Jittery Video

[asthepenguinfly]

I just switched to sage 6.0 RC2, and I'm getting jittery video on live tv. If I skip back a couple seconds, everything looks fine. The only time video is jittery, is when I am at the "edge" of what is recording. Anyone else seeing this?


EDIT: BTW, this is running on a dedicated pvr box, 6150 onboard, 3500+, 1gb ram, nvidia dualtv and the latest nvidia drivers (purevideo etc). CPU usage is below 20% the entire time during playback, so I assume that it's simply trying to play when the buffer isn't quite built up.

[Narflex]

There's a property you can tweak which'll increase this buffer size:

videoframe/local_encoding_to_playback_delay=0


It's in milliseconds, so try something like 1500 and you should probably be OK then.

[asthepenguinfly]

From what I've seen this problem seems intermitent. Sometimes it does it, sometimes it doesn't. This was never a problem before, so I believe it is a software problem, nothing has changed aside from sagetv. Is it possible that this is an adverse effect of the dualtv workaround? That's the only thing I can think of at the moment.

EDIT: If it is in fact an effect of the workaround, perhaps something could be fixed within that to remove this problem?

I'm going to try and set the buffer higher, the problem is, it's not something I can replicate. I've tried multiple times to replicate it, and it won't. I'm almost positive that it has to do with the dualtv workaround though. That is unless default buffers were changed in this version, though that seems unlikely.

[asthepenguinfly]

I've found that this problem is replicated near every time I move to the source setup screens. This leads me to believe it is a problem with the workaround.

[Major_A]

To see if we are having the same problem I'll try to describe my issue. I can either be watching TV, a recording, or browsing the program guide and the video seems like it "jumps". Sometimes it will do it constantly other times it is pretty intermittent. I remember having the issue in early V5 builds but it seems to be back again.

[asthepenguinfly]

My problem is slightly different and I believe it has to do with a workaround created for my capture card's controls. Essentially what I believe has happened is this workaround has caused my card to be just slightly slower, so when it tries to grab video for live tv, it occasionally asks for what is not yet 100% there. I am rather positive the solution Narflex gave above will solve the problem, I'm just trying to see if there's not any other solution. Though, with the release of version 6, not sure I'm gonna see if get fixed anytime soon.

[Keenan]

Originally Posted by Narflex

There's a property you can tweak which'll increase this buffer size:

videoframe/local_encoding_to_playback_delay=0


It's in milliseconds, so try something like 1500 and you should probably be OK then.

What's the difference between the above property and the below?

videoframe/network_encoding_to_playback_delay=0

My local setting was already at 1500, but the network one was set to 0.

Also, isn't there a spot somewhere on this forum that explains what all these properties and/or what they do?