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

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-----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.
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