iOS App Preview Video upload timeout is much too short

Originator:phil
Number:rdar://19969331 Date Originated:26-Feb-2015
Status:Duplicate of 19969261 (Open) Resolved:
Product:iTunes Connect Product Version:
Classification:Performance Reproducible:Always
 
Summary:
Uploading videos as App Previews for iOS apps will time out after a very short time. Video files are notoriously large, so this is a major problem for developers who do not have access to an exceptionally fast internet connection.

Based on our experiences, the upload timeout appears to be approximately 3 minutes, which would require a minimum upload speed of about 2.5Mbit/s for a 40MB file.

Steps to Reproduce:
1. Get an iOS app submission ready, using Safari on OS X Yosemite.
2. Prepare an App Preview video in iMovie, say with a file size of around 40MB.
3. Connect to the web using an internet connection that has an upload speed of probably over 90% of the world's internet connections, e.g. an ADSL connection with 800kbit/s uplink as is very common in Europe. Alternatively, use Link Conditioner to simulate such a connection.
4. Attempt to upload the video as the app preview.

Expected Results:
The upload should successfully complete in around 9-10 minutes.

Actual Results:
After 9-10 minutes, the video preview in the UI gets a red frame, and shows the error "Your file could not be loaded. Try again." if you hover over it with the mouse.

This appears to be caused by a timeout, as the problem does not appear with a faster connection.

Version:
Safari/8.0.2/OS X 10.10.2

Notes:
The timeout should be increased to something much more reasonable. The upload for an App can frequently take an hour or more, and succeeds without timeout, so it is clear this is not a technical limitation.

Additionally, the error message generated if the timeout occurs is not helpful and does not indicate that the reason for upload failure is a timeout. I have reported this issue separately as rdar://19969261

Configuration:
 * OSX Yosemite 10.10.2
 * Safari 8.0.3
 * 38.5MB App Preview video created in iMovie

Fails: ADSL internet connection with 10Mbit/s download, 0.8Mbit/s upload speeds

Succeeds: Mac using an iPhone 5's 10Mbit/s down, 3.5 Mbit/s up 3G connection via Personal Hotspot.

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