No mix option for DASH formats in version 0.4

[Lirk88]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like that [x])
• Use Preview tab to see how your issue will actually look like

WARNING

All invalid issues will be rejected!!

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Before going further

• If your problem is a bug with youtube-dl or a request for new site support please report it here

• Make sure you are using the latest youtube-dl-gui version (Click the Settings icon and then About to view the current version)

• Make sure you are using the latest youtube-dl version (Click the Settings icon and then Update to update to the latest youtube-dl version)

• Make sure you searched the bugtracker for similar issues including closed ones

• Make sure to read the FAQs file

  • [ ] I think my problem is NOT with youtube-dl
  • [ ] I've verified and i assure that I'm running youtube-dl-gui 0.4
  • [ ] I assure that i am using the latest version of youtube-dl
  • [ ] Searched bugtracker
  • [ ] I've read the FAQs file

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What is the purpose of your issue?

• [ ] Bug report
• [ ] Feature request (request for a new functionality)
• [ ] Question
• [ ] Other

Please remove any sections between (---) if they are not related to your issue

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Bug report

If the problem occurs when downloading a URL please provide the full verbose output as follows:

1. Restart youtube-dl-gui
2. Go to Options > Extra tab
3. Enable Debug youtube-dl
4. Go to Options > Advanced tab and Clear your log content
5. Try to download the URL
6. Copy the whole log content and insert it between the ``` part below

delete me and insert your log content here

What operating system do you use ?

List of actions to perform to reproduce the problem:

1. ..
2. ..
3. ..

What is the expected behaviour ?

What happens instead ?

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Feature request (request for a new functionality)

Please make sure that the requested feature is NOT already in the TODO list

• [ ] I've verified and i assure that my requested feature is NOT in the TODO list

What operating system do you use ?

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[MrS0m30n3]

Already in the TODO list.