DeveloppementTranscoding
From MuMuDVB Wiki - a DVB network streaming free software
| Menu |
|---|
| English | Français |
|---|---|
| Main_Page | PagePrincipale |
| NewsEn | Nouvelles |
| DocsEn | Documentation |
| DocLastVersion Most Recent Documentation | |
| Download | Téléchargement |
| Features | Fonctionalités |
| ContactEn | Contact |
| DeveloppementSupportCam | DeveloppementSupportCam |
| DeveloppementTranscoding | |
| DeveloppementIPv6 | |
| MumudvbAndS2 | |
| MuMuDVB_Embedded |
Contents |
Introduction
This page is made to follow the developpement of transcoding for mumudvb
Mumudvb is able to transcode from mpeg2-ts to mpeg4 and various other formats
http://en.wikipedia.org/wiki/H.264 http://fr.wikipedia.org/wiki/H.264
Purpose
The goal is to make mumudvb able to transcode streams, for bandwith limited networks for example
Actual status
Utelisys Communications B.V. released the code they wrote to implement transcoding to MuMuDVB. Many thanks to them.
The code have been merged in the latest MuMuDVB version.
The doc and the examples for transcoding can be found in doc/transcode
To use transcoding you have to specify --enable-transcoding to the ./configure
Since the transcoding is based on librairies from the ffmpeg project, you have to install at least libavcodec libavformat libswscale to compile MuMuDVB with transcoding, and you have to install the codecs you will use.
Thanks again to Utelisys and enjoy !
Regards
Libraries
Here's the librairies which are used
FFMpeg
http://ffmpeg.mplayerhq.hu/projects.html
http://ffmpeg.mplayerhq.hu/documentation.html
http://en.wikipedia.org/wiki/Libavcodec
FFmpeg API
Libavcodec is the library containing the codecs (both encoding and decoding). Look at `libavcodec/apiexample.c' to see how to use it.
Demux
The demuxing and remuxing is done by libavformat
Streaming (old information)
We have also to take care about streaming after transcoding. We can put mpeg4 into a ts stream, so we don't change the streaming method, except pehraps the video type in sap announces
Free (french provider) seems to put mpeg4 into ts stream and this is done for DVB-T HD
http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2005-June/001619.html
Hi Guys,
I don't understand why you want to use SL to encapsulate MPEG-4 video in MPEG-2 TS. I would have understood if you wanted to encapsulate an MPEG-4 A/V scene in TS but in the case of ES, you can perform it in a similar way as for MPEG-2 or H.264 video. Use:
- stream_id 110x xxxx for MPEG-4 audio (same range as for MPEG-1/MPEG-2 audio and MPEG-2 AAC)
- stream_id 1100 xxxx for MPEG-4 part 2 video (same range as for MPEG-1/MPEG-2 video and MPEG-4 part 10 video)
and:
- stream type 0x11 for MPEG-4 audio
- stream type 0x10 for MPEG-4 part 2 video
