While watching a movie tonight (guess what movie ?) I performed this very scientific test:
First, I created 2 Shotcut projects:
Each project have 16 tracks.
Each track have 16 identical image clips. So a total of 256 clips.
Each clip is 3 seconds long with a 1 second fade-in and a 1 second fade-out.
Each track have a 1 second delay from the previous one (except track 1).
Difference between the two projects? You guessed it : In without_fadeaudio.mlt I removed all Fade In Audio and all Fade Out Audio. I remind you that those were created automatically, but are not used since there is no audio in the clips.
Then I exported each project 3 times to see if removing the unused audio fades would make a difference.
First let’s look at the MLT (melt… melt… melt) files and the exported videos :
without_fadeaudio.mlt is about 200k smaller. Makes sense. 2 liters of unused water.
Both exported videos are identical. This also makes sense.
Now, let’s look at how long it took to export each project.
Export list of the project with the audio fade-ins and fade-outs :
Export list of the project where I removed the audio fade-ins and fade-out.
So, according to these results (and if the way I did the test is worth anything), it does make a difference when the unused audio fades are removed. But obviously, it’s not worth the time it takes to remove them just to save about 3 minutes of export time.