Fix PTS continuity in sequences of copied streams. · savonet/liquidsoap@945da08

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

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

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

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

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

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

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

Ran test ffmpeg_inline_encode_decode_audio.liq: [skipped]

Ran test ffmpeg_inline_encode_decode_video.liq: [skipped]

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