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

[Matthew Einhorn]

On Thu, Aug 4, 2011 at 11:50 AM, disha mishra <disha.mishra at gmail.com> wrote:
> 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
Can you post the exact command? And possibly the sample video file?

Matt
>
> 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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