this post was submitted on 14 Jun 2024
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Lossy encoding only happens once in both cases.
How direct import-export works: input file -> lossy format decompressor of editor -> filters -> lossy format compressor of editor -> output
How external codecs work: input -> external lossy format decompressor -> intermediate representation(lossless codec, can be just storing raw frames) -> IR decoder of editor -> filters -> IR encoder of editor -> external lossy format compressor -> output
Both options have only one lossy step - lossy encoder. Or technically two - also filters, but this is editor's intention.
Oh, I get it now, you mean using a lossless format as intermediate. Well, it would work but still it would be better if they didn't require this extra work on linux.