[ATrpms-users] Mythtv 0.19-128 in FC3: transcoder defaults

[John Pilkington]

This doesn't look like a real ATrpms issue but the Myth Howto says ask 
your packager first.  I have seen this issue raised elsewhere but didn't 
  find a useful response.

When setting transcoder parameters in mythfrontend > utilities/setup >
setup > TV settings > Recording > Transcoders,  I select Autodetect from 
RTjpeg to MPEG4.  This gives me four sliders to play with, labelled:

Bitrate, Max quality, Min quality, Max quality difference between frames.

The last three carry a warning:  "Modifying the default may have severe 
consequences."

I have not found a button that will revert to the default values, nor 
have I discovered a way of finding out what these are after changes have 
been made.  Maybe I ought to read the source code?  In any case, I would 
expect the 'best' values to  depend on the parameters used to make the 
initial recording.

One command line issued by mythbackend read

/usr/bin/mythtranscode -j 8 -V 4099 -p autodetect

but neither -j nor -V features in mythtranscode --help and the 4099 
doesn't relate in an immediately obvious way to the slider settings.

Can anyone shine any light on this?

TIA

John Pilkington