As I mentioned, the sound is of course out of sync and I'd use an audio skew correction to fix it. Seems fine outside of the strange sound speed changes. FPS usually can't change along the way of the video, unless it is VFR (variable frame rate), but that's complicated. AVIsynth has a function assumefps(18) which when used in. The framerate actually doesn't match, because by AssumeFPS(14) you're changing FPS of b to 14 and try to concatenate that with two 10 FPS fragments. The filter attempts to convert the frame rate of clip to newrate without dropping or inserting frames, providing a smooth conversion with results similar to those of hardware converters. Last edited by johnmeyer 5th Jan 2017 at 17:13. I have a 50fps progressive scan file that I need to playback at 18fps - no dropped frames. Synopsis ConvertFPS( newrate, zone nlines, vbi nlines, clip ) Description ConvertFPS() is a video filter for the Avisynth video frameserver. Fortunately, it is easy to fix field reversal, if it is already baked in, but you can't (usually) just simply change the field order flag. The fact it's not in sync isn't that much of an issue and I can fix it with an audio skew correction, so ignore that at the moment.ДЄs you can see, the framerate & also sound is slower than it needs to be.Д®ncoded w/ my own avisynth lines The usual culprit is the SelectEvery () statement, although there are other ways to cause the problem.

This one is the original with crop and resize: Code: AVISource ('D:weddingtdk vhsc. The only problem would occur in the 1 frame sections, which I am not sure if ConvertFPS will properly handle them by themselves. I did it a few years ago however now I did search by google: vhs restore avisynth to see any improvement since I did last. I dont know if this means theres something about the interaction of things from Neo with the NEWAVSVALUE arrays that 64-bit GCC or MinGW-w64 doesnt like, or if its just masking. using AssumeFPS when importing each clip to ensure that the frame rates match. Instead of trimming out the odd frames you could instead Trim them together (as it would do in a v2->v1 conversion) and run AssumeFPS(theirfps).ConvertFPS(targetfps). Playing around a little bit, if I disable NEWAVSVALUE, the function list gets farther along before segfaulting - AssumeFPS is reached before it bails out. But then, the sound ends up messed up at certain parts. so AviSynth will know exactly where your new clip will begin and end. I'm not 100% new to AviSynth, as I've used it for recording other things before, so I used a few lines in AviSynth to fix this issue as I usually do. Of course, if this doesn't work, you might have other more severe audio problems, but this works in a majority of cases.Thread title: Sooo I'm using VirtualDub to record, and that's all fine and dandy except the framerate and sound are both pretty messed up. Then, making sure that both audio and video are set to 'direct stream copy,' you can save a new AVI that has a fixed frame rate, keeping the video and audio in sync. If you're not using AviSynth, you can still fix this fairly easily using VirtualDub: go to Video, Frame Rate (or just press Ctrl-R), and choose 'Change so video and audio durations match.' Unfortunately that tends to create videos with really weird framerates that other programs might not like, so I'd recommend changing the FPS to something standard after doing that: Video = video.AssumeFPS(video.FrameCount() / (video.AudioLengthF() / video.AudioRate())) If you're using AviSynth, this is a fairly simple fix:

If you're lucky, the fix is simple: keep the audio as-is, and adjust the video to match the audio's length. That (using prefetch) will not work (with the current implementations), period. You've loaded up your video into your editor of choice - but, horrors of horrors, you've noticed that the audio doesn't quite keep in sync with the video! As the video goes on, it gets more and more out of sync. As already said by realfinder and in doom9 using prefetch in the above script means that you're practically trying to use prefetch on source filter (AssumeFPS doesn't get frames).

Avisynth assumefps