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StreamSnagHow it works

How an evening goes.

Six steps, half an hour. The first two are free, and you can stop after any of them.

Also on this page: the six steps · see what it makes · two things Pro does differently · read the lecture instead of rewatching it

First, the short version: three clicks.

A working copy of the StreamSnag popup, on an invented lecture page. Press Download and follow it.

3 clicks from a lecture page to a document you can read.No AI account

PHYS201 · Lecture 6Cardiac output and what sets it

StreamSnagcourse.example

On this page

Cardiac output and what sets it

Video · 27 min · 129 MB

On this page · 1 of 8

4 · The cardiac cycle

Video · 31 min · 142 MB

PHYS2018 videos here

You review the list first.

  • 4 · The cardiac cycleVideo · 142 MB
  • 5 · Heart sounds and murmursVideo · 110 MB
  • 6 · Cardiac output and what sets itVideo · 129 MB
  • 6 · Cardiac output and what sets itVideo · 129 MBSame as another oneA second copy of one listed here. "Download all" leaves it unticked: tick it there if you want it.
  • 7 · Blood pressure and its controlVideo · 134 MB
  • 8 · Exercise and the circulationVideo · 151 MB
  • 9 · The microcirculationVideo · 122 MB
  • Trailer: PHYS201Video · 6 MBLooks like a preview or adProbably not a lecture. "Download all" leaves it unticked: tick it there if you want it.

The lecture, as a documentProWhat step 3 makes

PHYS201 · Reading edition

Cardiac output and what sets it

27 min lecture14 min read3,194 words

Slide 4Preload and the Frank-Starling law

08:47

Within limits, the heart pumps out whatever volume is returned to it. So on the graph you have end-diastolic volume along the x axis, stroke volume up the y axis, and the curve rises steeply at first and then flattens off at high volumes.

09:17

A little bit of history, because I like it. Otto Frank was a German physiologist working on frog hearts in the eighteen nineties, and Ernest Starling was in London about twenty years later with his heart-lung preparation in dogs. They never worked together.

Why you would read it instead

And then, if you want more. Neither is a required step. See the whole evening, step by step.

Have the slides? They line up with the lecture.

Every slide is labelled with the minute it was shown.

ProNo AI account

Study pageSlide 4 of 9
  • 4Preload and the Frank-Starling law08:07
  • 5Why the Frank-Starling mechanism works11:02
  • 6Afterload14:03

A PDF or PowerPoint deck is matched to the transcript, so the video, the slides and the text move together.

Open the sample study page

Have an AI account? Turn it into study material.

A study guide, a practice quiz and flashcards with Anki export. Every item points to its minute and slide.

ProUses your AIRuns on your own AI account, never paid to StreamSnag

Study guide, key idea 2

How does a larger end-diastolic volume give a larger stroke volume without extra calcium?

In the lecturer's words

“Preload is the stretch on the ventricular muscle cells at the end of diastole, just before contraction.”

Quiz, question 3

Afterload rises and nothing else changes. What happens to stroke volume?

Not quite. That describes more preload, and here filling has not changed.

Correct. The ventricle empties less well against the higher pressure, so end-systolic volume rises.

Not quite. Heart rate changes the output per minute, not the volume of one beat.

Flashcard, 6 of 9

What does more contractility do to the Frank-Starling curve?

Show answer

It lifts the ventricle onto a higher curve. More preload only moves it along the same one.

This demonstration needs JavaScript, which is switched off in your browser, so the picture stays on its first step. The three steps are these. 1. Download: the popup finds the lecture that is playing and saves it, free. 2. Transcribe on this computer: for a lecture with no captions, Pro turns the speech into text on your own machine. 3. Read the lecture: Pro makes the document shown beside the popup, and opens it.

This is a demonstration you can use, with an invented lecture on an invented course site. The popup is a copy drawn for this page, and nothing is really downloaded.
More about this demonstration

In the real thing, step 2 needs the small helper program and a one-time download for transcription; an hour of lecture took under a minute on our fast desktop, and an older laptop can need several minutes. Step 3 opens the reading edition in a tab of its own as soon as it is made; here it is the document beside the popup. The tag on a study card moves the lecture to its minute. The study material is shortened from the sample study guide, which AI wrote from the lecture's transcript and slides.

Tuesday, 7:10 pm. Lecture 6 went up this morning and you have not watched it.

  1. 1Save the lectureFreeNo AI account
  2. 2Keep the whole lessonFreeNo AI account
  3. 3Read the lectureProNo AI account
  4. 4Study pageProNo AI account
  5. 5Study packProUses your AI
  6. 6Review cardsProNo AI account

  1. 1 · Save the lectureFreeNo AI account

    Lecture 6, saved in one click.

    Open the lecture, press play and click the StreamSnag icon. The lecture is at the top under On this page, with one button that says what it will save.

