AVAssetExportSession 在 IOS 13 上失败,将音频和视频混合在一起
AVAssetExportSession fails on IOS 13, muxing together audio and video
此代码在所有 IOS 13 之前的设备上有效(并且仍然有效)。目前,在 exportAsynchronously 调用运行后出现此错误:
Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could
not be completed" UserInfo={NSLocalizedFailureReason=An unknown error
occurred (-12735), NSLocalizedDescription=The operation could not be
completed, NSUnderlyingError=0x282e194a0 {Error
Domain=NSOSStatusErrorDomain Code=-12735 "(null)"}}
不确定 IOS 13 adds/changes AVAssetExportSession 对象的基本设置中的一些要求还是什么?可能是 IOS 错误?
代码如下:
func compileAudioAndVideoToMovie(audioInputURL:URL, videoInputURL:URL) {
let docPath:String = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0];
let videoOutputURL:URL = URL(fileURLWithPath: docPath).appendingPathComponent("video.mp4");
do
{
try FileManager.default.removeItem(at: videoOutputURL);
}
catch {}
let mixComposition = AVMutableComposition();
let videoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid);
let videoInputAsset = AVURLAsset(url: videoInputURL);
let audioTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: kCMPersistentTrackID_Invalid);
let audioInputAsset = AVURLAsset(url: audioInputURL);
do
{
try videoTrack?.insertTimeRange(CMTimeRangeMake(start: CMTimeMake(value: 0, timescale: 1000), duration: CMTimeMake(value: 3000, timescale: 1000)), of: videoInputAsset.tracks(withMediaType: AVMediaType.video)[0], at: CMTimeMake(value: 0, timescale: 1000));// Insert an 3-second video clip into the video track
try audioTrack?.insertTimeRange(CMTimeRangeMake(start: CMTimeMake(value: 0, timescale: 1000), duration: CMTimeMake(value: 3000, timescale: 1000)), of: audioInputAsset.tracks(withMediaType: AVMediaType.audio)[0], at: CMTimeMake(value: 0, timescale: 1000));// Insert an 3-second audio clip into the audio track
let assetExporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetPassthrough);
assetExporter?.outputFileType = AVFileType.mp4;
assetExporter?.outputURL = videoOutputURL;
assetExporter?.shouldOptimizeForNetworkUse = false;
assetExporter?.exportAsynchronously {
switch (assetExporter?.status)
{
case .cancelled:
print("Exporting cancelled");
case .completed:
print("Exporting completed");
case .exporting:
print("Exporting ...");
case .failed:
print("Exporting failed");
default:
print("Exporting with other result");
}
if let error = assetExporter?.error
{
print("Error:\n\(error)");
}
}
}
catch
{
print("Exception when compiling movie");
}
}
问题似乎与 AVAssetExportPresetPassthrough(以及处理 AAC 的组合,也许)有关
更改为 AVAssetExportPresetLowQuality 或 AVAssetExportPresetHighestQuality 并且 video/audio 已正确合二为一。同样,这只是一个 IOS 13 问题,很可能是一个错误。
此代码在所有 IOS 13 之前的设备上有效(并且仍然有效)。目前,在 exportAsynchronously 调用运行后出现此错误:
Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-12735), NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x282e194a0 {Error Domain=NSOSStatusErrorDomain Code=-12735 "(null)"}}
不确定 IOS 13 adds/changes AVAssetExportSession 对象的基本设置中的一些要求还是什么?可能是 IOS 错误?
代码如下:
func compileAudioAndVideoToMovie(audioInputURL:URL, videoInputURL:URL) {
let docPath:String = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0];
let videoOutputURL:URL = URL(fileURLWithPath: docPath).appendingPathComponent("video.mp4");
do
{
try FileManager.default.removeItem(at: videoOutputURL);
}
catch {}
let mixComposition = AVMutableComposition();
let videoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid);
let videoInputAsset = AVURLAsset(url: videoInputURL);
let audioTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: kCMPersistentTrackID_Invalid);
let audioInputAsset = AVURLAsset(url: audioInputURL);
do
{
try videoTrack?.insertTimeRange(CMTimeRangeMake(start: CMTimeMake(value: 0, timescale: 1000), duration: CMTimeMake(value: 3000, timescale: 1000)), of: videoInputAsset.tracks(withMediaType: AVMediaType.video)[0], at: CMTimeMake(value: 0, timescale: 1000));// Insert an 3-second video clip into the video track
try audioTrack?.insertTimeRange(CMTimeRangeMake(start: CMTimeMake(value: 0, timescale: 1000), duration: CMTimeMake(value: 3000, timescale: 1000)), of: audioInputAsset.tracks(withMediaType: AVMediaType.audio)[0], at: CMTimeMake(value: 0, timescale: 1000));// Insert an 3-second audio clip into the audio track
let assetExporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetPassthrough);
assetExporter?.outputFileType = AVFileType.mp4;
assetExporter?.outputURL = videoOutputURL;
assetExporter?.shouldOptimizeForNetworkUse = false;
assetExporter?.exportAsynchronously {
switch (assetExporter?.status)
{
case .cancelled:
print("Exporting cancelled");
case .completed:
print("Exporting completed");
case .exporting:
print("Exporting ...");
case .failed:
print("Exporting failed");
default:
print("Exporting with other result");
}
if let error = assetExporter?.error
{
print("Error:\n\(error)");
}
}
}
catch
{
print("Exception when compiling movie");
}
}
问题似乎与 AVAssetExportPresetPassthrough(以及处理 AAC 的组合,也许)有关
更改为 AVAssetExportPresetLowQuality 或 AVAssetExportPresetHighestQuality 并且 video/audio 已正确合二为一。同样,这只是一个 IOS 13 问题,很可能是一个错误。