Optimizing Audio and Video Flashcards
7 cards from real Online Music Lessons practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Optimizing Audio and Video flashcards as text
Which streaming protocol is most commonly used by platforms like Zoom and Skype for real-time online music lessons?
Answer: WebRTC (Web Real-Time Communication)
WebRTC is a browser-native protocol designed for low-latency, peer-to-peer real-time audio and video communication, making it the backbone of most video conferencing platforms.
A teacher notices that their recorded lesson audio has a consistent 'clipping' sound on loud notes. What was the root cause?
Answer: The input signal exceeded 0 dBFS, causing digital distortion
Digital clipping occurs when an audio signal exceeds the maximum digital level of 0 dBFS (decibels full scale), causing harsh distortion on loud transients.
What does 'frame rate' (fps) affect in a lesson video, and what is the standard frame rate for most online video content?
Answer: It determines video smoothness; 30 fps is the standard for online content
Frame rate is the number of still images displayed per second; 30 fps is the widely accepted standard for online video, providing smooth motion without excessive file sizes.
Which of the following best describes 'room tone' and why it matters for online music lesson recordings?
Answer: The natural ambient sound of an empty room captured as a reference recording
Room tone is the background ambience of a quiet room, recorded as a reference; it can be used in post-production to fill gaps or match audio between clips seamlessly.
A teacher streams lessons at 720p but students report blurry video. Which factor is most likely responsible?
Answer: The video bitrate is too low to encode the 720p resolution clearly
Even at a high resolution, a low video bitrate forces aggressive compression that introduces blocking and blurriness, especially during fast motion like strumming or bowing.
What is phantom power (+48V) and which type of microphone requires it?
Answer: DC power delivered through an XLR cable to power condenser microphones
Phantom power is +48V DC sent through XLR mic cables to power the internal electronics of condenser microphones, which cannot operate without it.
When recording a ukulele lesson at home, a teacher wants to minimize the sound of the air conditioner. Which technique is most effective?
Answer: Turn off the AC during recording and position a cardioid mic close to the instrument
Turning off the noise source and placing a directional cardioid microphone close to the instrument naturally improves the signal-to-noise ratio, capturing the ukulele clearly while excluding room noise.