[FFmpeg-user] From mpeg2 to mpeg4

[FFmichael]

Jonathan Isom wrote:
> 
> On Sun, Oct 23, 2011 at 1:41 PM, Lorenzo Travaglio
> <lorenzo.travaglio@> wrote:
>> On Sun, 23/10/2011 17:34, Jonathan Isom wrote:
>>> Hi
>>>    The first thing just about anybody on this list will tell you is
>>> that you are using  a
>>> very old(2009) version. You should try to install a recent version.
>>> FFmpeg is under
>>> constant development so many options have changed and codecs improved.
>>>   It would
>>> also be beneficial to know the command line you tried. Also are you
>>> wanting just
>>> mpeg4 or mpeg4 AVC(aka h.264)?
>>
>> Thank you Jonathan for your answer.
>> This package is declared as "up-to-date" by apt-get. However I will try
>> to
>> download the source and to recompile even because some switches like '-a'
>> to
>> change the aspect ratio do not work.
>>
>> I tried many command line like "ffmpeg -i prova.mpg -vcodec mpeg4
>> prova4.mpg" but the results are very poor. In this particular case I
>> obtained a reduced but not visible file. In other cases I obtained
>> reduced
>> versions but video was very poor, as with "ffmpeg -i prova.mpg -s 720*368
>> prova3.mpg" or "ffmpeg -i prova.mpg -r 50 prova2.mpg".
> 
> You may wish to add a bitrate for the video(-b) and audio(-ab). -r is
> for framerate. you may get better results
> with 25 than 50 though that cuts it in half.  You'll have to test for
> your needs.
> 
> ffmpeg -i prova.mpg -vcodec mpeg4 -b 800000 -ac 2 -acodec mp3 -ab
> 128000 -r 50 -s 720x368 prova2.mpg
> 
> 
also....
mpeg4 video is not supported in a .mpg container. 
http://en.wikipedia.org/wiki/Comparison_of_container_formats
use .mp4 for your output instead.

Michael

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