<html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> Il 29/11/2011 16:07, Nezer Zaidenberg ha scritto: <blockquote cite="mid:CAFHPcenVxix8W85AKN3UYsWEdBE-Q7EiBu1+hi_tzdhoLiG9Uw@mail.gmail.com" type="cite"> <div dir="ltr"><span style="border-collapse: collapse; font-family: arial,sans-serif; font-size: 13px;">Hi Nicola, <div><br> </div> <div>Thanks, but I have read somewhere that I am better off using pad-block or appsrc/sink (as you mentioned) since I want to connect two pipelines in the same process.</div> <div>(as a side note, I used gdp[de]pay successfully to implement what I wanted).</div> <div><br> </div> <div>I have considered using the pad-block - but it is too complicated and it is underdocumented. For instance jokosher used pad-block not knowing that it needs buffers to have the signal flushed and they only found it out by a mail in the mailing list.</div> <div><br> </div> <div>Also, I don't want to stop the whole pipeline to finalize every one-minute recording - when I try to send an eos to a regular recording, it usually takes a couple of seconds for it to finalize - and I don't want the user to experience this video freeze.</div> <div><br> </div> <div>I would like your opinion about something else (sorry if I am being too bold) - appsink and appsrc are very general (good) ideas.</div> </span></div> </blockquote> <br> in an app of mine I'm using something like this:<br> <br> source -> <some other elements> -> appsink<br> <br> appsrc -> <some other elements> filesink<br> <br> when I stop the second pipeline and change the filesink location I put the buffer from appsink in a gst_atomic_queue, and when the second pipeline is ready again I empty the queue.<br> <br> I think this is considered an hack too, however works fine for me and I have all in the same app,<br> <br> Nicola<br> <br> <blockquote cite="mid:CAFHPcenVxix8W85AKN3UYsWEdBE-Q7EiBu1+hi_tzdhoLiG9Uw@mail.gmail.com" type="cite"> <div dir="ltr"><span style="border-collapse:collapse;font-family:arial,sans-serif;font-size:13px"> <div>But what I am really looking for is a way to create a global queue - and have one pipeline filling it and another (or others) emptying it.</div> <div>What I imagine (actually what I plan to implement) is a "queuesink" that just queues the buffers it gets in a global queue, and a "queuesrc" that takes a global queue and drains it.</div> <div>This would also fit well with all the other pipeline communication ways like shm{sink,src}, tcp{client,server}{sink,src}, udp{src,sink}, and even file{src,sink} that use a pipe.</div> <div><br> </div> <div>Now appsink and appsrc involve a lot of hacking to achieve this (attaching signal handlers and removing them when a pipeline is destroyed in a synchronized way) relatively, just to have simple handlers that only save the buffers in a queue - a concept which plays a central role in gstreamer already - and thus has a strong stable implementation already.</div> <div><br> </div> <div>I feel that this simple idea will not gain much by using the full power of the app{sink,src}, and would rather use an element that does this job itself.</div> <div><br> </div> <div>Is there any element today in gstreamer that does this?</div> <div>If not, and if I implement such an element, do you have any advice/remarks?</div> <div><br> </div> <div>Thanks,</div> <div> Tomer</div> </span> <div class="gmail_quote"><br> </div> <div class="gmail_quote">On Mon, Nov 28, 2011 at 4:23 PM, Mailing List SVR <span dir="ltr"><<a moz-do-not-send="true" href="mailto:lists@svrinformatica.it" target="_blank">lists@svrinformatica.it</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div bgcolor="#FFFFFF" text="#000000"> Il 28/11/2011 12:34, Nezer Zaidenberg ha scritto: <div> <div> <blockquote type="cite"> <div dir="ltr">Hi All, <div><br> </div> <div>I have a live source (webcam) that I want to record continuously without losing any video - but also be able to playback everything up to the last minute. I am trying to dump the video to a fifo and then record it from the fifo one minute at a time.</div> <div><br> </div> <div>The problem is that it seems there is a problem with the timestamps. It looks like gstreamer expects a clock to be supplied by the filesrc but that doesn't happen. </div> <div>Specifically when I try to play the pipe instead of record it, I get choppy video and a warning is emitted about the timestamps.</div> <div><br> </div> <div>Does anyone know how I could record an mpeg stream from a fifo?</div> <div><br> </div> <div>For reference, here are the pipelines:</div> <div>source pipe:</div> <div>gst-launch rtspsrc location="<webcam>" ! rtpmp4vdepay ! filesink location=pipe</div> <div><br> </div> <div>record pipe:</div> <div>gst-launch filesrc location=pipe ! 'video/mpeg, mpegversion=4, systemstream=false, width=320, height=240. framerate=(fraction)30/1, codec_data=...' ! matroskamux ! filesink location="1.mkv"</div> <div><br> </div> <div>play pipe:</div> <div>gst-launch filesrc location=pipe ! 'video/mpeg, mpegversion=4, systemstream=false, width=320, height=240. framerate=(fraction)30/1, codec_data=...' ! ffdec_mpeg4 ! ffmpegcolorspace ! autovideosink</div> </div> </blockquote> <br> </div> </div> try to add do-timestamp=true to the filesrc element (or sync=false to the videosink), however gstreamer allow to record and play with only 1 pipeline, no need for this hack:<br> <br> <a moz-do-not-send="true" href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-plugins/html/gstreamer-plugins-tee.html" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-plugins/html/gstreamer-plugins-tee.html</a><br> <a moz-do-not-send="true" href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gstreamer-app.html" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gstreamer-app.html</a><br> <br> Nicola<br> <br> <blockquote type="cite"> <div dir="ltr"> <div><br> </div> <div>Thanks,</div> <div> Tomer & Nezer</div> <div><br> </div> <div><br> </div> </div> <br> <fieldset></fieldset> <br> <pre>_______________________________________________ gstreamer-devel mailing list <a moz-do-not-send="true" href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank">gstreamer-devel@lists.freedesktop.org</a> <a moz-do-not-send="true" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </pre> </blockquote> <br> </div> <br> _______________________________________________<br> gstreamer-devel mailing list<br> <a moz-do-not-send="true" href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank">gstreamer-devel@lists.freedesktop.org</a><br> <a moz-do-not-send="true" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a><br> <br> </blockquote> </div> <br> </div> <br> <fieldset class="mimeAttachmentHeader"></fieldset> <br> <pre wrap="">_______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </pre> </blockquote> <br> </body> </html>