I wonder if someone could point me in the right direction. My Panasonic Lumix camera seems to create 4 audio tracks by default in its .MOV format. With my on-board stereo microphone, output is a mono left channel, a mono right channel and two null (present but with no audio) channels. When I load Lumix footage into ShotCut I am getting what appears to be one of the channels duplicated or a mono mixdown of both. The vertical L and R mixer bars are always identical. When I export to MP4 and look at the output in e.g. Resolve it’s the same duplicated signal. I can delete tracks 3 and 4 in Resolve and pan 1 and 2 left and right respectively, but had hoped the ShotCut might have been able to bypass that process.
I found a solution by using FFMPEG directly. Example:
FFMPEG -i InputFile.MOV -filter_complex “[0:a] join=inputs=2:channel_layout=stereo” -vn StereoAudio.wav
ffmpeg -an -i InputFile.MOV -c copy videoonly.mp4
ffmpeg -i videoonly.MP4 -i StereoAudio.wav -c:v copy -c:a aac -map 0:v -map 1:a outputfile.mp4
FFMPEG must be installed on your device, admittedly. .MP4 doesn’t support .WAV audio, but aac (lower case) is okay. Filenames may be substituted as necessary.
Thanks to Singularity Club and trac.ffmpeg.org
Did you know that the Shotcut package includes ffmpeg.exe and related executables such as ffprobe and ffplay
Dan and I were just talking the other day about how we should add more audio matrix and downmix filters.
Try changing the clip’s Properties > Audio > Track to All.