Live video and stuttering video playback helppp!!!!

  • Tech Staff

    I am pretty sure this a codec thing.

    But also: 
    What resolution is the live video coming in? If it's HD 1920*1080 then Isadora will be heavily processing mixing 1920*1080 into 1280*800 that a lot of pixels!
    (p.s - I deleted the other thread to avoid confusion)

  • try to avoid the 1080i 720p is really what you are looking for, no interlaced problems, a higher source framerate etc.

    and it doesn't make sense to capture with a ci actor transform it to a video stream and then back to a image stream
    texture and image streams are handled on the gpu, video streams are cpu based so the data travels far to often on the pci bus resulting in a reduced framerates
    try to use prores proxy as the codec it is highly multithreaded by the os
    hope this helps

  • The Isadora 2.0 release notes contain some important tips on this topic. Take a look.
    and get the latest version.

  • Thank you all a lot!!!
    I use the photo-jpg codec with isadora 1.3.0f24.
    @Skulpture: Yes it is a Full HD signal via HDMI, but i set the resolution to Half in the capture settings. Does that change anything? Or produce that heavily processing twice?
    What do you recomment. I just can capture full hd via hdmi out of that camera.
    I also think it could be a codec thing, because i experienced stuttering without video capture before. Which codec should i use for that resolution. i dont scroll/jump through the movie. Just playing, Stopping, Playing again.

    ahh and thanks for deleting the other thread

    @m_theatre: thanks, will try the prores proxy but i think i will get huge file sizes, right?
    Ok i will change the ci video in watcher to video in watcher!!!

    What about a preload video actor?

    Could anybody take a look in the patch i made. I think it could build more clever!
    I am little desperate. Next week it should work. Would even pay for it.
    Is there anybody near Magdeburg, Germany

    Thanks to all



  • ah and working with aMBP 2,8 GHz Itel Core i7 16GB, Graphiccard NVIDIA GeForce GT 750M

  • I'm getting very poor video playback in Isadora, particularly with ProResLT files, it's so poor that it's unusable ATM. The FPS counter is reading just under 50 fps but the video is very stuttery. I think it is a codec issue as HAP files I've tried don't exhibit the stuttering.

    I recreated the same multi-layer scene in VDMX and no such stuttering occurs which rules out HDD.
    As a quick test I created A HAP version of the same file and it plays back smoothly in Isadora, in fact, I dragged 6 versions of the file (@1080p) onto the canvas and there was no stutter at all apart from the very obvious stutter when the file is looped which isn't present with VDMX.
    BTW, love the ability to drag n drop and the integrated media window in B28.

  • @Unfenswinger
    Yes, its is very important that users in 2.0 read the support docs about codecs, before panicking! ;)
    I am having extremely good results myself on a MBP with SSD drive using HAP codec.

  • @oli
    Just realised you are working with Isadora 1.30f24 is an old version of Isadora and is not optimised for running HD video files in the same way that version 2.0 is.  I strongly recommend that you upgrade to using the latest version.

  • @primaldivine

    Not sure why ProRes should playback so poorly in Isadora? ProResLT has a nice file size/quality ratio which is why I've been using it and I've never encountered playback issues with anything else.
    PhotoJPEG is the best codec I've found that will loop without a stutter at the beginning which affects HAP files I've tested. So it's swing and roundabouts for your choice of codec in Isadora.

  • @primaldivine an all others:

    Thank you all a lot: do you recomment me to join the early adopter program, or should the pre-release version also  solve my problem ? i will try the hap codec as well.
    But correct me if am wrong, i red in the release notes, that i should set the ‘optimize’ input of the Movie Player to ‘performance’ with H264 codec. But could´t find it in the pre-release version. That means getting an early adopter ?
    Best Oli