[mythtv-users] Problem with MPEG-4 transcoded file (no bitrate or duration)

[mythtv at kosowsky.org]

John Pilkington wrote at about 08:49:48 +0100 on Tuesday, May 14, 2019:
 > On 14/05/2019 01:30, mythtv at kosowsky.org wrote:
 > 
 > > Perhaps a partial clue is that under v24, the transcoded file had an
 > > 'nuv' suffix while under v29.1 the suffix is 'ts'.
 > > Could it be an issue with the container?
 > > 
 > > Note that ffprobe shows both files to be of format NuppelVideo.
 > > 
 > 
 > That is the problem.  NuppelVideo is now seen as an an outdated format 
 > and support for it is fading away, even if it hasn't been officially 
 > dropped.  It might be dependent on the options used in the build of 
 > ffmpeg or mythffmpeg that you are using.
 > 
 > Google found this, but I guess you have already seen it:
 > 
 > https://www.mythtv.org/wiki/MythTV-HOWTO_-_0.27


I think I've made some progress.
It seems perhaps that myttranscode now transcodes into HTTP streaming
format which could explain lack of duration.

When I use ffmpeg to copy (and concatenate) the streams, I then get a
valid duration:
   ffmpeg -y -i <file.ts>  -c copy  <file2.ts>

However, when I do that, for some reason the keyframes/i-frames are
lost... so when I 'edit' no frames show up.

Also, 'mythcommflag --rebuild', gives the following error:
      No I-frames found, rewinding...


So, is there any way to use ffmpeg to rebuild the stream in a way
that:
1. Creates a single stream with a duration
2. Preserves the frames/i-frames/keyframes


Also, it's possible that I am way off base here...

Jeff