[mythtv-users] Cutting HD-PVR recordings

Marius Schrecker marius at schrecker.org
Sun Dec 13 13:20:21 UTC 2009

>On Sat Dec 12 15:31 , Christopher Meredith <chmeredith at gmail.com> wrote:On Sat, Dec 12, 2009 at 5:52 AM, Marius Schrecker <marius at schrecker.org> wrote:
>> Christopher Meredith wrote:
>>>I cobbled together a script that does this using avidemux2_cli and
>>>which can be run as a user job. You can read more about it here:
>>>It usually works pretty well for me, but I have been noticing that I
>>>get sync problems on recordings where the HDPVR hiccups during
>>>recording. The resulting file starts out in sync then jumps out at the
>>>hiccup point. I'm not sure how this can be addressed (if at all).
>> Hi again,
>>  I was looking at this, and the mythcommflag patch ticket was closed as a wontfix with some comments about there being cleaner ways...
>> Is the patch still recommended/required, and will it compile into the 0.22 - fixes version of mythcommflag?
>Yes, the patch is still required but it does apply against recent SVN.
>As for "cleaner ways," I asked about that very thing a couple months
>ago and was told that there really is no other way, and that no one is
>working on HD-PVR support for mythtranscode. So for now, this is the
>only way.
>As for frame accuracy, unfortunately it is a limitation that it cuts
>to keyframes only. In fact, sometimes not even then. I've had the most
>success setting my cutpoints to one keyframe into the commercial and
>one keyframe into the show when it resumes from commercial. Avidemux
>seems to cut slightly to the "left" of the actual cutpoint locations.
>I've been having increasing problems getting clean transcodes out of
>avidemux. The resulting files usually jump out of sync at some point
>even though the source files playback fine. I'm wondering if truly
>lossless, reliable commercial cutting is actually possible at this
>point. I'm looking at recording at the highest bitrate, transcoding to
>mpeg2, then reencoding to lower bitrate h264 with mencoder and EDL
>(edit decision lists). That will give frame accuracy and I'm hoping
>minimal visible quality loss.


Thanks for all the info.

Then it looks as if the best solution for us "mortals"  is to just create skiplists/cutlists and leave the recordings uncut for the moment.

Diskspace will continue to get cheaper, so it shouldn't be a problem storing the extra gigabytes.



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