Properly capture and encoding to yv12 colorspace

[SerbianBoss]

I want to capture tape from digital camera to computer in yv12 colorspace. I am in pal country, file is DV avi interlaced, 25 fps.

I know that Pal using yv12 colorspace. And when capture to dv is better to decode to yv12. So i am using cedocida dv codec with yv12 option. So when transfer to computer, if i that file load in CCE does my encoded file be yv12 ?(becasue i know that cce work with yuy2).

Or what happened if i that dv file load in Pinnacle studio or Sony vegas, does colorspace still be the same yv12 ?

[SerbianBoss]

any comment?

[manono]

Hi-

This isn't really my speciality, so don't ask anything any harder than this. If at all possible, you want to cap in YUY2, if it's going to CCE for encoding. If you don't, and don't convert it to YUY2 in your script, CCE is going to convert it to YUY2 anyway. CCE will output YV12. You can check the video (colorspace and many other things) at any stage by creating a script for the video, adding Info() at the bottom, and then opening it in VDubMod.

[jagabo]

I know that Pal using yv12 colorspace. And when capture to dv is better to decode to yv12. So i am using cedocida dv codec with yv12 option. So when transfer to computer, if i that file load in CCE does my encoded file be yv12 ?(becasue i know that cce work with yuy2).

If you open the DV AVI file in CCE, and Cedocida is set to output only YV12, then CCE will receive YV12 from Cedocida. If CCE doesn't have the "Try decoding in YUY2 format" option enabled, you will get an error message when you try to encode: "unkown format 0x32315659". 0x32315659 = YV12.

With the option enabled it compresses the video without any problems but opening the Picture Quality dialog gives the same error (the dialog continues to run). Everyone says CCE works in YUY2 internally so maybe that's why. If that's the case, CCE converts to YUY2 for its filtering, then back to YV12 for MPEG compression. You might see some differences between having Cedocida do the YV12-to-YUY2 conversion vs having CCE do it (are the U and V samples duplicated or interpolated?). Try both options and see if there's any difference in the final output.

Or what happened if i that dv file load in Pinnacle studio or Sony vegas, does colorspace still be the same yv12 ?

If they use VFW to decode DV AVI files, those programs will receive the video from Cedocida in whatever format you specify for the output in Cedocida. I don't know what they do with the video after that.

[SerbianBoss]

I just want to properly capture to yv12 and to encode to yv12. IF cce cant do this(because work in yuy2) which encoder can take yv12 dva vi file and then encode to mpeg2 yv12?

[manono]

IF cce cant do this(because work in yuy2) which encoder can take yv12 dva vi file and then encode to mpeg2 yv12?

HCEnc

[jagabo]

I just want to properly capture to yv12 and to encode to yv12. IF cce cant do this(because work in yuy2) which encoder can take yv12 dva vi file and then encode to mpeg2 yv12?

Why are you so concerned about conversion between YV12 and YUY2? There isn't necessarily any loss of quality from that conversion. It's mostly just a rearrangement of the Y, U, and V components.

four YV12 pixels:

Y1 Y2
Y3 Y4

U1

V1

converted to four YUY2 pixels:

Y1 U1 Y2 V1
Y3 U1 Y4 V1

[SerbianBoss]

@jagabo

thanks for info.

Questions about HC

1. IF we have interlaced material does we need to select "interlaced" in miscellaneous

2. Scan method- need to be alternate for interlaced material

3. CPU-is better to select auto or SSE3(because my cpu support sse3)

4. In matrix option is better to select built in matrix or custom matrix

thanks

[manono]

1. Yes
2. Yes
3. I don't know. I kept mine at auto. It should be able to detect it, I think.
4. I usually use a custom matrix. It kind of depends on how much space you're allowing and how well the material compresses. Check the average quant when done. That's a good indication of quality, and whether or not you allowed enough space, or chose the proper matrix for the file size.