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Or see a lecture that has already been run — transcript in, fields out.
What was said
Lecturer: Today: CAP theorem. I want to be careful — there's a lot of folklore that's just wrong. The theorem says: in the presence of a network partition, a distributed system must choose between consistency and availability. That's it.
The folklore version says you pick two of three — consistency, availability, partition tolerance — and the third is a sacrifice. That framing is misleading because partition tolerance isn't really a choice. If you're distributed across a network, partitions happen. You don't pick "no partitions"; the network picks that.
So the real tradeoff is only during a partition. When two nodes can't talk, you either serve stale data — that's AP — or refuse to answer — that's CP. Most systems that call themselves "CA" are single-node, which, uh, defeats the point.
Example. Shopping cart. Network splits, a user adds an item on one side. Accept the write? If yes, when the partition heals you might have conflicts to reconcile. If no, the user gets an error. Amazon's Dynamo paper is essentially a long argument for saying yes.
Design question: what does my system do when the network fails? Not if — when. Everyone gets this wrong the first time.
Next lecture: consensus protocols. Read chapter 6 before Thursday. I might add a problem set but I'd have to check the syllabus.
What was extracted
Reading…
Highlighting shows roughly where each field came from — every summary also keeps timestamps back into the audio.
VexaScribe transcribes your lecture recording with timestamps and speaker labels, then generates a structured summary — chapter breakdown, key concepts, terminology, worked examples and takeaways. Upload any common audio or video file. A one-hour lecture is transcribed in roughly 3 to 5 minutes, and the summary is generated from the full transcript rather than a truncated sample, so a three-hour seminar is covered end to end. Export the result as DOCX, TXT, SRT, VTT or JSON.
The summary is a study aid, not a substitute for the lecture. Check anything you plan to quote against the timestamp it came from.
Best for: Formats you can upload
What the summary contains
A lecture summary is not one block of prose. Nine parts, each answering a different question you will have at revision time — including review questions you can test yourself against.
Overview
A short paragraph covering what the lecture argued and where it ended up — enough to decide whether you need to revisit the full recording.
Chapters
The lecture split into its actual segments with start times, so you can jump to the twenty minutes that matter instead of scrubbing through the hour.
Key concepts
The ideas the lecture was built around, each with the explanation given in the room rather than a textbook definition.
Terminology
Terms introduced during the lecture with the definition as it was stated. Useful when a module has its own vocabulary that will appear in the exam.
Worked examples
The cases and problems used to illustrate the theory, kept separate from the theory itself so you can practise against them.
Takeaways
The points the lecturer returned to or flagged as important — usually the closest thing to a revision list you will get.
How it works
Upload the recording
Drop in the file from your phone recorder, Zoom, Teams or the lecture capture system. Audio and video both work — the audio track is extracted for you, so there is no conversion step.
Transcription and summary
The recording is transcribed with word-level timestamps and speaker labels, then summarised. Choose the Lecture summary type and the output is organised around the argument rather than around who spoke when.
Review and export
Click any line in the summary to jump to that moment in the recording and check it. Export to DOCX for your notes app, or keep the timestamped transcript alongside it.
Which parts you can revise from directly
Not every part of a summary carries the same risk. If you are going to memorise something for an exam, it is worth knowing which fields came straight out of the recording and which were written from it.
Traceable to the recording
These carry a timestamp, so checking one takes a few seconds.
- •Key quotes — kept word for word, not paraphrased
- •Chapters — segment boundaries with start times
- •The transcript itself — every word timestamped
Worth a check before you memorise it
These are written from the material rather than lifted out of it.
- •Terminology — a definition that reads well can still be subtly off
- •Key concepts — compression can drop a qualifier that mattered
- •Review questions — useful prompts, but the hints are generated too
The practical rule: for anything going into an exam answer or a citation, click through to the timestamp and hear it. Definitions and anything numerical are worth the extra thirty seconds — those are the places where a confident-sounding error does the most damage, because you will not notice it until it is marked wrong.
