[gst-devel] PNG encoding produces empty file with ffenc_png

[Franz Trierweiler]

Hello,

Indeed, I made a try with pngenc but this one is not available on the Linux package provided by Freescale (i.MX25).
Maybe should I grab the project and recompile it for the ARM.

Franz

Le 8 avr. 2010 à 14:16, Stefan Kost a écrit :

> Franz TRIERWEILER wrote:
>> Hello,
>> 
>> I am trying on a Freescale ARM-based board to encode JPEG or PNG
>> picture from a webcam source through gst-launch this way:
>> 
>> gst-launch-0.10 --verbose v4l2src num-buffers=1 ! ffenc_png ! 
>> filesink location=toto.png
>> 
>> (I was advised by Freescal support to set num-buffers to 1 because
>> gst-launch never gets out).
> Just also use pngenc on the freescaleboard. If you can't for whatever
> reasons, you will need to dig into bthe differences and figure whats the
> bug on the ffenc_png element.
> 
> Stefan
> 
>> 
>> The result is as follows and produces an empty file:
>> 
>> Setting pipeline to PAUSED ...
>> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps =
>> video/x-raw-yuv, 1
>> Pipeline is live and does not need PREROLL ...
>> Setting pipeline to PLAYING ...
>> New clock: GstSystemClock
>> /GstPipeline:pipeline0/ffenc_png:ffenc_png0.GstPad:src: caps =
>> image/png, width1
>> /GstPipeline:pipeline0/ffenc_png:ffenc_png0.GstPad:sink: caps =
>> video/x-raw-yuv1
>> Got EOS from element "pipeline0".
>> Execution ended after 7175133452 ns.
>> Setting pipeline to PAUSED ...
>> Setting pipeline to READY ...
>> /GstPipeline:pipeline0/ffenc_png:ffenc_png0.GstPad:src: caps = NULL
>> /GstPipeline:pipeline0/ffenc_png:ffenc_png0.GstPad:sink: caps = NULL
>> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = NULL
>> Setting pipeline to NULL ...
>> Freeing pipeline ...
>> root at freescale ~$ ls
>> 
>> When I try the same command on an Ubuntu system with the same webcam
>> (*replacing ffenc_png with pngenc - I do not know why pngenc has been
>> replaced with ffenc_png on the Freescale Linux distro*) then I get a
>> right PNG file:
>> 
>> gst-launch-0.10 --verbose v4l2src num-buffers=1 ! pngenc !  filesink
>> location=toto.png
>> 
>> This produces:
>> Définition du pipeline à PAUSED...
>> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps =
>> video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)16711680,
>> green_mask=(int)65280, blue_mask=(int)255, endianness=(int)4321,
>> width=(int)640, height=(int)480, framerate=(fraction)30/1
>> Le pipeline est actif et n'a pas besoin de phase PREROLL...
>> Passage du pipeline à la phase PLAYING...
>> New clock: GstSystemClock
>> /GstPipeline:pipeline0/GstPngEnc:pngenc0.GstPad:src: caps = image/png,
>> width=(int)640, height=(int)480, framerate=(fraction)30/1
>> /GstPipeline:pipeline0/GstPngEnc:pngenc0.GstPad:sink: caps =
>> video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)16711680,
>> green_mask=(int)65280, blue_mask=(int)255, endianness=(int)4321,
>> width=(int)640, height=(int)480, framerate=(fraction)30/1
>> /GstPipeline:pipeline0/GstFileSink:filesink0.GstPad:sink: caps =
>> image/png, width=(int)640, height=(int)480, framerate=(fraction)30/1
>> EOS reçu de l'élément « pipeline0 ».
>> Execution ended after 791913102 ns.
>> Définition du pipeline à PAUSED...
>> Définition du pipeline à READY (prêt)...
>> /GstPipeline:pipeline0/GstFileSink:filesink0.GstPad:sink: caps = NULL
>> /GstPipeline:pipeline0/GstPngEnc:pngenc0.GstPad:src: caps = NULL
>> /GstPipeline:pipeline0/GstPngEnc:pngenc0.GstPad:sink: caps = NULL
>> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = NULL
>> Définition du pipeline à NULL...
>> Libération du pipeline (FREE)...
>> 
>> On Ubuntu, the first pipe gives more information about the v4l2src,
>> not on the Freescale.
>> 
>> What I know is that the webcam is providing video data since I can
>> fill a file when I simply do:
>> 
>> gst-launch-0.10 --verbose v4l2src num-buffers=1 ! filesink loc
>> ation=toto.raw
>> 
>> I am ready to provide more information if required for debugging this.
>> My first goal is:
>> 1- Do I use the correct syntax with ffenc_png?
>> 2- What do the debug messages mean?
>> 
>> I have other issues with the jpeg encoding but first I prefer focusing
>> on PNG encoding.
>> 
>> Best Regards,
>> Franz
>> 
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> 
> 
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