Video is stuttering

[erikerik]

I am new to this forum and actually registered because I have quite a big problem. I have received some DV video from somebody who made this for me. The video is on CD and I have to copy the file to my PC and rename the extension from .DAT to .MPEG.

When I now play the video however, it appears to be half the format in for instance the Windows Media Player. I think this has something to do with deinterlacing from what I have read on the Internet. However, what is even more worse, is that the video material flows discontinuous?! It really stutters like hell?! I however can't use the video material at this moment. I already tried some deinterlacing stuff with VirtualDub but this doesn't make it better.

What is going wrong here?! Can I throw away all video material or is this problem solvable?

[Baldrick]

Instead of just copying and renaming the dat to mpg use vcdgear or isobuster and convert the .dat from the cd to a mpg. See https://www.videohelp.com/guides.php?guideid=95&howtoselect=4;14#95 . Just copying and renaming from a VCD can cause strange problems

And try play with something else than wmp like vlc or mpc.

[erikerik]

Nope... didn't solve the issue. I just converted a small piece of the video to WMV so that you can see what I mean. It is attached to this post. The video really flows in a stuttering manner. BTW I read in the .DAT file now with IsoBuster and converter a part of it with Premiere to WMV. Original format has the same stuttering.



sample.wmv

[drewzor]

Interesting vid... would like to see where thats going?

So.. if its .dat on cd its a vcd or svcd and I'm guessing that the cd plays fine on a dvd player. If it doesnt play smoothly on a dvd player the frame rate may have been changed to 15fps.

Alternativly a damaged mpeg decoder could cause this type of problem. Try installing ffdshow to help decode the video

[erikerik]

Installed ffd. Didn't help. Further the issue is on every PC I have. Both on my laptop + my pc. It seems to really originate from the person who made this. Video was shot in India, and I am using it in Europe. However I have received more often video material (in DV) which did not have problems. Strange thing is, that during certain parts of the video the images flows as it should. Only this occurs very sporadically. 95% of the time it is really as discontinuous as in the sample I have posted here. Is there any option still that I can get the video material okay? Any idea further of the source of this? Is the cause found at the video camera or any conversion that has been done on the PC. Unfortunately I do not have access to the original material so this is all I have.

[erikerik]

By the way. Didn't try the vid on a stand-alone DVD player. will try this tomorrow. My guess is that the problem there also exists.

[Scorpion King]

If the sample wmv file is a true representation of the original then I side with drewzor and say the framerate was once 15fps. Thats exactly what lowered framerate video looks like.

Very nice by the way. I too would like to see the rest of it.

Good luck.

[jagabo]

15 fps? More like 4 fps. It's a 25 fps video and each frame repeats 6 times.

[erikerik]

Okay then... but if it is movie material with a low fps, is there something I can do to make the material flow better? I understand that I can speed up the movie but then the movement will be too fast. Any solutions for this?

[drewzor]

Well if the frame rate IS low then each frame will have a greater amount of movement lost inbetween frames. For example if there was only three frames per second you would appear on one side of the room then in the middle then on the other side of the room if you were walking across. To fill in frames will not replace the lost movement inbetween, you could use winmorph which will look average and is way to time consuming for each frame. I'm sorry but if the original file is this way there is not much you can do to make it smoother

[jagabo]

I tried the AVISynth SuperSlowMotion filter to replace the duplicate frames with motion interpolated frames. The background motion was very smooth but the woman's arms morphed very oddly.

slow.avi

[erikerik]

Wow... Indeed a good improvement. Only the hands are not going correctly indeed. Are there any other filters that could cope with it? BTW where can I find this SuperSlowMotion filter of AviSynth? Are there any other filters that could get the same effect but then with the hands not being amputated

[erikerik]

By the way... I have been searching on the net a bit and found a library for Avisynth that is called MVtools. Can this be a solution? There is some class called MVFlowFPS2 that sound interesting. Anyone any experience with this one or do you advise to try something else?

[jagabo]

Yes, I used MVTools to create the slow motion version. There are commercial products that do the same. I don't know if they work better or worse.

#ASYNTHER DirectShowSource

function smoothfps(clip source, float fps) { 
fp=fps*100
backward_vec = source.MVAnalyse(isb = true, truemotion=true, pel=2, idx=1) 
# we use explicit idx for more fast processing 
forward_vec = source.MVAnalyse(isb = false, truemotion=true, pel=2, idx=1) 
cropped = source.crop(4,4,-4,-4) # by half of block size 8 
backward_vec2 = cropped.MVAnalyse(isb = true, truemotion=true, pel=2, idx=2) 
forward_vec2 = cropped.MVAnalyse(isb = false, truemotion=true, pel=2, idx=2) 
return source.MVFlowFps2(backward_vec,forward_vec,backward_vec2,forward_vec2,num=int(fp),den=100, idx=1,idx2=2) 
}

DirectShowSource("sample.wmv")
SelectEvery(6, 0)
smoothfps(150.00)