Cleanup: crossfade, muxer rewrite, fix add · savonet/liquidsoap@0511f1b

Run tests: FFmpeg filter with changing video rate#L1

Ran test FFmpeg filter with changing video rate: [skipped]

Run tests: FFmpeg add text filter test for @ffmpeg[format='mp4'#L1

Ran test FFmpeg add text filter test for @FFmpeg[format='mp4',@Audio[codec='aac',channels=1],@video[codec='libx264']].mp4: [skipped]

Run tests: FFmpeg raw+encode decoder test for @ffmpeg[format='mp4'#L1

Ran test FFmpeg raw+encode decoder test for @FFmpeg[format='mp4',@Audio[codec='aac',channels=1],@video[codec='libx264']].mp4: [skipped]

Run tests: FFmpeg add text filter test for @ffmpeg[format='mp4'#L1

Ran test FFmpeg add text filter test for @FFmpeg[format='mp4',@Audio[codec='aac',channels=2],@video[codec='libx264']].mp4: [skipped]

Run tests: FFmpeg raw+encode decoder test for @ffmpeg[format='mp4'#L1

Ran test FFmpeg raw+encode decoder test for @FFmpeg[format='mp4',@Audio[codec='aac',channels=2],@video[codec='libx264']].mp4: [skipped]

Run tests: FFmpeg add text filter test for @ffmpeg[format='mp4'#L1

Ran test FFmpeg add text filter test for @FFmpeg[format='mp4',@Audio[codec='aac',channels=2],@video[codec='libx264',r=12]].mp4: [skipped]

Run tests: FFmpeg raw+encode decoder test for @ffmpeg[format='mp4'#L1

Ran test FFmpeg raw+encode decoder test for @FFmpeg[format='mp4',@Audio[codec='aac',channels=2],@video[codec='libx264',r=12]].mp4: [skipped]

Run tests: ffmpeg_inline_encode_decode_audio.liq#L1

Ran test ffmpeg_inline_encode_decode_audio.liq: [skipped]

Run tests: ffmpeg_inline_encode_decode_video.liq#L1

Ran test ffmpeg_inline_encode_decode_video.liq: [skipped]

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