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Description of problem:
On aarch64 I'm not able to save a video from browser

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1. open browser
2. I used http://video.blendertestbuilds.de/download.blender.org/peach/trailer_1080p.ogg
3. the video starts playing
4. from context me pick Save As..
5. Save the file somewhere

Actual results:
Nothing crash but I can see following message on cmdline. File is not saved.
*************************
A coding exception was thrown and uncaught in a Task.

Full message: TypeError: Argument 5 of splice is undefined
Full stack: ffi@resource://gre/modules/osfile/osfile_shared_allthreads.jsm:1109:1
pump_splice@resource://gre/modules/osfile/osfile_unix_front.jsm:603:1
copy@resource://gre/modules/osfile/osfile_unix_front.jsm:659:23
move@resource://gre/modules/osfile/osfile_unix_front.jsm:708:8
move@resource://gre/modules/osfile/osfile_async_worker.js:207:1
worker.dispatch@resource://gre/modules/osfile/osfile_async_worker.js:31:26
anonymous/AbstractWorker.prototype.handleMessage@resource://gre/modules/workers/PromiseWorker.js:122:16
@resource://gre/modules/osfile/osfile_async_worker.js:46:43

*************************


Expected results:
no error video should be saved

Additional info:

I am unable to reproduce this with firefox-52.2.0-1.el7_3.aarch64 on an updated RHELSA 7.3 system.  The example URI is no longer valid, but I uploaded a webm video to a private location and tried the same.  Also note that there is no longer a "Save As..." but separate "Save Video As..." and "Save Snapshot As..."; I tried the former, and the video was saved successfully.

Are you still able to reproduce this on an updated RHELSA 7.3 system?

Right can't reproduce either with firefox-52.2.0-1.el7_3.aarch64.

And yes they changed the link.