Hi Monty, I'm a different Anonymous, but share the same feeling as him/her about P/I-frames. When I observe video artifacts they sometimes seem to vanish abruptly. I guess an I-frames reset the error accumulated so far. I wonder if its worth to explore the following idea to remove the need for I-frames: If I-frames are analogous to single samples in one dimensional signal processing, then P-frames are analogous to back-differences. To reconstruct original samples from back-differences a Integrator is needed. If there is error in the differences then the error accumulates in the integrator without bounds. Sometimes a "leaky Integrator" is used, that decays to zero if the input is zero. If there is noise in the differences the error accumulation in the leaky integrator is more bounded. An exact inverse of the leaky integrator exist. I don't know if it also has a name, let's call it a "leaky difference". If I understand correctly P-frames store block motion and residuals and B/I-frames are there to reset a "build up" of artifacts. Could B/I-frames be dropped, if the block residuals in P-frames were more "leaky"?
Thank you for writing the Demo Pages, I enjoy their audiovisual/interactive presentation.
rather vague idea towards removing the need for I-frames
Date: 2014-12-26 08:20 am (UTC)I'm a different Anonymous, but share the same feeling as him/her about P/I-frames. When I observe video artifacts they sometimes seem to vanish abruptly. I guess an I-frames reset the error accumulated so far. I wonder if its worth to explore the following idea to remove the need for I-frames:
If I-frames are analogous to single samples in one dimensional signal processing, then P-frames are analogous to back-differences. To reconstruct original samples from back-differences a Integrator is needed. If there is error in the differences then the error accumulates in the integrator without bounds. Sometimes a "leaky Integrator" is used, that decays to zero if the input is zero. If there is noise in the differences the error accumulation in the leaky integrator is more bounded. An exact inverse of the leaky integrator exist. I don't know if it also has a name, let's call it a "leaky difference".
If I understand correctly P-frames store block motion and residuals and B/I-frames are there to reset a "build up" of artifacts. Could B/I-frames be dropped, if the block residuals in P-frames were more "leaky"?
Thank you for writing the Demo Pages, I enjoy their audiovisual/interactive presentation.