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By default H263 is limited to CIF however with some small changes you should be able to enable 4CIF and 16CIF. Look at h263CodecDefn in h263ffmpeg and look for the 4CIF H.239 encoder and decoder definition (4CIF is enabled for H.239) you can use this as a basis to define a 4CIF video capability by m...

You should redirect technical questions to the h323plus mailing list. http://lists.packetizer.com/mailman/listinfo/h323plus Compiling the X264 on windows is a real pain. You can use this precompiled version. http://www.h323plus.org/source/download/ffmpeg_x264.zip Extract into the same directory as y...

try adding a reference to oleaut32.lib

When Introducing a new codec into H.323 (not just h323plus) you have decide whether its a non-standard or generic capability. H.261 and H.263 are standard capabilities H.264 (although standard) is a generic capability. h323plus has better support for generic rather than non-standard. A generic capab...

The trace above is for Opal not H323plus. Both libraries use the ptlib base library. Anyway unlike a console application you need to set the environmental variable PTLIB_PLUGINDIR to point to the directory you have placed the plugins in. Note the X264_helper should remain in the same directory as yo...