360 Systems MAXX-2420-EX, Operation Manual

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Page 78 MAXX-2420-EX Owner’s Manual
Figure 29 – Result of a VFC file transfer
Bit Rates of Transferred Files Reported in the Clip Navigator
JPEG2000 as implemented in the MAXX-HD is a variable bit rate compression technology.
What this means is that the actual bit rate (amount of video data) that is created is dependent on
the level of detail in the images in the video frame being encoded.
The Video Compression Max Bit Rate setting is only a limit. The actual bit rate is determined
by the encoder on a frame by frame basis.
When a clip is first recorded, the GUI displays the Max Bit Rate value that was in effect when
the clip was recorded.
Files that are transferred as .vfc files maintain this value.
Files that are transferred as .mxf do not carry this value, so the GUI will display the actual
calculated average bit rate of the file as a function of its size relative to its duration. Therefore it
is normal to see variation between the original and a transferred copy of the file. It does not
mean that the content of the encoded video has been changed in any way.
Supported File Types
MAXX recognizes media file types by their file extension. It is important that the file extension
properly identifies the file content. Attempts to send a file in one format but masquerading as
another due to a wrong file extension may result in undefined behavior.
It is also true that file extensions such as .mxf and .mov can contain many different formats of
video and audio. The MAXX will only accept files that contain compatible formats as defined
below.
Always test file import before depending on it for broadcast. Some formats allow wide
variation in the structure of files, and the parameters used in the video compression. MAXX-
HD will not accept all possible variations; always test files from new sources before going on
air.
00:00:00;00 00:30:00;00
00:10:00;00
(
IN POINT
)
00:20:00;00
(
OUT POINT
)
CLIP_A
Before Transfer (On Source MAXX)
00:10:00;00 00:20:00;00
CLIP_A.vfc