vsrawsource - Raw Video Reader for VapourSynth

[Myrsloik]

Originally Posted by ddubya

I have fixed a bunch of bugs in vsrawsource and almost done adding tests. Also I have added capability to read from a pipe (not tested on windows yet).

I have not compiled or tested on windows yet, if you want to help go for it.

https://github.com/walisser/vsrawsource

I've had a go at making it compile on windows. Btw, snprintf works just fine in vs2015 so don't just mindlessly copy and paste compatibility stuff.

I'm going to test my changes and then make a pull request I guess.

[Efenstor]

Originally Posted by jackoneill

video = core.raws.Source("/dev/stdin", 1920, 1080, 30000, 1001)

Ouch. Never though it would be that simple and obvious.

[ddubya]

Use "/dev/stdin" as the file path (it needs to be a path) instead of sys.stdin

[Myrsloik]

Here are compiled windows binaries.

[kolak]

Going to try.

[kolak]

import vapoursynth as vs
import sys
core = vs.get_core()

clip = core.raws.Source("/dev/stdin")
clip = core.fmtc.bitdepth (clip, bits=10)
clip.set_output()
enable_v210 = True

with:
ffmpeg -i C:\Users\Andy\Desktop\50i.avi -f yuv4mpegpipe - | "C:\Program Files (x86)\VapourSynth\core64\vspipe.exe" --y4m C:\Users\Andy\Desktop\rr.vpy - | C:\ffmpeg.exe -i - -c:v v210 C:\Users\Andy\Desktop\vv.mov

doesn't work, giving error:

Output #0, yuv4mpegpipe, to 'pipe:':
Metadata:
encoder : Lavf57.44.100
Stream #0:0: Video: wrapped_avframe, yuv422p, 1920x1080, q=2-31, 200 kb/s, 2
5 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc57.51.100 wrapped_avframe
Stream mapping:
Stream #0:0 -> #0:0 (utvideo (native) -> wrapped_avframe (native))
Press [q] to stop, [?] for help
Script evaluation failed:
Python exception: raws: source does not exist.
Traceback (most recent call last):
File "src\cython\vapoursynth.pyx", line 1491, in vapoursynth.vpy_evaluateScrip
t (src\cython\vapoursynth.c:26897)
File "C:\Users\Andy\Desktop\rr.vpy", line 5, in <module>
clip = core.raws.Source("/dev/stdin")
File "src\cython\vapoursynth.pyx", line 1383, in vapoursynth.Function.__call__
(src\cython\vapoursynth.c:25204)
vapoursynth.Error: raws: source does not exist.

looks like /dev/stdin doesn't work.

[sl1pkn07]

/dev/stdin sounds a linux

[kolak]

Yes, but been told it should work here also I've read it won't on Windows.


More issues:

clip = core.raws.Source("C:\Users\Andy\Desktop\vv.raw", 1920, 1080, 30000, 1001, src_fmt='YUV422P10')

gives strange error:

Script evaluation failed:
Python exception: (unicode error) 'unicodeescape' codec can't decode bytes in po
sition 2-3: truncated \UXXXXXXXX escape (rr.vpy, line 4)
Traceback (most recent call last):
File "src\cython\vapoursynth.pyx", line 1490, in vapoursynth.vpy_evaluateScrip
t (src\cython\vapoursynth.c:26883)
File "C:\Users\Andy\Desktop\rr.vpy", line 4
clip = core.raws.Source("C:\Users\Andy\Desktop\vv.raw", 1920, 1080, 30000, 1
001, src_fmt='YUV422P10')
^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in positio
n 2-3: truncated \UXXXXXXXX escape


Is this complaining about actual video data?

[ddubya]

Originally Posted by kolak

Is this complaining about actual video data?

No, if you want to use a literal backslash in a string, you must escape it with another backslash.

You can use forward slash instead or format like this

"C:\\folder1\\folder2\\file.raw"

etc.

[ddubya]

Originally Posted by kolak

looks like /dev/stdin doesn't work.

Yes, it needs the hack that treats the empty dash (-) as stdin, as is the usual convention.

In theory, you could run a pipe server and use names pipes as the ffmpeg ouput / vs input. I don't know of any command offhand that provides this.

[ddubya]

Changes pushed for opening from stdin, using "-"

[kolak]

Originally Posted by ddubya

No, if you want to use a literal backslash in a string, you must escape it with another backslash.

You can use forward slash instead or format like this

"C:\\folder1\\folder2\\file.raw"

etc.

OK, but this is related only to raw reader. Other plugins are fine with "normal" paths.

[kolak]

Originally Posted by ddubya

Changes pushed for opening from stdin, using "-"

Cool, need to wait for myrsloik to compile new version.

How I meant to use it after this change? Still:

clip = core.raws.Source("/dev/stdin")

?

[ddubya]

Originally Posted by kolak

OK, but this is related only to raw reader. Other plugins are fine with "normal" paths.

It isn't the plugin, its python. The backslash by itself is the escape character.

[ddubya]

Originally Posted by kolak

Cool, need to wait for myrsloik to compile new version.

How I meant to use it after this change? Still:

clip = core.raws.Source("/dev/stdin")

?

clip = core.raws.Source("-")

[kolak]

Originally Posted by ddubya

It isn't the plugin, its python. The backslash by itself is the escape character.

Ok, but other filters (ffms2, avi source) handle "normal" paths fine without any workaround (at least form the end user).

[kolak]

Originally Posted by ddubya

clip = core.raws.Source("-")

Easy enough

[Myrsloik]

Updated binaries

[kolak]

Thanks, but still no luck:

Python exception: raws: failed to open source file stdin in binary mode (for both rawvideo and y4m)

[Myrsloik]

I have a vague memory the code has to do it the windows api way. Using portable stuff won't work.

Or that it works often enough if you simply skip it on windows. That's what x264 seems to do anyway.