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How to convert variable buffer size to fixed size

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Marc Rechté
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How to convert variable buffer size to fixed size

Marc Rechté
Hello,

Testing the Open-AVB gstreamer plugin (avbsink), I am trying to stream
the output of a UVC camera to an ethernet device, using this command:

# gst-launch-1.0 -e uvch264src device=/dev/video0 name=zoro
auto-start=true  zoro.vidsrc !
video/x-h264,width=1280,height=720,framerate=30/1 ! tee name=t ! queue !
avdec_h264 ! xvimagesink sync=false t. ! queue ! avbsink interface=enp2s0

The problem is that avbsink expects a fixed blocksize of 1024 bytes. The
uvch264src has no blocksize property.

Please would you have any suggestion to make sure blocks passed to
avbsink have a fixed size ?

Thanks



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Peter Maersk-Moller-2
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Re: How to convert variable buffer size to fixed size

Peter Maersk-Moller-2
The modules rndbuffersize and chopmydata can chop a stream of bytes into a fixed buffer size stream although I don't know if your protocol needs the chunks to be framed like RTP over TCP where a length specifier is needed.

Regards


On Wed, Mar 30, 2016 at 6:01 PM, Marc Rechte <[hidden email]> wrote:
Hello,

Testing the Open-AVB gstreamer plugin (avbsink), I am trying to stream the output of a UVC camera to an ethernet device, using this command:

# gst-launch-1.0 -e uvch264src device=/dev/video0 name=zoro auto-start=true  zoro.vidsrc ! video/x-h264,width=1280,height=720,framerate=30/1 ! tee name=t ! queue ! avdec_h264 ! xvimagesink sync=false t. ! queue ! avbsink interface=enp2s0

The problem is that avbsink expects a fixed blocksize of 1024 bytes. The uvch264src has no blocksize property.

Please would you have any suggestion to make sure blocks passed to avbsink have a fixed size ?

Thanks



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Nicolas Dufresne-4
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Re: How to convert variable buffer size to fixed size

Nicolas Dufresne-4
Le mercredi 30 mars 2016 à 18:27 +0200, Peter Maersk-Moller a écrit :
The modules rndbuffersize and chopmydata can chop a stream of bytes into a fixed buffer size stream although I don't know if your protocol needs the chunks to be framed like RTP over TCP where a length specifier is needed.

Also, arguably, avbsink element should handle this trivial transformation by itself.  Please report the issue to the author. This is a third party plugin.



Regards


On Wed, Mar 30, 2016 at 6:01 PM, Marc Rechte <[hidden email]> wrote:
Hello,

Testing the Open-AVB gstreamer plugin (avbsink), I am trying to stream the output of a UVC camera to an ethernet device, using this command:

# gst-launch-1.0 -e uvch264src device=/dev/video0 name=zoro auto-start=true  zoro.vidsrc ! video/x-h264,width=1280,height=720,framerate=30/1 ! tee name=t ! queue ! avdec_h264 ! xvimagesink sync=false t. ! queue ! avbsink interface=enp2s0

The problem is that avbsink expects a fixed blocksize of 1024 bytes. The uvch264src has no blocksize property.

Please would you have any suggestion to make sure blocks passed to avbsink have a fixed size ?

Thanks



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Marc Rechté
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Re: How to convert variable buffer size to fixed size

Marc Rechté
Thanks a  lot for the suggestion, I posted an issue to the Open-AVB project.

Would you suggest some plugin to study in order to temporarily implement this missing conversion myself ?

Marc

Le 30/03/2016 19:06, Nicolas Dufresne a écrit :
Le mercredi 30 mars 2016 à 18:27 +0200, Peter Maersk-Moller a écrit :
The modules rndbuffersize and chopmydata can chop a stream of bytes into a fixed buffer size stream although I don't know if your protocol needs the chunks to be framed like RTP over TCP where a length specifier is needed.

Also, arguably, avbsink element should handle this trivial transformation by itself.  Please report the issue to the author. This is a third party plugin.



Regards


On Wed, Mar 30, 2016 at 6:01 PM, Marc Rechte <[hidden email]> wrote:
Hello,

Testing the Open-AVB gstreamer plugin (avbsink), I am trying to stream the output of a UVC camera to an ethernet device, using this command:

# gst-launch-1.0 -e uvch264src device=/dev/video0 name=zoro auto-start=true  zoro.vidsrc ! video/x-h264,width=1280,height=720,framerate=30/1 ! tee name=t ! queue ! avdec_h264 ! xvimagesink sync=false t. ! queue ! avbsink interface=enp2s0

The problem is that avbsink expects a fixed blocksize of 1024 bytes. The uvch264src has no blocksize property.

Please would you have any suggestion to make sure blocks passed to avbsink have a fixed size ?

Thanks



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