[ubuntu-in] FFMPEG Video to Mp4, Mp4 to video/audio problem

[Mallikarjun(ಮಲ್ಲಿಕಾರ್ಜುನ್)]

On Tue, Nov 10, 2009 at 12:21 AM, Mehul Ved <mehul.n.ved at gmail.com> wrote:

> 2009/11/9 Mallikarjun <mallik.v.arjun at gmail.com>:
> > On Mon, Nov 9, 2009 at 11:16 PM, Moz <listmoz at gmail.com> wrote:
> >> mp4 is only a container format, the codec used to encode the video is
> what
> >> matters, container could be any of the available ones. Perhaps you do
> not
> >> have the right codecs. Usually mencoder can do all this very well, but
> >> ffmpeg is also very good as well. Checkout
> http://en.wikipedia.org/wiki/Mp4
> >> for the format.
> >> Moz
> >>
> >
> > Oh, Thanks MOZ,
> > I had been using ffmpeg all these days, but will give mencoder a try and
> let
> > you know.
>
> mencoder is a great program too but I have been successfully using
> ffmpeg to convert video files to 3gp. Will be blogging on this quite
> soon.
> Following command worked for me to convert a file to mp4
> ffmpeg -i inputfile.flv -acodec copy -s 480x320 -r 30 -b 768 -ar 44100
> -ab 64 -y outputfile.mp4
>

This works, but how do you improve the quality of video & how to convert mp4
to other format.
Also if you could explain the parameters, i will be thankful


> Remember to put -acodec copy otherwise ffmpeg uses aac which will not
> give you any sound. You can play around with size(-s), frame rate(-r),
> bitrate(-b), audio rate(-ar) and audio bitrate(-ab).
>

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