[mythtvnz] Transcoding HD videos

[David Moore]

On 24/04/2012, at 9:40 PM, Brett <mythicalbeast at slingshot.co.nz> wrote:

> 
>> 
>> Are you guys also editing the HD Videos as well?
>> 
> Work in progress (ice-age slow) so no, not yet.
> 
> I would like to be able to use a user-job with the std myth cutlists.
> I think that time based cutlists could be better for fast
> seeking/cutting.
> 
> AFAIK
> avidemux 
> - supports cutlists
> - still no latm-aac support
> - 2.5 was frame based, 2.6 is time based, both are flakey IMO.
> 
> mkvtoolnix
> - supports time cutlists by splitting file, cuts to I frame.
> - no latm-aac support.
> - mkv output only (fine).
> 
> ffmpeg
> - can be scripted to cut in one pass with cutlist
> - frame accurate cutting requires video filter i.e. decode & slow
> 
> Converting ts to ps & (theoretically) stripping filler NALs could save
> 10% to 40%.
> 
> I have read that mkvmerge strips filler/stuffing NALs & ffmpeg does
> not..but I have not noticed any size reduction by processing with
> mkvmerge.
> 
> Brett
> 
> 
I wrote a crude but fast script (gist.github.com/508582) which cuts files using the cutlist. Not glitch-free sometimes at the cut points. Haven't used it for ages since the really time-consuming thing is making the cut list because no auto method is 100% reliable.