In article <[email protected]>, Budgie <[email protected]> wrote: > Hi Jim, Thanks for the reply. Yes I wondered if "passing through" > ffmpeg would do the trick but was not sure of correct commands. Will > try on a copy. No time at present. Book keeping!!! Alastair.
FWIW I tend to use this to 'snip' files ffmpeg -ss "hh:mm:ss" -i infile.<ext> -acodec copy -vcodec copy -t "hh:mm:ss" output.<ext> The codec copy parts ensure the 'payload' is unchanged. (You can use the simpler way to specify this as Vangelis has explained. I use the above because there are times when I want to alter one codec or the other and this approach reminds me of what's going on.) The -ss and -t parts are optional for taking a section out of the input file. If you leave them out it should just try to tidy up - and recontainer if you've chosen a different output container format. The -ss specifies a start point at a time in hours:mins:sec from the start of the input file. The -t specified a duration for the output file length, staring from the -ss time. Mention this in detail because yesterday I found a file I'd downloaded using gip that has a 'glitch' at the start. If I play it normally with VLC the picture jumps and gives blocking rectangles during the first sec and the time count showed by VLC jumps. If I just let VLC play on the vision and sound are out of lip synch by a fair amount. However if I jump forward or back at all, lip synch is restored. Its the first time I've seen this for a gip fetched file. But I've seen this in captures from DVB-T2. I've not done it yet, but I suspect that simply using the above to trim the first second or two off the file will remove the problem. BTW The VLC option I wanted to suggest was as follows: Try using vlc --codec avcodec,all <filename> when playing files. If it can find the correct things that may help VLC to play files that its default choices have timestamp or other problems with. Here it also helps minimise problems with DVB-T2 captures where the audio codec *changes* on the fly during transmission. Note as I've said, though, this may depend on what versions/packages you have installed. BTW2 If you are using Linux I'd recommend you check out ROX filer. I tend to write my own simple desktop ROX front ends for things like the above so I can use them via drag-and-drop or a click. Not to everyone's taste, but I much prefer it. Albeit that I run ROX filer *and* xfce in parallel. :-) Jim -- Electronics http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html Audio Misc http://www.audiomisc.co.uk/index.html _______________________________________________ get_iplayer mailing list [email protected] http://lists.infradead.org/mailman/listinfo/get_iplayer
