<html dir="ltr"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" id="owaParaStyle">  P {margin-top:0;margin-bottom:0;}</style> </head> <body fpstyle="1" ocsi="0"> <div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">> avenc_mjpeg does support GRAY16_BE/LE, but I don't know how to make it lossless.<br> <br> My mistake, avdec_mjpeg supports GRAY16_BE/LE, the encoder only supports I420,Y42B, and Y444. The conversion from GRAY16_LE->I420 seems to be lossless, so that's good. The trouble I'm running into now, though, is that avenc_ljpeg doesn't seem to want to accept YUV-colorspace buffers, even though its sink pad template says it can:<br> <br> Pad Templates:<br> SINK template: 'sink'<br> Availability: Always<br> Capabilities:<br> video/x-raw<br> format: { BGR, BGRA, I420, Y444, Y42B }<br> <br> This pipeline works fine:<br> gst-launch-1.0 -vvv filesrc location=source.g16 ! videoparse width=640 height=480 format=27 framerate=30/1 ! video/x-raw,format=GRAY16_LE,width=640,height=480,framerate=30/1 ! videoconvert ! video/x-raw,format=BGR ! avenc_ljpeg ! filesink location=losslessgr16.mjpg<br> <br> This does not:<br> gst-launch-1.0 -vvv filesrc location=source.g16 ! videoparse width=640 height=480 format=27 framerate=30/1 ! video/x-raw,format=GRAY16_LE,width=640,height=480,framerate=30/1 ! videoconvert ! video/x-raw,format=I420 ! avenc_ljpeg ! filesink location=losslessgr16.mjpg<br> Setting pipeline to PAUSED ...<br> Pipeline is PREROLLING ...<br> /GstPipeline:pipeline0/GstVideoParse:videoparse0.GstPad:src: caps = "video/x-raw\,\ format\=\(string\)GRAY16_LE\,\ width\=\(int\)640\,\ height\=\(int\)480\,\ interlace-mode\=\(string\)progressive\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ colorimetry\=\(string\)1:4:0:0\,\ framerate\=\(fraction\)30/1"<br> /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = "video/x-raw\,\ format\=\(string\)GRAY16_LE\,\ width\=\(int\)640\,\ height\=\(int\)480\,\ interlace-mode\=\(string\)progressive\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ colorimetry\=\(string\)1:4:0:0\,\ framerate\=\(fraction\)30/1"<br> /GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:src: caps = "video/x-raw\,\ width\=\(int\)640\,\ height\=\(int\)480\,\ interlace-mode\=\(string\)progressive\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ framerate\=\(fraction\)30/1\,\ format\=\(string\)I420"<br> /GstPipeline:pipeline0/GstCapsFilter:capsfilter1.GstPad:src: caps = "video/x-raw\,\ width\=\(int\)640\,\ height\=\(int\)480\,\ interlace-mode\=\(string\)progressive\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ framerate\=\(fraction\)30/1\,\ format\=\(string\)I420"<br> /GstPipeline:pipeline0/GstCapsFilter:capsfilter1.GstPad:sink: caps = "video/x-raw\,\ width\=\(int\)640\,\ height\=\(int\)480\,\ interlace-mode\=\(string\)progressive\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ framerate\=\(fraction\)30/1\,\ format\=\(string\)I420"<br> /GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:sink: caps = "video/x-raw\,\ format\=\(string\)GRAY16_LE\,\ width\=\(int\)640\,\ height\=\(int\)480\,\ interlace-mode\=\(string\)progressive\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ colorimetry\=\(string\)1:4:0:0\,\ framerate\=\(fraction\)30/1"<br> /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = "video/x-raw\,\ format\=\(string\)GRAY16_LE\,\ width\=\(int\)640\,\ height\=\(int\)480\,\ interlace-mode\=\(string\)progressive\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ colorimetry\=\(string\)1:4:0:0\,\ framerate\=\(fraction\)30/1"<br> ERROR: from element /GstPipeline:pipeline0/GstVideoParse:videoparse0: Internal data stream error.