ACI Case Analysis & Practical Application 2 — Questions and Answers
Question 1: A student's Pro Tools session shows audio playback stuttering even though the CPU meter is low. As an ACI instructor, what is the most likely cause to investigate first?
- Insufficient RAM installed in the system
- Disk cache or drive throughput limitations affecting real-time playback (Correct answer)
- An incompatible plug-in causing DAE errors
- Incorrect session sample rate mismatch with hardware
Correct answer: Disk cache or drive throughput limitations affecting real-time playback
Low CPU usage paired with playback stuttering typically points to disk I/O bottlenecks, not processing load.
Question 2: During a Media Composer training session, a student accidentally moves a clip and can't find the Undo command. Which keyboard shortcut should the ACI instructor remind them to use?
- Ctrl+Z (Windows) / Cmd+Z (Mac) (Correct answer)
- Ctrl+Y (Windows) / Cmd+Y (Mac)
- F9
- Ctrl+Alt+Z (Windows) / Cmd+Option+Z (Mac)
Correct answer: Ctrl+Z (Windows) / Cmd+Z (Mac)
Ctrl+Z on Windows and Cmd+Z on Mac is the standard Undo command in Media Composer.
Question 3: A class is learning Pro Tools for the first time and students are confused about the difference between a Send and an Insert. Which analogy best helps an ACI explain this concept?
- Sends are like copies that route signal to another channel, while inserts process the signal inline (Correct answer)
- Inserts route audio to an Aux track while Sends apply effects in-place
- Sends increase signal level while inserts decrease it
- Both sends and inserts are functionally identical in Pro Tools
Correct answer: Sends are like copies that route signal to another channel, while inserts process the signal inline
A Send taps a copy of the signal and routes it elsewhere, while an Insert processes the audio in the signal path itself.
Question 4: When teaching Media Composer's Symphony workflows, a student asks why they should use an Avid DNxHD codec instead of H.264 for editing. What is the best instructional response?
- H.264 is not supported by Media Composer at all
- DNxHD is a mezzanine codec optimized for editing efficiency, reducing CPU load during playback and scrubbing (Correct answer)
- H.264 produces lower quality exports than DNxHD
- DNxHD files are always smaller than H.264 files
Correct answer: DNxHD is a mezzanine codec optimized for editing efficiency, reducing CPU load during playback and scrubbing
DNxHD is an Avid-designed mezzanine codec that prioritizes editing performance over compression efficiency.
Question 5: A student working in Pro Tools reports that their plug-in is not appearing in the Insert slot. As an ACI, what is the first corrective step to recommend?
- Re-record the track at a higher sample rate
- Run Avid's plug-in validation scan or check that the plug-in is installed in the correct AAX plug-ins folder (Correct answer)
- Increase the Hardware Buffer Size in the Playback Engine
- Switch from HDX to Native processing
Correct answer: Run Avid's plug-in validation scan or check that the plug-in is installed in the correct AAX plug-ins folder
Missing plug-ins are almost always due to an incorrect installation path or a failed validation scan.
Question 6: During an ACI-led workshop, a student needs to conform a sequence after a picture lock change in Media Composer. Which tool should the instructor demonstrate for this workflow?
- Consolidate/Transcode
- ScriptSync
- Change List tool (Correct answer)
- AutoSync
Correct answer: Change List tool
The Change List tool in Media Composer tracks editorial changes after a locked cut, facilitating conform workflows.
Question 7: A Pro Tools student is preparing stems for a film mix but notices that the exported audio files are out of sync with the video. Which export setting is most likely misconfigured?
- Bit depth set to 24-bit instead of 16-bit
- Bounce source set to a Bus instead of the Main Output
- Incorrect start timecode or session start frame not matching the video's start frame (Correct answer)
- Dither type selected incorrectly
Correct answer: Incorrect start timecode or session start frame not matching the video's start frame
Sync errors on export almost always trace back to a mismatch between the session start timecode and the video's starting frame.
ACI Case Analysis & Practical Application 2
A student's Pro Tools session shows audio playback stuttering even though the CPU meter is low.
As an ACI instructor, what is the most likely cause to investigate first?