[FFmpeg-user] How to download video stream starting at an earlier time?

Bo Berglund bo.berglund at gmail.com
Mon Aug 16 09:57:09 EEST 2021

Is it possible to download a live video stream on youtube using ffmpeg such that
it starts *earlier* than current time and lasts for a set time?

If I use a browser I can start the viewing at an earlier time by two ways:
1) I open the video URL and then I drag the right side of the progress bar left

2) I modify the video URL by adding ?t=3600 to the end and it will start playing
1 hour from the start of the stream.

I would like to be able to download a playing live stream section starting at
3650 seconds from the start and lasting for 600 seconds in mp4 format.

What would the ffmpeg command to accomplish this look like?

Bo Berglund
Developer in Sweden

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