[mythtv-users] Alternatives to lossless transcode

[Mark Perkins]

> On 28 Sep 2013, at 3:58 am, "John Finlay" <finlay at moeraki.com> wrote:
> 
>> On 9/27/2013 11:11 AM, Raymond Wagner wrote:
>>> On 9/27/2013 12:40 PM, John Finlay wrote:
>>> Since lossless transcode in 0.27 seems broken in my tests what alternatives do you use to losslessly cut out commercials, etc.?
>> 
>> Is this a recent issue?  It was working fine for me a few months back on the 0.27 developmental builds.
> 
> Recent for me since I just upgraded to 0.27 and tried the lossless transcode. For example the original file is seen by ffmpeg like:
> 
> Input #0, mpegts, from '1071_20130925050000.mpg':
>  Duration: 00:59:57.84, start: 8442.162544, bitrate: 10573 kb/s
>    Stream #0.0[0x31]: Video: mpeg2video (Main), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 13216 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
>    Stream #0.1[0x34](eng): Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s
>    Stream #0.2[0x35](spa): Audio: ac3, 48000 Hz, mono, s16, 128 kb/s (visual impaired)
> 
> and after the lossless transcode:
> 
> Input #0, mpeg, from '1071_20130925050000.mpg':
>  Duration: 37:10:28.62, start: 0.316133, bitrate: 191 kb/s
>    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 13216 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
>    Stream #0.1[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s
>    Stream #0.2[0x81]: Audio: ac3, 48000 Hz, mono, s16, 128 kb/s (visual impaired)
> 
> 
> 
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://www.mythtv.org/mailman/listinfo/mythtv-users
[Mark] I had that exact problem on 0.26 (I assume by lossless transcode you mean mythtranscode). Searching previous threads I couldn't find a solution although there did seem to be a small number of people with the same issue. I gave up (after 100's of hrs of testing different things - I just couldn't nail it down) and ended up moving to dvbcut (I think it's called from memory) with the projectx cut switch. Note that dvbcut is not frame accurate. I haven't re-tried since moving to 0.27 but it is on the list of things to do. I also tried lossless_cut but always ended up with audio / video out of sync.