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• ffmpeg - scaling and stacking 2 videos ?

  25 mai 2016, par Gambit2007

  I have 2 inputs and i want to scale, crop and put them on top of each other at the same time. My command should look something like this :

  ffmpeg -i input1 -i input2 -filter_complex crop=10000:5000:1000:0,scale=3840:1536 vstack output.mp4

  I know i need to use chaining (?) but i tried to look it up online and couldn’t really get it to work.

  So what would be the correct syntax the scale and crop both inputs and then put them vertically on top of each other while using ’-filter_complex’ only once ?

  Thanks !

• Anomalie #3607 : Problème de compatibilité avec mysql 5.7 pour SPIP 3.1

  26 avril 2016, par Guillaume Fahrner

  Le format est correct, la valeur ne convient par contre pas. La changer parait suffisant :

  https://github.com/concrete5/concrete5/issues/3185 :

  The DATETIME type is used for values that contain both date and time parts. MySQL retrieves and displays DATETIME values in ’YYYY-MM-DD HH:MM:SS’ format. The supported range is ’1000-01-01 00:00:00’ to ’9999-12-31 23:59:59’.

  Per http://dev.mysql.com/doc/refman/5.7/en/datetime.html

• av_read_frame function in ffmpeg in android always returning packet.stream_index as 0

  31 juillet 2013, par droidmad

  I am using the following standard code pasted below (ref : http://dranger.com/ffmpeg/) 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 av_read_frame(pFormatCtx, &packet) is always returning packet.stream_index=0. 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.

  #include 
  
  #include <android></android>log.h>
  
  
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  #include 
  
  #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, &amp;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(&amp;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)&lt;0)
  
        return -1;
  
    __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK:after_stream");
  
    // Find the first video stream
  
    videoStream=-1;
  
    for(i=0; inb_streams; i++)
  
        if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
  
          videoStream=i;
  
          break;
  
        }
  
    if(videoStream==-1)
  
        return -1; // Didn&#39;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, &amp;optionsDict)&lt;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, &amp;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, &amp;frameFinished,&amp;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(&amp;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(&amp;pFormatCtx);
  
  
  
    return 0;
  
  
  
  }