Lossless Codec for Gray 8-Bit and Matroska

[Gabriel Neumüller]

Hi all,

I’m looking for an Lossless codec (encoder) which supports the Grayscale 8-Bit video/x-raw-gray Format and is also supported by the matroska Muxer.

I’ve tried ffenc_huffyuv where gst-inspect says, that it supports video/x-raw-gray But in my program when I get the sourcePad Capabilities from the encoder. There is no x-raw-graw, only color formats are listed.

For ffenc_vhuff and ffenc_ffv1 it’s the same.

 

So does anybody know an appropriate Codec? Or did I missed something and the Mentioned Codecs above work also for grayscale?

 

Thanks in advance

Horst

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[pfarmer]

I think there is none available. Since I was searching as well.
Matroskamux accepts the following:
video/x-raw-yuv format: { YUY2, I420, YV12, UYVY, AYUV }, video/x-huffyuv, video/x-dirac
So just huffman and dirac compression.
The only dirac encoder I know is diracenc, which accepts only video/x-raw-yuv format: { I420, YUY2, UYVY, AYUV }
The only huffman encoders I could find were: ffenc_ffvhuff and ffenc_huffyuv.
Both stating as capabilities: video/x-raw-rgb, video/x-raw-yuv, video/x-raw-gray
But none of them supporting the video/x-raw-gray streams (like your ffenc_vhuff and ffenc_ffv1 encoders)

I would be interested also in any encoder capable for video/x-raw-gray streams suitable also for other container formats. If anybody knows please let me know

[Gabriel Neumüller]

I came to the conclusion using Motionjpeg (jpegenc) and Matroska with
grayscale videos and setting the quality to 100.
It's not lossless, but I hope it has enough quality for my effort.

Maybe it's possible to develop an grayscale version of the huffyuv Encoder,
but I don't know anything about the huffyuv encoding algorithm.



-----Ursprüngliche Nachricht-----
Von:
gstreamer-devel-bounces+horsthuchen=[hidden email]
[mailto:gstreamer-devel-bounces+horsthuchen=[hidden email]
.org] Im Auftrag von pfarmer
Gesendet: Donnerstag, 2. Februar 2012 14:53
An: [hidden email]
Betreff: Re: Lossless Codec for Gray 8-Bit and Matroska

I think there is none available. Since I was searching as well.
Matroskamux accepts the following:
video/x-raw-yuv format: { YUY2, I420, YV12, UYVY, AYUV }, video/x-huffyuv,
video/x-dirac So just huffman and dirac compression.
The only dirac encoder I know is diracenc, which accepts only
video/x-raw-yuv format: { I420, YUY2, UYVY, AYUV } The only huffman encoders
I could find were: ffenc_ffvhuff and ffenc_huffyuv.
Both stating as capabilities: video/x-raw-rgb, video/x-raw-yuv,
video/x-raw-gray But none of them supporting the video/x-raw-gray streams
(like your ffenc_vhuff and ffenc_ffv1 encoders)

I would be interested also in any encoder capable for video/x-raw-gray
streams suitable also for other container formats. If anybody knows please
let me know


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[David Schleef]

On Thu, Feb 02, 2012 at 04:32:42PM +0100, Horst Huchen wrote:
> I came to the conclusion using Motionjpeg (jpegenc) and Matroska with
> grayscale videos and setting the quality to 100.
> It's not lossless, but I hope it has enough quality for my effort.
>
> Maybe it's possible to develop an grayscale version of the huffyuv Encoder,
> but I don't know anything about the huffyuv encoding algorithm.

Is there any specific reason you need a greyscale codec, as opposed
to encoding YUV images that merely happen to be grey?



David

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[Gabriel Neumüller]

I have a grayscale camera and I would like to store their images.
And I don't understand why I should store additional color information.
Or isn't there any difference of the file size when storing greyscale in YUV
instead of storing it directly into an gray format?

-----Ursprüngliche Nachricht-----
Von:
gstreamer-devel-bounces+horsthuchen=[hidden email]
[mailto:gstreamer-devel-bounces+horsthuchen=[hidden email]
.org] Im Auftrag von David Schleef
Gesendet: Donnerstag, 2. Februar 2012 20:34
An: Discussion of the development of and with GStreamer
Betreff: Re: Lossless Codec for Gray 8-Bit and Matroska

On Thu, Feb 02, 2012 at 04:32:42PM +0100, Horst Huchen wrote:
> I came to the conclusion using Motionjpeg (jpegenc) and Matroska with
> grayscale videos and setting the quality to 100.
> It's not lossless, but I hope it has enough quality for my effort.
>
> Maybe it's possible to develop an grayscale version of the huffyuv
> Encoder, but I don't know anything about the huffyuv encoding algorithm.

Is there any specific reason you need a greyscale codec, as opposed to
encoding YUV images that merely happen to be grey?



David

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