<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> On 02/05/2013 04:16 PM, Tim-Philipp Müller wrote: <blockquote cite="mid:1360077409.4159.4.camel@zingle" type="cite"> <blockquote type="cite"> <pre wrap="">I need to create a program that allows me to extract a statistic about the packets of an H.264 received video. Particularly, I would like to count the total NAL units received and the number of the units that were corrupted and that were therefore not decoded. I'd like to know if it possibile to do it with gstreamer. I don't need to play the video, I just need a simple output that for each NAL unit signals whether it was correctly decoded or not, so that I could execute the program with a pipe from another program and evaluate all the statistics that I need. Do you think it is possibile to do it? Can you please help me make it? </pre> </blockquote> <pre wrap=""> I think you would want/need decoder support for what you want to do. You could probably detect whole frames that don't get decoded at all, but not if individual NALs or slices weren't decoded correctly and you still get a frame with some artefacts. </pre> </blockquote> Ok, but I'd like to know is there a way to achieve that or something similar with gstreamer. I am thinking about something like <pre><code>gst-launch rtspsrc location=<a class="moz-txt-link-freetext" href="rtsp://192.168.0.20/live1.sdp">rtsp://192.168.0.20/live1.sdp</a> ! </code><code>rtph264depay ! </code><code>h264parse </code></pre> <code></code>but I don't know how to finish the command to be able to get information about what had a correct syntax. If you're wondering why I am interested in NAL units and not frames or bit-error rate, it is because I am trying to characterize a device that I do not control and I'd like to have measure that is not falsed by the GOP size. Streaming only I frames reduces the propagation error, but I would like to have a measure that can be independent of this kind of "tricks". Thank you in advance if you can help me, Ottavio <code></code> </body> </html>