MPEG-4 (Video Podcast) Export Options

This exports the presentation to an MPEG-4 video file which is compatible with many portable video players (including the video iPod™) and also with QuickTime. Please note, the MPEG-4 export does not meet accessibility requirements. To ensure that your presentation meets accessibility requirements you will need to export either the HTML or the QuickTime movie in addition to the MPEG-4 format.

MPEG-4 Export Options

Video Quality

This sets the quality of the video.

Medium quality will be adequate for most uses.

Audio Quality

This sets the quality of the audio. The audio is exported in the MPEG-4 format, so high quality audio can be achieved at very small file sizes. The highest quality (128 Kbs) will be very near to CD quality in most circumstances.

For voice recordings, medium quality (32 Kbs) will usually provide exceptional quality for the size.

Stereo/Mono

This sets whether the audio will be exported in stereo or mono.

If the audio that is recorded or imported is in mono, the audio should be exported as mono. In this case exporting it as stereo will not increase the quality of the file and will cause the file size to increase significantly.

Captions

You can choose up to three different formats for exporting captions in MPEG-4 videos.

SMIL

SMIL (Synchronized Multimedia Integration Language) is a W3C standard for presenting multimedia presentations. It saves the video and audio as one combined file and the text captions as a separate file. Finally, it creates a .smil file (pronounced "smile file") which tells media players like QuickTime how to combine the two files. When a person loads the .smil file the media player will automatically load the necessary media files and synchronize them.

One advantage of the SMIL format is that it allows assistive technologies to have easy access to the captions of a movie.

LecShare Pro will create an .htm file for use on a web server so the .smil file will play correctly in QuickTime.

You can use the SMIL format to create an online accessible movie and then allow people to download just the .mov file for their MPEG-4 video player. This way the online movie is accessible and the downloadable version does not have the captions.

Squeeze

The "Squeeze" method will reduce the vertical dimension of your slides and place the captions in the lower 36 pixels of the screen. The slides will be slightly distorted since the vertical resolution is reduced while the horizontal resolution is maintained. The captions will have a black background with a white font. This caption box will cover over the bottom 36 pixels of the slide.

This method allows you to incorporate the captions directly into the MPEG-4 file.

If the output is going to be played on a video capable iPod, it is highly recommended that the output resolution be set to 320 x 240. Higher resolutions will make the captions very small on the iPod. It is also recommended to use the "High" Video Quality.

Overlay

The "Overlay" method will place the captions in the lower 36 pixels of the slide. The captions will have a black background with a white font. This caption box will cover over the bottom 36 pixels of the slide.

This method allows you to incorporate the captions directly into the MPEG-4 file. This method also will keep your slides at their full resolution, as opposed to the "Below" method.

If the output is going to be played on a video capable iPod, it is highly recommended that the output resolution be set to 320 x 240. Higher resolutions will make the captions very small on the iPod. It is also recommended to use the "High" Video Quality.

Below

The "Below" method will proportionally shrink the slide to allow the captions to occupy the lower 36 pixels of the video frame. The slide will have black bars on either side of it to accommodate for the smaller size.

This method incorporates the captions directly into the MPEG-4 file.

If the output is going to be played on a video capable iPod, it is highly recommended that the output resolution be set to 320 x 240. Higher resolutions will make the captions very small on the iPod due to the resolutions being scaled down. It is also recommended to use the "High" Video Quality.