[Libav-user] Q regarding ffmpeg command to change bit rate of wmv file

[disha mishra]

Hi Matt,

Actually I tried to do the same thing with H264 files. I took an H264 file
as input file and specifed -b with some bit rate and tried to save it in
same container as input file but the output file that I get is an MPEG4-2
file.

Thanks,
Disha

On Thu, Aug 4, 2011 at 1:35 AM, Matthew Einhorn <moiein2000 at gmail.com>wrote:

> Running "ffmpeg -formats" list all the codecs that ffmpeg can
> decode/encode. If you look at vc1 you'll see that ffmpeg can only
> decode it not encode it. So you cannot save a file in vc1 format (I
> think). You'll have to select a different output format.
>
> Matt
>
> On Wed, Aug 3, 2011 at 2:33 PM, disha mishra <disha.mishra at gmail.com>
> wrote:
> > Yes I tried  -vcodec copy but that doesn't work.
> >
> > Thanks,
> >
> > On Wed, Aug 3, 2011 at 10:49 AM, Matthew Einhorn <moiein2000 at gmail.com>
> > wrote:
> >>
> >> On Wed, Aug 3, 2011 at 1:35 PM, disha mishra <disha.mishra at gmail.com>
> >> wrote:
> >> > Hi
> >> > I have a VC-1 file at Simple profile, medium level, bit rate = 236
> kbps.
> >> > I
> >> > use the following command to change bit rate and frame rate of file
> >> >
> >> > ffmpeg -i input.wmv -b 128k -r 15 output.wmv
> >> >
> >> > When I check the information of output file, it shows a file with
> MPEG-4
> >> > Visual format and codec MP43. Is there any way to produce an output
> file
> >> > with the  same VC1 Simple profile, medium level information as input
> >> > file
> >> > using ffmpeg?
> >> >
> >> > I tried using -f vc1 switch in the command but thats only for having
> raw
> >> > vc1
> >> > video output.
> >> >
> >> > Thanks,
> >> >
> >>
> >> Have you tried -vcodec copy? It's in the ffmpeg documentation.
> >>
> >> Matt
> >> >
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> >> >
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