Joining two vidoes with different FPS

[tacman1123]

I have two video clips, one from a DV Camera, one from a webcam. I'd like to splice them together. Below is the code with information about each of the clips.

# DV Videocamera (66 frames, 2.2s)
avi=DirectShowSource("c:\avi\frontdesk\432.472.avi")
# 720x480 66F@29.97fps = 2.20secs
# Audio (Rate:48000 Length:105706 Channels:2 Bits:16)
# +AudioInt +YUV +YUY2 +FrameBased +Interleaved
# -AudioFloat -Planar -RGB -RGB24 -RGB32 -YV12 -Planar -FieldBased

avi=H==avi.height ? avi : avi.Lanczos4Resize(W, H)
c1=avi.AssumeFPS(F).ConvertToYV12().ResampleAudio(R)


# Webcam (49 frames, 1.9s)
avi=DirectShowSource("c:\avi\frontdesk\p440_081023_174343_453.avi")
# 320x240 49F@25.26fps = 1.94secs
# Audio (Rate:44100 Length:77410 Channels:2 Bits:16)
# +AudioInt +RGB +RGB24 +FrameBased +Interleaved
# -AudioFloat -Planar -RGB32 -YUV -YUY2 -YV12 -Planar -FieldBased

avi=H==avi.height ? avi : avi.Lanczos4Resize(W, H)
c2=avi.ConvertFPS(F).ConvertToYV12().ResampleAudio(R)


c1+c2


The video plays, the resizing works (that is, the webcam video resizes to WxH, the same size as the dv), the audio sounds right (I took a stab at the resampling based on advice here), BUT the video frame rate isn't right -- the webcam video plays too fast, then repeats.

I've tried ChangeFPS(), ConvertFPS(), AssumeFPS(), but nothing seems to work. I suspect this is something simple, can anyone point me to what else I should try?

Thx,

Tac

[Guest]

Give the whole script. We can't see what F is.

[tacman1123]

Sorry, forgot that I have some globals defined in the plugins directory (these are from some scripts here, I think maybe MikeyMike's Ken Burns Effect examples):


# some globals

Global W = 720
Global H = 480
Global F = Framerate(AssumeFPS(BlankClip(),"ntsc_video"))
Global R = 48000
Global Resizer = "BlackmanResize"
Global Blank = BlankClip(1, W, H, pixel_type="YV12", fps=F, stereo=true, audio_rate=R).Loop(1)

[Guest]

Now I don't see some more missing variables, e.g., "ntsc_video".

Give the whole script in one piece!

[tacman1123]

"ntsc_video" is a pre-defined setting for the FPS routines:

http://avisynth.org/mediawiki/AssumeFPS

I used the preset rather than 29.97, because I believe it's more accurate and I'm trying to avoid the "FrameRates don't match" error.

I'm wondering if "Bob" and "Weave" come into play here, I see them in some sample scripts when doing conversion, but don't understand them.

Here's the full code


Global W = 720
Global H = 480
Global F = Framerate(AssumeFPS(BlankClip(),"ntsc_video"))
Global R = 48000

# DV Videocamera (66 frames, 2.2s)
avi=DirectShowSource("c:\avi\frontdesk\432.472.avi")
# 720x480 66F@29.97fps = 2.20secs
# Audio (Rate:48000 Length:105706 Channels:2 Bits:16)
# +AudioInt +YUV +YUY2 +FrameBased +Interleaved
# -AudioFloat -Planar -RGB -RGB24 -RGB32 -YV12 -Planar -FieldBased

avi=H==avi.height ? avi : avi.Lanczos4Resize(W, H)
c1=avi.AssumeFPS(F).ConvertToYV12().ResampleAudio(R)


# Webcam (49 frames, 1.9s)
avi=DirectShowSource("c:\avi\frontdesk\p440_081023_174343_453.avi")
# 320x240 49F@25.26fps = 1.94secs
# Audio (Rate:44100 Length:77410 Channels:2 Bits:16)
# +AudioInt +RGB +RGB24 +FrameBased +Interleaved
# -AudioFloat -Planar -RGB32 -YUV -YUY2 -YV12 -Planar -FieldBased

avi=H==avi.height ? avi : avi.Lanczos4Resize(W, H)
c2=avi.ChangeFPS("ntsc_video")

c2=c2.ConvertToYV12().ResampleAudio(R)


c1+c2

[Gavino]

tacman1123: Does your webcam video play OK on its own when sourced in a script by DirectShowSource? It seems to have a strange frame rate (25,26fps).

