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• Why my ffmpeg video encode codes does not work on other computer ?

  10 avril 2022, par Object Unknown

  I'm writing code to encode some cv::Mat images to a MP4 video. The program can run successfully in my computer which I developed it, but when I copied it (and all dlls it needs) to an other computer, it stopped work.

  


  The function which reporting error : (I got it from StackOverflow, and added some changes)

  


  int uns::VideoWriter::Remux()
{
    AVFormatContext* ifmt_ctx = NULL, * ofmt_ctx = NULL;
    int err = 0, ret = 0;
    int64_t ts = 0;
    AVStream* inVideoStream = NULL;
    AVStream* outVideoStream = NULL;
    if ((err = avformat_open_input(&ifmt_ctx, VIDEO_TMP_FILE.c_str(), 0, 0)) < 0)
    {
        if(callback != nullptr) 
            callback("[uns::VideoWriter/Remux] Failed to open input file for remuxing", err);
        ret = -1;
        goto end;
    }
    if ((err = avformat_find_stream_info(ifmt_ctx, 0)) < 0) 
    {
        if(callback != nullptr) 
            callback("[uns::VideoWriter/Remux] Failed to retrieve input stream information", err);
        ret = -2;
        goto end;
    }
    if ((err = avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, FINAL_FILE_NAME.c_str())))
    {
        if(callback != nullptr) 
            callback("[uns::VideoWriter/Remux] Failed to allocate output context", err);
        ret = -3;
        goto end;
    }
    inVideoStream = ifmt_ctx->streams[0];
    outVideoStream = avformat_new_stream(ofmt_ctx, NULL);
    if (!outVideoStream) 
    {
        if(callback != nullptr) 
            callback("[uns::VideoWriter/Remux] Failed to allocate output video stream", 0);
        ret = -4;
        goto end;
    }
    outVideoStream->time_base = { 1, fps };
    if ((err = avcodec_parameters_copy(outVideoStream->codecpar, inVideoStream->codecpar)) < 0)
    {
        if (callback != nullptr)
            callback("[uns::VideoWriter/Remux] Failed to copy stream information", err);
        return -4;
        goto end;
    }
    outVideoStream->codecpar->codec_tag = 0;
    if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) 
    {
        if ((err = avio_open(&ofmt_ctx->pb, FINAL_FILE_NAME.c_str(), AVIO_FLAG_WRITE)) < 0)
        {
            if(callback != nullptr) 
                callback("[uns::VideoWriter/Remux] Failed to open output file", err);
            ret = -5;
            goto end;
        }
    }
    ofmt_ctx->streams[0]->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
    ofmt_ctx->streams[0]->time_base.num = 1;
    ofmt_ctx->streams[0]->time_base.den = fps;
    if ((err = avformat_write_header(ofmt_ctx, 0)) < 0) 
    {
        if(callback != nullptr) 
            callback("[uns::VideoWriter/Remux] Failed to write header to output file", err);
        ret = -6;
        goto end;
    }
    AVPacket videoPkt;
    while (true) 
    {
        if ((err = av_read_frame(ifmt_ctx, &videoPkt)) < 0) 
        {
            break;
        }
        videoPkt.stream_index = outVideoStream->index;
        videoPkt.pts = ts;
        videoPkt.dts = ts;
        videoPkt.duration = av_rescale_q(videoPkt.duration, inVideoStream->time_base, outVideoStream->time_base);
        ts += videoPkt.duration;
        videoPkt.pos = -1;
        if ((err = av_interleaved_write_frame(ofmt_ctx, &videoPkt)) < 0) 
        {
            if(callback != nullptr) 
                callback("[uns::VideoWriter/Remux] Failed to mux packet", err);
            av_packet_unref(&videoPkt);
            break;
        }
        av_packet_unref(&videoPkt);
    }
    av_write_trailer(ofmt_ctx);
end:
    if (ifmt_ctx) 
    {
        avformat_close_input(&ifmt_ctx);
    }
    if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) 
    {
        avio_closep(&ofmt_ctx->pb);
    }
    if (ofmt_ctx) 
    {
        avformat_free_context(ofmt_ctx);
    }
    return ret;
}


  


  Notes :

  


  


  callback is a function which prints error messsage and error code.

