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Including RealVideo® files in your site
Corporate Plan and higher virtual domain accounts include the use of the popular RealVideo® server.
STEP 1: CAPTURE THE VIDEO FILE
In order to to encode the RealVideo files, the video must first be in a format that the RealVideo encoder can use. The video that you have must be captured in the one of the following formats.
- AVI
- QuickTime
VHS, Beta or Laser Disc can be the source for the actual video content to capture. Consult your video capture card documentation on how to capture video in to AVI or QuickTime formats.
- NOTE:
RealVideo supports any frame size with a height and width that are multiples of 16. The RealVideo encoder will also accept a 160x120 image size. When creating content, it is recommend to use a frame size of 176x144. Most video capture cards do not support this size. Indeo drivers must be installed on your machine for the encoder to be able to open the AVI. If the AVI file was captured with the same machine there is usually no problem. You can locate the INDEO drivers at this location; http://developer.intel.com/pc-supp/multimed/indeo/codec.htm
STEP 2: CREATE THE REALVIDEO FILE
You must have the RealVideo encoder to encode Video
for the RealVideo server. You can download a copy of the encoder from http://www.real.com/
You must set three Parameters when encoding the
RealVideo file: Audio codec,
video bit rate, and frame rate. The quality of the video file depends
on these three settings.
-
First choose the bit rate for the video. See table below.
| Targeted Modem Rate | Total Bit Rate |
| 28.8 kbps | 19 |
| 56.0 kbps | 44 |
| 64.0 kbps | 56 |
| 128.0 kbps | 105 |
- Choose the Audio codec. In order to figure out
which codec to use. Follow this formula.
Video Bit Rate = (Total Bit Rate) - (Bandwidth of Audio Codec)
The RealVideo has discreet bandwidths. The video bit rate will be the difference between the total bit rate and the bit rate used by the chosen audio codec:
**Video Bit rate is calculated by the real video encoder automatically.
- Now choose the Frame Rate for the video. This depends on the content type of the video. If you have talking head type video The highest frame rate that can be achieved at 19 kbps, will be 7.5 to 10 frames per second (fps) for talking head type content with decent quality. A sporting event may only support 1 fps or maybe less. See the table below for a guidelines.
| Content type | Target Bandwidth | Total Bit Rate | Audio Codec | Audio Bit Rate | Frame Rate |
| Talking Heads 28.8 |
28.8 | 19 | 6.5 Kbps voice | 6.5 | optimize |
| Talking Heads 56 |
56.0 | 44 | 6.5 Kbps voice | 8.5 | optimize |
| Music Video 28.8, Emphasize Audio |
28.8 | 20 | RealMedia 12 kbps | 12 | .25 |
| Music Video 56, Emphasize Audio |
56.0 | 44 | RealAudio 3.0 - 28.8 Mono, full response |
16 | optimize |
| Music Video 28.8, Emphasize Video |
28.8 | 20 | RealMedia 8 kbps |
8 | optimize |
| Music Video 56, Emphasize Video |
56 | 44 | RealMedia 12 kbps | 12 | optimize |
| High Action w/ Voice, 28.8 | 28.8 | 19 | 6.5 Kbps voice | 6.5 | 1 |
| High Action w/ Voice, 56 | 56 | 44 | RealAudio 2.0 - 28.8 | 15.2 | optimize |
| High Action w/Music, 28.8 | 28.8 | 19 | RealMedia 8 kbps |
8 | 1 |
| High Action w/ Music, 56 | 56 | 44 | RealAudio 3.0 - 28.8 Mono, full response | 16 | optimize |
| High Action, 56,Fractal | 56 | 44 | RealAudio 3.0 - 28.8 Mono, full response | 8.5 | 10 |
| High Action, 112, Fractal |
112.0 | 44 | RealAudio 3.0 - 28.8 Mono, full response |
8.5 | 10 |
- After selecting the correct Audio codec, video bit rate, and frame rate you can now encode the file. If you have the Real Video Player you can test the video file on your local system. You can download a copy of the Real Video Player from http://www.real.com/
Now save the Real Video File.
** Important **
Do NOT use underscore ("_") characters when naming RM files as
they will not be interpreted correctly by the .ram file.
STEP 3: CREATING THE .RAM FILE
You need to create a text file with a ".ram" extension. This text file contains a URL to the RealAudio file in the following format:
pnm://<yourdomain>/~<userid>/audiofilename.rm
Note the "pnm:" prefix. Substitute your domain name and userid above. There must be a tilde (~) before the userid. This file can reside in the root directory of your account. The audio file name must have a ".rm" extension.
Once the .ram text file is created, save it and upload it to your web site in ASCII transfer mode. We suggest using the same file naming convention. (e.g. "test.ram" will launch the "test.rm" file)
STEP 4: UPLOAD THE .RM FILE TO YOUR WEB SITE
Upload the .rm file to the root directory of your web site in binary transfer mode.
STEP 5: CREATING THE HTML CODE FOR THE REALAUDIO FILE
The HTML document does NOT reference the .ra file itself; it must call the .ram file which, in turn, launches the RealAudio file as represented below.
<a href="http://(yourdomain.com)/(textfile.ram)">Listen to Audio</a>
If you reference the .ra file directly from your HTML code, the audio file may play, but you will not benefit from the streaming audio effect.
EXTRA: TIPS AND TRICKS
More information for putting RealVideo files on your page is available at http://service.real.com/.
