Daniel Lange's blog (Entries tagged as video)

Get Youtube Channel ID from username

nospam@example.com (Daniel Lange) — Wed, 01 Jun 2022 16:45:00 +0000

Youtube has a really nice RSS feature that is extremely well hidden.

If you postfix a Channel ID to

https://www.youtube.com/feeds/videos.xml?channel_id=<id goes here>

you get a really nice Atom 1.0 (~RSS) feed for your feedreader.

Unfortunately the Channel ID is hard to find while you are navigating Youtube with usernames in the URL.

E.g. https://www.youtube.com/c/TED is TED's channel, full of interesting and worth-to-watch content (and some assorted horse toppings, of course).

But you have to read a lot of ugly HTML / JSON in that page to find and combine

https://www.youtube.com/feeds/videos.xml?channel_id=UCAuUUnT6oDeKwE6v1NGQxug

which is the related RSS feed.

Jeff Keeling wrote a simple Youtube RSS Extractor that does well if you have a ../playlist?... or a .../channel/... URL but it will (currently) fail on user name channels or Youtube landing pages.

So how do we get the Channel ID for a Youtube user we are interested to follow?

Youtube has a great API but that is gated by API keys even for the most simple calls (that came only with v3 of the API but the previous version is depreciated since 2015)¹:

dl@laptop:~$ curl 'https://www.googleapis.com/youtube/v3/channels?part=contentDetails&forUsername=DebConfVideos'
{
"error": {
"code": 403,
"message": "The request is missing a valid API key.",
"errors": [
{
"message": "The request is missing a valid API key.",
"domain": "global",
"reason": "forbidden"
}
],
"status": "PERMISSION_DENIED"
}
}

Luckily we can throw the same (example) user name DebConfVideos at curl and grep:

dl@laptop:~$ curl -s "https://www.youtube.com/c/DebConfVideos/videos" | grep -Po '"channelId":".+?"'
"channelId":"UC7SbfAPZf8SMvAxp8t51qtQ"

So https://www.youtube.com/feeds/videos.xml?channel_id=UC7SbfAPZf8SMvAxp8t51qtQ is the RSS feed for DebConfVideos.

We can use individual Youtube video URLs as well. With the hack above, it'll work to find us the Chanel ID from a Youtube video URL:

Now, some user pages may have multiple valid RSS feeds because they contain multiple channels.

Remember the TED page from above? Well run:

dl@laptop:~$ curl -s "https://www.youtube.com/c/TED" | grep -Po '"channelId":".+?"' | cut -d \" -f 4 | while read -r YTID ; do echo -n "Youtube-ID: $YTID " ; curl -s "https://www.youtube.com/feeds/videos.xml?channel_id=$YTID" | grep -m 1 -P -o "(?<=<title>).+(?=</title>)" ; done

This will iterate through the Channel IDs found and show you the titles. That way you can assess which one you want to add to your feedreader.

You probably want the last Channel ID listed above, the non-selective "TED" one. And that's the one from the example above.

Update

02.06.2022: smpl wrote in and has the much better solution for the most frequent use cases:

You can also use get a feed directly with a username:
https://www.youtube.com/feeds/videos.xml?user=<username>

The one I use most is the one for playlists (if creators remember to
use them).

https://www.youtube.com/feeds/videos.xml?playlist_id=<playlist id>

For the common case you don't even need the channel ID that way. But it is also conveniently given in a <yt:channelId> tag (or the topmost <id> tag) within the Atom XML document.

Thanks, smpl!

Actually it is even more complicated as some channels, like our DebConfVideos example, will only get you an incomplete result, cf. this StackOverflow entry. I.e. the forUsername iterator may not even work and the "best practice" seems to be mucking around with the search call. ↩

No CCC Congress this year but rC3 online

nospam@example.com (Daniel Lange) — Mon, 28 Dec 2020 15:30:00 +0000

The virtual version of the annual CCC Congress is underway and feels like a huge playground. Things are bumpy but the participants are still having fun. Of course, we have IRC as a safe heaven. That always works.

The virtual world (which is the only thing the sold out tickets are needed for) is really fun. It feels like debugging a DOS game in the 80/90s. Not much works but it is engaging enough to keep poking at things.

The data formats are 2020 though, the main "lobby map" is a 3 MB json file:

{ "compressionlevel":-1,
 "editorsettings":
    {
     "export":
        {
         "format":"json",
         "target":"main.json"
        }
    },
 "height":80,
 "infinite":false,
 "layers":[
        {
         "data":[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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         "height":80,
         "id":2,
         "name":"start",
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...

People that hand-optimized RLEs to fit games on floppies cry a little.

The streams are free (as in public), so please check https://streaming.media.ccc.de/ and the schedule at https://fahrplan.events.ccc.de/rc3/2020/Fahrplan/ for some great content to watch live or add to your play list.

Update on Dieselgate emissions cheating, presentation at CCC Congress (33C3)

nospam@example.com (Daniel Lange) — Tue, 03 Jan 2017 12:15:00 +0000

During the 33C3 annual CCC Congress in Hamburg I gave a presentation on the developments in Dieselgate over 2016 and the VW strategy in Europe.

You can watch the video (40min) and/or browse the slides.

If you want to know why people laughed during Ijon's introduction of the talk ... click here. The video doesn't show this completely due to the camera being switched.

Dieselgate Emissions cheating presentation at CCC Congress (32C3)

nospam@example.com (Daniel Lange) — Sun, 10 Jan 2016 12:21:13 +0000

Jake Edge of LWN wrote an excellent article on the presentation Felix and me gave at the 32C3 annual CCC congress in Hamburg, Germany on December 27th, 2015.

If you have an hour to spare, you can watch the video and/or browse the slides.

Converting a DVD film (mpeg2) to DV

nospam@example.com (Daniel Lange) — Wed, 22 Oct 2008 23:30:00 +0000

There are a gazillion web pages telling you how to convert DV to MPEG2 for DVD use. But I got a DVD from a corporate event and needed to convert it to DV to be cut in kdenlive. So just the other way around. Try to find a web page about that direction (needle in haystack, anyone?).

Giving up on google, I tried unsuccessfully with the swiss army knife that comes to mind first (ffmeg).

While something like ffmpeg -i vts_01_1.vob -i vts_01_2.vob -i vts_01_3.vob -sameq -target dv ../Raum_Video.avi creates a nice .avi, even mplayer complains about it violating the dv and avi standards.

So back to digging around in tutorials and forums and trial and error with other tools. Finally I found Avidemux to be the tool of choice. It encapsulates ffmpeg and other tools nicely to make them produce the expected results. Set video to DV (lavc), Audio to WAV PCM and the container format to AVI and go grab a ~~coffee~~ meal. It creates a nice DV file that you can easily work with in your favorite video editor.