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• av_read_frame() in ffmpeg returns -5 while receiving UDP data [closed]

  26 février 2024, par zttang

  I'm working on an app which is using ffmpeg lib. There is a living source keep sending TS stream thru udp. Then I allocated a thread use ffmpeg receive the TS packets. the code for this thread is like :

  


  void* av_source_thread(void *data) {
    char udp_url[50];
    snprintf(udp_url, sizeof(udp_url), "udp://127.0.0.1:12345");
    AVDictionary* options = NULL;
    av_dict_set(&options, "timeout", "500000", 0);  // timeout=0.5s
    av_dict_set(&options, "overrun_nonfatal", "1", 0);
    av_dict_set(&options, "fifo_size", "278876", 0);  //50MB

    AVFormatContext *ffmpeg_source = avformat_alloc_context();
    while (running) {
        if (avformat_open_input(&ffmpeg_source, udp_url, NULL, &options) != 0) {
            continue;
        } else {
            break;
        }
    }
    // Some code fill codec type and alloc context here

    av_format_inject_global_side_data(ffmpeg_source);
    AVPacket *packet = av_packet_alloc();
    while (running) {
        ret = av_read_frame(ffmpeg_source, packet);
        if (ret < 0) {
            char errbuf[AV_ERROR_MAX_STRING_SIZE];
            av_strerror(ret, errbuf, AV_ERROR_MAX_STRING_SIZE);
            usleep(10000);
            log("av_read_frame failed, Exit, %s, %d", errbuf, ret);
            continue;
        }
        putPkt2Q(packet);  
    }
    av_packet_free(&packet);
    avformat_close_input(&ffmpeg_source);
    av_dict_free(&options);
    return nullptr;
}


  


  Then the packets will be sent to Q and other thread will process them. but when I run the program, the av_read_frame will return -5(I/O error) from time to time. and once it returned -5, it can not recover unless I restart this thread.

  


  since this is a real time source, so lost some frames are acceptable, I just want to know how to avoid this kind of issue or how to recover without restart the whole thread. I tried to increase the fifo_size in options, but it does not work.

  


• avcodec_open2 returns -22 "Invalid argument" trying to encode AV_CODEC_ID_H264

  26 mai 2023, par Fries of Doom

  I'm trying to use libavcodec to encode h264 video but avcodec_open2 returns -22 "Invalid argument" and I can't figure out why. Here is my code, which is mostly a copy from the encode example from libavcodec.

  


      /* find the mpeg1video encoder */
    const AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_H264);
    if (!codec) {
        fprintf(stderr, "Codec '%s' not found\n", "h.264");
        exit(1);
    }

    AVCodecContext* codecContext = avcodec_alloc_context3(codec);
    if (!codecContext) {
        fprintf(stderr, "Could not allocate video codec context\n");
        exit(1);
    }

    AVPacket* pkt = av_packet_alloc();
    if (!pkt)
        exit(1);

    /* put sample parameters */
    codecContext->bit_rate = 400000;
    /* resolution must be a multiple of two */
    codecContext->width = 1920;
    codecContext->height = 1080;
    /* frames per second */
    codecContext->time_base = { 1, 25 };
    codecContext->framerate = { 25, 1 };

    /* emit one intra frame every ten frames
     * check frame pict_type before passing frame
     * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
     * then gop_size is ignored and the output of encoder
     * will always be I frame irrespective to gop_size
     */
    codecContext->gop_size = 10;
    codecContext->max_b_frames = 1;
    codecContext->codec_type = AVMEDIA_TYPE_VIDEO;
    codecContext->pix_fmt = AV_PIX_FMT_YUV420P;

    if (codec->id == AV_CODEC_ID_H264)
        av_opt_set(codecContext->priv_data, "profile", "baseline", 0);

    /* open it */
    int ret = avcodec_open2(codecContext, codec, nullptr);
    if (ret < 0) {
        char eb[AV_ERROR_MAX_STRING_SIZE];
        fprintf(stderr, "Could not open codec: %s\n", av_make_error_string(eb, AV_ERROR_MAX_STRING_SIZE, ret));
        exit(1);
    }


  


  Does anyone know what I'm doing wrong ?

  


• AVCodecContex returns zero for width and height in android

  17 février 2023, par Whoami

  Not sure what was my mistake in the below code. I m trying with ffmpeg 0.11 and SDL2.0 in android.

  



  QUESTION :
Why Width and Height of the CodecContext gives me always zero ?..

  



  int main(int argc, char *argv[])&#xA;{&#xA;&#xA;    int flags;&#xA;    flags = SDL_INIT_VIDEO | SDL_INIT_TIMER;&#xA;&#xA;    if (SDL_Init (flags)) {&#xA;        LOGD ("Could not intialize Video for SDL: %s \n", SDL_GetError());&#xA;    }&#xA;    else &#xA;        LOGD (" SUCCESS: SDL_Init ");&#xA;&#xA;    // ffmpeg Register all services..&#xA;    ffmpeg_register_all (); &#xA;&#xA;&#xA;    pFrame = avcodec_alloc_frame ();&#xA;    context = avformat_alloc_context();&#xA;&#xA;    err = avformat_open_input (&amp;context, "rtsp:ip:port", NULL, NULL);&#xA;    if ( err &lt; 0) {&#xA;        __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Unable to open rtsp... ");&#xA;&#xA;        return -1;&#xA;    }&#xA;&#xA;    for (i = 0; i &lt; context->nb_streams; i&#x2B;&#x2B;)&#xA;    {               &#xA;        // Find the Decoder.&#xA;        codec = avcodec_find_decoder(context->streams[i]->codec->codec_id);&#xA;        if (codec->type  == AVMEDIA_TYPE_VIDEO ) {&#xA;            __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Found Video Streaming..  ");&#xA;            videoStreamIndex = i;&#xA;&#xA;        }&#xA;    }&#xA;&#xA;    // Play RTSP&#xA;    av_read_play(context);&#xA;&#xA;    // Get Codec Context.&#xA;    pCodecCtx = context->streams[videoStreamIndex]->codec;&#xA;    if ( pCodecCtx == NULL )&#xA;        __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "CodecCtx is NULL>>> ");&#xA;    else&#xA;        __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "CodecCtx is &lt;&lt;<ok>>> ");&#xA;&#xA;&#xA;    //Find the Decoder.&#xA;    pCodec = avcodec_find_decoder (pCodecCtx->codec_id);&#xA;    avcodec_open2 (pCodecCtx, pCodec, NULL);&#xA;&#xA;&#xA;    int w = pCodecCtx->width;  // Why me getting 0 ? &#xA;    int h = pCodecCtx->height;&#xA;&#xA;    window = SDL_CreateWindow ("Test ffmpeg",SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, SDL_WINDOW_SHOWN|SDL_WINDOW_ALLOW_HIGHDPI);&#xA;    // What this HIGHDPI Means ??&#xA;&#xA;    if ( window != NULL ) &#xA;    {&#xA;        LOGD (" WINDOW CREATED.. , create Renderer ..");&#xA;        renderer = SDL_CreateRenderer (window, -1, 0);  &#xA;    }&#xA;    else&#xA;    {&#xA;        LOGD (" Invalid SDL Window ");  &#xA;    }&#xA;__android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Width and Height of PCodeccCtx.. %d .. %d " , w, h); &#xA;    return 0;&#xA;}&#xA;</ok>