Guru Session #13: Body Tracking with Depth Cameras (Fri May 8th, 6pm CEST/5pm GMT/12pm EDT/9am PDT)


  • @nandada said:

    The alpha channel is transparent in AfterEffects but black in Isadora no matter how I change the settings in the movie player.

    Can you export one or two seconds of the movie and get it to me so I can examine it? The upload limit here is 4MB so the movie cannot be bigger than that. (You'll have to .zip it anyway before you upload.)

    Best Wishes,
    Mark



  • @nandada

    You said:

    "The alpha channel is transparent in AfterEffects but black in Isadora no matter how I change the settings in the movie player."

    But the movie you uploaded is an uncompressed 10 YUV Movie -- which I found out by hovering over the movie in Isadora. My friend opened your clip in After Effects and it also said that there was no alpha channel.

    You must export the movie with a codec that actually supports an alpha channel, e.g., Apple Pro Res 4444 or HapA. 

    Best Wishes,
    Mark


  • Thanks Mark, I'm puzzled-the Alpha channel showed up on my end at least in AE. I've been using an older version of Premiere which doesn't have those codecs but I will try on my other computer which has Creative Cloud on it. Thank you for taking the time for this.


  • @nandada I'm not sure how it is possible that you see an Alpha in After Effects. Does it also show up if you import the file you posted, right click on it and choose "Interpret Footage"? 

    As far as I know, Uncompresssed 10-bit codec didn't support RBG+, also in the older versions of After Effects/Premiere, which means you can either get a video with only the Alpha or only the RGB channels. If you want to do that, you'll have to add in the Alpha Channel in Izzy with the "Add Alpha Channel" actor. The codec you should have is "Animation", but it will possibly produce a very large file - make sure to check "RGB+Alpha" on export. Same with the codec set to none "None(Uncompressed RGB 8-bit).. However, if you have the possibility to use ProRes or Hap, I would recommend using one of the codecs Mark suggested above.


  • @enibee THANKS SO MUCH!!! This answers the question. I had tried animation and picked RGB + alpha but didn't know to use add alpha channel . It's a hassle to go back and forth between my Mac show machines and my PC editing rig but I will see if HAP is a possibility on my new Premiere


  • @nandada said:

    I will see if HAP is a possibility on my new Premiere

     If Isadora is installed on your PC (even the demo) it will install HAP codecs. They should appear in Premiere. Thanks @enibee for sharing your expertise. ;-)

    Best Wishes,
    Mark


  • @mark They show up in Isadora but not in Premiere. I'll try to figure out how to get them going in Premiere. 

  • Beta Platinum

    Hi there, 

    The .oni file allows you to record the movement of the OpenNI trackers inside Isadora. That way you don't have to a dancer running around the entire time. You just press record, let the dancer / person do his thing and press record again. When you enter the filename inside Isadora you can then recall that movement and keep patching.


    [STAFF NOTE: This is in response to the comment below, which was originally its own thread but has been moved here]

  • Tech Staff

    @kdmatos said:

    Hello everybody.

    First of all thank you very much Mark for your excellent work. Your pedagogical qualities are also freat.

    I have a question, in relation the guru 13 session:

    at one point you use on the actor an .oni file in the first example, i.e. the video film dealing with the cathedral. How did you convert the movie into an .oni file? Why doing so?

    Thanks in advance, Jean-Marc Matos


    [STAFF NOTE: @kdmatos I moved your question and @Juriaan 's response to this thread so that all the discussion could be kept in one place.]