Is it possible for ffmpeg to display a progress bar?

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Yes, ffmpeg can display a progress bar during the encoding process. To display the progress bar, you can use the -progress option followed by a URL. For example:

ffmpeg -i input.mp4 -c:v libx264 -c:a aac -progress http://localhost:8080/progress.m3u8 output.mp4

This will display the progress bar at the URL http://localhost:8080/progress.m3u8. You can then view the progress bar in a web browser or a media player that supports HLS (HTTP Live Streaming) protocol.

Note that the progress bar will only be displayed during the encoding process and will disappear once the encoding is complete.