<br> Additional debug info:<br> gstrawparse.c(487): gst_raw_parse_loop (): /GstPipeline:pipeline0/GstVideoParse:videoparse0:<br> stream stopped, reason not-negotiated<br> ERROR: pipeline doesn't want to preroll.<br> Setting pipeline to NULL ...<br> /GstPipeline:pipeline0/GstCapsFilter:capsfilter1.GstPad:src: caps = "NULL"<br> /GstPipeline:pipeline0/GstCapsFilter:capsfilter1.GstPad:sink: caps = "NULL"<br> /GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:src: caps = "NULL"<br> /GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:sink: caps = "NULL"<br> /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = "NULL"<br> /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = "NULL"<br> /GstPipeline:pipeline0/GstVideoParse:videoparse0.GstPad:src: caps = "NULL"<br> Freeing pipeline ...<br> <br> Is this a bug in avenc_ljpeg, or did I not constrain the caps correctly?<br> <div style="font-family: Times New Roman; color: #000000; font-size: 16px"> <hr tabindex="-1"> <div id="divRpF841047" style="direction: ltr;"><font size="2" color="#000000" face="Tahoma"><b>From:</b> gstreamer-devel [gstreamer-devel-bounces@lists.freedesktop.org] on behalf of Ryan Talbot [rtalbot@vtti.vt.edu]<br> <b>Sent:</b> Friday, February 3, 2017 11:12 AM<br> <b>To:</b> gstreamer-devel@lists.freedesktop.org<br> <b>Subject:</b> Lossless end-to-end 16-bit grayscale compression?<br> </font><br> </div> <div></div> <div> <table id="msexchangesafetytips;843a11a5-872f-4a5a-dec9-08d44c52131e;T:en-US" style="border:0; display:table; width:100%; table-layout:fixed; border-collapse:seperate" width="100%" cellspacing="0" cellpadding="0" border="0" align="left"> <tbody> <tr> <td cellpadding="7px 2px 7px 2px" style="padding:7px 2px 7px 2px; background-color:#910A19" width="1px" valign="middle" bgcolor="#910A19"> </td> <td cellpadding="7px 5px 7px 15px" color="#212121" style="width:100%; background-color:#FDF2F4; padding:7px 5px 7px 15px; font-family:wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif; font-size:12px; font-weight:normal; color:#212121; text-align:left; word-wrap:break-word" width="100%" valign="middle" bgcolor="#FDF2F4"> This sender failed our fraud detection checks and may not be who they appear to be. Learn about <a href="http://aka.ms/LearnAboutSpoofing" target="_blank">spoofing</a></td> <td cellpadding="7px 5px 7px 5px" color="#212121" style="width:75px; background-color:#FDF2F4; padding:7px 5px 7px 5px; font-family:wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif; font-size:12px; font-weight:normal; color:#212121; text-align:left; word-wrap:break-word" width="75px" valign="middle" bgcolor="#FDF2F4" align="left"> <a href="http://aka.ms/SafetyTipsFeedback" target="_blank">Feedback</a></td> </tr> </tbody> </table> <div> <div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Hi list,<br> <br> I'm trying to losslessy compress the output of the disparity plugin. Its source caps say it outputs RGB, but the algorithm itself is supposed to generate 16-bit grayscale. After a lot of headache, I finally found a combo of avenc_ljpeg and avdec_mjpeg that would work to encode and then decode the RGB stream and get the exact same data on both ends. Now, I would like to do the same for a 16-bit grayscale stream of images, but am having little luck. avenc_mjpeg does support GRAY16_BE/LE, but I don't know how to make it lossless.<br> <br> Does such a solution exist, or do we need to roll our own/modify a codec?<br> <br> Thanks,<br> Ryan Talbot<br> </div> </div> </div> </div> </div> </body> </html>