Salsify – A New Architecture for Real-time Internet Video

[jremmons]

Hi everyone! I am one of the authors of Salsify. Ask me anything!

[aidenn0]

A practical issue I've seen with high-bandwith non-TCP transports (including video over RTP) is how they behave in the presence of multiple other streams on the line; when bandwidth becomes limited often you get one winner and a bunch of loser streams. Does salsify address this at all?

[bassman9000]

How does this differ from SIP/SDP?

[adam_gyroscope]

This is great. I used to work on on both the traffic/network side of YT and the encoding side, and could see the value of this approach handled by distribution nodes at the edge of a network.

[drewm1980]

It's implemented in C++, so I guess the authors are referring to pure functional style. I suppose they take and return encoder state as function arguments, rather than hiding it in a class and mutating it.

[Scaevolus]

Yes.

> Salsify uses a purely functional video codec to achieve this. Our video codec is 100% conformant with the Google VP8 format, but has one major trick: the encode and decode functions are purely functional, with no side effects, and represent the inter-frame “state” of the decoder explicitly. This allows Salsify to make the encoder compress a frame relative to an arbitrary decoder state, allowing the application to safely skip frames on output from the encoder, not just on input.

[krn94]

interesting idea, this is a topic i'm well acquainted with. curious if the authors have any thoughts on how this would extend to multiple encoding sources behind the same network interface

[marnett]

At all related to Salsify the company? [1]

[1] https://www.salsify.com/

[sadjad]

Not at all, just a coincidence!

[bitrazor123]

We don;t have enough CATs . We need to make them breed fast for unique contents

[quantized1]

Will crypto-kitties work?