WMV File with YUY2 Raw Video Format

[toreachdeepak]

Hi,

We have WMV Files but we need files with YUY2 raw video format.

Does normal WMV files has RGB raw video format ?

Regards

Deepak

[poisondeathray]

WMV is usually YV12

What application are you using that requires YUY2?

You could use avisynth can convert it to YUY2 to feed it into your application, or you could encode to a lossless YUY2 intermediate e.g. using UT codec, or I think even Lagarith or some others lossless codecs

[Safesurfer]

Have a read of http://www.microsoft.com/windows/windowsmedia/howto/articles/AdvancedEncoding.aspx

Capturing to Optimal Pixel Formats
It is recommended that you capture to a YUY2 (4:2:2) pixel format, which enables you to avoid pixel format conversions during encoding. The Windows Media Video 9 Series codec is primarily a 4:2:0 pixel format, except that if you choose to maintain the interlacing in your content (a new feature with Windows Media Encoder 9 Series), then a 4:1:1 pixel format is used. Because the YUY2 format is a superset of both 4:2:0 and 4:1:1 pixel formats, the content can be converted to either format without any data loss.

An important note is that if you capture to a 4:2:0 AVI file (for example I420, YV12, or IYUV), you will not be able to maintain the interlacing in your source video.

Older capture devices may create AVI files that do not fully conform to published specifications, resulting in upside-down video with the YUY2 pixel format. To prevent this, you can either set the driver on your capture device to use a different pixel format, or you can "flip" the image if your driver provides such a feature. Finally, there is also an option to flip the video in the encoder.

The RGB pixel formats are not recommended, because they result in extra color-space conversions, bigger files, and more data to move across the bus.

If you are encoding WMVs, WME has an option in the Processing tab of the Session Properties to set the pixel format.

[hrmill]

If you want to check what is inside the raw video files, you can use 7yuv app (link from my signature).

It is a raw image file viewer, which understands many raw YUV video formats.