[mythtv-users] Lossless Transcode 0.25

[Scott & Nicole Harris]

>>OK, here's what we got.  I tried playing a post transcode damaged file 
>>with
>>VLC (on Ubuntu and Windows).  Where in Myth playback, there would be a 1
>>second flash of purple lines, in VLC, it just stuttered all over itself at
>>those points.  More accurately, in Myth playback playcback is [fade to
>>commercial] -> [purple bars where lossless transcode took the commercial
>>out] -> [show picks up at cut point].  In VLC, it was [fade to
>>commerical] -> [5 - 6 seconds of black screen] -> [3 or 4 seconds of
>>stuttering audio and video before finally "catching" itself about 10
>>seconds
>>into the next scene of the show].

>>I then used mkvtoolnix and multiplexed it as requested.  When I played 
>>that
>>file back in VLC, it displayed the purple lines like Myth playback does.

>>mkvtoolnix als had some warnings while doing its thing....
>> --SNIP --

>>Now, one other thing I've noticed.  The purple lines every 50 seconds is
>>not
>>as consistent as the purple lines at every removed cutpoint (which is 100%
>>of the time) across recordings.   Some files have no 50 second purple and
>>some have it every 50 seconds, and it SEEMS (I can't 100% confirm this 
>>yet)
>>that 720p recordings have it every 50 seconds and 1080i recordings do not;
>>again both have them 100% of the time at removed cut points.

>The more I go through my 0.25 trancoded files past couple days, it's
>becoming pretty clear that it's the 720p programs (all of them) that are 
>the
>only ones affected with the purple line every 50 seconds....and it really 
>is
>50 seconds, almost to the tick.  The 1080i's only have it at cut points

I think I have narrowed it down to a Mythbuntu 11.04 thing.  My SBE still 
runs 10.04 and used to do all my transcoding, so I have it transcode a file 
rather than the MBE which I upgraded to 11.04 on the weekend and no purple 
lines.  I believe I will be downgrading the MBE to 10.04 next weekend.  I am 
assuming the ffmpeg libraries 11.04 uses are not like by mythranscode, 
though this is just a guess.