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Movie Playback optimization

General discussion about anything TouchDesigner

Movie Playback optimization

Postby hrtlacek » Wed Jul 11, 2018 6:43 am

Hi guys,
For an installation I need to playback 23 videos @120 fps. I need to be able to dynamically change playback speed and I need to be able to play them backwards. At the moment I have a pretty slow ssd, so I run into problems. All videos are encoded in hap using adobe media encoder, i tested encoding in ffmpeg using its chunks option but i didn't see much improvement.
My real question is: The [url]wiki page, https://docs.derivative.ca/index.php?title=Hap[/url] on hap tells me how to calculate the bitrate i need for smooth hap playback.
In my case this would be 23 videos * resolutionX * resolutionY * 120 fps. Alright, so I can calculate what SSD will work with which resolution. But it seems playing the videos backwards needs a lot more SSD speed. How do I calculate what speed I need for backwards playing? How can I optimize this system for backwards playing?
Thanks a lot!
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Re: Movie Playback optimization

Postby nettoyeur » Wed Jul 11, 2018 7:05 am

I'll just place the link to an older answer I wrote about backwards movie playback, as the info is still valid afaik:

viewtopic.php?f=27&t=11087&p=42876&hilit=backwards#p42831
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