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jon_dahl

2,493 karma · joined April 2, 2008

[ my public key: https://keybase.io/jondahl; my proof: https://keybase.io/jondahl/sigs/fUXGdOD5tLkIkjMc4fzRZzXbVny1yw-J6OlZrFCmBH4 ]

Co-founder of Mux. Previously, co-founder of Zencoder. YC W16 and W10. SF.

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jon_dahl··on Is Sugar Toxic?
Probably because the parent was a detailed, well-researched answer, and your request for clarification didn't explain what sort of clarification you were looking for.

The second one, on the other hand, was downvoted for asking why you were downvoted. ;)

jon_dahl··on What is Bitcoin? (Video)
Not at all. A stock represents a share of a company's earnings, which has real fundamental value. There are bubbles and random swings, but at the end of the day, a stock is worth something like the present value of future dividends. (Even for a non-dividend-paying stock - the idea being that eventually the company will mature and start paying a dividend.)
jon_dahl··on 4chan founder: Mark Zuckerberg is “totally wrong” about online identity
Yep. I was there, and he did say this (amongst other things) during his talk.

Good talk, all in all. 4chan is a refreshing change from VC backed, liquidation-event-directed online communities. Not that 4chan is a Facebook replacement by any means, but it's helpful to remember that an enormous part of what's interesting on the internet is open-source, non-profit, or not profit-motivated.

jon_dahl··on Zencoder lowers the price for encoding to multiple output formats
Fair question. What you get is scalability (Softlayer is explicitly for low-volume transcoding), an API (Softlayer might have one, though it's not documented at the above link), a lower error rate, higher visual quality, better compression, more options, and hands-on customer support. Not everyone needs these things, but many people do.
jon_dahl··on MPEG LA Announces Call for Patents Essential to VP8 Video Codec
They will then file a number of lawsuits in a shotgun fashion, perhaps a few hundred, half of which will be against Google, and the other half against various companies using WebM

More likely, they will announce licensing terms and ask for everyone using WebM to acquire a license and pay royalties. Then, after a window of time, they will go after companies that don't license the patents.

jon_dahl··on Zynga Close To Acquiring Whereoscope (YC S10)
How, and why, do these things get leaked? Is it in either Zynga's or Whereoscope's interest to get a little PR before a sale? In other words, is this sort of thing strategic, or a lack of discipline on one party's part?

Whatever the case, congratulations to both sides if this comes true.

jon_dahl··on The Dilbert Black Swan Portfolio: a skeptical/practical guide to investing
Despite some flaws, I like the overall investment thesis. Traditional portfolio theory would say that 70% "safe" stocks (say, blue chips) plus 30% bonds is about the same as 50% "risky" stocks (say, small caps or emerging markets) plus 50% bonds. Assume for the sake of argument that the math works out, and that the two portfolios have the same expected return.

But those portfolios are only equal if you believe the future will look a lot like the past. If you take black swans into account, the portfolio with the higher "safe" allocation is preferable. If Peak Oil or Nuke War or Famine drives stocks down by 90% for several decades, the 70/30 portfolio leaves you with 37% of your wealth, while the 50/50 portfolio leaves you with 55%.

My black swan portfolio would look like this:

* 25% bonds (US treasuries)

* 25% tips (inflation-protected bonds)

* 25% US small cap value stocks

* 25% international small cap value stocks

I'd consider adding in precious metals if they weren't so hot right now.

jon_dahl··on A modest proposal for 500 Y Combinators
Overheard at a 500 Startups event: 500 startups isn't cool. You know what's cool? A billion startups.
jon_dahl··on 1000Memories in 60 seconds (video, YC S10)
Did you do the production in-house, or hire someone? Definitely well done, and a good tone.
jon_dahl··on Paul Buchheit: Angel investing, my first three years
Yes, but his real position isn't 10%. It's 10% plus a stake in Weebly, Wufoo, and a dozen other companies that are still alive. Discounting those to $0 isn't exactly accurate.
jon_dahl··on Web video stats: December 2010
Honestly, I think the main reason is inertia. Some of our customers started using VP6 back in 2007-2008, and don't want to simultaneously support two codecs. They generally want to switch down the road, but it will take a bit of work to re-encode their backlog.

Licensing is the other issue: VP6 is royalty-free, while H.264 isn't.

jon_dahl··on Realtime encoding - over 150x faster
This is often true, but not always - some video formats put header data at the end of the file, not the beginning, so you can't just start encoding as bits come in. Or if you can, you're encoding blind.
jon_dahl··on Realtime encoding - over 150x faster
IANAL, but generally, you need a license if you're using open-source encoders or decoders and you're the one who actually compiles them. (Again, not a lawyer, but that changes ffmpeg from "a source code description of an encoder" to "an encoder.")

MPEG video stuff is generally pretty cheap or free for low volume. Audio codecs are fairly expensive, on the other hand. AAC + MP3 + AMR is >$20K in minimum fees.

jon_dahl··on Cloudkick + Zencoder deal for $17 on AppSumo
Nope. Use it as long as your Zencoder account is active.
jon_dahl··on Why we’re really happy with AppEngine (and not going anywhere else)
Thanks! And great writeup by Matt. You should do a blog post on your video workflow - GAE and a transcoding API like Zencoder. :)
jon_dahl··on Google Offered To Buy Twitter For $2.5-$4 Billion
Twitter is a network that is used by 150 million people. It is embedded deeply into thousands of software systems. Millions of people consider it an important part of daily life - maybe more important than things like newspaper and cable TV. Every day, Twitter publishes (and collects) something like 50m tweets, and their database contains maybe the best record of what's happened in the digital world in the last few years.

