Strange Lagarith Colorspace Causing Problems

[SameSelf]

I have several Lagarith intermediate AVI's that I am trying to stitch together. I wrote them all out exactly alike, or so I thought. Now sadly Avisynth video1 ++ video2 is complaining. Here are the mediainfo side by side:

Video1 looks normal, but I can't for the life of me determine what on earth video2 is. Colorspace Y? I have tried re-exporting from PPro a few times to see if I can re-create the video2 specs, but no luck. Should I just assume these videos are corrupt? Please help!

General
Complete name               : E:\video1.avi
Format                      : AVI
Format/Info                 : Audio Video Interleave
Format profile              : OpenDML
File size                   : 13.2 GiB
Duration                    : 4mn 24s
Overall bit rate            : 427 Mbps

Video
ID                          : 0
Format                      : Lagarith
Codec ID                    : LAGS
Duration                    : 4mn 24s
Bit rate                    : 427 Mbps
Width                       : 1 920 pixels
Height                      : 1 080 pixels
Display aspect ratio        : 16:9
Frame rate                  : 29.970 fps
Color space                 : YUV
Chroma subsampling          : 4:2:2
Bit depth                   : 8 bits
Bits/(Pixel*Frame)          : 6.877
Stream size                 : 13.2 GiB (100%)

General
Complete name               : E:\video2.avi
Format                      : AVI
Format/Info                 : Audio Video Interleave
Format profile              : OpenDML
File size                   : 16.9 GiB
Duration                    : 4mn 22s
Overall bit rate            : 553 Mbps

Video
ID                          : 0
Format                      : Lagarith
Codec ID                    : LAGS
Duration                    : 4mn 22s
Bit rate                    : 553 Mbps
Width                       : 1 920 pixels
Height                      : 1 080 pixels
Display aspect ratio        : 16:9
Frame rate                  : 29.970 fps
Color space                 : Y
Bits/(Pixel*Frame)          : 8.900
Stream size                 : 16.9 GiB (100%)

[SameSelf]

If anyone can add some insight into this problem that would be great. For now though, I have figured out a work around with the following code:

video1 = AVISource("E:\VIDEO1.avi", audio=false).AssumeFPS(30000,1001).ConvertToYV12(interlaced=false, matrix="rec709")
video2 = AVISource("E:\VIDEO2.avi", audio=false).AssumeFPS(30000,1001).ConvertToYV12(interlaced=false, matrix="rec709")

video1 ++ video2

[jagabo]

You can look at the output of AviSource with Info(). My guess is you used different colorspaces for the two videos (lagarith can work in RGB, RGBA, YUY2 or YV12 modes).

[SameSelf]

Good suggestion. Here are the infos from video1 and video2 respectively:




So you were right on! That Colorspace Y, should have really read RGB. Lesson learned, Avisynth is your friend. Thanks

[jagabo]

About the only sources that should be RGB are computer generated images. Video sources are usually YUV 4:2:2 or 4:2:0 and you should avoid converting them to RGB when possible.

[SameSelf]

Indeed, it was my fault because Lagarith defaults to RGB in PPro, and I wasn't thorough enough in checking the settings before exporting. At this point in my project though, I will just chalk it up to lessons learned but not forgotten.