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h264 is a delivery format.. always capture lossless, edit and convert after
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"Lossless" can only mean one thing . It's a binary yes or no classification. When decoded/decompressed , the input and output are identical in every way . You can measure PSNR , look in a hex editor, measure differences (e.g. 2 layers in an editor in subtract or difference mode)
A difference in chroma subsampling, by definition means it's not lossless
In the uncompressed state, bitrate will always be the same, because they are the same pixel format. Same bit depth, same color model (e.g. YUV vs. RGB) , same chroma subsampling
In the compressed state, the lossless compressed bitrate can be very different. You can use higher compression (smaller filesizes, more difficult to decode/encode) , or lower compression (higher filesizes, easier to encode/decode). Long GOP lossless (temporal compression) can easily produce files 1/2 the size of huffyuv or lagarith . But for capture, people tend to go with intra compressed (I frame only) formats, because it's less likely to drop frames, and it's easier for real time capture . You can choose just about anything, any combination with AVC/h264, it's a very versatile format
4:2:2 is common for SD capture, regardless of format choice. The main issue is how some other programs handle interlaced chroma , add 4:2:2 avoids many of the issues. It usually has nothing to do with the actual quality , or measurable line pairs of chroma information resolvable detail
h264 is less common for capture in the past, because of higher encoder/decoder requirements. It's perfectly fine for SD on a computer less than 10 years old. Basically a dual core is safe. -
I capture VHS with 4:2:2 - interlaced - x264 regularly. I don't even use it for lossless, as x264 lossless isn't even the best out there. But it's good at lossy and modern CPUs can handle it.
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Note: When you do use an encoder with a bitrate setting it's in the encoder's configuration dialog: Video -> Compression... -> select encoder -> Configure button.
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What is the ramification of capturing interlaced fields to a progressive H264?
Since the encoder treated the source as progressive, my first thought is that the encode
is compromised in some way.
You can still separate the fields, but what about the overall integrity of the encode? -
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