n3.4.14
avformat/tests/gitignore: add fifo_muxer entry
avformat/test/fifo_muxer: add check for FailingMuxerPacketData alloc
movenc-test: Add tests for negative cts offsets
Merge commit 'a6a750c7ef240b72ce01e9653343a0ddf247d196'
Merge commit '537b5b773b317af79d3a5b576ee9683e15ed84f6'
ffmpeg, ffprobe: don't "merge" side data into packet data by default