[Guest]

WHat's the point of this goofy line:

Global F = Framerate(AssumeFPS(BlankClip(),"ntsc_video"))

When you can use "ntsc_video" directly.

Also, try it all with AVISource rather than DirectShowSource.

[tacman1123]

Very odd -- the webcam clip by itself plays ok in Windows Media Player, and plays okay with AviSource(), but NOT with DirectShowSource. I thought DirectShowSource would play anything pretty much the same way you'd see it in Windows Media Player.

As for the goofy FrameRate line, I took that whole section from mikeytown2's Zoombox routines. There's a "Good Practices" thread at http://forum.doom9.org/showthread.php?p=1140113#post1140113 where it's mentioned.

My big problem with using AviSource is that often it fails, especially when I'm loading clips from my mini DV camera (specfically, AviSource doesn't load the audio, where DirectShowSource does).

I guess I could try to load the file with AviSource(), and if it didn't load audio then re-load it with DirectShowSource.

[Guest]

My big problem with using AviSource is that often it fails, especially when I'm loading clips from my mini DV camera (specfically, AviSource doesn't load the audio, where DirectShowSource does). Post a sample that does that, so we can get to the root cause and try to resolve it.

[kemuri-_9]

I've found for AVIs with AC3 audio, AVISource() will not be able to open the audio stream
I find it easiest to demux the audio out and use NicAudio() on it.

I imagine any similar audio codecs without installed ACM codecs used in the AVI container will have similar problems.

[mikeytown2]

@neuron2
he got the oddball line from my post here most likely
http://forum.doom9.org/showthread.php?p=1140888#post1140888

In short I did it that way so I didn't have to write 30000.0/1001.0 since ConvertFPS() only takes floats.

[IanB]

@mikeytown2,

RTFM! AssumeFPS, ChangeFPS and ConvertFPS all accept many forms.ConvertFPS (clip, float new_rate, int "zone", int "vbi")
ConvertFPS (clip, int numerator [, int denominator], int "zone", int "vbi")
ConvertFPS (clip1, clip2, int "zone", int "vbi")
ConvertFPS (clip, string preset, int "zone", int "vbi")

[mikeytown2]

went off the wiki, didn't see string so I assumed it didn't take it.
http://avisynth.org/mediawiki/ConvertFPS

[tacman1123]

@IanB Since the code you posted isn't in the wiki, where'd you get it from? Is there a manual to check against? Poking around, I see better documentation (at least for this call) at

http://avisynth.org.ru/docs/english/quick_ref.htm

I attempted to update the wiki to bring these into sync, but it's a template call (a little bit tricky), and it seems it takes me about 1/2 hour per change because of wiki captcha problems. I assume I'm not the only one who isn't updating the wiki because of tech issues.

[mikeytown2]

Manual is here most likely on your computer
C:/Program Files/AviSynth 2.5/Docs/english/index.htm

[Wilbert]

@IanB Since the code you posted isn't in the wiki, where'd you get it from? Is there a manual to check against? Poking around, I see better documentation (at least for this call) at

http://avisynth.org.ru/docs/english/quick_ref.htm

I attempted to update the wiki to bring these into sync, but it's a template call (a little bit tricky), and it seems it takes me about 1/2 hour per change because of wiki captcha problems. I assume I'm not the only one who isn't updating the wiki because of tech issues.
Apparently i forgot to update it. I will do this tomorrow.

[IanB]

What's the issue with the doco here? Everywhere I look it is correct. The lines I pasted came from the Wiki, and they are the same as the installed documentation. :confused:

[mikeytown2]

http://avisynth.org/mediawiki/index.php?title=FPS&action=history

[IanB]

went off the wiki, didn't see string so I assumed it didn't take it.
http://avisynth.org/mediawiki/ConvertFPSAnd your reference points to the correct documentation :confused:
http://avisynth.org/mediawiki/index.php?title=FPS&action=historyEven more confused, since the 2.5.7 update, the history just fixes a few typos here and there :confused: Very!

[Wilbert]

And your reference points to the correct documentation
I corrected it yesterday:

http://avisynth.org/mediawiki/index.php?title=FPS&diff=5541&oldid=5260

[IanB]

Okay I can see it now, I must have been looking just as you fixed it :o