[mythtv-users] Mythtranscode (lossless cutting commercials) and audio track names

Ian Evans dheianevans at gmail.com
Sat Aug 3 21:43:40 UTC 2013


On Sat, Aug 3, 2013 at 5:34 PM, Michael Stucky <mike at stucky.us> wrote:

> On Sat, Aug 3, 2013 at 4:31 PM, Ian Evans <dheianevans at gmail.com> wrote:
>
>> Using 26-fixes with the .25 mythtranscode. Doing lossless cuts to take
>> commercials or pledge drives out to save a few gigs here and there until I
>> can get a new drive.
>>
>> Just curious if it's a setting I'm missing or does mythtranscode strip
>> out the audio track names?
>>
>> One of my PBS channels broadcasts older shows in English 2ch and Spanish
>> Castilian 2ch. After the lossless transcode I end up with two tracks that
>> are both Undetermined 2ch.
>>
>> Is there anyway for mythtranscode to leave the audio track names alone?
>>
>> Thanks!
>>
>>
>> It is my understanding that the problem is the conversion of the mpeg2
> "ts" stream to mpeg2 "ps". Any process (mythtranscode, projectx, ffmpeg,
> etc.) that does this conversion will loose the language identification. As
> a result most non-Myth video players and sometime MythTV itself have
> trouble selecting the "correct" or "best" audio track.
>
> The only solution I have found to this problem is remove unwanted audio
> track(s) before mythtranscode is run. Fortunately, ffmpeg/mythffmpeg allows
> you to specify which tracks to include and by default will copy the first
> video and first audio track as follows:
>
>   mythffmpeg -i INFILE -vcodec copy -acodec copy -f mpegts OUTFILE
>
> Will create a copy of a recording (INFILE) named OUTFILE that is still in
> mpeg2 "ts" format with only one video and one audio track. If you need an
> audio track other than the first one you can use the -map option as follows:
>
>  mythffmpeg -i INFILE -map 0:0 -map 0:2 -vcodec copy -acodec copy -f
> mpegts OUTFILE
>
> Will create a copy of a recording (INFILE) named OUTFILE containing the
> first and third tracks (the first track should be the video and the third
> track should be the second audio track).
>
> Now you can flag ads or any other content you want to remove and run
> mythtranscode without concern about the audio track selection.
>
> I included a sample of the script that I run as a USERJOB for everyone of
> my recordings in this thread (it is near the end),
> http://www.gossamer-threads.com/lists/mythtv/users/546934
>
> Thanks for the insight. I'll take a look at the thread.
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