https://github.com/bhuga/blackmagic-intensity-issue-demo
Quickie demo of an issue with blackmagic intensity on OS X
https://github.com/bhuga/blackmagic-intensity-issue-demo
Last synced: about 1 month ago
JSON representation
Quickie demo of an issue with blackmagic intensity on OS X
- Host: GitHub
- URL: https://github.com/bhuga/blackmagic-intensity-issue-demo
- Owner: bhuga
- Created: 2012-10-10T22:35:07.000Z (over 12 years ago)
- Default Branch: master
- Last Pushed: 2012-10-10T22:44:00.000Z (over 12 years ago)
- Last Synced: 2025-03-24T15:47:31.922Z (2 months ago)
- Language: Objective-C
- Size: 551 KB
- Stars: 7
- Watchers: 3
- Forks: 1
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
Blackmagic Intensity AVFoundation Issue Demo
============================================
This is a quickie demonstration of an audio sync issue with a Blackmagic
Intensity Extreme and AVFoundation. It's the base case as far as I can tell.
The audio lags quite a bit behind the video, and the video has an artifact at
the beginning of the recording session.
Although it's not demonstrated here, I see identical results with a custom setup
that uses sample buffers via data output delegates.
## Using it
Run the ./bm_problem_demo:
```
./bm_problem_demo 'Blackmagic' 'Blackmagic Audio' '720p - Uncompressed 8-bit 4:2:2' '59.94 FPS'
```
The arguments are the video device, audio device, video format, and video frame
rate. FPS is written as `59.94 FPS` or `60 FPS`. The others are the names that
the AVFoundation driver reports.
The sample output will be in `~/Movies/output.mov`.