ios - 无法将 caf 格式转换为 m4a 格式
<p><p>我使用以下代码将 caf 格式转换为 m4a 格式并保存到 Iphone 的另一个目录,它在 Xcode 4.6.3 的 IOS6 中工作,但是当我更新到 Xcode 5 时,它不再工作了。如果在 Xcode 5 中使用 IOS6 模拟器,它会再次工作。</p>
<pre><code>-(void)saveFile {
NSString *docDirPath = ;
outputFile = ]];
}
</code></pre>
<p>所以我想知道这是 IOS 7 的错误还是 Apple 改变了什么?</p>
<p>谢谢</p>
<p><strong>更新</strong></p>
<pre><code>AVURLAsset *audioAsset = [initWithURL:recordedTmpFile options:nil];
AVMutableComposition *mixComposition = ;
AVMutableCompositionTrack *compositionTrackA = ;
AVAssetTrack *clipAudioTrack = [ lastObject];
;
AVAssetExportSession *exporter =[ initWithAsset:mixComposition presetName:AVAssetExportPresetAppleM4A];
;
NSParameterAssert(exporter!=nil);
exporter.outputFileType=AVFileTypeAppleM4A;
exporter.outputURL=outputFile;
// Subtract a fraction of a second so the first word isn't chopped off
clipStartTime = clipStartTime - kSilenceBeforeFirstAudio;
CMTime start=CMTimeMake(clipStartTime * 100, 100);
CMTime duration=CMTimeMake(clipDuration * 100, 100);
CMTimeRange range=CMTimeRangeMake(start, duration);
exporter.timeRange=range;
;
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>好的,我发现了问题。
应该替换这一行</p>
<pre><code>;
</code></pre>
<p>到</p>
<pre><code> [exporter exportAsynchronouslyWithCompletionHandler:^{
int exportStatus = exporter.status;
switch (exportStatus) {
case AVAssetExportSessionStatusFailed: {
NSError *exportError = exporter.error;
NSLog (@"AVAssetExportSessionStatusFailed: %@", exportError);
break;
}
case AVAssetExportSessionStatusCompleted: {
NSLog (@"AVAssetExportSessionStatusCompleted--");
break;
}
case AVAssetExportSessionStatusUnknown: {
NSLog (@"AVAssetExportSessionStatusUnknown");
break;
}
case AVAssetExportSessionStatusExporting: {
NSLog (@"AVAssetExportSessionStatusExporting");
break;
}
case AVAssetExportSessionStatusCancelled: {
NSLog (@"AVAssetExportSessionStatusCancelled");
break;
}
case AVAssetExportSessionStatusWaiting: {
NSLog (@"AVAssetExportSessionStatusWaiting");
break;
}
default: { NSLog (@"didn't get export status"); break;}
}
}];
</code></pre></p>
<p style="font-size: 20px;">关于ios - 无法将 caf 格式转换为 m4a 格式,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/19116339/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/19116339/
</a>
</p>
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