[Libav-user] How can i extract Y plane from any frame in video

[Amir Rouhi-Rmit]

I have downloaded the Irfanview as you told but still can not view the image
files with extension *.y or *.u or *.v.
BTW all image files with extension *.yuv which has been extracted by below
command:

ffmpeg -i input.wmv -r 1 -s WxH -f image2 -pic_fmt yuvj420p Img-%03d.yuv

the Irfan view detect them as Jpg and says it is an JPG image with wrong
extension.... whats your idea?


On Wed, Jun 22, 2011 at 1:38 PM, Alex Cohn <alexcohn at netvision.net.il>wrote:

> On Windows, download a free program called IrfanView.
> Alex
>
> On Wednesday, June 22, 2011, Amir Rouhi-Rmit <amir.rouhi at rmit.edu.au>
> wrote:
> > When i use the below command
> > ffmpeg -i input.wmv -r 1 -s WxH -f image2 Img-%03d.Y
> > i will get three different output file for each image which the
> extensions are Img-xxx.u and Img-xxx.v and Img-xxx.y
> > it seems that the command separate the picture of each frame to 3 plane
> y,u and v. But i cant view them to see the result. are they correct or not?
> Can you recommend a software for viewing this images with extensions *.y *.u
> and *.v?
> >
> > But when i use the command:
> > ffmpeg -i input.wmv -r 1 -s WxH -f image2 -pic_fmt gray Img-%03d.Y
> > the result contains like previous command , for each image three planes
> with *.y ,*.u and *.v which the size of *.u and *.v is 0.
> > how can i see the image of *.y resulted in this command and compare it
> with previous one? size in both are same and hex editor shows same content
> but i need to see the images. how to view them?
> > Tnx
> >
> > On Fri, Jun 17, 2011 at 8:37 PM, Stefano Sabatini <
> stefano.sabatini-lala at poste.it> wrote:
> > On date Thursday 2011-06-16 16:02:43 +1000, Amir Rouhi-Rmit encoded:
> >> I know that i can extract images of a video by ffmpeg as can be seen in
> >> below command:
> >> ffmpeg -i input.avi -r 1 -s WxH -f image2 Img-%03d.jpeg
> >> But what i want is a separated Y plane and cb and cr plane. can i i
> achieve
> >> this by ffmpeg? if yes pleas let me now how and if no do you suggest any
> >> idea?
> >
> > You may use the .Y raw image format:
> > ffmpeg -i input.avi -r 1 -s WxH -f image2 Img-%03d.Y
> >
> > to get separate .Y, .U, .V raw images. A possibly better solution
> > would be to use the lut filter, soon to be committed, and I suppose
> > you can achieve the same purpose using some of the MPlayer filters
> > wrapped by mp.
> > _______________________________________________
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> > Libav-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/libav-user
> >
> >
> > --
> > Amir H. Rouhi
> > PhD Student/ CSIT RMIT University
> > Room: 14-09-04
> > rouhi_amirhossein at student.rmit.edu.au
> > amir.rouhi at rmit.edu.au
> >
> >
> _______________________________________________
> Libav-user mailing list
> Libav-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/libav-user
>



-- 
Amir H. Rouhi
PhD Student/ CSIT RMIT University
Room: 14-09-04
rouhi_amirhossein at student.rmit.edu.au
amir.rouhi at rmit.edu.au
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