Hyprid MP4 - Data Corruption with Multitrack PCM24 and Frame Skip at End of Recording when Time Split

[Acey05]

Operating System Info

Windows 10

Other OS

No response

OBS Studio Version

32.0.4

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/y6SoxvJ4q2Znbxa9

OBS Studio Crash Log URL

No response

Expected Behavior

Hybrid MP4 should be recording as the Vanilla MP4 Format, but with extra robustness so it doesn't break on par with MKV.

Current Behavior

Currently Hybrid MP4 has the following issues:

• 1 Frame Drop at the end of a Timer Split Video (30 Minutes becomes 29.59.59).
• Corrupts a large part of the Video File should something happen (ei: Power Loss).
• In the few cases that it doesn't drop a Frame or doesn't Corrupt, it will still have issues if the Video File is Multi-Tracked (Channel 1 and 2 will have different levels of "solvability").

Worst Case Scenario: If something happens at the "right time", the entire file becomes corrupt and unusable, cannot be Trunct Save nor Copy Remuxed (the file is 100% lost even though it has large amounts of Data).

Steps to Reproduce

1. Select Hybrid MP4.
2. Set Recording with common settings (ei: Variable Bitrate Target Quality).
3. Set video Split Intervals (ei: 30 minutes).
4. Record.
5. If Power Loss - High Chance of 1 or 3 types of Corruption occurring.
6. If not, then 1 Frame Drop at Timer Interval as set above.
   ...

Anything else we should know?

I haven't tested out Fragmented MP4 itself (since it has performance issues in the past with external softwares and multi-tracks).

I also have no idea if PCM could be the issue (since I'm trying to record in an uncompressed Audio Format), but this issue was still happening even early on when I used AAC since the first iterations of Hybrid MP4.

[derrod]

Do you have any example files that were unrecoverable?

[Acey05]

Sorry, the only proof I could show is an old screenshot of the File in something like Adobe Premiere AFTER it was "recovered" with a Trunct attempt (the audio tracks would be broken and a lot of frame freezes), otherwise nothing would play or load the file.

The file would also be around like 10-20GB so no idea where I could upload have uploaded it (I tried Youtube for example and it got stuck trying to Upload/Process the video infinitely until it failed like 12 hours later).

I could pull my PC Power cable during a recording, but I'm not too keen on that.

PS: Forgot to mention that I even tried the Remux option in OBS itself (which I used to do the Past for a "crashed" MKV file) and OBS took like 1 hours to process the file, but it was still unreadable/couldn't be opened.

[derrod]

I've fixed the last frame on splits missing at least because I knew why that happens. Unfortunately for corruption I'd need a raw sample to see what happened, e.g. uploaded to Google Drive.

Also for reference, you could try remuxing it with mp4box, that is a lot faster than FFmpeg and OBS's built-in feature: MP4Box -inter 500 <file.mp4>