Interruption Of Signal During Recording; Alignment Of Audio And Video; Audio Track Arming - Sound Devices PIX 260i User Manual

ProRes is a variable data rate codec; DNxHD is a fixed data rate codec. PIX 260i supports all com-
pression levels and bit rates of DNxHD and ProRes and automatically records the correct bit rate
dependent upon the video input resolutions and frame rate. The data rates indicated in the Setup
Menu item [Video - Codec] indicate the maximum data rate at 1080p30.
DNxHD 36 Mb/s only supports 1080p signal. Standard definition recording is only available for ProRes
422 HQ, ProRes 422, and ProRes 422 Proxy.

Interruption of Signal During Recording

In video mode, in the event that video signal is lost (an unplugged HDMI or SDI cable, for example)
during recording, the PIX 260i will pause the recording and wait for video signal to be re-initialized.
If video signal is re-initialized recording will begin again to a new file of the same name with an
"A" appended to the end. Further interruptions of signal during that take will cause an alphabetic
filename progression ("B", "C", etc).
In Audio Mode, loss of video signal will have no affect on the transport state unless the video signal is the
sync reference source.

Alignment of Audio and Video

An advantage to recording audio on the PIX 260i along with the video is the elimination of audio/
video sync problems in post. The PIX 260i has many options regarding audio sources along with the
two options for video inputs, HDMI and SDI. Given this flexibility, care must still be taken to ensure
good audio/video sync.
If recording camera audio embedded on HDMI or SDI, then the audio/video alignment will be ex-
cellent provided the alignment is proper on the camera.
If recording audio using the dedicated audio inputs (Analog, AES, or Dante), then a delay may need
to be dialed in. The reason for this is that some cameras have a delay of one or more frames from lens
to SDI/HDMI output. The PIX 260i on the other hand has no appreciable delay between audio and
video. This means that if the camera does have this delay, the audio will lead the video as recorded
by the PIX 260i. Note that on some cameras, the lens-to-SDI/HDMI delay changes with resolution/
frame rate. The best practice is to test the audio/video sync using sticks on a test file for each camera
resolution/frame rate to be used on a project before starting.

Audio Track Arming

Up to 32 Tracks of audio can be recorded in both Audio and Video modes. Tracks must be armed in
the Audio Screen in order for them to be recorded. To arm or disarm Tracks for recording:
1. Press the AUDIO button to access the Audio Screen.
2. Select the Arm box for the desired track using the Control Knob to move vertically and REW
and FF to move left and right.
3. Press the Control Knob to access the Arm options window. Arm options are Off, On, All Off,
or All On.
4. Select the desired option then press the Control Knob to exit the arm window.
PIX 260i User Guide and Technical Information
See Audio Input Delay Control for details
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