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MisterAdvent
Inspiring
January 13, 2025

Why is rendering AVI to MP4 so slow???

  • January 13, 2025
  • 2 replies
  • 276 views

I've upgraded the machine with SSDs that are capable of 10GB/sec. But I'm rendering SD DV SDI to SD DV MP4 at around 12KB/s - when it writes.  It's "chunking,"  little write bursts that corresspond to 3D activity on the nVidia GPU and CPU.  Nothing happens on the Intel GPU. 

 

Latest nVidia driver on a 2080ti.

 

This used to render quickly.  What has changed?

AME 25.2 build 74 Beta

 

2 replies

M
MisterAdventAuthor
Inspiring
January 13, 2025

So now I'm checking other settings.  It is speedy with the Vimeo 480p settings, either widescreen or 4:3. 

 

If I switch interlacing on, it does the slowdown.

 

Except with the "Match Source - Adaptive High Resolution" setting. With interlacing set to Progressive, it slows down (but not as much as with it on).

 

M
MisterAdventAuthor
Inspiring
January 13, 2025

I just ran an experiment and exported the DV AVI to a 720p MP4 (16:9 with pillarbox).  It went full tilt. What took 20 minutes in 4:3 was done in 2 minutes flat. 


So what happend to 4:3 support???

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