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• GStreamer Tee (Multiple Multiplexer)

  14 novembre 2012, par user1595257

  I'm trying to store a video stream (coming from my webcam) into a MKV and FLV file. This means I have to split the video and audio pipeline after the h264 Encoding and mux each path with a different muxer.

  This is how I imagine it should be working :

                                               |->queue->matroskamux->filesink
  
  v4l2src->videorate->videoscale->x264enc->tee-|
  
                                               |->queue->flvmux->filesink

  Is this assumption correct ? Are all the queues at the right places ? How would a GStreamer command like this look like ? I'm having especially troubles with the concept of "Tees". How/where to start them in a command and how to manipulate different Tee-Paths. I looked up "Tee" in the GStreamer documentation but I'm still having troubles to apply them.

  Thanks in advance !

  EDIT : Ok, Thanks to mreithub I got it working for video. This is how the command looks like for now :

  gst-launch-0.10 -v -m v4l2src ! videorate ! videoscale ! ffmpegcolorspace ! x264enc ! tee name=muxtee ! queue2 ! matroskamux name=mkvmux ! filesink location=file1.mkv muxtee. ! queue ! flvmux name=flvmux ! filesink location=file1.flv

  Here is my attempt to get audio running :

  gst-launch-0.10 -v -m v4l2src ! videorate ! videoscale ! ffmpegcolorspace ! x264enc ! tee name=muxtee ! queue2 ! matroskamux name=mkvmux pulsesrc ! ffenc_aac ! filesink location=file1.mkv muxtee. ! queue ! flvmux name=flvmux pulsesrc ! ffenc_aac ! filesink location=file1.flv

  This does not work (command executes but immediately stops - no error message). But I'm also having trouble determining the position where to put the audio encoding. In my attempted solution I encode the audio in each Tee-Pipeline (right ?). But I'd like to encode audio only once and then just mux it in both pipeline-paths accordingly.

  Here's another try : after the audio encoding I split the pipleine using a Tee and assign it to the mkvmuxer and flvmuxer :

  gst-launch-0.10 -v -m v4l2src ! videorate ! videoscale ! ffmpegcolorspace ! x264enc ! tee name=muxtee ! queue2 ! matroskamux name=mkvmux ! filesink location=file1.mkv muxtee. ! queue ! flvmux name=flvmux ! filesink location=file1.flv pulsesrc ! ffenc_aac ! tee name=t2 ! queue ! mkvmux. t2. ! queue ! flvmux.

  But with this one I'm getting the following error message :

  could not link queue1 to flvmux

  Thanks !

• Restreaming video containing two languages live with ffmpeg

  9 novembre 2012, par user1810837

  I have a project where i need to restream a live stream which has two languages setup on the audio.
  Spanish on left and English on right

  The stream mapping is :

  Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv420p, 512x288 [SAR 1:1 DAR 16:9], q=2-31, 1k tbn, 1k tbc
  
  Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16, 18 kb/s

  I need to restream this back live with just the English from the right side or just spanish from the left side, I tried looking everywhere but did not find any type of solution .

  Since this needs to be done live, I can't be using other programs to separate video and audio to get it done.

  This needs to be done through ffmpeg and I wonder if it even capable of doing so with original built or it would need some custom modification.

• Use build_libstagefright in ffmpeg to build file .so for android

  21 décembre 2014, par OneGuilty

  In order to use ffmpeg in android , I tried to build ffmpeg by using build_libstagefright in

  ffmpeg/tools/lib_stagefright

  but it alwalys appear a error which i coundn’t solve it.

  the message in the bottom of ffmpeg/config.log is

  arm-linux-androideabi-g++ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -I../android-source/frameworks/base/include -I../android-source/system/core/include -I../android-source/frameworks/base/media/libstagefright -I../android-source/frameworks/base/include/media/stagefright/openmax -I/home/user/android-ndk/sources/cxx-stl/gnu-libstdc++/include -I/home/user/android-ndk/sources/cxx-stl/gnu-libstdc++/libs/armeY-›v7a/include -march=armv7-a -mfloat-abi=softfp -mfpu=neon -march=armv7-a -std=c99 -fomit-frame-pointer -fPIC -marm -Wno-multichar -fno-exceptions -fno-rtti -D__STDC_CONSTANT_MACROS -c -o /tmp/ffconf.6ZzEMs87.o /tmp/ffconf.5jbfvJxK.cpp

  ./configure : line 701 : /home/user/android-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-g++ : cannot execute binary file

  ERROR : libstagefright_h264 not found

  Anyone have the solution of this ??

  my Build Environment is

  1. Window 7
  2. Cygwin
  3. android-NDK-r8b linux version