Fixing dropped frames in action cam footage? (for stereoscopic 3D) (Page 2 of 8)

Interesting!   (also, more programs and utilities I've never heard of!). Um, that frame count difference is caused by the dropped frames, right?

I used a wireless remote control to start and stop both cameras simultaneously. They won't start or stop *exactly* at the same time, but at least 'close enough' so that the sync can be done manually in Vegas. Usually they're only 1-2 frames off from each other.

It's worked well so far, but those dropped frames are a big problem, as even if the videos are in sync in the beginning, they will end up drifting off sync towards the end as the frame drops wreak havoc...

Um... now I fell off the tracks. N00b not understand what this mean. Do you mean the framerate is consistent after all?

Looks like you came to the right place Skaven...   

Skaven252
when AviSynth does the "convertfps", will it correct the drops by duplicating frames so that the hard drop doesn't throw the clips off sync?
Yes. In your case it will be added no one duplicate frames to the first clip and only one to the second clip.

Try to open MOVs by DirectShowSource. If it works then it is nice (on my system it can't open MOVs, I don't know why.., I'm searching ).
Otherwise point in QTSource right framerate (29.95). And with only one hard-drop you can forget about sync issue

Skaven252
Um, "pointing the framerate", I presume, doesn't do the same as AssumeFPS?
No. It is different things. If you open video with wrong FPS you will lose original frames or will get unwanted duplicates. For example opening 30 fps video with framerate 1 frame/sec will lead to losing 29 frames each second. And AssumeFPS in this case can't help absolutely.

Great, thanks for checking this for me! I was just googling for the QTInput wiki a while ago, when a notification of this reply appeared.

I remember having some other difficulties with other modes than mode=3 (AviSynth crash? I don't remember) that's why I was using it.

Skaven252
rebuilds the header data
Are you sure this operation is correct. Results still have synchro?

Can you share source to me?
Second file with one drop will be enough.

Skaven252
Original file showed the same statistics as previous MOV: mkv-vfr and mp4-dump are identical in part with timeCodes.
It is mean your processing between MOVs is correct

Wow, how did you generate that report? Just Excellence? That's a lot of work again, many thanks!

I ran into an odd issue with QTSource... if I use "mode=0", it halves the resolution of the video to 960x540.  This happens both in VirtualDub or if I open the .avs in any media player.  Only with "mode=3" I get full resolution.

With DirectShowSource, when opening the .avs, VirtualDub just freezes and refuses to open the video. I wonder if I need to install some codec or such to get .movs to work through DirectShow...

My camera can also record straight into mp4 container. I wonder what the difference between its .mp4 and .mov files is.

Again, I remember I had some difficulties with .mp4 so I switched to .mov - but I can't remember what those difficulties were...    ...likely it was the "AviSynth stopping at 75% through the video" issue. And I had to switch to .mov because QuickTime couldn't re-save (to rebuild header data) the .mp4 files.

I'll have to try make some test recordings into .mp4 next weekend ( = more free time to play around with video files, this is slow stuff ).

I've found and installed the current SVP and AVISynth for SVP.  And here is (what I believe is) the current DoubleDropFix (v3) with my own file referenced:

DSS2("D:\Video-Work\2014-NCAA-wv\2014-11-14.wv.KY-v-MS.lag.ac3-320.avi").ConvertToYV12()
sc = msup (for = 1)
vf = MAnalyse (sc, ISB = false)
vb=MAnalyse(sc,isb=true)
global frame_50 = MFlowInter(sc,vb,vf,time=50).SubTitle("Fix-50", size=12, align=3)
global frame_33 = MFlowInter(sc,vb,vf,time=33).SubTitle("Fix-33", size=12, align=3).trim(1,0)
global frame_66 = MFlowInter(sc,vb,vf,time=66).SubTitle("Fix-66", size=12, align=3)
global frame_src = last
global mini=sc.crop(8,height+8*3,width/2,height/2).TemporalSoften(1, 1, 0, scenechange=1, mode=2)
mini.mt_lut global luma_drop = (y = -1, you = 128, v = 128)
drop_clip = mini.scriptclip ("mini.ydifferencefromprevious dif = ()
\ dif_next1=mini.trim(1,0).ydifferencefromprevious()
\ dif_prev1=(mini.trim(1,1)+mini).ydifferencefromprevious()
\ dif_nextMax=max(max(dif,dif_next1)/8,0.01)
\ Dif_prevMax = max (max (dif, dif_prev1) /8,0.01)
\ Dif> min (dif_prevMax, dif_nextMax)? Short: luma_drop
')
scriptclip ("
\ Fix_prev2=(drop_clip.trim(1,2)+drop_clip).AverageLuma
\ Fix_prev1=(drop_clip.trim(1,1)+drop_clip).AverageLuma
\ Fix=drop_clip.AverageLuma
\ Fix_next1=drop_clip.trim(1,0).AverageLuma
\ Fix_next2=drop_clip.trim(2,0).AverageLuma
\ Fix!=1
\ ? frame_src
\ : Fix_next1!=1
\   ? Fix_prev1!=1
\     ? frame_50
\     : Fix_prev2!=1
\       ? frame_66
\       : frame_src
\   :  Fix_next2!=1
\     ? Fix_prev1!=1
\       ? frame_33
\       : frame_src
\     : frame_src")

It's bombing on the DSS2 statement.  (Virtualdub gives message, "Unable to open file ___ (my .avs script)".)  I've never used that, only having used avisource.  (And I haven't used AVISynth in a long time, either.)

I have these .dll files in the folder, C:\Program Files (x86)\AviSynth 2.5\plugins:

DirectShowSource.dll
libflowsse.dll
libflowgpu.dll
mvtools2.dll
svpflow1.dll
svpflow_cpu.dll
svpflow2.dll
svpflow_gpu.dll  (I can supply date stamps on these if necessary)

As they are in the plugins folder, they should be loaded.  Yet it seems to be acting like they're not.  What am I missing??

Thanks, Mag.  I'd never heard of DSS2, so I didn't realize it merely opens a file.  I replaced that line with this:

avisource("D:\Video-Work\2014-NCAA-wv\2014-11-14.wv.KY-v-MS.lag.ac3-320.avi").ConvertToYV12()

When I run it in a script by itself (that line being the only line), it works fine.  (I'm opening the .avs file as a video input file in VirtualDub.  But when I have it at the top of your entire script, the script still bombs.  The first few lines look like this:

avisource("D:\Video-Work\2014-NCAA-wv\2014-11-14.wv.KY-v-MS.lag.ac3-320.avi").ConvertToYV12()
sc = msup (for = 1)
vf = MAnalyse (sc, ISB = false)
vb=MAnalyse(sc,isb=true)
global frame_50 = MFlowInter(sc,vb,vf,time=50).SubTitle("Fix-50", size=12, align=3)
global frame_33 = MFlowInter(sc,vb,vf,time=33).SubTitle("Fix-33", size=12, align=3).trim(1,0)
.
.
.

It's still bombing (with VD's unhelpful message) and I know of no way to debug these scripts, esp. w/o knowing all the elements used.  (I realize VD shouldn't be blamed for the cryptic message, as it's only receiving frameserved output.)  Can you please look to see if you see some error in the rest of your script AS duplicated by me here?  I pasted it from your Russian thread into Notepad, then into here (and my own script).