoding via VDPAU inside MythTV

[laasa]

Does anyone use HEVC decoding via VDPAU inside MythTV?

I am using
- Mythbuntu 16.04
- MythTV 0.28 synced to GIT
- Palit GeForce 1050Ti
- manual installed NVidia driver 375.26
- any VDPAU video profile.
Playing H264 and MPEG2 material works fine with HW acceleration.
HEVC material is not played. I got message box "Failed to initialize A/V Sync".
mplayer works fine (mplayer -vo vdpau -vc ffhevcvdpau <file>). Via top I can see that HEVC decoding really works.

In mythtvfrontend log (option: -v playback) I have found the error "VidOutVDPAU: Codec is not supported.".
In source file libs\libmythtv\videoout_vdpau.cpp the case of HEVC material is really missed.
When I add it
...
case kCodec_VC1_VDPAU:
vdp_decoder_profile = VDP_DECODER_PROFILE_VC1_ADVANCED;
break;
case kCodec_HEVC_VDPAU:
vdp_decoder_profile = VDP_DECODER_PROFILE_HEVC_MAIN;
max_refs = 16;
break;
default:
LOG(VB_GENERAL, LOG_ERR, LOC +
"Codec is not supported.");
errorState = kError_Unknown;
return;
...
some frames are works fine but then the PC freezes.

Thanks for any idea?

[hrau]

same issue here when decoding DVB-T2 HD (HEVC) live TV
any solution available..?!

Thanks

[laasa]

Looks like that it is an issue with quickly switching interlace mode inside MythTV at the start of playing any content.
When I disable deinterlacing for HEVC material it works.

[hrau]

perfect; thank you
DVB-T2 HD works now !!
patch should be implemented offical

[chiluk]

Has anyone looked at integrating this into the git? Is there an open bug trac about this? I'm interested in this fix as well. I'd be willing to push the fix into Ubuntu once it's integrated into mythtv master.

Looking at the patch though, I don't think that disabling de-interlacing is the correct answer. I have a feeling something needs to be fixed in the if (enable) section of VideoOutputVDPAU::SetupDeinterlace instead.

[chiluk]

Looking more closely, h265/HEVC support needs to be added to VideoOutputVDPAU::DrawSlice.

[chiluk]

I created a ticket for this.
https://code.mythtv.org/trac/ticket/12992

[pgbennett]

I have committed the patch to MythTV git. It is available in fixes/29.

[halucigenia]

Hi, I just came across this thread and wanted to test out HEVC decoding via VDPAU inside MythTV.
I have a GTX1050Ti which should be capable.
I have updated to mythtv-frontend amd64 2:29.1+fixes.201812281328.af5d819
I am using the VDPAU high quality playback setting
I have a video file which shows the following in mediainfo
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L4.1@Main
Codec ID : V_MPEGH/ISO/HEVC

But it won't play...

Is there something that I am missing?

[pgbennett]

Only certain NVidia cards will support H265. See https://developer.nvidia.com/video-enco ... ort-matrix
H265 was disabled in some versions of FFmpeg VDPAU, but is enabled in the latest version..
The latest master source of MythTV has been upgraded to FFmpeg 4.1 and VDPAU HEVC works there.
The latest master also has support for NVDEC, which works with HEVC.

[halucigenia]

OK, pgbennett, so are you saying that it won't work with mythtv-frontend amd64 2:29.1+fixes.201812281328.af5d819 and I would have to install the latest master source?

[halucigenia]

OK, after further experimentation I have found that I can use HEVC decoding via VDPAU inside MythTV with my hardware and current build of MythTv as long as it is 8bit and not 10bit encodes (that's what I was missing).

However, I see that things may be different in MythTV 30:-
"Hardware accelerated H.265/HEVC decoding with VDPAU is not available any more for Nvidia users. (This feature may come back in MythTV 31 with the NVDEC extension. In the meantime OpenGL playback is recommended for H.265/HEVC playback. Another option is to stay with MythTV 29, perhaps with the patch in #13211, if surround sound is used, e.g. for German DVB T2 HD.)"
https://www.mythtv.org/wiki/Release_Notes_-_30

So I may be waiting until MythTV 31 is available before I next upgrade if I want to keep HEVC decoding via VDPAU inside MythTV working.

[pgbennett]

It looks that way. It is working in Master if you want to run that, with the caveat that it may be less stable than the release version. However many people use the Master version.