However, this took an inordinate amount of hard drive space. WAV file and writing a program that compares frames and audio volumes and removes the parts I want removed and then reassembling what's left into a video. I have been able to do this in the past, but only by exporting the entire video as a series of images and the audio as a. I would like to remove these duplicate frames so the final video actually plays faster during these times, and at the same time remove the quietest audio adjacent to the removed duplicate frames so the audio does not go far out of sync. Because they are simulations, even when well-optimized there are often framerate drops when the simulation becomes too computationally intensive for the hardware. That should be used with care in the general case for the reasons mentionned above (prevent overloading).I am working with gameplay footage from simulation games. I couldn't find a definitive description of the processes involved when using the -ac option, but on the AudioChannelManipulation page, you can find the following sentence :įfmpeg integrates a default down-mix (and up-mix) system that shouldīe preferred (the -ac option) over the pan filter unless you have veryģ - For a 2 channel input to a 1 channel output, it seems that : ffmpeg -i out.wav -filter:a "volume=3dB" -ac 1 back.wav The goal is that the perceived loudness remains coherent.Īs mentioned by you can use the pan filter to keep input file level untouched : ffmpeg -i test.wav -af "pan=stereo|c0=c0|c1=c0" out.wavĢ - It seems that FFmpeg attempts to lower each of the contributing mono signals to prevent the sum to be over maximum level in the destination track.
1 - It seems that FFmpeg attempts to respect a common pan law (when routing a centered mono track to a stereo track, lower the mono signal by - 3 dB on each channel of the stereo track).
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