android ndk - app crashed at avformat_find_stream_info -


i write native method codec id of video, app never pass line 'avformat_find_stream_info(pformatctx, null)' here native method:

int get_video_info(jnienv *env, jobject thiz, jstring strinfile){ avformatcontext *pfmtctx; avcodeccontext *pcctx; avcodec *pcd; avframe *picture; int i, videostream = -1, error = 0;  const char *in_file_name = (*env)->getstringutfchars(env, strinfile, null);  av_register_all();  logi(1, "here 0 %s", in_file_name); // app passed here  /*open video file*/ pfmtctx = avformat_alloc_context(); if((error=avformat_open_input(&pfmtctx, in_file_name, null, null)) < 0){     loge(1, "couldn't open file, error-code: %d file url: %s", error, in_file_name);     return -1; }  logi(1, "here 1 duration: %d", pfmtctx->duration); //app passed here  /*retrieve stream information, app crash right here*/ if(avformat_find_stream_info(pformatctx, null)<0){     loge(1, "couldn't retrieve stream information");     avformat_free_context(pfmtctx);     return -1; // couldn’t find stream information }  logi(1, "here 2");  //find first video stream videostream=-1; for(i=0; i<pformatctx->nb_streams; i++) {     if(pformatctx->streams[i]->codec->codec_type==avmedia_type_video){         videostream=i;         break;     } }  if(videostream==-1){     avformat_free_context(pfmtctx);     loge(1, "didn't find video stream");     return -1; // didn’t find video stream }  // pointer codec context video stream pcctx=pformatctx->streams[videostream]->codec;  avformat_free_context(pfmtctx); (*env)->releasestringutfchars(env, strinfile, in_file_name); return pcctx->codec_id; }

question: why fail finding stream info this? please me fix it. thanks

you using pformatctx (which not initialized) instead of pfmtctx in several places in code!

you set pformatctx = pfmtctx after avformat_alloc_context():


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