The main problem is that with most video compression formats, the compression techniques used for I-frames usually differ from those used by other frames such as P-frames, such that below a certain quality threshold, the artifacts introduced by the two frame types can differ by quite a lot. optical media, live streams) and only to aid seeking/trick-modes and/or stream switching (and there are techniques other than using regular I-frames to deal with that). Petteri Aimonen ( talk) 21:32, (UTC) Reply I-frames need to be placed at regular intervals only on some transports (e.g. Arnero ( talk) 12:49, (UTC) Reply I think it is because I-frames often occur at set intervals, so you cannot just add an I-frame where a transition occurs. Then after the woosh or the transition effect an I frame would be inserted and the frames would be predicted into the woosh or the transition effect from both sides. I can image special situations like transition effects in a NLE or something woshing across the screen possibly blurred and too close the camera. To me it is not clear why one or some B frames before the next I-frame improve compression, generally. Since I don't entirely understand this article, I feel severely under qualified to be the one that does this. I have tried to sort of link this into the video codecs article, and this article, honestly, should probably make its way at least in summary form onto that page as well. Mulligatawny 22:21, 5 October 2006 (UTC) Reply Maybe one article or another (or both) could use some improvement, and perhaps the video compression article should contain some reference to this article and vice versa, but merging those articles doesn't sound like the right way to accomplish the improvement. Many wavelet-based or 3-D transform video compression designs do that. It is possible, for example, to do interframe compression without using I, P or B pictures. I also simply oppose the merge suggestion (agreeing with AlyM above). move the video_compression#Intraframe_vs_interframe_compression section of the video_compression article into the B pictures article, leaving behind a short summary and a Template:Main link to the B pictures article.move the B pictures article into the video_compression article, and make B pictures a redirect into the video_compression article.If they are distinctly different things, then yes, they need different articles.īut I fail to see the difference between "intraframe and interframe compression" and "I pictures, P pictures, and B pictures". A merge tag has just been added to this article suggesting it be merged with video_compression#Intraframe_vs_interframe_compression, I'm just noting that I feel that the topics of this page are distinct enough that the warrant being separate.
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