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Video scaling in ffmpeg causes audio gaps

I am trying to scale down a video (mp4 format) by using the following process : Segment the video ffmpeg -v quiet -i <input-file> -map 0 -c copy -f segment -segment_time <segment_length> -reset_timestamps 1 -avoid_negative_ts make_non_negative output_%03d.mp4 Scale down each segment parallelly ls output_*.mp4 | parallel ffmpeg -v quiet -i {} -vf scale=-2:<output-resolution> temp_{#}.mp4 Join […]