Recherche avancée

Sur d’autres sites (3724)

• Stream video from mobile camera to ffmpeg with NDK

  19 juillet 2013, par user2598307

  I need to create an application that captures video from a camera phone and send it to ffmpeg. Everything should be done only NDK level without SDK and Java
   The phone can be Root

  I am trying to open camera on my android device with this function "avformat_open_input()". I give this function a reference to device folder "/dev/msm_camera/" or "/dev/video0".

  I try like this :

        void Java_com_example_camera_MainActivity_testVideo(JNIEnv *env, jclass jc, jstring *filename)
  
  {
  
          av_register_all();
  
          avcodec_register_all();
  
          avformat_network_init();
  
          AVFormatContext* context = avformat_alloc_context();
  
          int video_stream_index,ret,i;
  
          AVInputFormat *input_format = NULL;
  
          const char formatName[] = "mpeg"; //for example mpeg
  
          const jbyte *str;
  
          str = (*env)->GetStringUTFChars(env, filename, NULL); //filename = "/dev/msm_camera"
  
          input_format = av_find_input_format(formatName);
  
          ret = avformat_open_input(&context, str, input_format, NULL);
  
          if (ret < 0){
  
             LOGE("Not open");
  
          }else{
  
             LOGI("camera was open");
  
          }
  
          if(avformat_find_stream_info(context,NULL) < 0){
  
             LOGE("No stream");
  
          }
  
          for(i =0;inb_streams;i++){
  
             if(context->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
  
                 video_stream_index = i;
  
          }
  
          AVPacket packet;
  
          AVFrame *pFrame;
  
          av_init_packet(&packet);
  
          pFrame = avcodec_alloc_frame();
  
  
  
                  //open output file
  
          AVOutputFormat* fmt = av_guess_format("avi", NULL, NULL);
  
          AVFormatContext* outputContext = avformat_alloc_context();
  
          outputContext->oformat = fmt;
  
          avio_open2(&outputContext->pb, "/sdcard/test.avi", AVIO_FLAG_WRITE,NULL,NULL);
  
          AVStream* stream=NULL;
  
          AVFrame * frame;
  
          frame = avcodec_alloc_frame();
  
          int cnt = 0, frameDecoded;
  
  
  
                  //start reading packets from stream and write them to file
  
          av_read_play(context);
  
          while(av_read_frame(context,&packet)>=0 && cnt <300){ //Here function return -1
  
            if(packet.stream_index == video_stream_index)
  
            {//packet is video
  
              if(stream == NULL){
  
                 //create stream in file
  
                       stream = avformat_new_stream(outputContext,context->streams[video_stream_index]->codec->codec);
  
                       avcodec_copy_context(stream->codec,context->streams[video_stream_index]->codec);
  
                       stream->sample_aspect_ratio = context->streams[video_stream_index]->codec->sample_aspect_ratio;
  
                       avformat_write_header(outputContext,NULL);
  
               }
  
               packet.stream_index = stream->id;
  
               av_write_frame(outputContext,&packet);
  
               cnt++;
  
             }
  
             av_free_packet(&packet);
  
             av_init_packet(&packet);
  
          }
  
          av_read_pause(context);
  
          av_write_trailer(outputContext);
  
          avio_close(outputContext->pb);
  
          avformat_free_context(outputContext);         
  
   }

  As I know, we cannot get access to camera because my program has not root permission. So how I can give my program root permission ? Or how I can go around this problem ?

  I also tried to interact with the device driver using ioctl commands on C\C++, but I did not succeed because I have no experience and examples in Google.

  Thank you !!!

• Can't display live streaming video from mobile to wowza streaming software

  11 février 2016, par Muthukumar S

  You have to record frame are convert to video.mp4 files. i need rtmp url live streaming videos in mp4 format. but i work in java CV 1.1 . the mp4 and flv video is working. and it can’t display(any video format) in wowza streaming engine software. thanks.

• Nomenclature #4626 : Renommer le menu "Squelettes"

  30 avril 2021, par RastaPopoulos ♥

  Au départ c’était censé être une 3.3 donc faible changement.

  Finalement on est sur une 4.0 où on annonce de gros changements dont plein de choses dans l’admin.

  Je pense donc que c’est parfaitement l’occasion de faire ce changement pour cette entrée. Et que donc la nouvelle version soit plus compréhensible par plus de monde directement.