Wrong aspect ratio for videos on Confluence Pages

Issue Summary

Using the new editor, videos recorded with specific software (reproducible with Microsoft Teams) will display the wrong aspect ratio while playing the video while viewing the page.

Steps to Reproduce

1. Create a page with the new editor
2. Attach a video file recorded with Microsoft Teams
3. Publish the page
4. After some minutes (at least 10 minutes) refresh the page

Expected Results

The video should have the right aspect ratio

Actual Results

After some minutes, the video will display the wrong aspect ratio:

Notes

Information about the file:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'censored_title.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2
    creation_time   : 2020-04-21T16:02:07.000000Z
  Duration: 00:51:00.67, start: 0.000000, bitrate: 328 kb/s
    Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720, 247 kb/s, 15 fps, 15 tbr, 10k tbn, 20k tbc (default)
    Metadata:
      creation_time   : 2020-04-21T16:02:07.000000Z
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 78 kb/s (default)
    Metadata:
      creation_time   : 2020-04-21T16:02:07.000000Z

Workaround

Open the file through ••• -> Attachments. It will play the video on a browser's tab with the correct aspect ratio.

OR

Re-encode the video file using HandBrake or any other video transcoder software.