Bug 1015806 - mythtv+nouveau+older card = playback double speed, audio plays normal speed
Summary: mythtv+nouveau+older card = playback double speed, audio plays normal speed
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 19
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Ben Skeggs
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2013-10-05 17:41 UTC by Trevor Cordes
Modified: 2015-01-09 08:21 UTC (History)
11 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2015-01-09 08:20:35 UTC
Type: Bug

Attachments (Terms of Use)

Description Trevor Cordes 2013-10-05 17:41:24 UTC
Description of problem:
I upgraded from Fedora 18 (nv driver) to 19 (nouveau driver, as 19 got rid of nv), and all mythtv frontend viewing started having double-speed video, but the audio was still 100% ok (normal speed). 18 to 19 did not change the myth versions.

I tried every myth option, every decoder, every deinterlacer, and it stayed double speed. Even setting audio to NULL didn't help. Did it on live TV as well as recordings.

When I did a while-watching options->playback->playbackdata it would show the mpg was 29.97 fps and the playback FPS was 59.75 to 59.99!!

Testing with
mythavtest -O LocalHostName?=abcdefg /data/Mythtv/Recordings/1888_20130708085900.mpg
made no difference. It still played double-speed.

Testing with mplayer /data/Mythtv/Recordings/1888_20130708085900.mpg
and the video was fine (not double-speed). Problem is in myth only.

I switch to the binary nvidia driver and the video was fine (not double-speed) without any other changes. So the problem appears to be unique to the nouveau driver.

The output from myth while double-speed shows nothing out of the ordinary.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. boot and start X using nouveau
2. run mythfrontend
3. playback any recording

Actual results:
Plays video at double-speed.  Audio is at normal speed.

Expected results:
Plays video and audio at normal speed.

Additional info:

Seems like it *might* be only on older 4-digit nvidia cards and not newer 3-digit cards based on other "me-too" reports.  This may explain why it's not hitting more people.

See mythtv upstream bug:

Though I think this is probably a nouveau thing, not a myth thing.

Comment 1 David Howells 2013-11-19 23:14:01 UTC
I saw this with F19 and now see this with F20.


01:00.0 VGA compatible controller: NVIDIA Corporation GF106 [GeForce GTS 450] (rev a1)

[   641.975] (--) NOUVEAU(0): Chipset: "NVIDIA NVC3"

Comment 2 Trevor Cordes 2015-01-09 08:20:35 UTC
This was fixed upstream and made it into Fedora's stock kernel sometime around 3.12 or 3.14.

See upstream bug link in comment in initial comment.
Kernel commit that fixed it was 7d3428cd4b2


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