home *** CD-ROM | disk | FTP | other *** search
- Introdution
- ***********
- This is an Amiga version of Christph Moars MPEG-
- multiplexer "MPLEX". This tool enables you to mix a
- MPEG video and audiostream into one single MPEG-System stream.
- In other words:
- Now you can create MPEG videos with sound!
-
-
-
- Example
- *******
- To demonstrate the usage of mplex we need a video and a matching
- audiostream. Here we simply split an existing system stream
- into its single parts and the join them together again using
- mplex. We will use splitmpeg (Aminet) to split the promotion
- video for Maxon Cinema 4D from the CD of German AmigaPlus 8/98.
-
- 9.Leer1:MpgTest> splitmpeg cd0:cinema4d.mpg
-
- SYSTEM HEADER
- -------------
- Maximum Multiplexed data rate =176400 bytes per second
- Max number of audio streams = 1
- Bitrate is variable
- Multiplexed stream meets constrained parameters
- There is a constant rational relationship between the
- audio sampling rate and the system clock frequency in the system
- target decoder
- There is a constant rational relationship between the
- video picture rate and the system clock frequency in the system
- target decoder
- Max number of video streams = 0
- Reserved_byte = ff
- Stream Information
- for stream 1c0 : Buffer bound = 32768 bytes
-
-
- Processing Complete
- Processed 17087 Packs , 2 system headers and 17089 Packets
- 9.Leer1:MpgTest>
-
- When this command has finished we got three new files:
- Leer1:MpgTest/stm190.mpg (Paddingstream)
- Leer1:MpgTest/stm192.mpg (Audiostream)
- Leer1:MpgTest/stm224.mpg (Videostream)
- Only the audio and video file is of intrest for us.
-
-
-
- Multiplexing of the both streams
- ********************************
- Now we can use mplex to (re)mix these two streams to a new
- single systemstream.
-
- mplex-1.1 stm224.mpg stm192.mpg system.mpg
-
- Attention!
- Do not forget to specify the outputfile! There will be no
- warning from mplex. Mplex will assume that you want to create
- a systemfile without audio or video, so it will use the second
- parameter as the output filename. This file will then be overwritten!
-
- First mplex scans the video and audiostream and displays a lot of
- information about your streams.
- Then you have to input some parameters.
-
- The following values have been used for testing:
-
- sector size (CD-ROM 2324 bytes) : 2324
- packs to packets ratio : 1
- STD video buffer in kB (CSPS: max 46 kB) : 40
- STD audio buffer in kB (CSPS: max 4 kB) : 4
- target data rate (e.g. 175050) : 175050
- startup sectors_delay : 8
- startup sectors_delay : 0
- video stream startup offset (ms) : 0
-
- The answer to the question "very verbose mode?" should be "n",
- otherwise a huge amount of messages will be displayed.
-
-
-
- Speed, differnt versions
- ************************
- The program has been compiled using SAS/C for 68000 and ppc as well
- as using gcc (Geek-Gadgets, ADE) for 68000.
- The SAS/C version has stack checking enabled, so it should work with
- every configuration without any problems.
- The gcc version runs a little bit faster but needs the ixemul.library.
-
- For the example above I got the following results (68060/50/604e/200)
- sas68k 6 Min 8 Sek
- gcc68k 4 Min 55 Sek
- sasppc 2 Min 46 Sek
-
-
-
- notice, changes to the original
- *********************************
- I have only compiled the program for the Amiga, I can not help you
- with the correct parameters! Please read the documentations in the
- original archive!
- With gcc no changes to the original files were necessary.
- There are some smaller changes for the SAS compiler. The changes are
- in the file main.c and they are well commented.
-
- And now start your own project!
- Alexander Fritsch
-
-
-
-
-
-
-
- PS.
- If you are a programmer and still locking for a good idea what to
- do:
- In the Aminet there seems to be no program for creating MPEG videos
- (or audio files) directly from VLabMotion/Movieshop. So you could make
- an AREXX script or something like that...
-
-