That's unique.

jon_dahl··on Why Zencoder is ideal for a video web app
This is a fair question, and I have two answers.

1. Even if we were just using ffmpeg + simple scripts, we think there is value to using a service instead of our customers running video encoding on their own. We offer easy integration, automatic scalability, a well-designed API, and customer support. So theoretically Amazon S3 is just a file server, but it's still worth using S3. In other words, even simple technology has some benefits when packaged as a service as opposed to managing the technology yourself.

2. Beyond that, we're much more than just ffmpeg. ffmpeg is awesome, and we use ffmpeg as maybe 25%-30% of the work in our encoding chain. But video technology is really messy. There are hundreds of edge cases and non-standard files/formats/settings. The best tools take you 95% of the way there, but the remaining 5% is exceptionally painful, and a few tools plus (simple) scripts don't get you to 99%, let alone 100%. That takes thousands of hours of work, and it really makes sense to let a service handle that, instead of thousands of companies doing that work themselves.

Does that make sense?

jon_dahl··on Why Zencoder is ideal for a video web app
Thanks for the feedback, Kevin! If you don't mind sharing, what's your impression of Zencoder based on our homepage? What would better explain what we do to you?
jon_dahl··on Why Zencoder is ideal for a video web app
Thanks for the writeup, Steve!

Takeoff is really well done. The UI is beautiful and really intuitive. Congrats on a great service!

jon_dahl··on Zencoder joins the Heroku Add-on catalog
My concern is, Heroku makes add-ons almost too easy, and in my opinion, it may become [for me] a form of vendor lock-in. ... how easy is it to migrate your application and attached add-ons from Heroku once you have installed / integrated through their platform?

Not that hard. Zencoder uses the same API whether you're a Heroku customer or not, and I expect that is true of most add-ons that are third-party services.

jon_dahl··on Offer HN: Help understanding online video
Got it! I'll respond soon.
jon_dahl··on Offer HN: Help understanding online video
Hi!

There is no one "best" setting, unfortunately. Here are some guidelines, though.

-- You have two real codec options in FLV: VP6 and H.264. H.264 compresses significantly better than VP6.

-- Bitrate and lossiness are directly linked. Increase bitrate and visual quality will go up (within limits, of course), and vice versa.

-- When using H.264, use Baseline profile if you're concerned about choppy video on slow computers. Main and High profiles compress better, but require more CPU to decode.

-- Use one of two encoding modes: 2-pass Variable Bitrate (VBR), or one-pass Constant Quality (e.g. CRF). One-pass VBR doesn't look good.

-- CRF mode (for x264) is great. It targets a fixed visual quality/loss, and the bitrate adjusts to match that. Think of it as an "auto-bitrate" feature.

This is a really general starting point. Any more specific questions I can answer?

jon_dahl··on Ask HN: Independant Consulting
most Ror jobs pay way less.

Wide variability here, though. I've never had trouble finding Rails gigs around $125/hour, and have done some at higher rates.

(Edited for typo.)

jon_dahl··on UberCab Ordered to Cease And Desist
I think it's four or five steps up from the rogue drivers at NYC airports. The drivers are licensed limo drivers, and everything is official/on-the-books.
jon_dahl··on J.K. Rowling’s Plot Spreadsheets
That's kind of what King suggests. He recommends starting with life-like characters and an interesting setting, and seeing where the story takes you.

The result is that some of his characters and settings are more interesting than his plots. Example: later Dark Tower series.

jon_dahl··on Why services should offer marginal features (with apologies to 37signals)
OP here. I probably shouldn't have made my argument sound quite so mathematically rigorous. :)

You're right that a well-designed UI can decrease the complexity of additional features. That said, I think it's usually true that additional features have a larger impact on the complexity of a UI than the complexity of an API. Not as a universal rule, but as a general guideline.

jon_dahl··on Ask HN: Save my dying Startup
This is the key phrase to me:

What does an aspiring entrepreneur do now knowing that his idea can still work but has no motivation to continue without short-term incentives?

Startups are 1% idea, 6% brilliant founders, and 93% tenacity[1]. Of course, you have to be tenacious in a smart way, which typically means iterating and knowing when to pivot. If you're not motivated to stick it out, then your best bet is probably to put the project on ice. Maybe you'll find the funding and motivation in a year or two. But unless you want to do that, you need to keep grinding it out.

The hard part about grinding it out is that you're out of money, and you outsourced your development. That puts you in a hard position. Can you take over lead development yourself, and work on it nights/weekends?

Beyond that, read some Steve Blank. Are you convinced that: (1) people really want your product, and (2) you've built a product that clicks really well with the market? If not, you need to do that before you do anything else. No point in marketing a product that doesn't click. If you've done that, then it's a matter of getting the word out.

[1] Citation needed.

jon_dahl··on CarWoo (YC S09) promises car buyers hassle-free quotes, raises $4.2M
Sort of. X% of the market is a terrible growth strategy, but it's a decent gut-check to size a market. The previous poster was complaining that this gut-check wasn't big enough. The problem with that is thinking that a company is stuck with today's business model forever. If that were true, Google would still be selling search appliances.
jon_dahl··on CarWoo (YC S09) promises car buyers hassle-free quotes, raises $4.2M
I wouldn't worry about that. If they control 10% (or even 5%) of all car purchases in the US, they're going to be well positioned to do a ton of other interesting things.
jon_dahl··on Chargify New Pricing
Agreed on the metered components. Chargify's metered billing system is not ready for primetime.

I love the idea of a subscription management services, but this is still a very young space, unfortunately.

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