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Camtasia for RealPlayer Streaming Media File
| Product: | Camtasia Studio | | Platform: | Win 98 and above |
| Version: | 2.0 and 3.0 |
Note: Once you have reviewed the information in this section and have selected the options for this file format, you will need to continue with Video Size.
The Camtasia RealPlayer Plugin Encoding Options screen allows you to select the options that will be used to configure the video during production.
This file format uses the Camtasia for RealPlayer Plug-In to stream video with perfect lossless quality. The audio stream is encoded with standard Real Audio codecs. Choose this option for content with few color gradients, low motion, and where the highest video quality is required.
The Camtasia for RealPlayer file format produces a presentation in three files:
- mymovie.camv (the video stream)
- mymovie.rm (the audio stream, if any)
- mymovie.smil (SMIL presentation file to play the audio and video streams simultaneously).
RealPlayer 8.0 or later must be installed on your system to play this format. If you are asked if you would like to update your RealPlayer, do so. When you select Camtasia for RealPlayer in Camtasia, the required Plug-In from the RealNetworks AutoUpdate service should be downloaded automatically, if necessary.
Note: A video only presentation does not require an SMIL file. The .CAMV file can be opened directly in RealPlayer.
Note: To stream a .CAMV file from a RealServer, stop RealServer, copy the camtasf.dll file format Plug-In from the Camtasia install folder to your RealServer Plugging folder and then restart RealServer.
Tips for Reducing Dropped Frames when Producing a Camtasia for RealPlayer (.camv) File
If you are experiencing dropped frames during the production of a .camv file, the following are several tips for helping to reduce dropped frames:
- Increase the target bitrate.
- Decrease the audio bitrate.
- Increase the buffering 'preroll'.
- Decrease the frame rate.
- Decrease the color depth.
- Avoid content with a lot of color gradients and motion.
Camtasia for RealPlay Options Description Table
The following table describes each of the Camtasia for RealPlayer production options.
| Camtasia for RealPlayer Option |
Description |
| Target Audience |
Used to select the appropriate throughput option based on the access methods your viewers are likely to use.
For best performance, select the largest bandwidth likely. For conservative performance, select the smallest likely bandwidth.
To choose a Target Audience option, click on the box next to the desired option. A checkmark will display when enabled.
Note: Multiple target audience selections are not supported. Choose only one Target Audience option.
|
| Target Bitrate Settings |
Used to set the overall bitrate for each target audience. This gives you control over the exact bitrate (audio and video combined) that the streaming media file will be encoded for.
For example, it is common to encode to a target bitrate of 34 Kbps for the 56K modem target audience, since 34 Kbps of actual useable bandwidth is what you can typically expect.
To set the bitrate, click on the Target Bitrate Settings button. The Target Bitrate Settings dialog box is displayed. Continue with Target Bitrate Settings Dialog Box.
|
| Audio Target Settings |
Used to set the bitrate allocated to the audio stream (if any) in your streaming media file. The video stream uses leftover bandwidth, if any. That is, if you choose 56K modem as a target audience and configure the audio stream bitrate to be 16 Kbps for the 56K modem target audience, then the video stream is encoded to a 18 Kbps bitrate (assuming the overall bitrate for 56K modem is set to 34 Kbps).
Note: The bandwidth for the video stream (resulting in fewer dropped video frames) can be increased by choosing a lower audio bitrate.
To set the bitrate, click on the Audio Target Settings button.
The Target Audience Settings dialog box is displayed. Continue with Target Audience Settings; AudioTab.
|
| Preroll |
Used to set the amount of time, in seconds, that RealPlayer initially buffers the audio and video stream before it starts to play the movie.
Note: You can artificially increase the bandwidth for the video and audio stream (resulting in fewer dropped video frames) by increasing the preroll. There is a limit to how much preroll your audience will tolerate. With too large a preroll, you loose the advantages of streaming, since so much of the file must be downloaded and buffered before the movie starts to play.
To set the Preroll, enter the amount of seconds in the Preroll field.
|
| Keyframe every |
Used to determine how often to include a keyframe in the video stream.
A keyframe is a video frame that does not depend on previous frames streamed to RealPlayer. It is used to recover from lost frames, during network congestion for example, and, during seeking in the movie when the user moves the seek slider in RealPlayer.
Increasing the keyframe frequency results in quicker and smoother seeking. However, it increases the bandwidth needed for the video stream.
To set the Keyframe inclusion rate, enter the amount of seconds in the Keyframe every field.
|
| Colors |
This field is used to select the color depth of the video stream. 16-bit color is essentially lossless video.
The 12- and 9-bit color settings reduce the color in the video, resulting in some loss of quality such as exhibiting bands of color gradients.
The 12- and 9-bit color settings can significantly reduce the bandwidth required for the video stream.
To select the colors, choose the desired option from the dropdown menu.
|
| Frame Rate |
The target frame rate for the video stream. Choose automatic to use the highest frame rate of all the clips on the Storyboard. If the frame rate can not be achieved at a given target bitrate, video frames are dropped. Lower the frame rate to reduce the bandwidth needed by the video stream, but then your video can become choppy. |
| Audio Format |
Select a format from the dropdown list that matches the type of audio that exists in the clip(s) on the Storyboard.
A No Audio setting is included to produce a movie with no audio track.
|
| Details |
The Details box shows details about the selections you have made on this tab for the audio and video options of the Camtasia for RealPlayer videos you are recording.
|
| Cancel |
Choose Cancel to exit back to the previous screen without making any changes. |
| Help |
Choose Help to access the online help file containing information that is pertinent to this screen. |
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