Determining the Color Space of a file

[Alwyn]

Mediainfo reports of AmarecTV captures don't show the Color Space of a captured file (for me, at least! ).

Could somebody please describe how to determine the color space of a file using VDub, AVISynth or some other program?

Thanks.

[ProWo]

Post the mediainfo report (text mode) here.

[lollo]

Color space (YUV) and Chroma subsampling (4:2:2) are properly reported.



Maybe you refer to BT 601/Rec.601 Color matrix? I ignore how.

[Alwyn]

I'm deflated that you think I don't know what I'm doing.

Amarec file:

General
Complete name : H:\Capture Colour Format Tests\GVUSB2 LAGS RGB(20240209-1805).avi
Format : AVI
Format/Info : Audio Video Interleave
Format settings : WaveFormatEx
File size : 120 MiB
Duration : 15 s 760 ms
Overall bit rate : 64.0 Mb/s
Frame rate : 25.000 FPS

Video
ID : 0
Format : Lagarith
Codec ID : LAGS
Duration : 15 s 760 ms
Bit rate : 59.9 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate : 25.000 FPS
Standard : PAL
Bits/(Pixel*Frame) : 5.779
Stream size : 113 MiB (94%)

Audio
ID : 1
Format : PCM
Format settings : Little / Signed
Codec ID : 1
Duration : 15 s 760 ms
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 2.89 MiB (2%)
Alignment : Aligned on interleaves

VDub file:

General
Complete name : H:\Capture Colour Format Tests\LAGS VDub Compression Configure set to RGB.avi
Format : AVI
Format/Info : Audio Video Interleave
Format settings : WaveFormatEx
File size : 46.7 MiB
Duration : 6 s 480 ms
Overall bit rate : 60.4 Mb/s
Frame rate : 25.000 FPS

Video
ID : 0
Format : Lagarith
Codec ID : LAGS
Duration : 6 s 480 ms
Bit rate : 58.9 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 8 bits
Bits/(Pixel*Frame) : 5.679
Stream size : 45.5 MiB (97%)

Audio
ID : 1
Format : PCM
Format settings : Little / Signed
Codec ID : 1
Duration : 6 s 451 ms
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 1.18 MiB (3%)
Alignment : Aligned on interleaves
Interleave, duration : 50 ms (1.26 video frame)
Interleave, preload duration : 49 ms

Same with MagicYUV.

So... Could somebody please describe how to determine the color space of a file using VDub, AVISynth or some other program?

[Alwyn]

Arr, found an old Doom9 thread that said use ".info". It gave this report:


[Attachment 76887 - Click to enlarge]

I am now confused . is YUY2 the same as YUV?

[CM120884]

If you're using VDub, you can check the color space by going to Video -> Color Depth.

[Alwyn]

I'm not sure Color Depth shows the current color space:


[Attachment 76888 - Click to enlarge]

[DB83]

Am I being studid here ?

You own screen grabs(via vdub) show the color space as YUV.


What else do you want ?


Or, as prevously stated, confuse color space with chromo-subsampling ?

[Sharc]

So... Could somebody please describe how to determine the color space of a file using VDub, AVISynth or some other program?

In case a commandline is accepted, try

ffprobe -show_format -show_streams "%~1" |more
pause

[oln]

Arr, found an old Doom9 thread that said use ".info". It gave this report:


[Attachment 76887 - Click to enlarge]

I am now confused . is YUY2 the same as YUV?

YUY2 is 8-bit 4:2:2 YUV yes
https://www.loc.gov/preservation/digital/formats/fdd/fdd000364.shtml

It doesn't strictly say what variant of YUV it is though, if it's SD video it's most likely the Rec. 601 color matrix (of whatever standard (525 or 625 line) the clip is. I don't think the .avi container or lagarith codec have any way of encoding that metadata however so you would have to determine that by looking at the footage and/or judging by the source.

[Alwyn]

I've now tried AVIDemux, which reports YUV and 4:2:2 for my file but it seems as though it's got the colour format (??) wrong; it's showing all my SD VHS captures as BT709.

@Sharc, prefer not, no offence intended. I just want to quickly open a file, check it then move on. Anyway, how do I run that CLI? In the FFMPEG folder, and where do I put the filename?

Am I being studid here ?

RTFQ.
Hint: "AmarecTV".

[Alwyn]

@Oln, thanks. I'll raise AVIDemux's "BT709" (spurious) report on their forum.

[Sharc]

Anyway, how do I run that CLI? In the FFMPEG folder, and where do I put the filename?

Many ways.
For example:
Copy the text and save it as *whatevername*.cmd (e.g. fileinfo.cmd) on your desktop. Then drag and drop your video file onto that icon on your desktop.
You should have ffmpeg in the system path; otherwise you have to specify the full path for ffprobe.

[lollo]

I'm deflated that you think I don't know what I'm doing.

I did not think that, just providing an example of one of my HuffYUV AmarecTV capture

[jagabo]

AVI doesn't flag the color matrix. You have to keep track of it yourself. Some codecs may be able to flag it but software has to be specifically written to support it.

[Alwyn]

Thanks jagabo, the reason I asked was that Virtual Dub captures produce the color matrix in Mediainfo but AmarecTV captures don't (for LAGS and M8Y2 at least).