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• where to save mpd file in raspberry pi so dash.js can access it remotely ?

  11 mai 2016, par Djm

  This is very high level question. I want to stream a live video from raspberry pi. I want to be able to watch live video in the browser remotely being streamed by the Raspberry pi.I want to use DASH stream protocol, and Dash.js as client to HTML5. I have looked through different tutorials but i am still puzzled about how this works.I understand that (assuming you have already prepared your videos with FFMPEG tool) from the client Dash.js
  you have to make a call/request and pass a url to your mpd file. My question is where would you save the file in raspberry pi especially if the Dash client is in a different web app(i want to make the call remotely) ?

• Extracting a clip from a video with low fps

  1er juin 2016, par superMind

  I want to extract a clip from a video( downloaded from [1]) (which has low frame rate) by specifying the start and end time. In order to do that, I use the following command :

  ffmpeg -i example.webm -ss 116.38 -to 126.38 clip.mpg

  however, I get the following error :

  ---

  ffmpeg version N-80026-g936751b Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
  
  libavutil 55. 24.100 / 55. 24.100
  
  libavcodec 57. 42.100 / 57. 42.100
  
  libavformat 57. 36.100 / 57. 36.100
  
  libavdevice 57. 0.101 / 57. 0.101
  
  libavfilter 6. 45.100 / 6. 45.100
  
  libavresample 3. 0. 0 / 3. 0. 0
  
  libswscale 4. 1.100 / 4. 1.100
  
  libswresample 2. 0.101 / 2. 0.101
  
  libpostproc 54. 0.100 / 54. 0.100
  
  Input #0, matroska,webm, from 'example.webm':
  
  Metadata:
  
  encoder : Google
  
  Duration: 00:04:22.29, start: 0.000000, bitrate: 207 kb/s
  
  Stream #0:0: Video: vp8, yuv420p, 630x360, SAR 1:1 DAR 7:4, 6 fps, 6 tbr, 1k tbn (default)
  
  Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)
  
  [mpeg1video @ 0x252f200] MPEG1/2 does not support 5/1 fps
  
  Output #0, mpeg, to 'clip.mpg':
  
  Metadata:
  
  encoder : Google
  
  Stream #0:0: Unknown: none, SAR 1:1 DAR 0:0 (default)
  
  Metadata:
  
  encoder : Lavc57.42.100 mpeg1video
  
  Stream #0:1: Unknown: none (default)
  
  Metadata:
  
  encoder : Lavc57.42.100 mp2
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (vp8 (native) -> mpeg1video (native))
  
  Stream #0:1 -> #0:1 (vorbis (native) -> mp2 (native))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  -----------------------------------------------------

  I tried by adding -r 20 to the above command. It works in this case but not sure this is correct way to do it.
  I was wondering how can I extract the clip from this video given start time and endtime ? what are parameters should I use ? or what is correct way to do it ?

  Thanks.

  [1]https://www.youtube.com/watch?v=Yc52pGHr0xc

• Android ndk ffmpeg : Unknown mnemonic error

  1er juin 2016, par Wasabi.Mayo

  I’m building a simple video app and want to embed a watermark on the recorded videos. I am using ffmpeg for this process and have successfully compiled it. The issue is when I try to link it with my project in Android Studio using ndk-build.cmd command, it gives me the following error :

  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s: Assembler messages:
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8547: Error: unknown mnemonic `itt' -- `itt gt'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8548: Error: unknown mnemonic `movgt' -- `movgt x25,x0'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8549: Error: unknown mnemonic `movgt' -- `movgt x0,x1'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8551: Error: unknown mnemonic `it' -- `it le'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8552: Error: unknown mnemonic `movle' -- `movle x0,x2'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8554: Error: unknown mnemonic `it' -- `it gt'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8555: Error: unknown mnemonic `movgt' -- `movgt x25,x0'
  
  make: *** [obj/local/arm64-v8a/objs/myProject_Videokit/ffmpeg.o] Error 1

  My development environment is

  • OS : Windows10 x86_64
  • Command line : Cygwin 64bit
  • Android NDK version : android-ndk-r11c
  • ffmpeg version : ffmpeg-3.0.2
  • Android Studio : 2.1.1

  First, I installed Cygwin64bit and added ’make’, ’dos2unix’, ’c++ gcc’ packages. And I decompressed ffmpeg folder in C :/android-ndk-r11c/sources. This is the build script I used.

  config.sh

  #!/bin/bash
  
  NDK=C:/android-ndk-r11c
  
  SYSROOT=$NDK/platforms/android-9/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64
  
  
  
  #I used cygpath to avoid path errors in Cygwin. 
  
