On 23 Jul 2015 at 21:56, Colin Law Colin Law <clan...@gmail.com> wrote:
> On 23 July 2015 at 09:59, Jim web <w...@audiomisc.co.uk> wrote: > > ... > > 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> > > You might occasionally find this gives strange effects at the start of > the new file. If you switch the options round so -i infile appears > before -ss ".." then it stops this happening. I think putting them > this way round makes sure it scans the input file from the start so > that the first frames of the output file are complete, whereas with > them the other way round it just jumps in at the start point which can > lead to strange artefacts. Something like that anyway. Colin, Useful info, thanks. If ffmpeg is starting the cut at the exact time if -ss before -i that implies it misses the necessary "key frame". The arefcats are a result of frames between key frames only containing changes from previous frame. I use mkvtoolnix to split videos - with much laborious altering of split time to find +/- ss key frame - then remux mkv back to mp4 through ffmpeg cli. Is there any quick way to find key frame times? Peter ----- Web Hosting and VPS provided by HostSlim https://clients.hostslim.eu/aff.php?aff=079 _______________________________________________ get_iplayer mailing list get_iplayer@lists.infradead.org http://lists.infradead.org/mailman/listinfo/get_iplayer
