Workshops

This text is from my arcives. It may be out of date, but I thought it should be preserved.

The following Workshops are available:



How to create a System-Stream (MPEG with video & audio)

It's very simple: Just follow these three steps.

First Create an Video-Stream
Just use the mpeg2enc+ or a similar program to create an MPEG1.
If You want to create an Video-CD compatible MPEG, just use one of the special prefs (mpeg2enc+).
Second Create an Audio-Stream
Use an MPEG-Audio encoder like MusicIn, Pegase, Lame, NcodeR, ... (there are many in the AmiNet).
If You want to create an Video-CD compatible MPEG, You have to create an MPEG1 / Layer II (aka .mp2), with two channels (stereo), 44100 Hz sampling frequency and a bit rate of 224Kbps.
For other streams are the settings are also useful. But use 128-224kbps and Layer II or III. Note: the multiplexer in the AmiNet can not handle Layer III streams.
Third Create an System-Stream
You have to use a program like mplex (AmiNet: gfx/conv) or similar to join the two streams.
The three parameters of mpex are the video-, audio- and system-stream-name.
Now the program request a few parameters:

sector size 2324 for Video-CD (which I use)
packs to packets ratio 1..50, low values are useful
I use 1..4
STD video buffer in kB 1..46, no idea, whats the best
40 for Video-CD (which I use)
STD audio buffer in kB 1..4, no idea, whats the best
4 for Video-CD (which I use)
target data rate You should use the computed value, if there are too may timeouts use a higher value, otherwise You can try a lower value to reduce the stream size.
176400 for Video-CD
startup sectors_delay 0..?, I use 8, with success
video stream startup offset 0..?, see below
audio stream startup offset 0..?, This is an option to set an offset for (i.e. lip-)synchronizing problems. This is a common issue with streaming media. (Thanks to Vidar Andersen)



How to create a Video-CD

Ok, just create a System-Stream like explained above (using all Video-CD restrictions). Than write it on a CD. I don't know any Amiga program, which can handle that. But e.g. "WinOnCD" (PC) can do that...


How to create a QuickTime Movie from MovieShop

It's much simpler than creating a MPEG.

First Create a movie with MovieShop.
Second Use the Scene-Handler to mount the project:
Select the Scene/Project and press "Mount"
Third Use JPEG2MOV to create the Movie:
Now there are a small problem: with a project size of e.g. 752×544 will the pictures have a size of 752×272. Assuming that a low quality Movie should created (~1/4th of the project size) we're starting JPEG2MOV with the following ENTeters:

TO The name of the movie to create
FROM Assuming, that the scene to convert is called FINAL: "SCE:FINAL/PIC/P.00000".
CROPHEIGHT=CH, SCALEHEIGHT=SH If the movie should have the same height than the pictures (272) You must not enter anything.
If The movie should be taller You can crop or scale the pic to the correct size (or both). (Read the JPEG2MOV doc for more help)
CROPWIDTH=CW, SCALEWIDTH=SW Now, the pictures have the double size than the movie, we must scale to get an correct aspect. If Your movie should have the width 320, You can use (for example) CW=640 and SW=320. This will second scale it to the correct aspect, and first crop it to the double of the movie size. (Read the JPEG2MOV doc for more help)
SND Assuming, that the scene to convert is called FINAL: "SCE:FINAL/SND.AIFF".
This will only works with 8/16 bit (no a/µLaw)
ORIGFPS This is always 50 (PAL) or 60 (NTSC).
FPS The Fps-rate of the movie. Useful values are ORIGFPS / (1 or 2 or 4).
Fourth Recompress the movie with a useful format (Read the JPEG2MOV doc for more help)



How to create a MPEG from MovieShop

Ok, first mount the Scene/Project (like above). Then start the mpeg2enc+ and enter all neccesary parameters. Don't forget, that the Picture FPS-Rate is always 50 (PAL) / 60 (NTSC). Now You can make everyting like in the mpeg workshop.

0 Responses to “Workshops”


Comments are currently closed.