HEVC Recording is within reach

[bchah]

Hello friends,

I notice that even though HEVC is not officially supported for recording, it almost works!

Here is a sample file recorded through OME. While it does not play back normally in QuickTime, I can get audio playback and eventually, some video in VLC (although the first couple of keyframe intervals show as black). Do you think it would be possible to improve this?

Shoe.Sale.-.2025.01.29.10.08.55.AM.mp4

[Keukhan]

I have one question to help me reproduce the issue: Was it a recording of the bypass, or was it transcoded to HEVC before recording?

First, I will analyze the cause of the issue where the recorded file doesn't play in QuickTime.

As you already know, when you start live recording, the audio starts right away, but the video doesn’t start until the first keyframe is created. That makes it hard to sync the audio and video perfectly from the start. so, there might be a black video at the beginning.

Of course, there are ways to drop the audio or force a keyframe to sync, but since there’s no time right now, I’ll add it to the update plan.

[bchah]

Thank you @Keukhan, yes this was recorded as passthrough using the Apple HEVC encoder. The key frame issue I did not describe correctly - it took about 4 or 5 GOP lengths before VLC could draw a frame. Interestingly if I rewind after that moment, I can go see earlier frames that did not show on the first playback. If you need any more examples or other encoders (I have a few HEVC hardware encoders from Magewell, Kiloview, Blackmagic) just let me know 😀

[Keukhan]

Got it! I’ll add it to the backlog and try to patch it as soon as possible. For our sponsor~ 😊

[Keukhan]

@bchah

I was busy, so I just fixed the issue now. I tested it, and it works fine. I committed it to the master branch, so please test it and let me know the results.

Thanks 👍

2255dec...c84524b

[bchah]

Thank you @Keukhan! Another great step towards full support of HEVC 😺