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Originally Posted by NotsafeforNick
so many people say different things
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That because it can be a case of blind leading blind. Somebody with bad knowledge tries to pass on that bad knowledge. Kudos to you for seeing problems with that.
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These are both lossless, essentially identical in quality, the difference is in data structure and data (non-visual) compression. Lagarith can induce dropped frames from higher CPU overhead needs, even on modern hardware (per-core used, not whole CPU).
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3. What settings to use for converting that footage to 60fps and upscale it to HD for viewing on youtube/Instagram etc
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Use Hybrid (Avisynth). QTGMC to deinterlace to 59.94fps ("60fps").
After deinterlace, upscale with Hybrid (Avisynth).
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4. what compression codec to use for output that produces a high-quality, low-size file.
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H.264, high CRF, 422 profiles to retain chroma.
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Since I'm transferring with a DV port with a firewire card for both HI8 in a D8 camera and MiniDV, is all of this even necessary? I read that with DV transferring that since it's already digital there's no point in using a lossless codec since it's already compressed
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The Hi8 played in D8 camera can be forced DV out (yuck) or not (good). When good, transfer thast analog with
VirtualDub. Otherwise you crush quality, lose color, add blocks, etc. DV shot is fine, DV conversion is ugly.