Most interesting open source

[Manao]

AFAIK, some scalability schemes in SVC make it more efficient than AVC, and definitely not a loss of 15/20%

[mikeytown2]

Going back to the original question, AvsP (http://forum.doom9.org/showthread.php?t=129385) could use a Dev. X264 (http://x264.nl/) would impact the most people IMHO. Also in case anyone is wondering, SVC on wikipedia (http://en.wikipedia.org/wiki/Scalable_Video_Coding). Multi Threading AviSynth (http://avisynth.org/mediawiki/Changelist_25-26) is another good one.

[CruNcher]

Avidemux could need more Devs it's on a very good way (some more Avisynth Filters ported) maybe even someone would be so crazy working on frame accurate seeking and the ultimate chalenge then would be a Non linear Workflow :)

[akupenguin]

H.263 style OBMC is 4 shifts and 3 adds per pixel ... what's the problem?
...Plus motion compensating each pixel 4 times (8 times in B-frames) to compute the inputs to the overlap filter. Still isn't absolutely horrible if your motion compensation is bilinear hpel, but 8 calls to 6tap qpel is hella slow.
(The decoder wouldn't actually compute 8x 6tap, it'd switch to the encoder-like method of compute 3x 6tap and store all of the intermediate values, taking 4x the memory. But it's still a whole bunch of pavgb, and the memory impacts speed too.)

[LoRd_MuldeR]

Avidemux could need more Devs it's on a very good way (some more Avisynth Filters ported) maybe even someone would be so crazy working on frame accurate seeking and the ultimate chalenge then would be a Non linear Workflow :)

I second that :)

Things in Avidemux that deserve attention:
* It lacks frame-accurate support for H.264, which hopefully can be achieved by porting code from DGAVCIndex.
* x264 integration still is not perfect - various options are missing and the new b-frame patch causes trouble
* MP4 output seems to be broken in recent builds and even didn't work very well before that

Porting new Avisynth filters to Avidemux or adding new Encoders/Decoders should become much easier with Avidemux 2.5 and it's Plugin system ;)