Retrieving movie codec under iOS?

Question

I am trying to find the codec used to compress a movie. I am sure if I need to somehow use CMFormatDescription and get a CMVideoCodecType key. I am stuck as to how to get pa

Answer 1

I think it's definitely harder than it should be

    #define FourCC2Str(code) (char[5]){(code >> 24) & 0xFF, (code >> 16) & 0xFF, (code >> 8) & 0xFF, code & 0xFF, 0}

    if ([assetTrack.mediaType isEqualToString:AVMediaTypeVideo])
    {
        for (id formatDescription in assetTrack.formatDescriptions)
        {
            NSLog(@"formatDescription:  %@", formatDescription);

            CMFormatDescriptionRef desc = (__bridge CMFormatDescriptionRef)formatDescription;
            //CMMediaType mediaType = CMFormatDescriptionGetMediaType(desc);

            // CMVideoCodecType is typedefed to CMVideoCodecType

            CMVideoCodecType codec = CMFormatDescriptionGetMediaSubType(desc);

            NSString* codecString = [NSString stringWithCString:(const char *)FourCC2Str(codec) encoding:NSUTF8StringEncoding];
            NSLog(@"%@", codecString);

        }
    }