[Libav-user] RTP packets with payload different to 96

[Thomas Volkert]

Hallo,

Am 25.03.2015 um 16:39 schrieb Georgi Rosenov Stefanov:
> Hello All
>
> I am tring to stream over local network and to watch the stream using VLC
>
> I am seding only video, without audio.
> I am using format name "rtp" and as file name I send IP:PORT
> It works VLC is showing the stream, but I am forced by ffmpeg to use 
> SDP file.
>
> If I do not use SDP file, VLC player says
> "
>
> SDP required:
>
> A description in SDP format is required to receive the RTP stream. 
> Note that rtp:// URIs cannot work with dynamic RTP payload format (96)."
>
>
> It is no problem to use SDP, but I want to know how to send packets 
> with payload different to 96 (dynamic payload)
>
>
> I have tried to study the code and I think that the payload could be 
> changed according to the codec I use. The possible payload types could 
> be one of
>
>
> "  {25, "CelB",       AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1},
>   {26, "JPEG",       AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MJPEG, 90000, -1},
>   {28, "nv",         AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_NONE, 90000, -1},
>   {31, "H261",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_H261, 90000, -1},
>   {32, "MPV",        AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG1VIDEO, 
> 90000, -1},
>   {32, "MPV",        AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO, 
> 90000, -1},
>   {33, "MP2T",       AVMEDIA_TYPE_DATA, AV_CODEC_ID_MPEG2TS, 90000, -1},
>   {34, "H263",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_H263, 90000, -1},"
>
>
> Am I right?
>
Yes.

>
> My file is H.264 and I do not transcode anything.
>
> Is there any way to send packets with payload different to 96 without 
> transcoding ?
>
No, for H.264 you have to use a payload ID from the dynamic range.

Best regards,
Thomas.
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