[mythtv-users] Jumping frames while editing
John Pilkington
J.Pilk at tesco.net
Wed Nov 11 08:40:31 UTC 2009
John Pilkington wrote:
> Jim Stichnoth wrote:
>> When I edit a recording to set cut points, there is some odd behavior
>> when skipping backward or forward by N seconds. Instead of skipping
>> immediately to the desired frame, often it jumps through several
>> frames until it converges on the desired frame. For ATSC recordings
>> (mpeg2), there might be a couple of these intermediate frames. For
>> HD-PVR recordings (h.264), there could be up to 6 or 7.
>>
>> I understand that this is how seeking works -- find the closest
>> keyframe and then advance frame by frame until the exact frame is
>> found. But is there something I can do to keep these intermediate
>> frames from being displayed to the screen?
>>
>> This has been the case in 0.21 and 0.22, for many versions of the
>> nvidia driver through my current version (190.42). I see this with
>> the VDPAU profile and the Slim profile. I tried setting and unsetting
>> the "Seek to exact frame" setting, with no difference. The hardware
>> is a diskless single-core IONITX box.
>>
>> Jim
>
> I'm seeing something very like this on my box running 0.22-fixes from
> ATrpms under CentOS 5.4, but not with the corresponding build on 64-bit
> fc10. The CentOS box didn't do this in 0.21-fixes. Recordings are from
> dvb. Both use nvidia, neither uses VDPAU. Drivers are 96.43.13, 190.42.
> I'll do more experiments, but suggestions would be welcome.
What I'm seeing looks as if it may be
http://svn.mythtv.org/trac/ticket/7523
although my first attempts at tweaking nvidia haven't entirely restored
normal operation.
Thanks to Mike Dean for pointing to this in
http://www.gossamer-threads.com/lists/mythtv/users/406836
>
> While on the subject of the editor: I've often wondered why the time
> counter isn't linked directly to the image I see; there's usually a
> one-step hysteresis - i.e. an offset depending on the recent direction
> of stepping. It works, but it feels correctable. I haven't identified
> a ticket, or tried looking at the code :-(
>
> John P
>
>
>
>
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