YUV-Bitmap Import filter?

[ac-chan123]

If i'm right, then this was something that mjpegtools createt and is now used by all Video Tools under Linux(ffmpeg, mplayer, transcode, ...)
Some c code can be found at http://parallel.vub.ac.be/~johan/MpegStills/ .

[Wilbert]

avs2yuv also creates it (it creates planar I420)

http://students.washington.edu/loren...synth/avs2yuv/

akupenguin wrote it. So i'm sure he can help if necessary

This is newer c code:

http://cvs.sourceforge.net/viewcvs.p...utils/#dirlist

Apperently more colorformats are supported, but simply I420 would be sufficient for now.

[WarpEnterprises]

1) Good news: if you use avs2yuv with -raw and then RawSource(filename, width, height, "YV12") it works already. When using "I420" U/V are permuted - I'm sorry I confused I420 and YV12.

2) Using the native format will be a little more work, as the frame positions are theoretically not equally spaced (the FRAME header can be different). But if I assume that there is no data in the frame header it makes it much easier. This will be always the case if the stream is not "interlaced mixed" - which AviSynth can't handle AND if there are no "metadata" of variable length.

[Wilbert]

1) Good news: if you use avs2yuv with -raw and then RawSource(filename, width, height, "YV12") it works already.

I know. Fred asked me about it and he's using TyTool (which outputs YUV4MPEG). So, that's why i asked you. I asked Fred to send a sample stream to me.

When using "I420" U/V are permuted - I'm sorry I confused I420 and YV12.

Are you sure? It's not the case that avs2yuv accidentely outputs YV12? I'm at work, can't check it now.

2) Using the native format will be a little more work, as the frame positions are theoretically not equally spaced (the FRAME header can be different). But if I assume that there is no data in the frame header it makes it much easier. This will be always the case if the stream is not "interlaced mixed" - which AviSynth can't handle AND if there are no
"metadata" of variable length.

I asked Fred to check/ask what kind of YUV4MPEG stuff TyTool outputs. I will let you know if he responds.

btw, what kind of data is "metadata" of variable length?

[WarpEnterprises]

I attach the specs for the header, there is not mentioned, what exactly the metadata should be used for. Maybe something like DG's hints?

[FredThompson]

Originally posted by Wilbert
I know. Fred asked me about it and he's using TyTool (which outputs YUV4MPEG). So, that's why i asked you. I asked Fred to send a sample stream to me.

..

I asked Fred to check/ask what kind of YUV4MPEG stuff TyTool outputs. I will let you know if he responds.

TyTool's author is now active here as "jdiner". There's some chatting between him and nic over in the MPEG2 encoders area. He's a better source than me for the samples you want. I can grab them as TyTool processes but it's quite awkward.

[jdiner]

I would be happy to provide some source metrics. I also sent out a PM with the details of what TyTool is doing with it.

I am new to this forum and uncertain what the rules are here for posting, size-wise etc... Until I can get caught up on such then please feel free to make requests and I will fill them as fast as I can.

EDIT: I suppose I should add that I can provide the C++ source I use to make the files, although it is small enough not to be of that much use, and if I can find it the C++ source I wrote to load the files as well. (haven't seen it in a while but a grep search should turn it up if anyone wants to see it.)

--jdiner

[WarpEnterprises]

check this if it's doing what you thought of:

http://www.avisynth.org/warpenterpri...l_20050412.zip

[FredThompson]

Heh, you just might be my hero!

Not, like, in that way...harumph...how bout that football team, yeah!

[Wilbert]

So, it works for you?

Btw, could you upload a YUV4MPEG sample?

[jdiner]

Originally posted by Wilbert
So, it works for you?

Btw, could you upload a YUV4MPEG sample?

I have not tested it. Hopefully FredThompson has been able to do so.

Here is a sample y4m file, YUV4MPEG, as requested. It has been packed up as a zip file.

--jdiner

[jdiner]

Humm. I am used to attachments showing up immediately in other forums. I assume it didn't here because there is some kind of moderator oversight.

Anyway it has been posted, hopefully it will appear here soon.

--jdiner

[WarpEnterprises]

There were two bugs in the rawsource-DLL. Please try the new version.
(rawsource_25_dll_20050414.zip)

[billou2k]

Hi thanks WarpEnt for still improving rawsource I think that is a very useful filter indeed!

I've just tried the latest version (20050414) and it looks like when importing raw YV12 the U and V channels are swapped. (swapUV() function fixes the colour problem)
I tried again the same clip with the 2004.05. version and colours are fine.

Could there be some code from the YV12 mode changed by adding the support for YUV4MPEG?

Cheers

[Wilbert]

@jdiner,

If your sample consists out of one frame (?), then it loads fine

[jdiner]

Originally posted by Wilbert
@jdiner,

If your sample consists out of one frame (?), then it loads fine

No. It had several frames in it. 4 I think.

I will have to download what was uploaded and make sure. I will post my results.

EDIT: My appologies. I remember now having to cut it down to get it small enough to post here. There are 2 frames in there.

HEADER FRAME (data) FRAME (data) [EOF]

I can make one of larger sized file with 10 or more frames in it if someone can host it. I will see if I can get my old BSD box un-mothballed. Until that happens anyone want to host a 4 or 5 meg ZIP file?

--jdiner

[FredThompson]

Cut it into chunks (WinRAR, HJ-Split, etc.) and email it to me. I'll host it and any other samples you want posted.

[WarpEnterprises]

@billou2k: in the latest version U/V is intentionally swapped since I think it was wrong before. You can use "I420" or "YV12" as format strings, one of them will do it (no need to SwapUV, which of course will work too).

[FredThompson]

Here's a 29-frame YUV4MPEG sample from jdiner

http://home.mindspring.com/~utils/29frames.rar

[WarpEnterprises]

29frames.y4m works for me.