I observe significant performance differences when encoding a video in mp4 format (H264). The code I use is standard (using AVAssetWriter, AVAssetWriterInput...).
Here is what I notice when I run the same code on different platforms:
- On an iPhone, the video is encoded in 3 seconds (iPhone 13, 14, 15, 16, Pro...).
- On a Mac equipped with an M2 Pro, the video is encoded in 50 seconds.
- On a Mac equipped with an Intel processor (2,3 GHz Intel Xeon W 18 cœurs), the video is encoded in 2 minutes.
The encoding on an iPhone is very fast due to hardware acceleration. However, I don’t understand why I don’t get similar performance with a Mac M2 Pro, which is equipped with a dedicated component for hardware acceleration (H264 media engine)?
Is hardware acceleration disabled on a Mac?