  
The error I recived is [uns::VideoWriter/Remux] Failed to write header to output file, error code: -22

  


  


  I want to know what is causing this and how to resolve it please.

  


  Other Informations :

  


  


  Developing Env :

  


  


  OS : Windows 11 Professional Workstation build 22593.ni_release
  
IDE : Visual Studio 2022
  
ffmpeg : 4.4.1
  
Installed ffmpeg library :
ffmpeg[avcodec],ffmpeg[avdevice],ffmpeg[avfilter],ffmpeg[avfilter],ffmpeg[avformat],ffmpeg[openh264],ffmpeg[swresample],ffmpeg[swscale]
  
Compile Settings : x64 Release
  

  


  


  


  


  Running Env which causing error :

  


  


  OS : Windows Server 2019 DataCenter
  
With all dlls VS2022 copied to release folder

  


  


  


• Cannot find ffmpeg when moving the code to a new computer

  20 septembre 2021, par Omersr

  I have a code that works on my computer but when I moved it to a new one it doesn't find the ffmpeg dependency.
It happens on these lines of code :

  


      var videoshow = require('videoshow')
    var image = [{path: './screenshot.jpg'}]
    var videoOption = { 
      loop: 10,
      fps: 25,
      transition: false,
      transitionDuration: 0, // seconds
      videoBitrate: 1024,
      videoCodec: 'libx264',
      size: '640x?',
      audioBitrate: '128k',
      audioChannels: 2,
      format: 'mp4',
      pixelFormat: 'yuv420p'
    }
    //call the videoshow library
     videoshow(image,videoOption).save(filename+"_"+"movie.mp4").on('start',function(command){
         console.log("conversion started" + command)
    }).on('error',function(err,stdout,stderr){
         console.log("some error occured"+ err)
     }).on('end',function(output){
         console.log("conversion complete "+ output)


  


  It throws an error "Cannot find ffmpeg".
I tried to do npm install or npm install ffmpeg but it didn't help.
I think this happens because I don't know how to make dependencies work on a different computer.
Any help would be appreciated !

  


• Using FFMPEG to stream from one computer to another on the same network

  23 juin 2021, par Andy B

  My problem

  


  I have a device with cameras, and I can access the video from those cameras via RTP over RTSP.

  


  I have an Ethernet cord going from the device to my computer, and I can see/record the video from the device using FFMPEG or VLC. I just use rtsp://<ip of="of" device="device">/path/of/stuff.extension?camera=<number></number></ip> like the user's manual says.

  


  This works great, but ultimately, I want to stream this video to another computer on the same network. I have tried many different things, but nothing seems to work.

  


  Theoretically, this FFMPEG command should work, but I'm messing up somewhere and I don't know why or where.

  


  ffmpeg -rtsp_transport tcp -i rtsp://<ip of="of" device="device">/path/thing.extension?camera=1 \ &#xA;-f mpegts udp://<ip of="of" computer="computer" i="i" want="want" to="to" send="send" it="it">:<some port="port">&#xA;</some></ip></ip>

  


  In VLC on the other computer, I want to be able to just go into VLC and start a network stream that looks like udp://@<ip address="address">:<port></port></ip>

  


  What I thought would work, but doesn't

  


  If the camera device has IP A.A.A.A, and the computer getting and streaming the video is B.B.B.B, and the computer I want to watch the streamed video on is C.C.C.C then is the following correct ? Because it does not work for me...

  


  Computer A :

  


  ffmpeg -rtsp_transport tcp -i rtsp://A.A.A.A/path.ext?camera=1 -f mpegts udp://B.B.B.B:10001


  


  Computer B (in VLC) : udp://@B.B.B.B:10001