A lecture summary is not a generic summary
Generic AI summary
- ✗Compresses everything to a few paragraphs of prose
- ✗Treats a definition and an aside as equally important
- ✗Drops the worked examples, which is where the method lives
- ✗No timestamps, so nothing can be checked against the recording
- ✗Often runs on a truncated transcript for a long recording
Best for: Getting the gist of something short
Lecture summary
- ✓Splits the recording into chapters you can navigate
- ✓Separates concepts, terminology and examples
- ✓Keeps the worked examples intact and distinct from the theory
- ✓Every line traces back to a timestamp in the recording
- ✓Runs on the full transcript, however long the lecture
Best for: Revising from a recording you need to trust
Who uses this
Students
Recorded the lecture but never replayed it. The chapter list makes an hour navigable, and the terminology section is close to a ready-made glossary for the module.
Online learners
Working through recorded course material without a cohort to compare notes with. The summary gives you the structure a seminar would otherwise supply.
Researchers
Conference talks and seminars where you need the argument and the citation, and the timestamp to check a quotation before using it.
Professionals in training
Certification courses and internal training recordings, where the terminology and takeaways matter more than a transcript of the whole session.
What the summary contains
A lecture summary is not one block of prose. Nine parts, each answering a different question you will have at revision time — including review questions you can test yourself against.
Overview
A short paragraph covering what the lecture argued and where it ended up — enough to decide whether you need to revisit the full recording.
Chapters
The lecture split into its actual segments with start times, so you can jump to the twenty minutes that matter instead of scrubbing through the hour.
Key concepts
The ideas the lecture was built around, each with the explanation given in the room rather than a textbook definition.
Terminology
Terms introduced during the lecture with the definition as it was stated. Useful when a module has its own vocabulary that will appear in the exam.
Worked examples
The cases and problems used to illustrate the theory, kept separate from the theory itself so you can practise against them.
Takeaways
The points the lecturer returned to or flagged as important — usually the closest thing to a revision list you will get.
Review questions
Questions drawn from the material, each with a hint rather than a handed-over answer. Testing yourself beats re-reading, and this is the part of the output that makes that possible without writing the questions first.
Further reading
Topics and sources the lecture pointed at, each with a line on why it was mentioned — so a reading list is not just titles you have no context for.
Key quotes
Passages kept word for word rather than paraphrased, with the timestamp attached. This is the field to use when you need to cite the lecturer accurately.
What it costs
The first five minutes of any file are free with no account. A free account adds 30 minutes of credit, which covers a short lecture end to end. Beyond that, paid plans start at $2 a month.
$2/mo
Starter
3.3 hrs
$5/mo
Basic
16.7 hrs
$10/mo
Pro
41.7 hrs
$20/mo
Studio
100 hrs
Export the summary and the transcript as DOCX for Word, Notion or OneNote, TXT for anything else, or SRT and VTT if the recording was a video you plan to caption. JSON is available when you want the word-level timestamps for a pipeline of your own.
When something else is the better tool
We turn a recording into structured notes. That is one step in revising, not all of it.
You want flashcards and practice quizzes
Tools built for active recall — Knowt and similar — generate flashcards and practice tests from your material, and that is a genuinely different output from a summary. We produce the notes; those tools turn notes into drilling. If self-testing is the goal, our export is the input to that workflow rather than a replacement for it.
You already have the transcript
If the lecture came with a transcript, or your institution provides one, there is no reason to upload the audio again. Paste the text into the transcript summarizer instead — same summary, no transcription step.
It is a meeting, not a lecture
A meeting summary looks for decisions and action items; a lecture summary looks for the argument and its examples. Same engine, different question being asked of the transcript — the meeting version is here.
You attended and followed it
Worth saying plainly: if you were there and understood the material, your own notes taken during the lecture are better revision than any summary of a recording. This is most useful for the lecture you missed, the one you half-followed, or the recording you need to search months later.
Frequently asked questions
What does VexaScribe's lecture summary include?
VexaScribe generates a structured lecture summary with: an executive overview, timestamped chapter breakdown, key concepts list, terminology with definitions, examples given, and takeaways. All sections are generated from the audio — you don't need to paste any text.
