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umezawatakeshi / utvideo

Ut Video Codec Suite - fast lossless video codec
http://umezawatakeshi.github.io/utvideo/
GNU General Public License v2.0
288 stars 12 forks source link

There is no direct NV12 input, so the cpu had to transform it into YV12. IT is an unnecessary painful work for a lot of CPU #32

Closed Cuberlain closed 3 years ago

Cuberlain commented 4 years ago

Hi!

There is no direct NV12 input for UT Video, so the cpu had to transform it into YV12. NV12 is more common in cameras and camcorders than YV12 format, especially all famous camcorder and camera manufacturers (Sony, Panasonic, JVC, Canon) use only the NV12 color format, when they send the signal trough HDMI output in yuv 4:2:0 colorspace. It is a lot of CPU work to transform it to YV12, especially if you want to record video with a laptop. That unnecessary transform operation increases the CPU usage with 100-200 percent on many laptops , which has not dedicated strong videocards.

Can you make a YUV 4:2:0 NV12 version?

Thank you for your reply!

umezawatakeshi commented 4 years ago

I opened a same issue (#17) long ago, but I have left it undone for a long time.

Now I received your request, so it's time to implement it!

Cuberlain commented 4 years ago

so it's time to implement it!

Thank you Umezawatakeshi!

NV12 is similar to YV12 format in many respects. Maybe it can use the same compression method/technology. When will you implement it in the next release? I can try out test versions with pleasure.

Thank you for your reply!

Best wishes!

umezawatakeshi commented 4 years ago

It will be released in the next version, but I make no guarantee when the next version is released.

Cuberlain commented 3 years ago

Can you make a YV12 version too?

I often capture videos from 4k camcorders with Elgato Cam Link 4K in VirtualDub2, which have nv12 source video. However there are HSW colorspace problems, which can be solved by the so-called "swap U and V" transformation :(((

umezawatakeshi commented 3 years ago

I don't implement any workarounds for other buggy components (except OS itself). It is just a waste of my life.

Cuberlain commented 3 years ago

Hello Umezawatakeshi!

Addig an important new type of colorspace mode is a great update itself for a codecs. I can't wait :) When will you release the new version? If you have a dev. vesion , I can test it with pleasure!

Best wishes!

umezawatakeshi commented 3 years ago

In version 22.1.0, which is released just now, ULY0 and ULH0 support NV12 input/output.

Cuberlain commented 3 years ago

Thank you Umezawatakeshi!

It is good to see that Ut video is better than MagicYUV, and Ut video also support more color formats.