Video artifacts when playing recordings made with "Low Quality" profile

[Bob <bob@…>]

[Although this is specific to a recording profile, I'm filing this under "Video Playback" because that is the part that has changed... recordings made with 0.21 behave the same as recordings from 0.23-fixes] [Also, the mixed versioning is because I don't currently have the 0.24-fixes test system up and running..]

MythTV versions from 0.22 onward display graphical artifacts (including the top fourth of the screen being green) when playing recordings made with the "Low Quality" recording profile (with a PVR-150). The same recordings play fine in 0.21 as well as other players (including mplayer, VLC, and the Windows MythTV Player client). An example is currently here: ​http://organizedinsanity.net/MythTV/green.png

• Different playback profiles/filters make no difference.
• I've tried four different computers (via Mythbuntu LiveCD) to rule out hardware incompatibility.
• "--verbose playback" didn't seem to indicate anything unusual. I can try it again and attach the log if that's of any interest.
• Behavior is identical whether streaming from the remote backend or playing the files locally via MythVideo?.
• The commercial flagging process crashes for these recordings (again, 0.21 was fine). That's a more difficult thing to experiment with and investigate, so I only mention it because it may share the same root issue. I'll attach logging for this just in case.

[robertm]

Please provide a sample that exhibits the issue, as well as -v playback logs. You have set the version to .24-fixes but you are running .23-- and not even .23.1. Have you actually tested against the currently supported version? Please attach logs with .24, or even better, with current master.

[Bob <bob@…>]

Log from failed commercial flagging (not the main issue of the ticket, but possibly related)

[Bob <bob@…>]

Replying to robertm:

Have you actually tested against the currently supported version? Please attach logs with .24, or even better, with current master.

I have tested with: the pre-release 0.23 in the Ubuntu 10.04 repository, the actual release 0.23, 0.23.1, and 0.24. I tried installing 0.25 via mythbuntu, but it wouldn't let me for some reason, and it seemed very unlikely at that point to behave differently from the rest.

Ok, I'll get the -v playback logging out of 0.24 when I get it back up. I'll tell you now that my 0.24 testing is solely via mythvideo, since I'm disinclined to keep messing w/ the backend. I don't think that should be an issue, since it's all the same internal player and the behavior is completely identical.

[Bob <bob@…>]

Replying to robertm:

Please provide a sample that exhibits the issue

I don't know what this means. I linked a screenshot. Should I attach it instead? Or do you mean you actually want a short recording to test with?

[robertm]

Yes, we need an actual, playable video file that exhibits the issue. A screenshot provides no diagnostic info nor any means of testing a resolution.

[Bob <bob@…>]

Replying to robertm:

Yes, we need an actual, playable video file that exhibits the issue.

​http://organizedinsanity.net/MythTV/TestLQ.mpg

[robertm]

This file plays perfectly here in current master.

[robertm]

I revise-- it plays perfectly with hardware decode, the issue is with software decode. The same clip plays properly with ffplay so we are likely doing something wrong here.

[Bob <bob@…>]

Ah, yes. My claim that "different playback profiles makes no difference" should have mentioned that none of my video cards support VDPAU, so I haven't tested that.

[Bob <bob@…>]

Complete 0.24 log - opening frontend, playing a couple seconds in MythVideo?, exiting frontend

[Bob <bob@…>]

Forgot to add that the newly-attached log is with "-v playback". Probably not needed now that you've reproduced the issue, but I'm about to reformat/repurpose this test system. Also, in Comment #2 I left out 0.22, with which I have also tested and seen the issue.

[markk]

Possibly related issue in #9818

[Mark Kendall]

The supplied clip is one I have used for testing for many years. Works without issue with all hardware and software decoders in master and v31.