  
  
  CUR="$(cygpath -m "$(pwd)")" 
  
  TEMPDIR="$(cygpath -m "/tmp")"
  
  TMP="$(cygpath -m "/tmp")"
  
  TMPDIR="$(cygpath -m "/tmp")"
  
  CPU=arm
  
  PREFIX=$CUR/android/$CPU 
  
  ADDI_CFLAGS="-marm"
  
  
  
  ./configure 
  
      --prefix=$PREFIX 
  
      --enable-shared 
  
      --disable-static 
  
      --disable-doc 
  
      --disable-ffmpeg 
  
      --disable-ffplay 
  
      --disable-ffprobe 
  
      --disable-ffserver 
  
      --disable-doc 
  
      --disable-symver 
  
      --enable-protocol=concat
  
      --enable-protocol=file
  
      --enable-muxer=mp4
  
      --enable-demuxer=mpegts
  
      --enable-memalign-hack
  
      --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- 
  
      --target-os=linux 
  
      --arch=arm 
  
      --enable-cross-compile 
  
      --sysroot=$SYSROOT 
  
      --extra-cflags="-Os -fpic $ADDI_CFLAGS" 
  
      --extra-ldflags="$ADDI_LDFLAGS" 
  
      $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install

  I ran this .sh in Cygwin(as administrator) but it didn’t work. So I typed each of those lines on Cygwin and it compiled successfully. I tried both --target-os=android and --target-os=linux, but both didn’t solve the problem above.

  Then I followed this tutorial (enoent.fr/blog/2014/06/20/compile-ffmpeg-for-android/). Based on that, I made a native method in my project and built header file and c file.(To do that, I followed this video. youtube.com/watch ?v=kFtxo7rr2HQ)

  After that, I cloned this repo(github.com/HikoQiu/JNI_INVOKE_FFMPEG) and copied - pasted the jni folder into my project. And after making the Android.mk and Application.mk, I ran the C :/android-ndk-r11c/ndk-build.cmd in the Android Studio terminal and it gave me the error above.

  These are the Makefiles I used.

  myProject/app/src/main/jni/Android.mk

  LOCAL_PATH := $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := com_example_project_Videokit
  
  LOCAL_LDLIBS := -llog -ljnigraphics -lz
  
  LOCAL_CFLAGS := -Wdeprecated-declarations
  
  ANDROID_LIB := -landroid
  
  LOCAL_C_INCLUDES := C:\android-ndk-r11c\sources\ffmpeg-3.0.2
  
  LOCAL_SRC_FILES := com_example_project_Videokit.c ffmpeg.c ffmpeg_filter.c ffmpeg_opt.c cmdutils.c
  
  LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil
  
  include $(BUILD_SHARED_LIBRARY)
  
  $(call import-module,ffmpeg-3.0.2/android/arm)

  myProject/app/src/main/jni/Application.mk

  APP_ABI := all

  C :/android-ndk-r11c/sources/ffmpeg-3.0.2/android/arm/Android.mk

  LOCAL_PATH:= $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavcodec
  
  LOCAL_SRC_FILES:= lib/libavcodec-57.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavformat
  
  LOCAL_SRC_FILES:= lib/libavformat-57.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libswscale
  
  LOCAL_SRC_FILES:= lib/libswscale-4.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavutil
  
  LOCAL_SRC_FILES:= lib/libavutil-55.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavfilter
  
  LOCAL_SRC_FILES:= lib/libavfilter-6.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libwsresample
  
  LOCAL_SRC_FILES:= lib/libswresample-2.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)

  And this is my project structure so far. com_example_myProjct.c is the file that I used as a moduleName in build.gradle file and as LOCAL_MODULE in Android.mk .

  app
  
   - build
  
   - libs
  
   - src
  
     - androidTest
  
     - main
  
       - java
  
          -com.example.myProject
  
            -MainActivity
  
            -Videokit   //this is the class where I called the native method.
  
       - jni
  
          -Android.mk
  
          -Application.mk
  
          -cmdutils.c
  
          -cmdutils.h
  
          -com_example_myProject.c
  
          -com_example_myProject.h
  
          -ffmpeg.c
  
          -ffmpeg.h
  
          -ffmpeg_filter.c
  
          -ffmpeg_opt.c
  
          -ffmpeg_opt.h
  
          -logjam.h
  
     - obj
  
     - res
  
     AndroidManifest.xml
  
   - test 

  app/gradle.build

  apply plugin: 'com.android.application'
  
  
  
  android {
  
      compileSdkVersion 23
  
      buildToolsVersion "23.0.2"
  
  
  
      defaultConfig {
  
          applicationId "com.example.myProjct"
  
          minSdkVersion 14
  
          targetSdkVersion 23
  
          versionCode 1
  
          versionName "1.0.0"
  
  
  
          ndk {
  
              moduleName "com_example_myProjet_Videokit"
  
          }
  
          sourceSets.main {
  
              jni.srcDirs = []
  
              jniLibs.srcDir 'src/main/libs'
  
          }
  
      }
  
  
  
      buildTypes {
  
          release {
  
              minifyEnabled false
  
              proguardFiles getDefaultProguardFile('proguard-rules.txt'), 'proguard-rules.pro'
  
          }
  
      }
  
  }
  
  
  
  dependencies {
  
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
      testCompile 'junit:junit:4.12'
  
      compile 'com.android.support:appcompat-v7:23.4.0'
  
  }

  Any ideas ?