Multimedia macro doesn't work properly with mp4 and mov videos

Summary

When using the Multimedia macro to view videos, it might work or not. The video start but stops at a certain time saying that they are either corrupted or run into a decoding problem. It's unclear what causes the problem reported here since it's not consistent.

Steps to replicate

1. Install Confluence 6.12.x with either Oracle/Adopt java
2. Create a test space/page
3. Remain on the page Editor mode and Drag'n drop a mp4 or mov file (it will automatically become a multimedia macro), best if it's around 30mb or more.
4. Execute the video with the browser dev console + network open to monitor the error.
5. Firefox and Chrome were used and had different results depending on the file, not its type.
6. We're going to see the below errors:

   In Chrome

   :8092/confluence/download/attachments/7110694/4K%20VIDEO%20ultrahd%20hdr%20sony%204K%20VIDEOS%20demo%20test%20nature%20relaxation%20movie%20for%204k%20oled%20tv.mp4:1 GET http://localhost:8092/confluence/download/attachments/7110694/4K%20VIDEO%20ultrahd%20hdr%20sony%204K%20VIDEOS%20demo%20test%20nature%20relaxation%20movie%20for%204k%20oled%20tv.mp4 net::ERR_CONTENT_LENGTH_MISMATCH 304
   

   In Firefox

   Media resource http://localhost:8092/confluence/download/attachments/4980755/LED%20Sign%20Basics%20TEST-14min.mov could not be decoded.
   DACI+register
   Media resource http://localhost:8092/confluence/download/attachments/4980755/LED%20Sign%20Basics%20TEST-14min.mov could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_DECODE_ERR (0x806e0004)
   Details: mozilla::MediaResult mozilla::AppleATDecoder::DecodeSample(mozilla::MediaRawData *): Error decoding audio sample: 1852797029 @ 234196462
   

Expected results

Video will run without problems.

Actual results

Video suddenly stops and needs to be started again from where it stopped.

Bug variation

The problem reported here is very similar to an older bug and looks like it's derived from:

• Multimedia macro does not render mp4 videos

Workaround

May use the user macro from:

• https://community.atlassian.com/t5/Confluence-questions/What-are-you-using-for-streaming-video-to-confluence/qaq-p/614294