html - How to force YouTube Lowest Quality via Embed URL Parameter [2016] -


this question (only similar q on s/o) answered in perplexing haywire in 2012: youtube force 480p embed link

it briefly covers using &vq=small load 240p, so:

<iframe src="//youtube.com/embed/fqrgas0sopu?rel=0&vq=small" width="560" height="315" frameborder="0" allowfullscreen></iframe>

it said in answers &rel=0 required @ time.

the problem: said if video isn't available in chosen quality, load default (usually 720p).

there other keywords, such &hd=0 , &fmt=### choose codec & quality.

it known changing iframe's width , height tell yt quality use.

question: first of all, parameter (or combination of) right?

more specific question: how tell youtube, in url, use lowest quality possible, regardless of connection speed, screen size, or other circumstance?

extra: url parameter 144p? proof: screenshot of youtube app

also, google dev's youtube url parameter reference, here

thanks input.

the parameter "&afmt=55" plays video "55 kilobytes per second" (very low quality).

sample:

https://www.youtube.com/watch?feature=player_embedded&v=qgawwofaxto&afmt=55


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