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On 22/12/2021 16:17, Grant Edwards wrote: |
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> On 2021-12-21, Laurence Perkins <lperkins@×××××××.net> wrote: |
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> |
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>> Note that some editing software can only cut at the iframes, and |
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>> it's also fairly common to only be able to cut at the iframes unless |
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>> it's re-encoding the data. |
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> |
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> AFAIUI, it's not even theoretically possible to cut anyplace other |
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> than the I-frames without decoding and reencoding at least the portion |
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> of the stream where the cut is being made. While it might be possible |
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> to copy the rest of the stream, I don't know of any editors that will |
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> do that. |
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> |
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What is an i-frame? As I understood it, typically when you had a scene |
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change, a frame was written in full, then subsequent frames were stored |
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as diffs. Is that what an i-frame is? |
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In which case, surely it can't be that tricky to delete a block without |
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having to decode/encode more than a few frames? |
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And how come PVRs do it so easily? |
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Cheers, |
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Wol |
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