How to calculate bit rate of video?

Question

In iPhone developing video compress functionality. I developed that features but little bit confusion about bit rate calculation.

I m using bellow methods for video compress.

 1. AVAsset 
 2. AVAssetTrack
 3. AVAssetWriterInput
 4. AVAssetWriter
 5. AVAssetReader
 6. AVAssetReaderOutput
 7. AVAssetTrack
 8. AVAssetReader

Can we get video bit rate of original video?

http://stackoverflow.com/questions/18199018/programatically-get-the-bitrate-of-an-audio-file http://stackoverflow.com/questions/2159663/how-to-get-specific-information-about-media-files-duration-bitrate-fps-etc — Tirth, Jan 21 '14 at 05:36
http://stackoverflow.com/questions/4929825/how-can-i-read-the-properties-of-an-audio-file-in-objective-c-for-ios — Tirth, Jan 21 '14 at 05:38

score 2 · Answer 1 · answered Apr 28 '15 at 11:18

Loop through the tracks of AVAsset, determine what kind of track it is (audio/video) and use "estimatedDataRate" property of AVAssetTrack to get the average bitrate of file. Something like this:

AVAsset *asset = [AVAsset assetWithURL:url];
for(AVAssetTrack *track in asset.tracks)
{
    if([track.mediaType isEqual:AVMediaTypeVideo])
    {
        videoBitrate = track.estimatedDataRate;
    }
    if([track.mediaType isEqual:AVMediaTypeAudio])
    {
        audioBitrate = track.estimatedDataRate;
    }
}

How to calculate bit rate of video?

1 Answers1