Video uploaded to youtube has low quality preview thumbnail - ios

I have an iphone application that uploads videos to youtube. It uploads the video files without a problem. But there is an issue that the thumbnail preview image is of very low quality.
My question is this, is it possible using the youtube api to set a different preview image?

No. this is not possible with the Standard API.
See this answer for possible ways forward. Youtube API - Set the Thumbnail of video

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I want to hide some private content on screenshots. Since Apple provide us only userDidTakeScreenshotNotification, the only way to achieve this is to convert image to video with DRM. According to these thread:
If your application uses FairPlay Streaming (FPS) your video content
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feature or QuickTime Player on macOS. The portion of your application
that is playing the content will be blacked out.
I found commercial implementation of these idea in ScreenShieldKit, but it costs money.
The main question:
How it's possible to convert image or label to FairPlay Streaming (FPS) video in offline mode?

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Difference in quality when video is uploaded directly from camera and when it is selected from gallery

Problem
I am currently developing an iPhone app, where I need to upload a video with a multipart post request.
I am using AfNetworking and UIImagePickerController.
I set the quality of the UIImagePickerController to high.
When I try to upload a video that has just been recorded in the app, the quality is significantly lower, than when I choose a previously recorded video from the gallery.
Question
Does anybody have experience like this one ?

iOS - Dropbox API : Get icon for videos

I have images and videos stored on Dropbox. I can retrieve the thumbnails of the images. That's great, but if my metadata is a video, I don't have any thumbnails.
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Compress iOS video using Phonegap

Is there any tips, suggestions, or available plugins for Phonegap that might be available to Capture a video using Phonegap's capture feature, then programmatically compress or reduce the quality of the video such that it can be uploaded to a server?
The video file sizes can become rather large with videos longer than 5 minutes. I would strongly prefer not to have save the video to the iPhone.
Currently it is not possible. You might have a look at this plugin, but up to Cordova 3.5 it is not possible to compress a video, and you can set its duration only on iOS

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