[mythtv-users] Black blocks in video after CBS Buffalo (WIVB) adds first subchannel on new encoder

Ian Evans dheianevans at gmail.com
Tue Oct 24 21:04:36 UTC 2017

On Tue, Oct 24, 2017 at 6:40 AM, Michael T. Dean <mtdean at thirdcontact.com>
> On 10/23/2017 03:21 PM, Ian Evans wrote:
>> On Oct 23, 2017 3:04 PM, "Peter Bennett" wrote:
>>     On 10/23/2017 11:11 AM, Ian Evans wrote:
>>>     I'm still leaning towards that as I'm pretty sure I'm just seeing
>>>     it on this station.
>>     Perhaps you missed it in my email -  I am also seeing those
>>     glitches with VDPAU on just one station. The other 500 or so
>>     channels that I get are fine.
>> Didn't miss it. Was just saying I briefly had a creeping doubt due to my
recent upgrade but as it's just this channel AND they have a new encoder,
it's probably them. :-)
> But did you try changing your decoder to Standard?  It's quite likely
their new encoder is doing things differently, but that doesn't mean it's
doing things wrong.  It may well be that your decoder (VDPAU) may not
handle their encoding properly.  You can still use VDPAU rendering even if
you don't use VDPAU decoding. Just change the decoder in the Playback
Profile to Standard and see if it works.  FWIW, I've been running with
Standard decoding and VDPAU rendering ever since VDPAU went in specifically
because some of my channels have artifacts when decoded with VDPAU.  So, if
you happen to have channels/video that don't decode properly with VDPAU,
and if you have a sufficiently-powerful CPU to use FFMPEG for decoding,
using Standard decoding with VDPAU rendering gives you the best of both
worlds--great decoding that doesn't show visual artifacts ("Just Works")
/and/ the best video rendering available on GNU/Linux.

Hi Michael,

Before I get to a further question, I'd like to say what happened last

Recorded the opening of Big Bang Theory was has very rapid cuts. Blocks
appeared throughout. VDPAU High Quality (Which I've used successfully since
2011.) NVIDIA card.

I decided to check on my desktop (ATI Card). Downloaded the file. Played
the opening of Big Bang Theory. Transitions were smooth as glass.

Decided to check the opening of Big Bang Theory from a few weeks ago back
on the Mythbox. Recorded before WIVB changed their encoder. Smooth as
glass. So yeah, it's got to be how the WIVB encoder is reacting with my

Went to Setup>Video>Playback. Changed to VDPAU Normal. Still blocky.

Which brings me to my next question: you mentioned changing my decoder to
Standard. Okay, just found that in the menu. So now I have the decoder set
to Standard and the Video Renderer set to vdpau. Just played back the
opening of last night's Big Bang Theory and...no blocks! So thanks for the

But as I was in that menu (My first time seeing it.) I realized I never set
any deinterlacers. (I have a 1080i TV). Which deinterlacers should I set
for a GeForce 430?
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