AWS Thinkbox Discussion Forums

h264 playback abysmal

It appears that the quicktimes being created by draft aren’t getting hardware accellerated or are extremely out of spec. As a result quicktime on windows plays them back at about 1fps. Even slower than if I intentionally sabotage a Quicktime by changing the Alpha blend options in a normal quicktime.

Is there a set of settings for H264 (specific bitrate perhaps) which allow a 1080p to playback in Quicktime Player properly on windows?

Thank you for your report! We will look into this. What settings are you using now (bitrate, etc.)?

videoEncoder = Draft.VideoEncoder( “C:\Users\ggreenwalt\Desktop\EWD_GTG-0030_B04.01.mov”, 24.0, 1920, 1080, 20000, “H264” )

What’s interesting though is that if I go to the file properties (right click) it reports the bitrate as 45,646kbps more than twice the bitrate. Inside Quicktime Pro it says “38.44mbps”. So it seems as if that value isn’t doing what it’s supposed to. It’s 57 frames long and 10MB so 20 * 20kbps = 4.7MB not 10MB.

25mbps is what the max-quality QTPro exporter creates.
EWD_GTG-0030_B04.01_h264.mov (4.64 MB)
QuickH264.zip (737 Bytes)

By comparison here is a QTPro QT.

Perfect, thanks!

Ok, I’ve got it all setup now so that when you render something out of Nuke it auto-increments the nuke file, creates a new folder and updates the render directory and spits out an h264 viewable. Just need to have it upload to shotgun and create a version and it’s all peachy. So as soon as you can figure out what’s causing the performance issues I’ll be golden!

Any progress on this front?

In my testing build this is improved but still worse than the movie you produced using QuickTime Pro. I’m planning to look into this further.

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