[FFmpeg-user] Need some help for saving bmp

[Etienne Buira]

On Thu, May 26, 2011 at 07:47:00PM +0800, 铁 慕容 wrote:

Please do not top-post.

> Not exactly the same. 
> 
> I used 
>           ./ffmpeg -i Inside10.dv  -idct simple -r 1 -t 00:00:01  -f image2 image%01d.bmp 

If you want only a fixed number of frames, you should use -vframes, and
drop the -r (as well as the useless -idct).

> for DV. 
>  
> and also tried: 
>           ./ffmpeg -i Frame1.VC3  -vcodec dnxhd -f image2 image%01d.bmp

As said before, you try here to put dnxhd inside bmp, which obviously
won't work. Drop that -vcodec.
If autodetection doesn't work, put your -vcodec to apply to your input
file, so before -i

> even
>           ./ffmpeg -i Frame1.VC3  -vcodec dnxhd -an output.mov
>  
> for VC3
>  
> The first one works fine, but the second and third give the same error message as metioned before. Could you recommend me a usable command to try?
> 
> Kind Wishes
>  
> Yours
> Chao.Guo
> 
> 
> 
>  
> > Date: Thu, 26 May 2011 12:15:12 +0200
> > From: etienne.buira.lists at free.fr
> > To: ffmpeg-user at ffmpeg.org
> > Subject: Re: [FFmpeg-user] Need some help for saving bmp
> > 
> > On Thu, May 26, 2011 at 04:43:34PM +0800, 铁 慕容 wrote:
> > > 
> > > Hi Guys
> > > 
> > > DO you know how to save a decoded file to bmp format? I used the following command to decode a VC3 file and save the result, but failed. The interesting thing is when I decode a dv file, it works.
> > 
> > With the exact same ordering?
> > 
> > > ./ffmpeg -i Frame1.VC3 -vcodec dnxhd -r 25 -b 200k -sameq -y -f image2 output%03.bmp
> > 
> > Here, -vcodec applies to output. Also, I doubt -b 200k -sameq (which
> > contradict themselves) is of any use for bmp output.
> > 
> > > The error message was given: 
> > > 
> > > [dnxhd @ 0x1447f20]video parameters incompatible with DNxHD
> > > Output #0, image2, to 'output%03.bmp':
> > > Stream #0.0: Video: dnxhd, yuv422p, 1920x1080, q=2-31, 200 kb/s, 90k tbn, 25 tbc
> > > Stream mapping:
> > > Stream #0.0 -> #0.0
> > > Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
> > ^^^^^^
> > > av_transcode() OUT
> > > 
> > > What's the problem? Thanks a lot.
> > > 
> > > 
> > > Kind Wishes
> > > 
> > > Yours
> > > Chao.Guo
> > > 
> > > 
> > > 
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