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

[Alex Cohn]

You must open the images in IrfanView via the menu "File/Open as RAW".
Then, choose 8 BPP grayscale for .y, .u, or .v. IrfanView has a radio
button to choose 24 bpp, with a checkbox for YUV 4:2:0, which will fit
your .yuv files.

Alex

On Wed, Jun 22, 2011 at 07:13, Amir Rouhi-Rmit <amir.rouhi at rmit.edu.au> wrote:
> 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
>> >
>> >
>> _______________________________________________
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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
>
>
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