解码具有PNG编解码器类型的.mov视频文件

Question

我正在尝试使用AVFoundation的“ PNG，时间码”编解码器解码视频并出现错误

Error Domain=AVFoundationErrorDomain Code=-11833 "Cannot Decode" UserInfo={NSLocalizedFailureReason=The decoder required for this media cannot be found.,NSUnderlyingError=0x610000044050 {Error Domain=NSOSStatusErrorDomain Code=-12906 "(null)"}, AVErrorMediaTypeKey=vide, NSLocalizedDescription=Cannot Decode}

来自AVAssetReader。 可能需要为AVAssetReaderTrackOutput使用特定的像素格式类型吗？

videoTrack.format中的信息说明：

<CMVideoFormatDescription 0x618000042ac0 [0x7fff7b281390]> {
    mediaType:'vide' 
    mediaSubType:'png ' 
    mediaSpecific: {
        codecType: 'png '       dimensions: 2852 x 1871 
    } 
    extensions: {<CFBasicHash 0x61800006c180 [0x7fff7b281390]>{type = immutable dict, count = 9,
entries =>
    0 : <CFString 0x7fff7eee0750 [0x7fff7b281390]>{contents = "TemporalQuality"} = <CFNumber 0x27 [0x7fff7b281390]>{value = +0, type = kCFNumberSInt32Type}
    1 : <CFString 0x7fff7eee0790 [0x7fff7b281390]>{contents = "Version"} = <CFNumber 0x117 [0x7fff7b281390]>{value = +1, type = kCFNumberSInt16Type}
    2 : <CFString 0x7fff7eee0590 [0x7fff7b281390]>{contents = "FormatName"} = PNG
    3 : <CFString 0x7fff7ad964d8 [0x7fff7b281390]>{contents = "CVPixelAspectRatio"} = <CFBasicHash 0x61800006c140 [0x7fff7b281390]>{type = immutable dict, count = 2,
entries =>
    1 : <CFString 0x7fff7ad964f8 [0x7fff7b281390]>{contents = "HorizontalSpacing"} = <CFNumber 0xb2427 [0x7fff7b281390]>{value = +2852, type = kCFNumberSInt32Type}
    2 : <CFString 0x7fff7ad96518 [0x7fff7b281390]>{contents = "VerticalSpacing"} = <CFNumber 0xb2427 [0x7fff7b281390]>{value = +2852, type = kCFNumberSInt32Type}
}

    4 : <CFString 0x7fff7eee0550 [0x7fff7b281390]>{contents = "VerbatimSampleDescription"} = <CFData 0x618000140370 [0x7fff7b281390]>{length = 106, capacity = 106, bytes = 0x0000006a706e67200000000000000001 ... 00000b2400000000}
    5 : <CFString 0x7fff7eee07b0 [0x7fff7b281390]>{contents = "RevisionLevel"} = <CFNumber 0x117 [0x7fff7b281390]>{value = +1, type = kCFNumberSInt16Type}
    6 : <CFString 0x7fff7eee0770 [0x7fff7b281390]>{contents = "SpatialQuality"} = <CFNumber 0x40027 [0x7fff7b281390]>{value = +1024, type = kCFNumberSInt32Type}
    7 : <CFString 0x7fff7eee07d0 [0x7fff7b281390]>{contents = "Vendor"} = appl
    8 : <CFString 0x7fff7eee05b0 [0x7fff7b281390]>{contents = "Depth"} = <CFNumber 0x2017 [0x7fff7b281390]>{value = +32, type = kCFNumberSInt16Type}
}
}
}

我可以使用AVFoundation解码该视频吗？

另外，如果使用QuickTime Player打开该视频并重新保存，则使用“ Apple ProRes 4444，Timecode”编解码器保存了该视频，并且可以使用AVFoundation对该视频进行解码，但是文件大小会从800Kb增加到2Mb。

谢谢你的帮助！

Answer 1

您只能使用这些API打开H264编码的视频。