视频支持格式

var formatMuxers = map[string]bool{
"3g2":             true,
"3gp":             true,
"a64":             true,
"ac3":             true,
"adts":            true,
"adx":             true,
"aiff":            true,
"alaw":            true,
"amr":             true,
"asf":             true,
"asf_stream":      true,
"ass":             true,
"ast":             true,
"au":              true,
"avi":             true,
"avm2":            true,
"bit":             true,
"caf":             true,
"cavsvideo":       true,
"crc":             true,
"data":            true,
"daud":            true,
"dirac":           true,
"dnxhd":           true,
"dts":             true,
"dv":              true,
"dvd":             true,
"eac3":            true,
"f32be":           true,
"f32le":           true,
"f4v":             true,
"f64be":           true,
"f64le":           true,
"ffm":             true,
"ffmetadata":      true,
"filmstrip":       true,
"flac":            true,
"flv":             true,
"framecrc":        true,
"framemd5":        true,
"g722":            true,
"g723_1":          true,
"gif":             true,
"gxf":             true,
"h261":            true,
"h263":            true,
"h264":            true,
"hls":             true,
"ico":             true,
"ilbc":            true,
"image2":          true,
"image2pipe":      true,
"ipod":            true,
"ircam":           true,
"ismv":            true,
"ivf":             true,
"jacosub":         true,
"latm":            true,
"m4v":             true,
"matroska":        true,
"md5":             true,
"microdvd":        true,
"mjpeg":           true,
"mkvtimestamp_v2": true,
"mlp":             true,
"mmf":             true,
"mov":             true,
"mp2":             true,
"mp3":             true,
"mp4":             true,
"mpeg":            true,
"mpeg1video":      true,
"mpeg2video":      true,
"mpegts":          true,
"mpjpeg":          true,
"mulaw":           true,
"mxf":             true,
"mxf_d10":         true,
"null":            true,
"nut":             true,
"ogg":             true,
"oma":             true,
"psp":             true,
"rawvideo":        true,
"rm":              true,
"roq":             true,
"rso":             true,
"rtp":             true,
"rtsp":            true,
"s16be":           true,
"s16le":           true,
"s24be":           true,
"s24le":           true,
"s32be":           true,
"s32le":           true,
"s8":              true,
"sap":             true,
"segment":         true,
"smjpeg":          true,
"smoothstreaming": true,
"sox":             true,
"spdif":           true,
"srt":             true,
"stream_segment":  true,
"ssegment":        true,
"svcd":            true,
"swf":             true,
"tee":             true,
"truehd":          true,
"u16be":           true,
"u16le":           true,
"u24be":           true,
"u24le":           true,
"u32be":           true,
"u32le":           true,
"u8":              true,
"vc1":             true,
"vc1test":         true,
"vcd":             true,
"vob":             true,
"voc":             true,
"w64":             true,
"wav":             true,
"webm":            true,
"webvtt":          true,
"wtv":             true,
"wv":              true,
"yuv4mpegpipe":    true,
}