Operating system: Windows 8.1
Broken: 2.80, 2019-04-09
Short description of error
Blender will try to pack all video/audio files in the vse into the .blend file if "File>External Data>Automatically Pack Into .blend" is enabled. This is terrible default behavior since it can very easily lead to blender attempting to save huge multi-gb files.
In addition to this, if you have more gb of files than you have ram, blender will crash when you enable auto-pack... really easy to do since a single video can easily be over 32gb.
Blender seems to only decide to do this for video files that have an audio track, even if the audio track is no longer loaded into the timeline.
There are no options to pack/unpack a video track. If the audio track is removed, the file will still attempt to be packed, but it cannot be unpacked.
Exact steps for others to reproduce the error
Create a new 'Video Editing' file.
Load several gb of videos with audio into the vse timeline.
Select "File>External Data>Automatically Pack Into .blend"
Save the file...