Recherche avancée

Sur d’autres sites (6764)

• Troll spirit

  15 juin 2013, par Mans — Law and liberty

  Last week’s announcements from the White House of steps being taken to begin fighting back against patent trolls, along with legislation passed in Vermont for the same purpose, are worthy of praise. Whether they prove effective or not, they are a sign of the problem finally having been recognised by … Continue reading →

• Can multiple instances of ffmpeg share the same input sdp file - live transcoding h264

  27 avril 2018, par mikeyb976

  I have a ffmpeg encoder producing a h264/rtp video stream at 1080p resolution. I also use the ffmpeg to generate the sdp file that describes this stream.

  While the encoder is running, I have a live transcoder also using ffmpeg, that takes in the sdp file as input, and produces rtsp output stream at lower resolution 720p.

  My question is,

  If I want to later transcode this rtp 1080p stream to 360p, Can I spin up a new ffmpeg instance and perform the conversion OR will the ffmpeg instance that is transcoding to 720p, lock out access to the original rtp stream ??

  I do know I can have one ffmpeg instance that takes in the sdp file as input and produce multiple outputs, but that means I have to create my outstreams at lower resolutions all in one go regardless if the client consumer wants that resolution

  Any help would be great, thanks

• While working with ffmpeg : Created function in C file and after compilation with NDK accessing from android activity, getting signal 11 error

  30 mai 2016, par Dayanand Lande

  After successfully fire command ndk-build I got .so file in my libs folder, then after some changes in gradle file I got native_libs.xml .idea/libraries folder.

  Now I am accessing c function from my java code/ android activity. I am getting signal 11 error

  My code is

  C file

  #include 
  
  #include <android></android>log.h>
  
  #include 
  
  
  
  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  
  
  #define LOG_TAG "mylib"
  
  #define LOGI(...)  __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
  
  #define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
  
  
  
  
  
  //JNIEXPORT jint JNICALL Java_com_xxx_xxx_activities_SplashActivity_logFileInfo(JNIEnv * env, jobject this, jstring filename);
  
  
  
  jint Java_com_xxx_xxx_activities_TutorialsActivity_logFileInfo(JNIEnv * env, jobject this, jstring filename)
  
  {
  
      av_register_all();
  
  
  
      AVFormatContext *pFormatCtx;
  
      const jbyte *str;
  
      str = (*env)->GetStringUTFChars(env, filename, NULL);
  
  
  
      if(avformat_open_input(&amp;pFormatCtx, str, NULL, NULL)!=0)
  
      {
  
          LOGE("Can't open file '%s'\n", str);
  
          return 1;
  
      }
  
      else
  
      {
  
          LOGI("File was opened\n");
  
          LOGI("File '%s', Codec %s",
  
              pFormatCtx->filename,
  
              pFormatCtx->iformat->name
  
          );
  
      }
  
      return 0;
  
  }

  Loading and try to access method in java code is

  private static native int logFileInfo(String filename);
  
  
  
  
  
      static {
  
          System.loadLibrary("framegrabber");
  
      }

  In OnCreate of activity

  logFileInfo(file.getAbsolutePath());

  Finally error at point logFileInfo(file.getAbsolutePath()); is

  A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x106e in tid 8905 (Thread-20972)

  Please replay if you have any solution, Thanking in advance.