I'm trying to use the Reverse function on AVISynth, but whenever I do it, the video becomes very slow and the CPU power goes up.
Code:AudioDub(FFVideoSource("test.wmv", fpsnum = 30000, fpsden = 1001), FFAudioSource("test.wmv")) Trim(6063,7047) Reverse
Is the Reverse function really that demanding or is there a way to make it run smoothly?
Try StreamFab Downloader and download from Netflix, Amazon, Youtube! Or Try DVDFab and copy Blu-rays! or rip iTunes movies!
+ Reply to Thread
Results 1 to 8 of 8
Thread
-
-
-
I've never used it but I gave it a test and couldn't get it to always run smoothly. For DVD video it seemd to run at the correct speed in reverse, but when I tried an Xvid encoded video..... not so much. The speed would increase and decrease, but I don't know if it's a decoding issue or whether for video that requires more CPU power to decode it's just going to be inconstant speed-wise. I tried ffms2 and L-Smash.
For me (I only tested a low resolution standard definition Xvid video, aside from a vob file) CPU usage did increase, but it was still only sitting on 30% or so and none of the individual CPU cores hit 100% (or even close), yet the video wasn't playing smoothly in reverse. Sorry, I don't know why.
I assume from the question you must know what level of hardware is required, so why keep us in suspense? -
Lossy codecs may give slow access (preceding frames to key frame need to be decoded before last one will be accessible) - prerender file to temporary and seek over it faster.
-
Long GOPs (not necessarily lossy codecs) require a lot of work for random (or backward) seeks -- which is required by the Reverse() function.
-
-
Similar Threads
-
How to reverse 3D full frame?
By tommy2010 in forum Video ConversionReplies: 40Last Post: 28th Dec 2023, 15:32 -
avisynth slow to load using FFVideoSource(....) than Virtualdub
By marcorocchini in forum Newbie / General discussionsReplies: 15Last Post: 23rd Sep 2014, 16:48 -
Avisynth How to prevent slow encode due to twice mentioning of Re-interlace
By VideoFanatic in forum RestorationReplies: 24Last Post: 25th Mar 2014, 10:59 -
Avisynth MDegrain very slow
By Dominik2000 in forum Video ConversionReplies: 0Last Post: 4th Feb 2013, 05:24 -
Avisynth - Stack 4 Videos But Too Slow - Help!
By controlalt in forum EditingReplies: 10Last Post: 14th Mar 2011, 08:36