[Mp4-tech] RE: regarding H.264 [RTP]

[Luca]

>  I am student and need to get RTP info from JM 13.2 reference encoder.
>  This info might be somethig like this:
>
>  Seq. no, Frame #, Slice #, Slice type, Slice size, Slice time stamp
>
>  The idea is to put one slice in one NALU/RTP packet. I am using
>  configuration file encoder1.cfg, in which the following 6 lines are
>  changed as following (as compared to the encoder.cfg provided in the
>  JM package):
>
>  FramesToBeEncoded     = 10      # Number of frames to be coded
>  OutFileMode            =  1  # Output file mode, 0:Annex B, 1:RTP
>  SliceMode               =  2   # Slice mode (0=off 1=fixed #mb in
>  slice 2=fixed #bytes in slice 3=use callback)
>  SliceArgument         = 1000   # Slice argument (Arguments to modes 1
>  and 2 above)
>  RateControlEnable   = 1     # 0 Disable, 1 Enable
>  Bitrate                    = 64000 # Bitrate(bps)
>
>  I am not sure of many aspects of this config, e.g. if one slice is
>  really being placed in each NALU and RTP packet. Also using the
>  rtpdump tool, I generate an info file which has info about RTP
>  packets, does not contain a priority field of NALU (2 bits in NALU
>  header, called NRI), which I am looking forward to.
>
>  Could somebody help me in this stuff. I am a newbie to work in this domain.
>
>  thanks many.
>  regards
>  basim

Dear Basim,
If you want a 264 file in RTP format, with 1000 Bytes per slice fixing
the bitrate to 64000 bps, your configuration file seems to be ok.
NAL Header + [Slice Header + Slice] = NALU. RTP Header + NALU = RTP Packet
In RTP format, the 264 file (for each RTP packet) looks like
| length of the packet (fixed 4 Bytes) | Intime word (fixed 4 Bytes) |
RTP Header (fixed 12 Bytes) | NAL Header (fixed 1 Byte) | NAL Payload
(variable < 1000 Bytes in your case) |
Hope this helps. If not, just ask.
Luca.