Why mp4 or mp4.ts from identical installation?

[RS]

>From: RS Sent: Thursday, February 9, 2017 2:00 PM

>You won't get any support for Flash or rtmpdump.  They have been deprecated 
>for some months, and have been withdrawn in v2.98 of get_iplayer.

>You don't say which version of get_iplayer you are using or which Flash 
>mode you are trying to receive.  If you have v2.95 or above you can use the 
>HLS modes.  If you have been receiving Flashhd, try tvmode=HLShd

>You can find a table of modes available in v2.98 at
>https://github.com/get-iplayer/get_iplayer/wiki/modesref

Sorry, I am being obtuse.  If the downloaded file before multiplexing by 
ffmpeg has a suffix .mp4.ts, it is not a Flash file generated by rtmpdump. 
Flash files have a suffix .flv
.mp4.ts files are generated by the newer modes, HLS, HVF, and now in v2.98 
DVF.
The file size with HLShd is the same as the file size with FlashHD.
The file size with HLSvhigh is the same as the file size with Flashvhigh.

If the files sizes are different it is because you have specified different 
resolutions in your --tvmode options for the two installations.  That is not 
necessarily because of something you have done.  Confusingly the defaults 
have changed between versions of get_iplayer, and the definitions of 
composite modes such as best and better have also changed.

You can see which mode has been used from a line beginning
INFO: Trying hlshd1 mode to record
where hlshd1 will be replaced with the mode you are using.

You are more likely to get similar results between installations if you use 
the same versions of get_iplayer.  It will also help if you specify 
the --tvmode explicitly.  I suggest to begin with you stick to hlshd, 
hlsvhigh, and hlsstd.  Unless your connection is very slow you will find HLS 
is much faster than Flash, up to 80Mbit/s.

You are right that the lack of AtomicParsley will not make your files 
unplayable.  It may make seeking slower.