How is this different from a generic AI summarizer?
Generic summarizers work on text you paste in. VexaScribe takes your audio or video file directly, transcribes it first, then runs a lecture-specific summary that extracts chapters with timestamps, terminology, and examples — structure that generic tools miss.
How long does it take to summarize a lecture?
A 1-hour lecture transcribes in about 5-10 minutes, then summarization adds another 1-2 minutes. Total: roughly 10-12 minutes for a full transcript plus structured summary.
Can I summarize a video lecture (MP4, MOV)?
Yes. Upload MP4, MOV, MKV, or other video formats. VexaScribe extracts the audio automatically and transcribes it, then summarizes. Works with Zoom recordings, downloaded course videos, and YouTube lectures saved locally.
Does the summary include timestamps?
Yes. The chapter breakdown in the summary includes timestamps linked to the original recording. You can click any chapter to jump to that moment in the audio player.
How much does lecture summarization cost?
Summarization is included with every plan at no extra charge. You pay only for transcription minutes. Plans start at $2/month for 200 minutes (~3.3 hours of lectures). A typical semester of weekly 1-hour lectures (30 hours) costs about $6–$18 depending on plan.
What languages are supported?
VexaScribe supports 99 languages for transcription. Summaries are generated in the same language as the lecture — no translation needed.
Can I export the summary?
Yes. Export the summary as plain text, or download the full transcript with timestamps in TXT, SRT, or VTT format. Summary and transcript are both included in every export.
Can I export lecture summary to Notion, OneNote, or Obsidian?
Yes. The DOCX export imports cleanly into OneNote. For Notion, copy-paste from the transcript editor preserves headings, bullet lists, and speaker labels. For Obsidian, export as TXT and paste into a Markdown file — VexaScribe's structured output (Executive Summary → Chapters with timestamps → Key Concepts → Terminology → Takeaways) maps naturally to nested Markdown headings. For Anki flashcard export, we don't do that directly — pipe the Key Concepts + Terminology section into an AI flashcard generator (NoteGPT, RemNote) as a second step.
What summary format is best for studying?
Depends on your study method. Bullet summary is fastest for quick review (~5% of lecture length). Cornell notes work best for active recall — 2-column question/answer with cue column, per Walter Pauk's original Cornell method. Concept maps work best for interconnected topics (organic chemistry pathways, historical timelines). Study guide format is best for exam prep — includes definitions, examples, and sample questions. VexaScribe generates all four from the same lecture recording.
What's the difference between lecture transcription and lecture summary?
Lecture transcription is the full verbatim text of everything the professor said — typically 8,000-12,000 words for a 60-minute lecture — used for quote extraction, exam-question wording verification, or accessibility. Lecture summary is structured study notes (executive summary + chapters + key concepts) — typically 500-1,500 words — used for quick review and exam prep. VexaScribe produces both from one upload. See /lecture-transcription for the full transcript workflow.
How accurate are AI lecture summaries?
We do not publish an accuracy percentage, and it is worth explaining why. We have not measured our own word error rate against reference transcripts, and a figure without a corpus and a method says very little. Note also that several tools on this search advertise numbers like "up to 98.86%" with no source — one of them uses that identical figure on its lecture, MP4 and M4A landing pages, which suggests it is a house number rather than a measurement. What genuinely moves the result is the recording: how close the microphone was to the lecturer, how much room noise there is, and whether the material is full of names and technical terms. Sitting nearer the front, or recording straight from Zoom rather than from the back of a hall, does more for the summary than any choice of tool. The honest test is to run five minutes of your own recording, free and without an account, and look at what comes back.
Can I summarize a Zoom lecture recording?
Yes. Export the Zoom Cloud Recording as MP4 and upload directly to VexaScribe — audio is extracted automatically. If you want native Zoom transcription instead, Zoom AI Companion is included on Pro plans and above. For post-lecture summary workflow with better speaker labels and export to Notion/OneNote/Obsidian, upload the Zoom MP4 to VexaScribe.
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Lecture transcription
The transcript on its own, with speaker labels and timestamps
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