Update downloader.py

[rootDEV2990]

Set default fallback audio bitrate when no abr (assume available Bir rate) is found or null. from else "copy" => else "320k"

Title

Missing fallback bitrate

Description

ffmpeg was failing when no bitrate was sent it was receiving "copy" vs bitrate and ffmpeg needs -c for copy. changed else to fall back to 320k

Related Issue

#2364

Motivation and Context

ffmpeg will not make output file as script doesnt have fallback bitrate

How Has This Been Tested?

cli python3

Types of Changes

• [x ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [ x] My code follows the code style of this project
• [ ] My change requires a change to the documentation
• [ ] I have updated the documentation accordingly
• [ ] I have read the CONTRIBUTING document
• [x ] I have read the CORE VALUES document
• [ ] I have added tests to cover my changes
• [ x] All new and existing tests passed

[H3xaChad]

I have the same issue and can confirm the fix is working, so pulling this would be much appreciated :)

[shae-1046782]

If falling back to 320k when there's no 320k available, wouldn't that just result in a larger file size without the increase in quality?

[Silverarmor]

Dropped in favour of 4534cdc8a0804d53dd76ebc2acc58e74fc71cb0a