Playing two videos at the same time...

[quetzalin]

Hi!, i'm trying to stack two videos and play them at the same time, side by side. They also need some syncing.

Webcam video info:

Video: Windows Media Video 9 720x576 30fps 936kbps [Raw Video 1]
Audio: WMA 2 44100Hz stereo 64kbps [Raw Audio 0]

General
Complete name                  : C:\Users\MMedia\Desktop\xornada_r\bck\VConf_CNTG_LenguajeR_10102013_(Mañan)_[Video].wmv
Format                         : Windows Media
File size                      : 1.18 GiB
Duration                       : 4h 2mn
Overall bit rate mode          : Constant
Overall bit rate               : 697 Kbps
Maximum Overall bit rate       : 1 012 Kbps
Encoded date                   : UTC 2013-10-11 15:19:02.761

Video
ID                             : 2
Format                         : VC-1
Format profile                 : MP@HL
Codec ID                       : WMV3
Codec ID/Info                  : Windows Media Video 9
Codec ID/Hint                  : WMV3
Description of the codec       : Windows Media Video 9
Duration                       : 4h 2mn
Bit rate mode                  : Constant
Bit rate                       : 936 Kbps
Width                          : 720 pixels
Height                         : 576 pixels
Display aspect ratio           : 5:4
Frame rate                     : 29.970 fps
Nominal frame rate             : 30.000 fps
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Progressive
Compression mode               : Lossy
Bits/(Pixel*Frame)             : 0.075
Stream size                    : 1.59 GiB
Language                       : Spanish

Audio
ID                             : 1
Format                         : WMA
Format version                 : Version 2
Codec ID                       : 161
Codec ID/Info                  : Windows Media Audio
Description of the codec       : Windows Media Audio 9.2 -  64 kbps, 44 kHz, stereo (A/V) 1-pass CBR
Duration                       : 4h 2mn
Bit rate mode                  : Constant
Bit rate                       : 64.0 Kbps
Channel(s)                     : 2 channels
Sampling rate                  : 44.1 KHz
Bit depth                      : 16 bits
Stream size                    : 111 MiB (9%)

Computer screen capture

Video: Flash Video 1 1024x768 15fps 8647kbps [V: flv, yuv420p, 1024x768, 8647 kb/s]

General
Complete name                  : C:\Users\MMedia\Desktop\xornada_r\bck\VConf_CNTG_LenguajeR_10102013_(Mañan)__[DatosVNC].flv
Format                         : Flash Video
File size                      : 973 MiB
Duration                       : 4h 15mn
Overall bit rate               : 533 Kbps

Video
Format                         : Sorenson Spark
Codec ID                       : 2
Duration                       : 4h 15mn
Bit rate                       : 8 445 Kbps
Width                          : 1 024 pixels
Height                         : 768 pixels
Display aspect ratio           : 4:3
Frame rate mode                : Constant
Frame rate                     : 1 000.000 fps
Bit depth                      : 8 bits
Bits/(Pixel*Frame)             : 0.011
Stream size                    : 15.1 GiB

As you can see both videos are completly different (i don't want to mention the person who recorded them with those formats.... sigh). The first is a webcam recording from someone speaking and the other one is a capture of the computer screen with a presentation.

And this is my Avisynth script at the moment on MeGUI:

global MeGUI_darx = 8
global MeGUI_dary = 3

input1="video.wmv"
DirectShowSource(input1)
LanczosResize(768,576)
ConvertToYV12
duration=0
a=Trim(round(duration*FrameRate),0)

input2="video.flv"
DirectShowSource(input2)
LanczosResize(768,576)
ConvertToYV12
duration=725
b=Trim(round(duration*FrameRate),0)

StackHorizontal(a,b)

The reason about Trim is becaused i need to sync them, and since the .flv one starts about 725sec (12min and 5 seconds) sooner i just cut the beginning.

I'm also encoding the final video to mp4 (H264).

So far, i achieved my goal but there is a problem, and i guess it is related to the FPS difference (30 on the .wmv vs 15 on the .flv) on the conversion, on the final video, the "b" video plays 2x faster.

I can't figure how to fix this, i know about ConvertFPS but don't know how it can be used here. Maybe i should encode both videos separately first to match the fps with the next script?:

DirectShowSource("NTSC_clip.avi")  
Bob(height=576)    
LanczosResize(768,576)  
ConvertFPS(50) 
SeparateFields.SelectEvery(4,0,3)
Weave

Thanks!

[sheppaul]

try this one.
http://forum.doom9.org/showthread.php?t=171765



DualView Screenshot
http://hammultiplayer.org/Images/M_DualV.png