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optional int32 chunkNumber = 1
string videoId = 2
int32 itag = 3
int64 lastModified = 4
int64 contentStartOffset = 6
optional int32 isInitChunk = 8
optional int32 totalChunkNumber = 9
optional int32 ten = 10
optional int32 chunkOffsetMs = 11
int32 partLengthMs = 12
int64 contentSize = 14