Capture YUV with HuffYUV

[smartel]

i'm trying to capture YUV (yuy2) ,
both Virtualdub and MMC 9.03 gives me RGB colorspace in mediainfo ?
and my test with mjpeg gave me YUV ok
is HUFFY RBG still better than Mjpeg YUV !??
capture settings for vhs to dvd for convolution3d , who needs YUV i think for it's temporal fonction

Happy Holidays

[jagabo]

Make sure HuffYUV isn't set to output RGB (disable the "Always suggest RGB..." option). When you're capturing make sure your the capture device is set to output YUY2, not RGB. That's usually set in the Video Capture device driver. In VirtualDub you usually get to it by Video -> Capture Pin... there should be a Color Space pulldown there.

[smartel]

i've done that multiple times and carefully review each option always get RGB output , just tried virtualvcr and it's the same thing . is it because i'm doint the tests with my card's tv tuner ? all-in-wonder ve

[jagabo]

Are you sure HuffYUV is doing the decoding? Some other decoder (ffdshow?) could be decoding HFYU.

Do you know how to use AviSynth? If so, open your video in AviSynth and use the Info() command to see what colorspace is coming out of the HFYU decoder:

AviSource("filename.avi")
Info()

All capture cards first capture as YUV because that's what's in an analog video signal. Only if RGB is requested do they convert to RGB in the driver.

I just took a look at what MediaInfo reports for HuffYUV encoded AVI files. It always seems to report RGB, even though the uncompressed frames coming out of the decoder are YUY2.

[smartel]

interesting i'll try that and see

[smartel]

yes it worked thx

[jagabo]

the point to my question is capturing RGB(via huffy) that bad ?? is it better than capturing mjpeg ?

It depends. If the YUV video contains luma values outside the 16-235 range those sections will be crushed by the conversion to RGB. There will be no possibility of restoring detail in the very dark or very light areas. If your video doesn't have pixels outside that range conversion to RGB only causes a minor loss of precision. Much less of a problem than compression with a lossy codec like MJPEG (unless you're using a lossless MJPEG).

[smartel]

i know PicVideo at setting 20 is a lossless-like setting . i don't know if thats close to a lossless MJPEG

[jagabo]

i know PicVideo at setting 20 is a lossless-like setting . i don't know if thats close to a lossless MJPEG

No, PicVideo's regular MJPEG decoder isn't lossless, even at 20. They do have a truly lossless MJPEG codec though.

Be careful about what Lossless means. For example, HuffYUV is lossless if you feed it YUY2. If you feed it RGB and use the RGB->YUY2 conversion option it is not lossless. There is a loss going from RGB to YUY2, then the YUY2 is saved losslessly. Meaning that YUY2 output from the codec is is exactly the same as the YUY2 that went in, but RGB output is not exactly the same as the RGB that went in. Many other codecs have similar issues. If I remember correctly PicVideo's MJPEG encoder has the options of 4:4:4, 4:2:2, and 4:2:0 encoding internally. 4:2:2 and 4:2:0 will lose color resolution when feeding it RGB sources.

[smartel]

my signal path will be JVC HR-S5800U / DATAVIDEO TBC-1000/ ATI AIW VE

captured with MMC 9.03 ; avisynth to TMPGE i shoul be able to stay YUY2 and do the conversion in avisynth

[jagabo]

Doesn't TMPGEnc always convert to RGB before encoding? At least, it used to. By then your video should be within proper luma limits so it shouldn't matter much. Some AviSynth filters require YV12.

[smartel]

i'll capture crop , in avisynth ajust the crop , convolution3d et resizing and reconvert to RBG
i'll soon get some live tapes we did went we were younger, music shows some may be 2nd generation
those tapes are old enough to vote now

[smartel]

i'll capture crop , in avisynth ajust the crop , convolution3d et resizing and reconvert to RBG
i'll soon get some live tapes we did went we were younger, music shows some may be 2nd generation
those tapes are old enough to vote now
if i see that some of these tapes look very good i may capture direct to mpqg2 a little videosoap and highest bitrate for dvd , i'll work on the audio seperately ,