[mythtv-users] Anyone running MythTV 31 on 32-bit x86 with nVidia card?

Tom Dexter digitalaudiorock at gmail.com
Thu Feb 11 14:49:59 UTC 2021

On 2/11/21, George Mari <george_mythusers at mari1938.org> wrote:
> On 2/10/21 11:56 AM, Tom Dexter wrote:
>> My trusty old frontend is a 32-bit x86 machine with a GT 430 nVidia card.
>> Quite some time ago I upgraded to MythTV 30.0 but ended up reverting
>> back to 29.1 because I had some issues with some (though not most)
>> h264 videos. Specifically, some h264 videos would fail the VDPAU
>> decode and fallback to software decoding. These were videos that used
>> VDPAU with no issue in other players like xine, and also in MythTV
>> 29.1. This was never resolved and was an issue that apparently
>> couldn't be reproduced on 64 bit systems.
>> My understanding is that the FFmpeg hardware acceleration code has
>> been radically changed in version 31.
>> As per the subject, if anyone is running MythTV 31 on 32-bit x86 and
>> is using an nVidia GPU, it would help me enormously if they could test
>> this example:
>> http://jell.yfish.us/media/jellyfish-60-mbps-hd-h264.mkv
>> ...and see if it uses VDPAU decoding, which can be determined during
>> playback from the menu under Playback -> Playback Data.
> I have a 64-bit Fedora installation with a GT 430 card - not exactly
> what you are asking for, I know.
> But for me, the video Playback Data shows h.264 ffmpeg

Wow. So it's NOT using VDPAU, and that's with MythTV 31? That is
really not good news at all. Do other h264 videos use VDPAU? That
sounds like a significant bug to me. Even on my 32-bit system that
video uses VDPAU without issues in xine, mpv, and in MythTV 29.1.

When I was temporarily on 30.0 I posted comments about this on this
(semi-related) bug, but at that time apparently nobody using 64-bit
could duplicate this one:


As noted there, the error that caused it to fallback to software
decode was this:

2019-05-17 10:37:09.222935 E [14504/28060] Decoder
avformatdecoder.cpp:3785 (ProcessVideoPacket?) - AFD: video
avcodec_send_packet error: Invalid data found when processing input
(-1094995529) gotpicture:0

I'm hesitant to update, though I'm going to have to soon, as (for a
number of reasons) I can no longer compile MythTV 29.1 on my Gentoo
system. What's worse is that, since I'm running 29.1 I can't very well
log a bug or test any of this.

I'd be interested to see what others find testing this...with 32 or 64
bit. Thanks for the reply! That's significant for sure.


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