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

[Mark Kendall]

On 30 June 2011 09:43, Kingsley Turner <krt at krt.com.au> wrote:
> 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 ;)

Perhaps related to http://code.mythtv.org/trac/ticket/9719 ?

regards

Mark