[mythtv-users] hd-pvr and mytharchive: cutting commercials before re-encoding?

[belcampo]

Will Dormann wrote:
> Hi all,
> 
> I've been playing around with mytharchive on my new mythtv system.  I've
> already gathered that one of the current weaknesses with the ion
> platform is that mythcommflag and mytharchive (ffmpeg) won't leverage
> vdpau for decoding hd-pvr content.  In testing mytharchive, I tried a
> 10-second long cutlist from a recording so that I don't have to wait a
> day for each test!
> 
> The problem I am running into is that the commercial cutting appears to
> happen *after* the transcoding from mpeg4 into mpeg2.  This appears to
> be the case regardless of whether the mytharchive option to use
> mythtranscode or projectx is selected.
> 
> Wouldn't it make sense to cut commercials *before* re-encoding the
> video?  This would be a nice performance gain for us low-power backend
> folks, but I would think that it would also "clean up" video streams
> before encoding.   The test I ran last night stopped with the following
> ffmpeg errors in mythburn.log:  "error, non monotone timestamps" and
> immediately following: "av_interleaved_write_frame(): Operation not
> permitted".   I assume that this is some sort of glitch in the
> recording, which happens to play back just fine.
> 
> I'm not sure about using mythtranscode with mpeg4 source, but from what
> I've read, ProjectX handles h.264 ts files just fine.
I would be very pleased to know where to read that "ProjectX handles 
h.264 ts files just fine", NOT AFAIK, at least not until recently.
> 
> 
> Thoughts?
> 
> 
> Thanks
> -WD
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