转自：http://blog.csdn.net/caoshangpa/article/details/53008018

 

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PT	Encoding Name	Audio/Video (A/V)	Clock Rate (Hz)	Channels	Reference
0	PCMU	A	8000	1	[]
1	Reserved
2	Reserved
3	GSM	A	8000	1	[]
4	G723	A	8000	1	[][]
5	DVI4	A	8000	1	[]
6	DVI4	A	16000	1	[]
7	LPC	A	8000	1	[]
8	PCMA	A	8000	1	[]
9	G722	A	8000	1	[]
10	L16	A	44100	2	[]
11	L16	A	44100	1	[]
12	QCELP	A	8000	1	[]
13	CN	A	8000	1	[]
14	MPA	A	90000		[][]
15	G728	A	8000	1	[]
16	DVI4	A	11025	1	[]
17	DVI4	A	22050	1	[]
18	G729	A	8000	1	[]
19	Reserved	A
20	Unassigned	A
21	Unassigned	A
22	Unassigned	A
23	Unassigned	A
24	Unassigned	V
25	CelB	V	90000		[]
26	JPEG	V	90000		[]
27	Unassigned	V
28	nv	V	90000		[]
29	Unassigned	V
30	Unassigned	V
31	H261	V	90000		[]
32	MPV	V	90000		[]
33	MP2T	AV	90000		[]
34	H263	V	90000		[]
35-71	Unassigned	?
72-76	Reserved for RTCP conflict avoidance				[]
77-95	Unassigned	?
96-127	dynamic	?			[]

 

除了上表中明确指定PT值的负载类型，还有些负载类型由于诞生的较晚，没有具体的PT值，只能使用动态（dynamic）PT值，即96到127，这就是为什么大家普遍指定H264的PT值为96。下表中列出了没有具体PT值的负载类型。

 

Media Type	Subtype	Clock Rate (Hz)	Channels (audio)	Reference
application	1d-interleaved-parityfec			[]
application	h224	4800		[]
application	parityfec			[]
application	raptorfec			[]
application	rtx			[]
application	smpte336m			[]
application	ulpfec			[]
audio	1d-interleaved-parityfec			[]
audio	32kadpcm	8000		[][]
audio	ac3			[]
audio	AMR	8000		[][]
audio	AMR-WB	16000		[][]
audio	amr-wb+	72000		[]
audio	atrac3	44100		[]
audio	ATRAC-ADVANCED-LOSSLESS			[]
audio	atrac-x			[]
audio	BV16	8000		[]
audio	BV32	16000		[]
audio	clearmode	8000	1	[]
audio	CN			[]
audio	DAT12			[]
audio	dsr-es201108			[]
audio	dsr-es202050	8000		[]
audio	dsr-es202211	8000		[]
audio	dsr-es202212	8000		[]
audio	DV			[]
audio	eac3			[]
audio	EVRC	8000	1	[]
audio	EVRC0	8000	1	[]
audio	EVRC1	8000	1	[]
audio	EVRCB	8000	1	[]
audio	EVRCB0	8000	1	[]
audio	EVRCB1	8000	1	[]
audio	EVRCWB			[]
audio	EVRCWB0			[]
audio	EVRCWB1			[]
audio	fwdred			[]
audio	g719	48000		[]
audio	G7221	16000	1	[]
audio	G726-16	8000	1	[][]
audio	G726-24	8000	1	[][]
audio	G726-32	8000	1	[][]
audio	G726-40	8000	1	[][]
audio	G729D	8000	1	[][]
audio	G729E	8000	1	[][]
audio	GSM-EFR	8000	1	[][]
audio	L8			[][]
audio	raptorfec			[]
audio	RED			[][]
audio	rtx			[]
audio	VDVI		1	[][]
audio	L20			[]
audio	L24			[]
audio	MP4A-LATM			[]
audio	mpa-robust	90000		[]
audio	parityfec			[]
audio	SMV	8000	1	[]
audio	SMV0	8000	1	[]
audio	t140c			[]
audio	t38			[]
audio	telephone-event			[]
audio	tone			[]
audio	DVI4			[]
audio	G722			[]
audio	G723			[]
audio	G728			[]
audio	G729			[]
audio	GSM			[]
audio	L16			[]
audio	LPC			[]
audio	PCMA			[]
audio	PCMU			[]
audio	G7291	16000		[][]
audio	GSM-HR-08	8000		[]
audio	iLBC	8000		[]
audio	ip-mr_v2.5	16000		[]
audio	MPA	90000		[]
audio	mpeg4-generic			[][][]
audio	PCMA-WB	16000		[]
audio	PCMU-WB	16000		[]
audio	QCELP			[]
audio	rtp-midi			[]
audio	speex			[]
audio	uemclip			[]
audio	ulpfec			[]
audio	VMR-WB	16000		[][]
audio	vorbis			[]
audio	vorbis-config			[]
text	1d-interleaved-parityfec			[]
text	fwdred			[]
text	parityfec			[]
text	raptorfec			[]
text	red	1000		[]
text	rtx			[]
text	t140	1000		[]
text	ulpfec			[]
video	BMPEG	90000		[][]
video	1d-interleaved-parityfec			[]
video	3gpp-tt			[]
video	BT656	90000		[][]
video	celB			[]
video	DV	90000		[]
video	H261			[]
video	H263	90000		[]
video	H263-1998	90000		[]
video	H263-2000	90000		[]
video	H264			[]
video	H264-RCDO	90000		[]
video	H264-SVC			[]
video	JPEG			[]
video	JPEG2000			[]
video	MP1S	90000		[][]
video	MP2P	90000		[][]
video	MP2T			[]
video	MP4V-ES	90000		[]
video	mpeg4-generic			[]
video	MPV			[]
video	nv			[]
video	parityfec			[]
video	pointer	90000		[]
video	raptorfec			[]
video	raw	90000		[]
video	rtx			[]
video	SMPTE292M			[]
video	ulpfec			[]
video	vc1	90000		[]

参考链接：