Ios AVAssetWriter编解码器类型hevc
我试图使用AVAssetWriter将H264视频转码到HEVC,但在iPhone 6s上失败了。据推测,iPhone6S支持HEVC进行转码,而不是实时视频编码。同样的代码也适用于iPhone7及以上版本。如果iPhone 6s不支持HEVC编解码器,我们如何在运行时以编程方式确定支持的编解码器Ios AVAssetWriter编解码器类型hevc,ios,avfoundation,avassetwriter,hevc,avassetwriterinput,Ios,Avfoundation,Avassetwriter,Hevc,Avassetwriterinput,我试图使用AVAssetWriter将H264视频转码到HEVC,但在iPhone 6s上失败了。据推测,iPhone6S支持HEVC进行转码,而不是实时视频编码。同样的代码也适用于iPhone7及以上版本。如果iPhone 6s不支持HEVC编解码器,我们如何在运行时以编程方式确定支持的编解码器 let bitrate = trackBitrate / 5 let trackDimensions = trackSize let compressionSettings: [String: An
let bitrate = trackBitrate / 5
let trackDimensions = trackSize
let compressionSettings: [String: Any] = [
AVVideoAverageBitRateKey: bitrate,
AVVideoMaxKeyFrameIntervalKey: 30,
AVVideoProfileLevelKey: kVTProfileLevel_HEVC_Main_AutoLevel
]
var videoSettings: [String : Any] = [
AVVideoWidthKey: trackDimensions.width,
AVVideoHeightKey: trackDimensions.height,
AVVideoCompressionPropertiesKey: compressionSettings
]
videoSettings[AVVideoCodecKey] = AVVideoCodecType.hevc
我最后就是这样做的
if #available(iOS 11.0, *), AVCaptureVideoDataOutput().availableVideoCodecTypes.contains(.hevc) {
// use .hevc settings here
} else {
// use .h264 settings here
}
如果您的应用程序针对的是
#available
检查,以使编译器满意。您可以通过以下代码获得iPhone型号:
+ (NSString *) deviceModel {
struct utsname systemInfo;
uname(&systemInfo);
return [NSString stringWithCString: systemInfo.machine encoding: NSUTF8StringEncoding];
}
并确定iPhone 6S是否禁用H265编码,以及上面的iPhone 7是否启用H265编码