    On a page with a whole course, a row of small squares shows what you have and what is missing, and Download the 21 missing… opens a checklist first: every lecture in course order with the file name it will get, and anything that cannot be downloaded listed with the reason.

    Press play first: many players only load the video once it starts. If nothing is listed, the popup offers Scan again and Ask your AI to find it, which shows what would be sent before it sends anything. Protected (DRM) video is refused, and StreamSnag says so.

  2. 2 · Keep the whole lessonFreeNo AI account

    The slides and the words, not only the video.

    The PDFs and PowerPoint files the lesson links to are listed under the video and save into the same folder. The lecture's own captions are saved as a transcript you can read and search, with a time on every paragraph.

    The free transcript is the captions the lecture already has, saved as text. A lecture with no captions has to be transcribed, and that is Pro.

Everything above this line is freeEverything below it is Pro First lecture free

  1. 3 · Read the lectureProNo AI account

    Read it instead of watching it.

    The reading edition is the lecture as a clean document: a contents list, headed parts, proper paragraphs, and a time beside each one that opens that moment in the video. It keeps what was taught, in the lecturer's own words. It is not a summary.

    One button, Read the lecture, makes it on your computer in a few seconds and opens it. This 27-minute lecture is a 14-minute read.

    It needs no AI account: the words are the lecture's own, with hesitation sounds taken out by rule. If you have chosen an AI account, Read the lecture asks each time whether to tidy the wording as well. That extra uses your AI account. It never summarises, and a part that fails its check is shown as transcribed.

  2. 4 · Study pageProNo AI account

    Go back to the parts that did not make sense.

    The study page lines the slides up with the video and the transcript. The current slide and paragraph follow the video, and a click on a slide or a time jumps there.

    It works with slides in a PDF or a PowerPoint file, and it is one page saved next to the lecture, so it opens offline.

    Slides are matched to what is said. Where the match is unsure, the slide is marked as approximate. Without slides you still get the video and the transcript together. How to sync slides with a recording.

  3. 5 · Study packProUses your AI

    A study guide, a quiz and flashcards.

    The study guide gives the big picture and the key ideas as questions with explanations, in the lecturer's own words where it matters. With it come a practice quiz and flashcards, which also export to Anki. Every part cites the minute and slide it came from.

    Before anything is sent you see what goes, to which AI account, and roughly how much AI use it takes. Then it runs in the background for one to three minutes.

    This step runs on your own AI account. AI use is never part of the StreamSnag price and is never paid to us. On a Claude or ChatGPT subscription you already have it costs nothing extra and counts toward your plan's limits. With a pay-as-you-go key, a 28-minute lecture cost about US$0.80 on Claude Sonnet on our own runs. More on AI costs. The pack is written from the lecture; a box that explains something from outside it is always labelled “Beyond the lecture”. What AI writes can be wrong, which is why every part cites its minute. How to make a study guide and quiz.

  4. 6 · Review cardsProNo AI account

    First review done.

    You have read the lecture, gone back into the video where it mattered, and seen all nine cards once. StreamSnag brings them back over the coming days, with the due cards from every lecture in one place.

    Every card has Show me in the lecture, which opens the video at that minute and slide.

    Review progress stays on your computer. Prefer Anki? Each study pack also saves a flashcards file you can import there. How to turn a lecture into flashcards.

AutomationProYour AI for the AI steps

Or save it and walk away.

Choose what should happen when a lecture finishes saving: the transcript, the reading edition, the study page, the study pack. It is waiting when you come back. In the popup this is one switch, called Autopilot. All of it is off until you turn it on, and the first time it pauses before the AI step to show you what will be sent.

No captionsProNo AI account

If the lecture has no captions.

Pro turns the speech into text on your own computer, with no minute limits. Nothing is uploaded and no AI account is used. It needs the small helper program and a one-time download of about 135 MB. It is set up for English; a larger model covers 25 European languages. An hour of lecture took under a minute on our fast desktop, and an older laptop can need several minutes.

A caveat

About those times.

They are an example with our 27-minute sample lecture, which has captions. A longer lecture is a longer read, a study pack takes one to three minutes, and 7:40 is a first pass at one lecture, not the end of a backlog.

The pictures in this section are drawings of StreamSnag, filled in with the sample lecture. The real outputs are just below.

Two things Pro does differently.

Many online tools that turn a recording into notes work on their own servers, count your minutes and hand back a summary. Here is what StreamSnag does instead.

  • ProNo AI account

    No minute limits: transcription runs on your own computer.

    A lecture with no captions is turned into text on your own machine. We meter nothing, because nothing comes to us: no minutes to buy, no monthly allowance, no upload. Transcribe one lecture or a whole term.

