Level 1: Digital Video Practice Exam
Dante AV can support multiple codecs. However, the initial products will transport video in what format?
A. Uncompressed, bit-perfect. B. Compressed using a visually lossless JPEG2000 codec. C. Compressed using a medium latency MPEG H264-based codec D. Compressed using a new codec developed by Audinate.
In Dante AV, with the JPEG2000 codec and a 1 Gbps connection, what resolution and frame rates are currently supported?
A. to 1920x1080i or 720p (HD) at 23.97fps B. Up to 1920x1080p (Full HD) at 30fps C. Up to 3840 x 2160 at 30fps or 1080p (HD) at 60fps D. Up to 4K (4096 x 2160) at 60fps
On a Dante network, a single clock leader is established to manage all audio sample rates and video frame rates.
True. A single Clock Leader on the network is able to keep all followers synchronised, regardless of their sample-rates or frame-rates. False. Each essence will require a dedicated Clock Leader. Devices transmitting audio samples will need a Sample-Rate Clock Master and devices transmitting video samples will need a Frames-per-Second Clock Master.
Dante AV devices have a scaler in it. What does the scaler affect?
A. The scaler can adapt to different frame rates. (i.e. - it can scale a 30fps source to 25fps for display.) B. The scaler can adapt screen resolution. (i.e. - it can scale a 4K source to 1080p for display) C. The scaler can adapt to different color depth. (i.e. - it can scale an HDR10 4:4:4 source to black and white 4:2:0 for display, or visa versa.)
What factors significantly affect the overall bandwidth demands of a compressed video flow? (Select all that apply.)
A. The video frame resolution (i.e. - 1080p vs 4K) B. The chroma sampling (i.e. - 4:4:4 vs 4:2:0) C. The frame rate (ie 24fps vs 60fps) D.Powering with PoE instead of a separate power supply.
Which answer best describes the JPEG2000 encoding process?
A. There is no loss ever. B. There is a "visually lossless" impact on the first encoding, but JPEG 2000 can decode and encode over and over with no further loss. C. There is a slight degradation with each encode/decode process, but it is visually lossless up to 5 generations.
Interlaced video draws all the odd lines, then all the even lines. This creates two "fields" for each frame.
TRUE. The interlaced signal contains two fields of a video frame captured consecutively. This enhances motion perception to the viewer, and reduces flicker. FALSE. The interlace scanning is a format of displaying, storing, or transmitting moving images in which all the lines of each frame are drawn in sequence.
Dante AV devices sends and receives audio uncompressed so it is completely compatible with Dante audio devices.
True. As audio and video are transported separately as independent essences, it is possible for a Dante AV device to send its audio channels to a Dante Audio device and vice-versa. False. Only DanteAV modules can communicate with each other in a network. It is however possible to Dante Audio devices to still co-exist in the same network, however with no possibilities of interoperability between them.
The JPEG 2000 codec commonly used in Dante AV processes video frames in groups. If a packet is corrupted, the picture will automatically recover when the current group of frames ends and the next keyframe arrives. It could be several frames.
True. The JPEG2000 codec is the best example of interframe encoding, providing a single I-Frame (key frame), which encodes one entire image, followed by multiple P-frames (delta frames), which encode only the changes since the previous frame. False. The JPEG2000 codec is the best example of intraframe encoding, applying a compression algorithm to each frame captured individually, not built up from multiple frames, so they can be compressed and transmitted out quickly to reduce latency.
The JPEG 2000 codec initially included in the Dante AV module is used in 65% of digital cinema rooms today. It is visually lossless, supporting both video and computer graphics (like spreadsheets and slide presentations).
True. The JPEG2000 offers sharp quality and intense colour definition with a visual accuracy adopted by most professional uses. False. The codec used by DanteAV modules will never allow compression as its promise is to deliver bit-perfect, uncompressed audio and video.
