Am Dienstag 05 August 2014, 08:29:51 schrieb Stephen Ho: > Thanks everyone, I will be reading more about your suggestions. I also > found this http://manpages.ubuntu.com/manpages/oneiric/man1/ffmpeg.1.html > to be better than what I paid for the pdf book, as you can see I am the > very beginner, and thought the book is not a man page but some tutorial. It Ubuntu ships a very old manpage. Many things have changed since version 0.7.2.
Maybe you take a look at: http://ffmpeg.org/documentation.html Gerion > On Tue, Aug 5, 2014 at 2:01 AM, James Darnley <[email protected]> > > wrote: > > On 2014-08-05 08:48, Stephen Ho wrote: > > > I did this command ffmpeg -i abc.mp4 -f hevc abc.avi got my file > > > size > > > to 5% of the original, and the resolution is really bad and no sound. > > > > > > Then I did ffmpeg -i abc.mp4 -f h264 abc.avi and the file size is 45%, > > > > the > > > > > video resolution is great (like the input file), but still no sound. > > > > What do you expect to happen when you ask ffmpeg to create a raw video > > stream? -f controls the file format not the video codec. > > > > If you can't handle ffmpeg's own help, accessible through -h, try > > reading them online here: http://ffmpeg.org/documentation.html > > > > My suggestion for a good quality encode: > > ffmpeg -i INPUT -vcodec libx264 -preset medium -crf 21 -threads 0 OUTPUT > > > > I also wonder why you are wanting to re-encode an MP4 file. I doubt you > > will make it that much smaller and keep decent quality seeing the rest > > of your requirements. > > > > > > _______________________________________________ > > ffmpeg-user mailing list > > [email protected] > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