    The AI parts are different, and we say so plainly. The study guide, the quiz and the flashcards are written by your own AI account. That provider may have its own limits. If you already pay for a Claude or ChatGPT subscription there is nothing extra to pay; with a pay-as-you-go key the provider charges you for what you use. StreamSnag adds no limit of its own and takes no share.

  • ProNo AI account

    It keeps what was taught, and every paragraph leads back to the recording.

    The reading edition is the lecture, not a summary of it: the lecturer's own words, examples and qualifications, set out to be read. Beside every paragraph is its time, which opens that moment in the recording.

    • A contents list, with the minute each part starts.
    • Headings. From the slides when there are some. Without slides, a part is headed by its own most distinctive terms where some stand out, and by its number and minute where none do.
    • “Lecturer's emphasis” beside a sentence where the lecturer says that something matters.
    • A spoken “first… second…” set out as a numbered list.

    None of this rewords anything. Hesitation sounds and doubled words are taken out by rule, and that is all. See one made without slides.

ProNo AI account

Read the lecture instead of rewatching it.

StreamSnag turns a saved lecture into a clean document that keeps what was taught: a contents list, headed parts, proper paragraphs in the lecturer's own words, and a minute beside each one that takes you back to that moment in the video.

A 27-minute lecturea 14-minute readFrom the two samples on this site: 27 and 28 minutes of lecture, about 3,200 words and 14 minutes of reading each.

  • It is made on your own computer. Nothing is uploaded.
  • It needs no AI account. The words are the lecture's own.
  • It is one button from the saved lecture. The button says Read the lecture, and the document opens as soon as it is made.
  • It is not a summary. Examples, asides and qualifications stay in.

What you can do with it

  • Search it. Find where a term was explained in seconds.
  • Print it. It is laid out for paper as well as the screen.
  • Read it on your phone. It is one file that works offline.
  • Jump to the video. Any paragraph opens that minute of the lecture.

Optional, with your own AI account: it can also tidy the wording, taking out false starts and repairing the punctuation. With an AI account chosen, it asks each time. That part runs on your own AI account: no extra charge on a Claude or ChatGPT subscription you already have, a charge from the provider with a pay-as-you-go key. It never summarises, and a part that fails its check is shown as transcribed.

Open the full sample A second sample, on statistics The first one, made without slides

Your first lecture is free, with no card. After that the reading edition is part of Pro: US$39.97 a year, US$4.99 a month, or US$99.95 once for life. Making it needs no AI, so it costs nothing more; the study tools that do use AI run on your own AI account, never paid to StreamSnag: nothing extra with a Claude or ChatGPT subscription you already have, or a few cents to about US$1.50 a lecture with a pay-as-you-go key. The steps are in how to read a lecture instead of watching it, and how to transcribe a lecture.

PHYS201 · Reading edition

Cardiac output and what sets it

27 min lecture14 min read3,194 words

From the lecture's captions. Hesitation sounds and doubled words were taken out by rule. Nothing is reworded.

Three determinants of stroke volume

06:18–13:58
06:18

Lecturer: Okay. So what sets stroke volume? Three things, and you need to know these three cold. Preload, afterload, and contractility. Preload is how much the ventricle is stretched just before it contracts. Afterload is the load it has to push against to get the blood out.

06:42

Lecturer: And contractility is how strongly the muscle contracts for a given stretch and a given load. The other word for contractility is inotropy, and you'll see that on the slide, positive ionotropic and negative ionotropic drugs. The way I think about it, and this is just an analogy, is throwing a ball. Preload is how far back you pull your arm. Afterload is how heavy the ball is. And contractility is how strong your arm is.

07:21

Lecturer: You can throw further by pulling back more, by picking a lighter ball, or by going to the gym. Three different things. And the reason I labour this is that every year in the exam about a third of you mix up preload and contractility, so we are going to go slowly through each one.

An excerpt, word for word. The whole sample has 49 paragraphs in 4 parts, and its minutes open the sample study page, which has no video.

In this excerpt the captions wrote “ionotropic” where the slide says inotropic. A reading edition made without AI keeps the words as they were captioned or transcribed, mistakes included. That is why every paragraph links to its minute.

  • It is a Pro feature. Free saves a video's existing captions as a transcript, when the video has them. The reading edition, and transcription for lectures with no captions, are Pro.
  • No captions? Speech-to-text on your computer. Pro turns the speech into text on your own computer, with no AI account and no minute limits. It needs the small helper program and a one-time download of about 135 MB. An hour of lecture took under a minute on our fast desktop; an older laptop can need several minutes.
  • Most words right, not all. It depends on the recording. Speech models of this size misspell unusual drug and technical names. Every paragraph links to its minute so you can check, and the optional AI tidy corrects misheard terms against the slides. The marks for the lecturer's emphasis and the spoken lists work on English lectures whose captions have punctuation.

Saving is free, and Pro takes your first lecture from start to finish, free, with no card.

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