A few ffmpeg queries

RS richard22j at zoho.com
Thu Sep 7 14:19:48 PDT 2017

From: Alan Milewczyk
Sent: Thursday, September 7, 2017 21:10

>On 07/09/2017 03:09, Vangelis forthnet wrote:
>>> ffmpeg -i progname.ts -c:av copy progname.mp4
> >Very early in the morning here, so I'll be laconic for now :-)
> >Assuming you've not mistyped it,
> >-c:av copy
> >is not valid and probably the reason your command is initiating
> video+audio transcoding... Try
> >ffmpeg -i progname.ts -c copy progname.mp4

>Super, does the job beautifully.

Glad to hear you’ve got it working, so I’ll just make a couple of even 
further off topic comments.

A few weeks ago we were talking about HE-AAC and SBR support.  Out of 
curiosity I looked through descriptions and reviews on Amazon to see if any 
satellite receivers supported HE-AAC.  Some of the Humax ones do.  It seems 
from the reviews that some Humax models encrypt their recordings so they can 
only be played back on the machine that made them.  It sounds as though you 
have been lucky with your choice of model.

get_iplayer for some reason uses a different format for ffmpeg options 
depending on the value of ! $opt->{ffmpegobsolete}
7027 if ( ! $opt->{ffmpegobsolete} ) {
                   push @codec_opts, ( '-c:v', 'copy', '-c:a', 'copy' );
           } else {
                   push @codec_opts, ( '-vcodec', 'copy', '-acodec', 
'copy' );}

As far as I am aware all the variants Vangelis suggested work.

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