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1st September 2013, 18:02 | #1 | Link |
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Join Date: Aug 2012
Posts: 28
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Quick x264vfw questions
Hello. I want to use x264vfw in lossless mode. My capture card uses the YUY2 colorspace. I have some questions:
1. Will selecting "Keep/Accept Only YUV 4:2:2" in the settings actually give me 4:2:2 sampling or is it still going to be 4:2:0? 2. Will selecting "Keep input colorspace" keep YUY2 with 4:2:2 sampling? 3. If 1 and 2 are yes, is there a difference as to what I select? The reason I ask is because with 1 and 2, MediaInfo reports the chroma sub sampling as 4:2:0 which confuses me. |
1st September 2013, 23:05 | #4 | Link | ||
Software Developer
Join Date: Jun 2005
Location: Last House on Slunk Street
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Quote:
In other words: You will either get YUV 4:2:2 or nothing at all. Quote:
Note that here it matters what the encoding application passes to the Codec, which is not necessarily the same what your input file contains! For example: In VirtualDub the pixel format that will be passed to the Codec is selected under Video -> Color Depth (on the right side). (BTW: YUY2 is only one specific way of storing YUV 4:2:2 data in memory. It's the exactly same information as, for example, UYVY (aka Y422/UYNV/HDYC) or YV16. They just differ in the memory layout.)
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2nd September 2013, 14:22 | #6 | Link | |
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Join Date: Jun 2005
Location: Last House on Slunk Street
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Quote:
The second option accepts any supported input format and keeps what ever that is - which might be YUV 4:2:2, but might be something else just as well. And remember: For the second option it does not matter what your original input video file contains. It does matter what the application passes to the Codec. (For example, VirtualDub converts the input video to whatever you have selected under "Video" -> "Color Depth" before sending it to the Codec)
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Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ Last edited by LoRd_MuldeR; 2nd September 2013 at 14:28. |
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