How do I force a specific format to be downloaded e.g. webm

[pooky2483]

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

What operating system do you use ?

Kubuntu 16.04/14.04

List of actions to perform to reproduce the problem:

1. Set filename format to CUSTOM
2. Video format to WEBM
3. Audio format blank, I've even tried setting it to OPUS
4. Setting next to ADD, I change to WEBM
5. Edit save path to where I require them to be saved
6. Copy list of youtube addresses of channels
7. Click on ADD
8. Click on the 'cloud' to start the downloads

What is the expected behaviour ?

I expect the downloads to all be webm format

What happens instead ?

Some formats are mp4 or other

Issue is that formats other than WEBM are downloaded I have the same settings on a laptop running Kubuntu 16.04 and the latest versions of youtube-dl & youtube-dlg and that one downloads the requested format no trouble, the one I'm having problems with is on a virtualbox copy of Kubuntu 16.04 inside a master OS of Kubuntu 14.04

[nodiscc]

@pooky2483 can you try to reproduce the problem again, and send the logs? (as requested in the template)