[mythtv-users] Cutting HD-PVR recordings

Marius Schrecker marius at schrecker.org
Fri Dec 11 15:43:11 UTC 2009

>On Fri Dec 11 15:31 , Doug Vaughan <r.d.vaughan at rogers.com> wrote:For HDPVR recordings I use Avidemux to manually perform lossless edits. 
>The restriction is that I must force my STB to only output at 720p. You 
>must save the edited file in an avi container and then use ffmpeg to 
>copy file avi into a mkv and add a seek table. The audio sync and 
>general quality has been excellant. On the rare occassion that there is 
>an audio seek issue, I use mkvmerge_gui to resync the audio.
>To make this experience easier I created a Nautilus script that combines 
>starting Avidemux and creating the mkv file with ffmpeg after you exit 
>I also use a compiled version of Avidemux as my distro's package seems 
>to lack some options (Ubuntu 9.10).
>One other thing I should mention is that before editing I have a userjob 
>to rename the recording and copy it to a physically separate hard drive. 
>Editing and recording at the same time cause disk thrashing which will 
>cause issues if you are recording at the same time. You can use rsync 
>with bandwidth option (--bwlimit) in the userjob to control the disk 
>thrashing during the copy and rename process.
>Although this article is out of date the section on Avidemux and the 
>HDPVR is correct. 
Thanks Doug,

  Especially for the tips about compiling avidemux, and the disk thrashing issue. I have some spare disk space on a separate drive that I didn't know what to do with, now it seems it might be useful after-all ;-)



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