Looking for alpha channel

[David Banner]

How would you check for an alpha channel in the file below.? It was shot with a Nikon D3200. What does Color space : YUV and how does it relate to RGBA. In vegas right click properties/media/alpha channel says none. I read if there was an alpha channel in an RGBA it would be 32 bits. Where would 32 bits be mentioned?

I want to make something similar to https://www.youtube.com/watch?v=Ti8MoqmQzuM which is from https://forum.videohelp.com/threads/386246-How-can-I-make-this-effect#post2504976

I will be using Vegas 13 Pro. My cameras are Nikon d3200 and Panasonic TZ60. The TZ60 also says colour space YUV

General
Complete name : C:\Users\MYFILM.MOV
Format : MPEG-4
Format profile : QuickTime
Codec ID : qt 2007.09 (qt /niko)
File size : 36.8 MiB
Duration : 13 s 13 ms
Overall bit rate : 23.7 Mb/s
Encoded date : UTC 2014-11-12 11:41:59
Tagged date : UTC 2014-11-12 11:41:59
NCDT : NCTG

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Format settings, GOP : M=3, N=12
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 13 s 13 ms
Bit rate : 22.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.443
Stream size : 34.2 MiB (93%)
Language : English
Encoded date : UTC 2014-11-12 11:41:59
Tagged date : UTC 2014-11-12 11:41:59
Color range : Full
Color primaries : BT.709
Matrix coefficients : BT.601
colour_primaries_Original : BT.709
transfer_characteristics_Original : BT.470 System M
matrix_coefficients_Original : BT.601

Audio
ID : 2
Format : PCM
Format settings, Endianness : Little
Format settings, Sign : Signed
Codec ID : sowt
Duration : 13 s 13 ms
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 2.38 MiB (6%)
Language : English
Encoded date : UTC 2014-11-12 11:41:59
Tagged date : UTC 2014-11-12 11:41:59

[poisondeathray]

How would you check for an alpha channel in the file below.? It was shot with a Nikon D3200. What does Color space : YUV and how does it relate to RGBA. In vegas right click properties/media/alpha channel says none. I read if there was an alpha channel in an RGBA it would be 32 bits. Where would 32 bits be mentioned?

YUV is a different color space / color model than RGB, it's usually chroma subsampled to save bandwidth. Most consumer acquistion formats are YUV 4:2:0, where the color information is half width, half height

Cameras usually never shoot with an alpha channel. The exception would be a live key in a studio setup ( e.g. weatherman inside studio, shooting over a background) . If you green or blue screen key, then the keyed out green/blue becomes "transparent" and that transparency information is contained in the alpha channel

Mediainfo does not always indicate if an alpha channel is present for all formats, and even if it does, sometimes it's just a "dummy" or fake alpha channel (not necessarily a valid one). So it's not necessarily a reliable tool. If it does indicate one, it will usually say color space "RGBA"

[David Banner]

How would you check for an alpha channel in the file below.? It was shot with a Nikon D3200. What does Color space : YUV and how does it relate to RGBA. In vegas right click properties/media/alpha channel says none. I read if there was an alpha channel in an RGBA it would be 32 bits. Where would 32 bits be mentioned?

YUV is a different color space / color model than RGB, it's usually chroma subsampled to save bandwidth. Most consumer acquistion formats are YUV 4:2:0, where the color information is half width, half height

Cameras usually never shoot with an alpha channel. The exception would be a live key in a studio setup ( e.g. weatherman inside studio, shooting over a background) . If you green or blue screen key, then the keyed out green/blue becomes "transparent" and that transparency information is contained in the alpha channel

Mediainfo does not always indicate if an alpha channel is present for all formats, and even if it does, sometimes it's just a "dummy" or fake alpha channel (not necessarily a valid one). So it's not necessarily a reliable tool. If it does indicate one, it will usually say color space "RGBA"

How do i make an alpha in Vegas then? Or should i make a png in photoshop and import to vegas. Thanks

[poisondeathray]

How do i make an alpha in Vegas then? Or should i make a png in photoshop and import to vegas. Thanks

Yes, photoshop is one way.

If you generate something in vegas, it will usually have an alpha channel too

If you're trying to make a flat spinning 2D logo like that video, then it's usually easier to make it in other programs, then import into vegas

[mrbansal]

Basically, are you looking for a way to have an alpha channel as well as a fill channel coming from the computer and into the ATEM switcher? Are you needing to key the PPT over live video, set it back within live video or??? I'm a bit confused over just what you would need the final composite to look like. Tutuapp 9apps Aptoide