[mythtv-users] Transcode script that keeps show in Recordings

[John Pilkington]

On 09/06/2023 08:00, Lists wrote:
>     -----Original message-----
>     *From:* Jay Harbeston <jharbestonus at gmail.com>
>     *Sent:* Thursday 8th June 2023 15:58
>     *To:* Discussion about MythTV <mythtv-users at mythtv.org>
>     *Subject:* Re: [mythtv-users] Transcode script that keeps show in
>     Recordings
> 
> 
> 
>             Can you do the following command on the file that has the
>             audio go away? :
> 
>             ffprobe -i  file.ts
> 
> 
>             And post the results in a reply. I want to see how the audio
>             streams get defined by ffmpeg.
> 
>             Jay
> 
> 
>         Sadly I don't have any of those files available now, but when I
>         was checking them the other day, there was no audio track
>         reported by mediainfo or vlc player. When I was watching the
>         encoding, I could see that audio was reported as zero bytes
> 
> 
>     There may be a copy of the original file saved as  file.ts.orig in
>     your recordings directory  if you didn’t add the the dontremove flag
>     on the ffcut command .
> 
>     Jay
> 
> 
> I'm just transcoding another file with your ffmpeg commands - this is 
> the ff0.log contents:
> 
> *dave at mythtv*:*/tmp/myth297314*$ tail -f ff0.log
> 
>    Stream #0:1[0x1100]: Audio: ac3 ([129][0][0][0] / 0x0081), 0 
> channels, fltp
> 
> Output #0, mpegts, to '/tmp/myth297314/tmpfile0.ts':
> 
>    Metadata:
> 
>      encoder         : Lavf59.27.100
> 
>    Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, 
> bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 24 fps, 24 
> tbr, 90k tbn
> 
> Stream mapping:
> 
>    Stream #0:0 -> #0:0 (copy)
> 
> Press [q] to stop, [?] for help
> 
> frame=130215 fps=5553 q=-1.0 Lsize= 5446811kB time=01:30:25.95 
> bitrate=8223.5kbits/s speed= 231x
> 
> video:5298670kB audio:0kB subtitle:0kB other streams:0kB global 
> headers:0kB muxing overhead: 2.795805%
> 
> 
> ffprobe on the original file for the above transcode looks like this:
> 
> *dave at mythtv*:*/tmp/myth297314*$ ffprobe 
> /media/myth/tv/81003_20230529172000.ts
> 
> ffprobe version 5.1.2-3ubuntu1 Copyright (c) 2007-2022 the FFmpeg developers
> 
>    built with gcc 12 (Ubuntu 12.2.0-14ubuntu2)
> 
>   (Configuration details removed to reduce size of email message)
> 
> 
> [mpegts @ 0x55a29ff90bc0] start time for stream 1 is not set in 
> estimate_timings_from_pts
> 
> [mpegts @ 0x55a29ff90bc0] stream 1 : no TS found at start of file, 
> duration not set
> 
> [mpegts @ 0x55a29ff90bc0] Could not find codec parameters for stream 1 
> (Audio: ac3 ([129][0][0][0] / 0x0081), 0 channels, fltp): unspecified 
> sample rate
> 
> Consider increasing the value for the 'analyzeduration' (0) and 
> 'probesize' (5000000) options
> 
> Input #0, mpegts, from '/media/myth/tv/81003_20230529172000.ts':
> 
>    Duration: 01:42:11.58, start: 3.014378, bitrate: 8717 kb/s
> 
>    Program 1
> 
>    Stream #0:0[0x1011]: Video: h264 (High) ([27][0][0][0] / 0x001B), 
> yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 
> 24 tbr, 90k tbn
> 
>    Stream #0:1[0x1100]: Audio: ac3 ([129][0][0][0] / 0x0081), 0 
> channels, fltp
> 
> 
> And this is the ffprobe for the transcoded file:
> 
> *dave at mythtv*:*/tmp/myth297314*$ ffprobe tmpfile0.ts
> 
> ffprobe version 5.1.2-3ubuntu1 Copyright (c) 2007-2022 the FFmpeg developers
> 
>    built with gcc 12 (Ubuntu 12.2.0-14ubuntu2)
> 
> 
> 
> Input #0, mpegts, from 'tmpfile0.ts':
> 
>    Duration: 01:30:25.67, start: 1.817000, bitrate: 8223 kb/s
> 
>    Program 1
> 
>      Metadata:
> 
>        service_name    : Service01
> 
>        service_provider: FFmpeg
> 
>    Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), 
> yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 
> 24 tbr, 90k tbn
> 
> 
> 
> 
> Regards,
> 
> Dave.

I get that 'deja vu all over again' feeling.  Perhaps try

mythffmpeg -fflags +genpts -i inputfile -acodec copy -vcodec copy 
-scodec copy -f mpegts outputfile

and rebuild the seektable.  Then run the script again.

https://github.com/bennettpeter/android-MythTV-Leanfront/issues/54#issuecomment-1368201782

https://github.com/MythTV/mythtv/issues/600

HTH

John P