[mythtv-users] Updated script for editing recordings

[Michael Stucky]

On Sat, Mar 9, 2013 at 3:47 PM, Michael Stucky <mike at stucky.us> wrote:

> On Sat, Mar 9, 2013 at 10:11 AM, Michael Stucky <mike at stucky.us> wrote:
>
>> On Sat, Mar 9, 2013 at 9:09 AM, John Pilkington <J.Pilk at tesco.net> wrote:
>>
>>>
>>>      I've put the two files, MythDVBcut.sh and pycut.py, here:
>>>>>>>
>>>>>>>     http://www.mythtv.org/wiki/__**MythDVBcut<http://www.mythtv.org/wiki/__MythDVBcut>
>>>>>>>     <http://www.mythtv.org/wiki/**MythDVBcut<http://www.mythtv.org/wiki/MythDVBcut>
>>>>>>> >
>>>>>>>
>>>>>>>  <snip>
>>>
>>>
>>>  This works well for SD content, I like the improved cutlist creation
>>>>>>> logic. But, as with mythcutprojectx, the script fails on HD content
>>>>>>> (HDHR tuner). 'mplex' gives about a dozen  "++ WARN: [mplex] Stream
>>>>>>> e0:
>>>>>>> data will arrive too late ..." and then "**ERROR: [mplex] Too many
>>>>>>> frame
>>>>>>> drops -exiting".
>>>>>>>
>>>>>>> Mike
>>>>>>>
>>>>>>>
>>> <snip>
>>>
>>>
>>>  Or, of course, it may all be OK apart from remux problems.   HD bitrate
>>>> too high for the DVD profile.
>>>>
>>>>
>>> I see something like this:
>>>
>>> INFO: [mplex] rough-guess multiplexed stream data rate    : 4333744
>>>    INFO: [mplex] target data-rate specified               : 10080000
>>>    INFO: [mplex] Setting specified specified data rate: 10080000
>>>
>>> man mplex says:
>>>     -r|--mux-bitrate num
>>>               The  total  (non  VBR)  / peak (VBR) bit-rate of the
>>> output stream in k Bits/sec. If unspecified and not set by a preset it is
>>> automatically calculated from the input
>>>               stream.
>>>
>>> ... so it could be worth adding --mux-bitrate 20000
>>>
>>> to the mplex command for an HD recording.  No promises.
>>>
>>>
>>> John
>>>
>>>
>> I read some of those same suggestions and had tried --mux-bitrate as high
>> as 9600. Will test with higher rates and see if that makes a difference.
>>
>> Mike
>>
>
> Success!! I had to increase --mux-bitrate to 50000 (about 5x the rate
> estimated by mplex) to get a clean run of mplex on 720p mpeg2 HD content
> from an HDHR tuner. Will test with 1080i content later today.
>
> Mike
>

Further tests indicate that a trial-and-error process is/maybe required for
each HD recording (channel??) to get a clean run of mplex. The only way I
have been able to get consistent results is to use mythffmpeg to remux into
an mkv container.

mythffmpeg -fflags +genpts -i $DEMUXPREF.m2v -i $DEMUXAUDIO -vcodec copy
-acodec copy "$OUTFILE"

Where $OUTFILE is the recording name with an .mkv extension. I move the
resulting file to my Video storage group, the file is playable on my
MythFEs and all my other media players.

Mike
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