[Solved] Video don't plays smoothly, while Isadora shows more then 50FPS.
I have same kind of issues with a MBP 15' Retine 2,2 GHz Intel Core i7, 16 Go 1600 MHz DDR3, Intel Iris Pro 1536 Mo.
Stage 1 : 1280x720 via HDMI out and Stage 2: 1024x768 via minidisplay port. No effects, isadora prefs 1280x720 / 25fps.
Movies are : 1280x720 / 25fps - Apple ProResLT.
Sometimes I send a movie to Stage 1 only, and there are lots of random mini-lags, sometimes less, while Isadora status is solid 25fps.
Sometimes I send a single movie to both Stages, same behaviour, sometimes noticeable lags, sometimes less.
Movies are playing fine in QT and VLC
Forcing Isadora to 50fps seems to settle a little bit things, but not completely.
Do you think it's a video card related problem (VRam) ? (I think maybe I should stop use laptops for video..!)
Any advice ?
Mikhail last edited by
After testing 3 deferent cards (old gf 8500/2GB VRAM, gf 730/2gb VRAM and gf 1070/16GB VRAM), also on my laptop(gf 750M/2gb VRam), my thought is VRAM - main issue of dropping frames(while isadora shows normal fps) when playing several videos simultaneously(or playing video on several stages). I suppose this is main reason in this case. Try to use "proccess explorer"(small tool for analyse PC-processes ) to determine GPU-usage, when this lags appears. Also, this tool helps you to determine HDD activity(speed of reading) to know if hdd transfer speed achieve maximum. In my case all cards with 2Gb VRAM shows me 80% of GPU using, when this lags happened. Hdd speed was not too much(less then 10mb/sec). Which video card and how many VRAM installed on your laptop? And please note, this is only my thought.
The video card is an Intel Iris Pro 5200 with shared VRam (Max 1,5Go) (as everymac.com says :http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-2.2-15-iris-only-mid-2015-retina-display-specs.html)
Can we say that to avoid lag, we must avoid videocards with shared VRam ?
@ fifou I would suggest having a dedicated video card for any media playback system. Unfortunately apple have really dropped the ball on this and only the most expensive machines now have these (I see a lot of cheaper end PC laptops with 2 and 4 gig cards - from $800, but the first apple machine with a real and pretty low spec GFX card is $2,400). I think it can be a hardware guide for Isadora, but I can see a lot of complaints of why cant my $2000 apple laptop play back these files....reason is obvious but users are unhappy as they paid too much for the laptop).
Same behaviour with my 2012 MBP - 2,6 GHz Intel Core i7- 16 Go 1600 MHz DDR3 - NVIDIA GeForce GT 650M 1024 Mo VRam - 2 SSD Drives.
Reading one single 1280x720 movie @ 25fps (Apple ProRes LT) on a single 1024x768 Projector (simple mapping with one quad rectangle).
Sometimes lags occurs at the entrance of the scene, sometimes lags appear after 10-30 secs playing (and not at the begining) and then dissapear..
I don't understand why my computer isn't able to archieve this correctly..
@fifou can you try hap?
Not for now (rehearsals), but I will..
I've tried HAP.
Players are switching to QT but the overall result is better (not perfect), 95Mbps for a single 720p movie..
There must be better solutions for reading a single movie without a single lag.
I wish I could find the culprit..
@fifou, I am not sure how to help you further, I could get smooth playback of HD from my old core 2 Duo machine with a 512 mb GFX card with Isadora and with my retina with 2 gig nvidia GFX I get 4x full HD or 4k smooth. Is there anything else running on your system using resources?
What frame rate do you use for the videos? I often had this issue in Isadora as well as in other live mixing software. Even playing them on big media server's like watchout or Pandora's. What most times seem to help is, rendering the content with at least 50/s.BestDelil
@ DillTheKraut use 1.5g data rates as I have only had 1.5 infrastructure mostly so that means 25p or 50i. I have been doing much more 50p lately. I am definitely not a fan of pandora and it does not have a great reputation for playback. A lot of the time I have written my own software for playback and have not had problems either....not that this helps you, just to say that the hardware is sufficient.I get good 4k playback with hap except for its poor colour banding on gradients, this is inherent in the hap codec.Pro-res LT is often my go to codec at 1080p25 it works just great. I think a lot of others have a similar experience with Izzy, especially since version 2\. Sometimes I will put Izzy to a target of 50 fps for the 25fps playback and it gets smoother (if I have had problems).Maybe you can send me a sample and patch and I can test it on other hardware?Fred
@Thank you for offering help. It's not an actual issue, but something me and others experienced allot. Pandoras is only one example, given Millumin, resolume, etc.My experiences are based on a Mac Pro 2013 with 48GB and two firepro300.What I didn't try yet, is enabling/ disabling vsync. Curious if this option is available on OSX anyways.BestDelil
No, cpu activity is very low when playing movie (almost nothing on the 8 cores).
Movies are on the internal SSD.
Movies are 25fps, Isadora target framerate is 50fps (It works better this way) and stays @ 50fps during playback.
I'm talking about micro freezes in the movements, sometimes. never at the same time.
Hmmm, I have definatley seen not so great performance but I dont know if I noticed the same things as you have seen. What are you using to convert your files?
I would look at your backround services, perhaps you have some utility that is interrupting to manage some aspect of your system. Even a virus scanner may cause intermittent interrupts. Also, be sure you are playing at a framerate that matches your hardware.
Guys, I think I found the culprit.
Videofiles supposed to be native ProResLT 1280 x 720 files, were 12.. x 7.. real size (some fancy resolution,I don't remember replaced files) and 1280 x 720 display size. I don't know how I managed to do such things when I exported my medias (shame on me).
So it seems that when movies aren't the same resolution as Isadora's default, rendering is much less efficient (AVFoundation).
Now, it's almost perfect !
Thanks all for your answers and advices.