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 turns out it is somewhat in between.
I am using Window with the command window. I do not use linux etc. but I have some unix commands in dos command window. man ffmpeg does not come up with man page, maybe my manpath has not set up. That is OK, I just want it to do simple thing. Is there a GNU version of ffmpeg? *Stephen Ho * 510-364-8941 (c) stephenh...@gmail.com 925-398-6808 x183 (vm) StephenHoRealty.com <http://www.StephenHoRealty.com> On Tue, Aug 5, 2014 at 2:01 AM, James Darnley <james.darn...@gmail.com> 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 > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user