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• Building gstreamer_ndk_bundle problems

  - by Cipi

  I'm trying to build gstreamer_ndk_bundle under Ubuntu 12.4 and I'm failing miserably! I have installed all "glib-dev" packages (packages that in their name have glib and dev), and also I have tried to compile/install glib 2.33.1 (latest) from source, but I always get this error: /home/marko/gstreamer_ndk_bundle/jni/../glib/gobject/gmarshal.c:149: undefined reference to `g_value_get_schar' collect2: ld returned 1 exit status make: *** [/home/marko/gstreamer_ndk_bundle/obj/local/armeabi/libgobject-2.0.so] Error 1 This means that glib source doesn't have the definition for g_value_get_schar, and since that function was introduced in glib somewhere after version 2.30.0, my guess is that I am not using proper glib! I tried to force gstremaer_ndk_bundle to build with sources from the folder /home/marko/glib-2.33.1/ which I compiled/installed by exporting these env vars: GLIB_GENMARSHAL=/home/marko/glib-2.33.1/gobject/glib-genmarshal GLIB_COMPILE_SCHEMAS=/home/marko/glib-2.33.1/gio/glib-compile-schemas Also I changed gmarshal.h so it includes gmarshal.h from the installed glib folder: #ifndef _marko_glib_loaded #define _marko_glib_loaded #include "/home/marko/glib-2.33.1/gobject/gmarshal.h" #endif But failed in both cases. How can I know what glib is used while compiling gstreamer and install the proper one? How can I force gstreamer_ndk_bundle to use glib sources from the folder I have un-tared/configured/installed and not the system ones, or whatever ones it uses? I read somewhere that I need gstreamer-devel package if I keep getting this error while compiling. Where can I find that package?! Can't Google it out... Has anyone EVER built gstreamer_ndk_bundle and lived to tell the tale?

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• Detect MPEG4/H264 I-Frame (IDR) in RTP stream

  - by Cipi

  I need to detect MPEG4 I-Frame in RTP packet. I know how to remove RTP header and get the MPEG4 frame in it, but I cant figure out how to identify the I-Frame. Does it have a specific signature/header?

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• How to decode sprop-parameter-sets in a H264 SDP?

  - by Cipi

  What is the meaning of Base64 decoded bytes in sprop-parameter-sets in SDP for a h264 stream? How can I know the video size from this example? SDP example: sprop-parameter-sets=Z0IAKeNQFAe2AtwEBAaQeJEV,aM48gA== First part decoded from Base64 to Base16: 67 42 00 29 E3 50 14 07 B6 02 DC 04 04 06 90 78 91 15 Second part (comma separated): 68 CE 3C 80

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• How to force client to switch RTP transport from UDP to TCP?

  - by Cipi

  If the client wants to watch a stream that is on my RTSP server, it first tries to setup a stream through the UDP protocol. How can I tell it that my server only supports RTP/AVP/TCP and that it should switch transports? I want to terminate the UDP support on my server, but all the clients first try to SETUP the session over UDP, and later they do so over TCP... and I want to switch them to TCP as soon as possible in RTSP protocol. How can I do that?

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• How to seek to a specific time in a RTP stream?

  - by Cipi

  I am streaming a prerecorded H264 video that has the following structure: [I] [x] [x] [x] [I] [x] [x] [x] [I]... In between the IDR (I-s in my structure) I have 32 (only 3 presented here) other frames (all other stuff that is not IDR like SEI, SPS, PPS... X-es) Now, let assume that the timing of my frames is such: TIME: 1 2 3 4 5 6 7 8 9 FRAME: [I] [x] [x] [x] [I] [x] [x] [x] [I]... Now i want to seek to the time 4. If I seek to that frame, and send it, the picture gets messed up because the decoder needs a IDR to decode it properly, so I resorted to finding the appropriate IDR (in this case one with the time 1) and sending it as the frame with the time 4. So now the picture is decoded properly, all is well... but... If my GOV is 32, and I need to send the non IDR frame that has the index 31, and if the time span between it and the corresponding IDR is 3 seconds, I actually get 3 seconds earlier then the time I want. Now, this is not precise, because I cannot seek to the half of the GOV time span. Also, I cant set smaller GOV, so I want other ideas... My other idea was to send the last known IDR, and then send all other non IDR frames that come before the one I want, only I would set for all of them RTP-TIME to be the same as the corresponding IDR. In this case the picture gets decoded perfectly, but now in the above case, 3 seconds that follow non IDR frame with the wanted time get fast paced in the decoder/player (there is no instantaneous seek)... Any ideas? Or I can only seek to IDR-s and not the frames in between?

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