User`s manual

Alcorn McBride Digital Video Machine HD User’s Manual Rev 1.0
58
Audio Formats
When encoding video files as Transport Streams, it is possible to play audio along
with video. Here are the supported audio formats:
Format Variations
MPEG MPEG-1 Layer I/II, MPEG-2 Layer II
AAC MPEG-2 AAC, MPEG-4 AAC LC 2-Channel
AC3*
Dolby® Digital EX, Pro Logic® II, MLP and DTS®
*AC3 audio streams are not decoded in the DVMHD. They are only streamed from
the digital audio outputs of the DVMHD, and must be decoded using an external AC3
decoder or receiver.
File System Limitation – 4GB File Size
If the File Splitter
software is no longer
available, please
obtain the latest
manual from the
Alcorn McBride
website, or contact
technical support for
the latest
recommended method
for splitting files.
The Digital Video Machine HD uses the FAT32 file system to store files on the
Compact Flash card. This file system is widely used, and will allow your flash cards to
be accessible from any Windows based PC or MAC computer.
Although the supported volume size of Compact Flash cards is much larger, the
maximum file size supported by FAT32 is 4GB. Your computer will prevent you from
copying a file any larger than this to the Compact Flash card.
If your application requires a longer playback time than a 4GB limitation will allow, the
best solution is ‘split’ your file into several segments using a file-splitting program.
One suggestion is a software package called File Splitter, which can be downloaded
at
http://www.filesplitter.org/. Using this method, a large file can be separated into
several segments which the DVMHD can treat as a single coherent video file. Here’s
how it works.
Let’s say that you have encoded a 10GB Transport Stream file that you want to play
in the DVMHD. First, you will need to use a utility (like File Splitter) to divide this file
into several chunks smaller than 4GB. To be safe, you could divide the file into 2GB
chunks. When the splitting process is complete, you should have 5 files. Rename
those files like this:
VID00001.MPG
VID00001.001
VID00001.002
VID00001.003
VID00001.004
Keep in mind that VID00001.MPG is the first segment, VID00001.001 is the second
segment, and so on. When you are finished renaming the files, copy them to the
DVMHD’s Compact Flash card.
At this point, all you have to do is treat VID00001.MPG as you normally would. For
example, if you send a command to Play File #1, the DVMHD will automatically play
through all of the file chunks without you having to do anything special. You can also
send a command to Loop File #1, and the entire file will loop from start to finish just as
you would expect.