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As for fast forward and rewind while seeing the current scene, we did this back in the days of the VCR. Are they claiming to have invented that?
by coreyp_1 3y ago
As for fast forward and rewind while seeing the current scene, we did this back in the days of the VCR. Are they claiming to have invented that?
- themoonisachees 3y agoA VCR would simply display the frames that happened to pass by the read heads while rewinding. When doing that digitally, your codec decides if that is even feasible. If the codec optimizes for disk space, generating any frame requires going through all previous frames. If the codec optimizes for fast scrubbing, the file must contain redundant information and thus be larger. Nokia is claiming that h264's checkpointing mechanisms allow for that (empirically, this is indeed a feature of h264) and it is therefore their invention. I'm unaware if previous codecs had similar mechanisms. It would be wierd of none had, but it wouldn't surprise me that much.
- brucethemoose2 3y agoMPEG2 has I, P, and B, frames, so unless they "refreshed" the patent is somehow old, someone at Nokia just came up with the scrubbing idea using the existing implementation. ...But video players have had scrubbing bars for a long time? I'm not sure how long, my memory on Windows on XP and older is fuzzy.
- IshKebab 3y ago> generating any frame requires going through all previous frames No it doesn't; that would be crazy. There are keyframes that can be decoded independently of any other frame. They're usually every few seconds at most, which is fine for scrubbing.