<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> </head> <body> <style type="text/css" style="display:none;"></style> <div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif;" dir="ltr"> Hello, Try to look on probe. You can drop from stream. Mikl </div> <hr style="display:inline-block;width:98%" tabindex="-1"> <div id="divRplyFwdMsg" dir="ltr">From: gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on behalf of justyoung17 <george.chiao@hotmail.co.uk> Sent: Sunday, February 5, 2017 8:51:05 PM To: gstreamer-devel@lists.freedesktop.org Subject: Manipulate data between omxmjpegdec and omxh264enc with a fifo on PI 3? <div> </div> </div> <div>Hi, Not sure if it makes sense about what I tried to do, for example, below worked fine as I was able to pipe in jmpeg from the IP camera on raspi3 to an external rtmp channel: ffmpeg -i "rtsp://xxxx" -vcodec copy -f mjpeg -y - | \ gst-launch-1.0 \ -v fdsrc fd=0 \ ! "image/jpeg,width=1280, height=720,framerate=25/1" \ ! jpegparse \ ! omxmjpegdec \ ! omxh264enc \ ! h264parse \ ! queue \ ! flvmux streamable=true \ ! queue \ ! rtmpsink location="rtmp://yyyy" However, when I placed a fifo between omxmjpegdec and omxh264enc For example Session 1: mkfifo ffmpeg \ -i "rtsp://xxxx" -vcodec copy -f mjpeg -y - | \ gst-launch-1.0 \ -v fdsrc fd=0 \ ! "image/jpeg,width=1280, height=720,framerate=25/1" \ ! jpegparse \ ! omxmjpegdec \ ! filesink location=myfifo And Session 2: tail -F myfifo | gst-launch-1.0 \ -v fdsrc \ ! omxh264enc \ ! h264parse \ ! queue \ ! flvmux streamable=true \ ! queue \ ! rtmpsink location="rtmp://yyyy" Session 2 hung on 'Pipeline is PREROLLING...'. I could see session 1 worked fine as it did keep feeding data to the fifo. I am guessing maybe in session 2 I need to provide perhaps some sort of data format before it gets chaining into omxh264enc; I inserted "video/x-raw,width=1280, height=720,framerate=25/1" but no luck. Reason for placing a fifo is basically a trial to see whether I could manipulate the data before piping into omxh264enc, and I am stuck already in first step with fifo so perhaps such approach isn't going to work and I just wanted to know so I can start looking around other approach. Many thanks and hope someone could help here. <hr align="left" width="300"> View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Manipulate-data-between-omxmjpegdec-and-omxh264enc-with-a-fifo-on-PI-3-tp4681735.html"> Manipulate data between omxmjpegdec and omxh264enc with a fifo on PI 3?</a> Sent from the <a href="http://gstreamer-devel.966125.n4.nabble.com/">GStreamer-devel mailing list archive</a> at Nabble.com. </div> </body> </html>