Hello, Does anyone know the answer to this question below? (Note... they're calling the Theora codec "Ogg" below. I know technically it's not correct... but that's what some are calling it.) ---------- Forwarded message ---------- From: Enric <enric.media@gmail.com> Date: Aug 19, 2007 10:13 AM Subject: [show-in-a-box] Re: Ogg To: show-in-a-box@googlegroups.com A question I have if you would know. OGG from what I know comes from an early version of the Flash codec that ON2 is building. The FLV file structure does not have frames, but only keyframes, to optimize for streaming -- that's why FLVs can't be edited in Premiere or Final Cut. Does OGG have a similar limitation of not being fame editable and only having keyframes? -- Enric
On 8/19/07, Charles Iliya Krempeaux <supercanadian@gmail.com> wrote:> ---------- Forwarded message ---------- > Does Theora have a similar limitation of not being fame editable > and only having keyframes?No, I don't think so. I believe Kino and Cinelerra (sic?) edit Theora just fine. The FLV format is quite different from Ogg.
On Sun, Aug 19, 2007 at 03:11:40PM -0700, Charles Iliya Krempeaux wrote:> (Note... they're calling the Theora codec "Ogg" below. I know > technically it's not correct... but that's what some are calling it.)There are a number of confusions. Theora is a keyframe-based codec, as are h.263 and On2's VP6, the two codecs supported by Adobe's flash player. None of these can be cut losslessly outside of keyframe boundaries. A good editor (or clip trimmer) will do minimal re-encoding on such streams, just as it will on other modifications requiring re-encoding, like transitions and effects. A cruder solution is just to transcode the entire stream to all-keyframes, either in the same format or a different one (like dv or mjpeg). This greatly increases the storage requirements, which is why the trade-off of editability for keyframe- based compression was made in the first place. So, Theora (in the Ogg container) is no more or less editable than flv. HTH, -r