我提取了MPEG-DASH xml，并手动下载了媒体网址，并且我有一个mp4视频文件，而音频文件已分别保存到mp4a文件中。
我想将此音频和视频文件合并为单个mp4文件。
我尝试使用MediaMuxer，但是MediaExtractor不知道mp4a文件。
我提取了文件编解码器等元数据信息，以及下面的其他详细信息。
音频文件元数据信息
MDItemAudioBitRate = 48
kMDItemAudioChannelCount = 1
kMDItemCodecs = (
AAC
)
kMDItemContentCreationDate = 2018-08-03 09:41:01 +0000
kMDItemContentCreationDate_Ranking = 2018-08-03 00:00:00 +0000
kMDItemContentModificationDate = 2018-08-03 09:41:01 +0000
kMDItemContentType = "public.mpeg-4"
kMDItemContentTypeTree = (
"public.mpeg-4",
"public.item",
"public.movie",
"public.audiovisual-content",
"public.mpeg-4",
"public.data",
"public.content"
)
kMDItemDateAdded = 2018-08-03 09:41:01 +0000
kMDItemDateAdded_Ranking = 2018-08-03 00:00:00 +0000
kMDItemDisplayName = "1533200401950_a.mp4"
kMDItemDurationSeconds = 1129.732
kMDItemFSContentChangeDate = 2018-08-03 09:41:01 +0000
kMDItemFSCreationDate = 2018-08-03 09:41:01 +0000
kMDItemFSCreatorCode = ""
kMDItemFSFinderFlags = 0
kMDItemFSHasCustomIcon = (null)
kMDItemFSInvisible = 0
kMDItemFSIsExtensionHidden = 0
kMDItemFSIsStationery = (null)
kMDItemFSLabel = 0
kMDItemFSName = "1533200401950_a.mp4"
kMDItemFSNodeCount = (null)
kMDItemFSOwnerGroupID = 20
kMDItemFSOwnerUserID = 501
kMDItemFSSize = 7068402
kMDItemFSTypeCode = ""
kMDItemInterestingDate_Ranking = 2018-08-03 00:00:00 +0000
kMDItemKind = "MPEG-4 movie"
kMDItemLastUsedDate = 2018-08-03 11:18:56 +0000
kMDItemLastUsedDate_Ranking = 2018-08-03 00:00:00 +0000
kMDItemLogicalSize = 7068402
kMDItemMediaTypes = (
Sound
)
kMDItemPhysicalSize = 7069696
kMDItemStreamable = 0
kMDItemTotalBitRate = 48
kMDItemUseCount = 7
kMDItemUsedDates = (
"2018-08-02 19:30:00 +0000"
)
视频元数据信息：
kMDItemCodecs = (
"H.264"
)
kMDItemContentCreationDate = 2018-08-03 11:06:58 +0000
kMDItemContentCreationDate_Ranking = 2018-08-03 00:00:00 +0000
kMDItemContentModificationDate = 2018-08-03 11:07:02 +0000
kMDItemContentType = "public.mpeg-4"
kMDItemContentTypeTree = (
"public.mpeg-4",
"public.item",
"public.movie",
"public.audiovisual-content",
"public.mpeg-4",
"public.data",
"public.content"
)
kMDItemDateAdded = 2018-08-03 11:06:58 +0000
kMDItemDateAdded_Ranking = 2018-08-03 00:00:00 +0000
kMDItemDisplayName = "1533200401950_v.mp4"
kMDItemDurationSeconds = 1129.441
kMDItemFSContentChangeDate = 2018-08-03 11:07:02 +0000
kMDItemFSCreationDate = 2018-08-03 11:06:58 +0000
kMDItemFSCreatorCode = ""
kMDItemFSFinderFlags = 0
kMDItemFSHasCustomIcon = (null)
kMDItemFSInvisible = 0
kMDItemFSIsExtensionHidden = 0
kMDItemFSIsStationery = (null)
kMDItemFSLabel = 0
kMDItemFSName = "1533200401950_v.mp4"
kMDItemFSNodeCount = (null)
kMDItemFSOwnerGroupID = 20
kMDItemFSOwnerUserID = 501
kMDItemFSSize = 107974918
kMDItemFSTypeCode = ""
kMDItemInterestingDate_Ranking = 2018-08-03 00:00:00 +0000
kMDItemKind = "MPEG-4 movie"
kMDItemLastUsedDate = 2018-08-03 11:07:06 +0000
kMDItemLastUsedDate_Ranking = 2018-08-03 00:00:00 +0000
kMDItemLogicalSize = 107974918
kMDItemMediaTypes = (
Video
)
kMDItemPhysicalSize = 117506048
kMDItemPixelHeight = 704
kMDItemPixelWidth = 396
kMDItemStreamable = 0
kMDItemTotalBitRate = 762
kMDItemUseCount = 1
kMDItemUsedDates = (
"2018-08-02 19:30:00 +0000"
)
kMDItemVideoBitRate = 762
请咨询