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I answer myself: I found a question related and I thought I could pipe ffmpeg to ffplay. It works partially (you can watch the merged video), but you can't seek (and it chokes the CPU). ffmpeg -i BACKGROUND -i OVERLAY -filter_complex [0][1]overlay=100:100 -f matroska - | ffplay - But I didn't even think that ffplay could be used and, though ffplay only ...


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If you generate a fragmented MP4, you can view the video as it is being encoded. You can only seek upto the points which have already been encoded at the time of loading the file. So, if you want to seek further, reload it later. Basic syntax is ffmpeg -i input -<encoding parameters> -movflags +frag_keyframe+separate_moof+omit_tfhd_offset+empty_moov ...


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Your answer is in your question. VLC: Preferences, Audio, tick option "Normalize volume to:". And you get "per video file volume normalization on the fly during playback". It is dynamic normalization. So it calculates loudness of chunk, something like 10 seconds. And amplify it to marked in option value. Every decent videoplayer has this option. It is ...



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