Hello,
To create a test project, I want to understand how the video and audio settings would look for a destination video whose content comes from a source video.
I obtained the output from the source video in the audio and video tracks as follows:
let audioSettings = [
AVFormatIDKey: kAudioFormatLinearPCM,
AVSampleRateKey: 44100,
AVNumberOfChannelsKey: 2
] as [String : Any]
var audioOutput = AVAssetReaderTrackOutput(track: audioTrack!,
outputSettings: audioSettings)
// Video
let videoSettings = [
kCVPixelBufferPixelFormatTypeKey: kCVPixelFormatType_32BGRA,
kCVPixelBufferWidthKey: videoTrack!.naturalSize.width,
kCVPixelBufferHeightKey: videoTrack!.naturalSize.height
] as [String: Any]
var videoOutput = AVAssetReaderTrackOutput(track: videoTrack!, outputSettings: videoSettings)
With this, I'm obtaining the
CMSampleBuffer
using
AVAssetReader.copyNextSampleBuffer
.
How can I add it to the destination video?
Should I use a while loop, considering I already have the
AVAssetWriter
set up?
Something like this:
while let buffer = videoOutput.copyNextSampleBuffer() {
if let imgBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) {
let frame = imgBuffer as CVPixelBuffer
let time = CMSampleBufferGetPresentationTimeStamp(sampleBuffer)
adaptor.append(frame, withMediaTime: time)
}
}
Lastly, regarding the destination video.
How should the
AVAssetWriterInput
for audio and PixelBuffer of the destination video be set up?
Provide an example, something like:
let audioSettings = […] as [String: Any]
Looking forward to your response.
