[mythtv-users] Weird old-frame problem editing recordings, but only at 5+ second jumps (even after .24 +fixes upgrade)

[Kingsley Turner]

On 30/06/11 10:03, Kingsley Turner wrote:
> On 29/06/11 18:37, John Pilkington wrote:
>> On 29/06/11 01:09, Kingsley Turner wrote:
>>> I have this problem with the MythTV video editor/trimmer thing.
>>>
>>> When I step through the video at 1-frame, 0.5 seconds, or 1 second
>>> everything is OK.
>>>
>>> However when I step through at keyframe, 5 seconds (or more) the image I was
>>> viewing before pushing [right-arrow] (or [left]) obscures the new frame
>>> image.  However I do see the correct frame for a split-split-second before
>>> the old one obscures it.  So the 'cursor' is advancing through the video,
>>> but I can never see exactly where I'm up to.
>>>
>>> That sounds a bit convoluted - here's an example.
>>>
>>> Say I have a news recording before a program I want to trim off.  On my
>>> screen I see the face of the news-anchor-dude.  I set the jump to 1 second,
>>> and press [->] and the cursor advance, and a new video frame is shown (it's
>>> still the same guy though).  All this is correct.
>>>
>>> So I up the jump time to 5 seconds, press [->].  I see a screen flash of the
>>> new frame, but it's immediately covered by the frame I started on (the news
>>> reader).  I push [->] about 10 times.  As I do it, I can see the cursor
>>> advance, and a flicker of the correct frame (into my nature-programme now),
>>> but every time that original news reader image is back.  I set the jump-time
>>> back to 1 second, and it works fine.
>>>
>>> I had this problem with 0.23, but had hoped it would go away with 0.24.  It
>>> hasn't.  It's a real problem with the keyframe jump.  I want to trim every
>>> last peice of the previous programme away, but this problem makes it really
>>> difficult - almost trial and error.
>>>
>>> I run the nvidia-binary driver - NVIDIA-Linux-x86-260.19.29.  But various
>>> upgrades to this driver have yielded no resolution.
>> My memory of this is rather hazy:  I used to see behaviour a bit like
>> this with the editor, although I don't  recollect anything
>> 5-second-specific.  I think it had to do with the video-blitter
>> settings, or maybe it was Qt vs GL.  I don't see it now, and a quick
>> look at the frontend settings hasn't shown anything that clicks.
>>
>> In my nVidia X server XVideo settings I have the Video Texture and Video
>> Blitter both synced to VBlank on the monitor, and  OpenGL _not_ synced
>> to VBlank, with flipping allowed.  These settings may not make any
>> sense, but if they differ from yours they may be worth trying.
> I replicated your nVidia settings, but to no effect I'm afraid.
> I might have a play with the Qt/GL settings and see if anything comes of it
Hmm ... nothing changes do with switching Qt <-> OpenGL rendering either.

Guess I need to re-install from scratch or something.  Might wait a few more 
years yet ;)

-kt