subogero linux blog

To cut a long story short: YouTube finally works in HD on my TV with RemotePi. I can’t stop watching LaFerrari and McLaren P1 videos in HD with great sound!

Why was it so difficult?

In the old times, youtube-dl -g spat out YouTube stream URLs, and omxplayer could play them straight away. The excellent ncurses based yt worked this way. But things have changed. YouTube now only streams the video if a session cookie is presented. But omxplayer can’t use cookie jars.

But curl can! We tell youtube-dl to save the cookie, and let curl save/stream the video using the cookie.

curl -b jar `youtube-dl -g --cookies jar --write-thumbnail`

will spit out the video stream.

1st Attempt – Save to File

Let curl save to a file, and start omxplayer a few seconds later to play it back. Keep fingers crossed that curl saves faster than omxplayer reads.

It does not. This solution is so disk/sdcard IO intensive, that omxplayer will reach the EOF too soon and exit.

2nd Attempt – Stream via FIFO

Let’s create a FIFO file, and let curl write the video stream into that. And start omxplayer immediately to read the video stream from the FIFO. It works beautifully:

• there is no disk IO at all, so curl writes faster than omxplayer reads
• even if it’s not the case due to a slow network, the player does not exit, just blocks until curl catches up. Bacause the FIFO is a character device!
• if omxplayer exits for any reason, curl gets a SIGPIPE and exits too

The Result – rpyt

It’s all wrapped up in a new script packaged with omxd: rpyt.

And the RemotePi remote-control web-app also uses that from now. See the project homepage and the code on Github.

YouTube parties have a few flaws. Five to ten people gather around a small laptop, an even smaller tablet or a tiny smartphone. Nobody can see the screen really well. It’s no biggie, actually, as nobody cares for videos someone else wants to show. You only want to show off yours. And here is the problem:

You have to wait until the end of that lame boring clip, just to start the search for that brilliant masterpiece you’ve come across last night.

And that’s where remotepi and youtube-dl come for the help of the party, to fix the small problem and the big problem. First, the actual video is played on your huge flatscreen TV by the Raspberry Pi. Second, everyone can search for the next clip on their mobile phones in the meantime!

Head to the homepage or github.com/subogero/remotepi to solve your YouTube problems.

And why semi-ultimate? Erm, a few small problems. The omxd playlist daemon may or may not work properly with the freshest omxplayer. Also, a few video URLs can’t be played by the latter, probably due to authentication problems. But give it a try, anyway.