Opened 12 years ago

Closed 12 years ago

#6282 closed defect (invalid)

Audio/Video lagging on one particular HD digital channel.

Reported by: Josh Winters <fuxxociety@…> Owned by: Isaac Richards
Priority: major Milestone: unknown
Component: MythTV - Video Playback Version: 0.21-fixes
Severity: medium Keywords:
Cc: Ticket locked: no


Hello everyone. I've been doing a LOT of searching, but found no real answers.

When tuning a particular HD channel (specifically, KRIV Houston Digital), the audio and video start out fine, but after about 1 second of smooth playback, both audio and video are extremely choppy. 'mythfrontend -v playback' reports lots of "NVP: Video is 14.21 frames ahead of audio, doubling video frame interval to slow down."

That leads me to suspect that the video rendering isn't the issue, it's the audio playback. I tested by disabling audio in the frontend (by selecting the NULL audio device)

Once audio was disabled, the affected channel played back BEAUTIFULLY. No dropped frames, no lag, no error messages in the frontend.

I have seperate backend/frontends also, so no tuner card sharing an IRQ.

My frontend is a Core2Quad Q6600, running on an ASUS P5N7A-VM mobo, with 1GB Samsung DDR2 Distro: Gentoo linux

I also have an Ubuntu laptop running mythfrontend, the laptop plays the affected channel beautifully (with sound!) Laptop specs: Toshiba X205-sli4 - Core2Duo T8100, 2x 8600M GT's, 3GB RAM

Anyone have any ideas? Uploading a test clip to megaupload now, will reply with the URL.

Change History (5)

comment:1 Changed 12 years ago by Josh Winters <fuxxociety@…>

Here's the link to the video file.

comment:2 Changed 12 years ago by Josh Winters <fuxxociety@…>

Oop, here is the actual link

comment:3 Changed 12 years ago by robert.mcnamara@…

Plays perfectly here on a machine with identical processor and motherboard.

comment:4 Changed 12 years ago by fuxxociety@…

Do you think it could be related to sound hardware? When sound is disabled in mythfrontend setup the recording plays perfectly.

I have been using coaxial spdif output on my SB Audigy4 value, and also tried removing the Audigy4 and trying analog output on my onboard card. It seemed like the stuttering and lag got worse with the onboard card..

Any suggestions?

comment:5 Changed 12 years ago by stuartm

Resolution: invalid
Status: newclosed

Configuration/hardware issue.

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