使用 AVAssetExportSession 导出音频和视频，但 iphone4 4.2.1 中音频未播放

发布于 2025-01-05 23:11:03 字数 1381 浏览 3 评论 0原文

我正在导出audio.caf 音频文件和video.mp4 视频并创建一个新的output.mp4 合成。它在 iOS 5.0 上运行良好，但在 iPhone4 4.2.1 上，该组合无法播放音频。

NSURL *outputURL = [NSURL fileURLWithPath:outputPath];
AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];
_assetExport.outputFileType = AVFileTypeQuickTimeMovie;
_assetExport.outputURL = outputURL;
_assetExport.timeRange = CMTimeRangeMake(CMTimeMakeWithSeconds(0.25, 600), videoAsset.duration);
_assetExport.shouldOptimizeForNetworkUse = YES;

[_assetExport exportAsynchronouslyWithCompletionHandler:^{

我检查了这款 iPhone 中的原始曲目，都没有问题，只是合成没有添加音频。

这就是我将音轨添加到合成中的方法：

NSURL *audioURL = [NSURL fileURLWithPath:audioPath];
AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audioURL options:nil];
CMTimeRange audio_timeRange = CMTimeRangeMake(CMTimeMake(startRecording_,1), 
                                              audioAsset.duration);

AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];

[b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:kCMTimeZero error:&error];

它在许多 iOS5 设备中都有效：S

提前致谢！

原文

I'm exporting audio.caf audio file with video.mp4 video and creating a new output.mp4 composition.
It works fine with iOS 5.0, but with an iPhone4 4.2.1, the composition doesn't play the audio.

NSURL *outputURL = [NSURL fileURLWithPath:outputPath];
AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];
_assetExport.outputFileType = AVFileTypeQuickTimeMovie;
_assetExport.outputURL = outputURL;
_assetExport.timeRange = CMTimeRangeMake(CMTimeMakeWithSeconds(0.25, 600), videoAsset.duration);
_assetExport.shouldOptimizeForNetworkUse = YES;

[_assetExport exportAsynchronouslyWithCompletionHandler:^{

I've checked the original tracks in this iphone and both are ok, only the composition doesn't add the audio.

This is how I'm adding the audio track to the composition:

NSURL *audioURL = [NSURL fileURLWithPath:audioPath];
AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audioURL options:nil];
CMTimeRange audio_timeRange = CMTimeRangeMake(CMTimeMake(startRecording_,1), 
                                              audioAsset.duration);

AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];

[b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:kCMTimeZero error:&error];

It worked in many iOS5 devices :S

Thanks in advance!

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