New answers tagged editing
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Remove -vf scale=800:-1 to avoid rescaling. Remove -r 20 to avoid changing frame rate. You're transcoding from a stream in a MP4 to the GIF codec, so the bitrate will not remain the same, nor is there any sense in trying to keep it the same.
A stream is scaled by using the scale filter in a simple filterchain -vf or a complex filterchain -filter_complex or ...
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Also, these days you can use this nice crossplatform GUI tool LosslessCut (with FFmpeg under the hood).
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I would use Davinci Resolve to do this.
It is free, runs on windows, and has great object removal tools.
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I don't know if FFmpeg supports the Camstudio Lossless Codec, but if it would. Then replacing the area with a PNG file (hence: adding a logo) could be a solution.
The explanation is done here at "Timing the overlay".
https://superuser.com/questions/683643/how-to-add-my-logo-for-the-first-30-seconds-in-a-video-with-ffmpeg
In that example codec:a ...
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When you record each track, make sure that the level never goes up to zero on the meter. If it hits zero, it means that the recording is clipping. Clipping is when the computer can no longer accurately record the waveform. So instead of recording the shape of the wave, the upper and lower limits of it will be clipped in a straight line. So a tone sound ...
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