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Chapter 5, Using Matrox VS4 with Telestream Wirecast
Record functionality
This section describes the VS4 functionality regarding the recording session,
record timecode, and input recording.
Recording session
A recording session begins when you click , and ends when you click .
During a recording session, all selected inputs are recorded. See “Input
recording” on page 74 for the input recording methods.
¡ Important If the status light turns red when recording, this indicates that one
or more of the selected inputs experienced dropped or skipped frames. After the
recording session ends, check the Record.Log file to see the dropped/skipped
events for each recorded input (see “Record log file” on page 77).
Record timecode
Starting a recording session also starts the record timecode for each selected
input. Depending on the video input frame rate, Matrox VS4 displays the
timecode in either drop frame (HH:MM:SS;FF) or non-drop frame
(HH:MM:SS:FF) SMPTE format. Drop frame format is used for NTSC, 23.98
fps, 29.97 fps, and 59.94 fps video, and non-drop frame format is used for all
other video frame rates, such as PAL and 25 fps. If you select an input at any time
during a recording session, the record timecode for that input starts when you
select the input. A recording’s timecode stops only when the recording ends for
that input file. See “Input recording” on page 74 for information on stopping an
input recording.
Input recording
This section describes the various ways of recording an input source, and
stopping an input recording:
¦NoteIf an input with no input signal (disconnected) or an invalid input signal
is selected during a recording session, the recorded video will be black with no
audio. Check the Record.Log file to see where black frames are recorded (see
“Record log file” on page 77).
Recording methods:
• Selecting an input before starting a recording session If an input is
selected before starting a recording session, Matrox VS4 creates a recording
for that input when the recording session starts. This includes an “invalid
input,” which refers to an input with no input signal (disconnected) or an
invalid input signal. In this case, the video for an “invalid input” will be
black and the video format of the recorded file will be the last valid video
format detected for that input. When connecting a valid source to an “invalid
input” during a recording session, make sure your source’s video format
matches the format of the “invalid input” to avoid creating a new file. See
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