Quote:
Originally Posted by alex1399
If hard drive cost / data plan is the main concern, just compress them. Try x265 --lossless only for crystal clear video - Skip. Try x265 --cu-lossless for not-so-clean video - Skip. Noisy video, try sub-optimal encode that preserves the signal strength and mitigate the quans or phys interference as much as possible in the present first encoding process, and maintains the best visual quality by some futuristic state-of-art encoder in the second encoding process (perhaps forever away). Try x265 --tune SSIM / --tune PSNR.
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Lossless is almost certainly going to be higher bitrate than the original MPEG-2. Tune SSIM and PSNR will require a higher file size at the same subjective quality; neither metric is great at film grain. For noisy content post MPEG-2 --cu-lossless may not find a single block that it actually encodes differently. Encoding 8-bit source as 8-bit will be faster and identical quality and efficiency as 10-bit in HEVC; the efficiency improvement of 8-as-10 was really only in H.264.
Using --tu-intra 4 --tu-inter 4 can help preserve some small details in SD.
Also, if there is any visible blocking in the MPEG-2, using a deblocking decoder with conservative settings can help improve accuracy and make encoding easier. And make sure to inverse telecine to a clean 24p if possible; that'll cut bitrate as much as half versus doing 30i in HEVC.
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