CMake: add prefix 'AVTRANSCODER' to some flags

AudioTransform: fix AVPacket buffer resize

Only change number of samples if variable (i.e: MOV...).

Up to v0.5.1

Up to v0.5.0

Up to v0.4.3

Up to v0.4.2

Version: update to 0.4.1

Release note:
 - Fix missing frame when transcoding
 - Add getBitDepth method to VideoProperties

Up to v0.4.0

Update to v0.3.1

Fix AVRational in bindings.

Up version to 0.3.0