Add getters for number of decoded or generated frames

Fit to FFmpeg 5.x API

Fix video filters (after audio filters memory leak fix)#324

Fix audio filters memory leak#323

Fix: stop the process even if the wrapper expects more data#322

Fix video filter graph memory usage#319
Fix codec latency in positive offset#320

• Fix some deprecation warnings
• Fix Java binding for InputStream::addPacket()
• Fix AudioGenerator usage after transcoding
• Fix number of samples computing into AudioProperties

• FFmpeg 4 support
• Custom encoder can be specified to the Transcoder streams
• Add audio phase meter application

• Fix filter graph memory usage (unreleased v0.14.1)
• Correctly retrieve the file size on 32 bits OS (unreleased v0.14.2)
• Fix SWIG uint64_t type handling
• Fix travis CI