garageCube

[cptnj91]

I am using MadMapper v5.3.2 with an educational license. I am trying to map somewhere around 80 videos but MadMapper (and my PC) becomes incredibly sluggish around the 16 video mark, and is rendered unusable by 23 videos. You can see from the attached photo that every core of my CPU is completely maxed out from the project. I even turned on the "Use Hardware Acceleration if possible" button and it provided no relief to the CPU usage, though it did cause my GPU usage to climb a bit.

My PC is running the following:
Microsoft Windows 10 Home
Intel i7-7700 CPU
NVIDIA GeForce GTX 1070
16 GB Ram

Each of the videos has the following characteristics:
0:36 Seconds
MP4
H.264
25 FPS
1920x1080 or 1080x1080
Less than 35Mb file size

I did some troubleshooting. For my testing I kept 8 unique videos displayed on the right side of the project, which held my CPU usage at about 40-47%. Here's what I discovered:

1) It's not simply an issue of two many videos running at once. I created 40 quads from the same movie file (which brought the total videos on screen to 48) and the project continued to work without any impact to the CPU.
2) It's not an issue with total video length. I created a 9 minute video by splicing together many of the individual videos and when I imported that and dropped it on screen (bringing the total videos on screen to 9) it had a negligible impact on CPU usage.

It seems to me that this is an issue with MadMapper not being able to handle more than a certain amount of unique video files. What's even more odd to me is that I did a similar project in the past and was able to project around 30 videos (some videos over an hour in length) on my laptop with slower hardware than my PC.

Any insight or suggestions would be valuable. Thank you.

[mad-matt]

Hi!

It seems to me that this is an issue with MadMapper not being able to handle more than a certain amount of unique video files.

It's not MadMapper related. It's your CPU. Decompressing a single movie and showing it on 2000 surfaces is not really a problem, the GPU is very good at displaying a texture over millions of triangles.
You should re-encode your movies to HAP codec. The limit with HAP might be your hard drive bandwidth, use a fast SSD drive with the right connection if you want to player many files. With HAP, the CPU does not much (fast unzipping of each frame), the frames are transmitted to the GPU in a compressed format.

What's even more odd to me is that I did a similar project in the past and was able to project around 30 videos (some videos over an hour in length) on my laptop with slower hardware than my PC.

Same movie resolution ? Same video codec ? Same bitrate ?
Even with H264, the encoding bandwidth has influence. You can play a hundred H264 movies in 320x240 pixels movie with low bitrate, but maybe just one 8k in good quality.
To what I know there's no regression in video playback