Dual-Pass Encoding needn't create a video file on pass 1

What is your operating system?

Not material, but macOS Sierra.

What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?

64-bit 20-06-14

Can you repeat the problem? If so, what are the steps?

Export using dual-pass. I’ve used the settings in the attached screenshot, but my guess is this is generic for any dual-pass encoding.

Dual-pass encoding using these settings produces a huge first-pass video file. I’ve encountered this with other apps too.

There’s no need for this. The 2nd-pass only needs the log files. The first pass output should be going to /dev/null.


I have this working in a branch and will include it in the release after next. The next version 20.07 is only for critical bug fixes.


Thanks for that very swift response, Dan. And thanks, more than anything, for Shotcut.

(/dev/null is one of the very greatest Unix inventions. Microsoft should use it more often. For much of its code.)


This works on Window as well by using “nul.”

1 Like

…and the slashes round the wrong way! Such fun.

(For the avoidance of doubt, I was suggesting that the bit bucket might be the best place for Microsoft to put much of its code.)


Why would they use BitBucket when they bought GitHub? :wink:

Thanks, Dan. Lousy joke, but excellent Shotcut. Keep showing us the way!


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