AVAssetWriter如何创建MOV视频无压缩？(AVAssetWriter How to cr

我'从图像阵列创建视频。我工作的目的是建立一个.mov影片无压缩。我已经在开发商图书馆看到它存在一个关键的“AVVideoCompressionPropertiesKey”但我不知道如何指定与此键无压缩。

请问你能帮帮我吗？

下面是我的示例代码：

NSDictionary *videoCleanApertureSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                            [NSNumber numberWithInt:320], AVVideoCleanApertureWidthKey,
                                            [NSNumber numberWithInt:480], AVVideoCleanApertureHeightKey,
                                            [NSNumber numberWithInt:10], AVVideoCleanApertureHorizontalOffsetKey,
                                            [NSNumber numberWithInt:10], AVVideoCleanApertureVerticalOffsetKey,
                                            nil];

NSDictionary *codecSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                               [NSNumber numberWithInt:960000], AVVideoAverageBitRateKey,
                               [NSNumber numberWithInt:1],AVVideoMaxKeyFrameIntervalKey,
                               videoCleanApertureSettings, AVVideoCleanApertureKey,
                               nil];


NSDictionary *videoOutputSettings = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecH264, AVVideoCodecKey,codecSettings,AVVideoCompressionPropertiesKey, [NSNumber numberWithInt:size.width], AVVideoWidthKey,
                                     [NSNumber numberWithInt:size.height], AVVideoHeightKey, nil];

self.videoWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoOutputSettings];

Answer 1:

尝试使用AVVideoCodecJPEG设置为1.0的的NSNumber的AVVideoQualityKey值。另一种方法是指定H264，设置比特率的东西非常非常高，并指定为1的关键帧间隔（即，所有关键帧）。

Answer 2:

这关键是不要禁用压缩，是为某些编解码器指定特定的压缩值，如JPG或H264 .IE

    [videoSettings addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
                                                 AVVideoCodecH264, AVVideoCodecKey,
                                                 nil]];

        NSMutableDictionary* videoCompressionSettings = [NSMutableDictionary dictionary];

        if ([[Preferences instance] recordingH264Keyframes] > 0) {
            [videoCompressionSettings addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
                                                     [NSNumber numberWithInt:[[Preferences instance] recordingH264Keyframes]], AVVideoMaxKeyFrameIntervalKey,
                                                     nil]];
        }

        if ([[Preferences instance] recordingH264Bitrate] > 0) {
            [videoCompressionSettings addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
                                                     [NSNumber numberWithInt:[[Preferences instance] recordingH264Bitrate]*1000], AVVideoAverageBitRateKey,
                                                     nil]];
        }

        if ([videoCompressionSettings count]) {
            [videoSettings addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:videoCompressionSettings,AVVideoCompressionPropertiesKey,nil]];
        }