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POav_read_frame function in ffmpeg in android always returning packet.stream_index as 0
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15727410
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2013-03-31T07:37:28.887
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2013-07-31T00:27:31.237
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<p>I am using the following standard code pasted below (ref: <a href="http://dranger.com/ffmpeg/" rel="nofollow">http://dranger.com/ffmpeg/</a>) to use ffmpeg in android using ndk. My code is working fine in ubuntu 10.04 using gcc compiler. But I am facing an issue in android.The issue is <code>av_read_frame(pFormatCtx, &packet)</code> is always returning <code>packet.stream_index=0</code>. I have tested my code with various rtsp urls and I have the same behaviour in all cases. I do not have any linking or compiling issues as everything seems to be working fine except this issue. I am trying to solve this from last 2 days but I am stuck badly.Please point me in right direction.</p> <pre><code>#include <jni.h> #include <android/log.h> #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libswscale/swscale.h> #include <stdio.h> #define DEBUG_TAG "mydebug_ndk" jint Java_com_example_tut2_MainActivity_myfunc(JNIEnv * env, jobject this,jstring myjurl) { AVFormatContext *pFormatCtx = NULL; int i, videoStream; AVCodecContext *pCodecCtx = NULL; AVCodec *pCodec = NULL; AVFrame *pFrame = NULL; AVPacket packet; int frameFinished; AVDictionary *optionsDict = NULL; struct SwsContext *sws_ctx = NULL; jboolean isCopy; const char * mycurl = (*env)->GetStringUTFChars(env, myjurl, &isCopy); __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:p2: [%s]", mycurl); // Register all formats and codecs av_register_all(); avformat_network_init(); // Open video file __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:before_open"); if(avformat_open_input(&pFormatCtx, mycurl, NULL, NULL)!=0) return -1; __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "start: %d\t%d\n",pFormatCtx->raw_packet_buffer_remaining_size,pFormatCtx->max_index_size); (*env)->ReleaseStringUTFChars(env, myjurl, mycurl); __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:before_stream"); // Retrieve stream information if(avformat_find_stream_info(pFormatCtx, NULL)<0) return -1; __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:after_stream"); // Find the 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) return -1; // Didn't find a video stream __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:after_videostream"); // Get a pointer to the codec context for the video stream pCodecCtx=pFormatCtx->streams[videoStream]->codec; __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:after_codec_context"); // Find the decoder for the video stream pCodec=avcodec_find_decoder(pCodecCtx->codec_id); __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:after_decoder"); if(pCodec==NULL) return -1; __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:found_decoder"); // Open codec if(avcodec_open2(pCodecCtx, pCodec, &optionsDict)<0) return -1; // Allocate video frame pFrame=avcodec_alloc_frame(); sws_ctx = sws_getContext(pCodecCtx->width,pCodecCtx->height,pCodecCtx->pix_fmt,pCodecCtx->width, pCodecCtx->height,PIX_FMT_YUV420P,SWS_BILINEAR,NULL,NULL,NULL); __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:before_while"); int count=0; while(av_read_frame(pFormatCtx, &packet)>=0) { __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "entered while: %d %d %d\n", packet.duration,packet.stream_index,packet.size); if(packet.stream_index==videoStream) { // Decode video frame //break; avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,&packet); __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:in_while"); if(frameFinished) { __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:gng_out_of_while"); break; } } // Free the packet that was allocated by av_read_frame av_free_packet(&packet); if(++count>1000) return -2; //infinite while loop } __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:after_while"); // Free the YUV frame av_free(pFrame); // Close the codec avcodec_close(pCodecCtx); // Close the video file avformat_close_input(&pFormatCtx); return 0; } </code></pre>
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<android><android-ndk><ffmpeg><libavformat>
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av_read_frame function in ffmpeg in android always returning packet.stream_index as 0
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1. COI have same problam too. Hopes someone can help us. :(
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