[mythtv-users] Lossless Cut and keyframe cuts off

Nick Rout nick.rout at gmail.com
Fri Nov 16 04:30:44 UTC 2012

On Thu, Nov 15, 2012 at 9:52 PM, HP-mini <blm-ubunet at slingshot.co.nz> wrote:

> On Wed, 2012-11-14 at 14:55 -0500, Doug Vaughan wrote:
> > Brett,
> > As tosuggestion #3. Lossless Cut always, even when there was noskip or
> > cut list, starts the first segment on the first non-zero keyframe as
> > identified in the seek table. That was done to avoid the video
> > corruption which displaysat the very beginning of the recorded file
> > prior to thefirst keyframe. Basically I tried to account for the issues
> > you are describing before the first keyframe.
> >
> I was trying to describe an inconsistency between mythtv playback &
> cut-list editor..They show different picture at the same frame index..
> The behaviour before the first keyframe is a clue maybe not the cause.
> I was trying to explain how ffmpeg decoder could influence this..
> This offset error would apply at any point in recording.
> I have "start on sequence header" selected, I see no corruption in start
> of playback, just the odd cut-list editor navigation..
Just a question about this thread in general, how do you tell from mythtv's
editor whether the frame you are on is a keyframe or not? Is it guesswork
from scene transitions? Or is it theme dependent ( I tried arclight and
blue abstract and couldn't see any info on this).
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