splicing HD and SD formats together with AviSynth

[PapaDmitry]

Question about splicing together two clips recorded with either a camcorder (HV40) and one of the many portable/helmet SD cams out there.

1.How do I combine the uncompressed HV40 video with the already compressed (say H264 or other) portable camera files? I'm used to using AviSynth which compresses my raw AVI's using the H264 codec. But the portable camera file is already H264!

2.A lot of the portable cams are still SD, so can the two formats (HD + SD) be in the same video clip? How does one splice an HD and an SD clips with AviSynth?

[guns1inger]

Actually, avisynth doesn't compress video at all. It frameserves uncompressed video to an encoder of your choice, which then does the compressing.

Your HV40 footage is already compressed with HD mpeg-2. To bring the two together you have to either

1. Downsize the HD footage to match the SD footage
2. Upscale the SD footage to match the HD footage
3. Border the SD footage so the total frame size matches the HD footage, but the actual SD video isn't upscaled, or is only partially upscaled.

All of this can be done by avisynth

[jagabo]

hd=WhateverSource("hd.ext") #note HV40 is 1440x1080i anamorphic
sd=WhateverSource("sd.ext").BilinearResize(1080, 1080).AddBorders(180, 0, 180, 0)
return(hd+sd)

Or

hd=WhateverSource("hd.ext").BilinearResize(1920, 1080)
sd=WhateverSource("sd.ext").BilinearResize(1440, 1080).AddBorders(240, 0, 240, 0)
return(hd+sd)

Note, this assumes the SD is progressive, not interlaced, and both use the same colorspace.