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carykh / jumpcutter

Automatically edits vidx. Explanation here: https://www.youtube.com/watch?v=DQ8orIurGxw
MIT License
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Help setting --silent-threshold #149

Open kyanhluong opened 4 years ago

kyanhluong commented 4 years ago

Hello, i have a lecture video that have a noise floor of -33dB, can someone help me find the corresponding silent threshold value to set it to ?

Lamaun commented 4 years ago

as carykh explained in the video the silent-threshold is relative to the maximum volume of the video. So we would need to also know this value if we wanted to calculate the threshold. As dB is a very weird logarithmic unit I am unsure if the internal amplitude representation uses it. So even if you gave the max value and the noise value the silent-threshold won't just be the ratio.

When I had a similar problem I just solved it by trial and error. For this purpose you should probably cut some short (maybe 5 minutes) part from the video and try your silent threshold there.

Tip: As lecture videos tend to be long I also recommend you to use a faster fork (any fork of https://github.com/torsrex/jumpcutter) together with a splitter skript (both forks of https://github.com/torsrex/jumpcutter come with one I think) because otherwise you will need a very big RAM (my 1:30h lectures needed more than 16 GB). The original jumpcutter doesn't need splitting but is very time intensive.