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• FFMPEG RTX 8000 out of memory

  23 juin 2020, par Mahdi Adnan

  I have an RTX 8000 and I'm using FFMPEG to transcode multiple streams concurrently.
Each stream consume around 575MiB, and when the memory usage reaches around 28000MiB, FFMPEG throw the following message when starting a new transcode session :

  



  [h264_nvenc @ 0x55cd1d574800] dl_fn->cuda_dl->cuCtxCreate(&ctx->cu_context_internal, 0, cu_device) failed -> CUDA_ERROR_OUT_OF_MEMORY : out of memory
[h264_nvenc @ 0x55cd1d574800] No NVENC capable devices found
Error initializing output stream 2:0 — Error while opening encoder for output stream #2:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  



  The machine is running Ubuntu 20.04
FFMPEG is a snap package from Ubuntu repo "version 4.2.2-1ubuntu1"
nVidia driver nvidia-driver-435 installed from Ubuntu repo

  



  command used for the transcode :
ffmpeg -i SRC -c:v h264_cuvid -vcodec h264_nvenc -preset:v medium -profile:v main -vf "scale=1920 :-2" -hls_flags delete_segments -hls_init_time 4 -hls_time 4 -maxrate 6000k -g 100 -bufsize 12000k -b:v 3000k -start_number 1 -async 1 -c:a aac -b:a 128k 1080.m3u8

  



  Is the RTX 8000 have any limitation on the Memory usage ? are the parameters I'm using causing this issue ?

  



  Thanks

  


• Error of FFmpeg on Java in "av_image_copy_to_buffer" method during decoding H.264 stream

  26 mai 2020, par maru2213

  I'm trying to decode H.264 stream, which is sent over Socket from an Android application to a computer. And I also want to show the decoded stream using JavaFX. I searched for a long time, and decided to use JavaCV / FFmpeg. However I got error from FFmpeg. (I was inspired by this code.)

  



  Questions :

  



  

  • Why does FFmpeg make error ?

  


  • Is it a correct way to convert AVFrame to javafx.scene.image.Image ?

  


  



  I'm using :

  



  

  • javacv-platform 1.4.4

  


  • ffmpeg-platform 4.1-1.4.4

  


  



  Code :

  



  This is a part of import and class fields, and method which runs once at the first time. (Actually the content of initialize() is wrapped by try catch.)

  



      import javafx.scene.image.Image;

    private avcodec.AVCodec avCodec;
    private avcodec.AVCodecContext avCodecContext;
    private avutil.AVDictionary avDictionary;
    private avutil.AVFrame avFrame;

    public void initialize() {
        avCodec = avcodec_find_decoder(AV_CODEC_ID_H264);
        if (avCodec == null) {
            throw new RuntimeException("Can't find decoder");
        }
        avCodecContext = avcodec_alloc_context3(avCodec);
        if (avCodecContext == null) {
            throw new RuntimeException("Can't allocate decoder context");
        }
        int result = avcodec_open2(avCodecContext, avCodec, (AVDictionary) null);
        if (result < 0) {
            throw new RuntimeException("Can't open decoder");
        }
        avFrame = av_frame_alloc();
        if (avFrame == null) {
            throw new RuntimeException("Can't allocate frame");
        }
    }


  



  And this is a method which is called every time when I receive a packet from Android. byte[] data is the packet data starting with 0x00, 0x00, 0x00, 0x01.

  



  The place where I get error is number_of_written_bytes. It always gets <0.

  &#xA;&#xA;

      private void decode(byte[] data) {
        AVPacket avPacket = new AVPacket();
        av_init_packet(avPacket);
        avPacket.pts(AV_NOPTS_VALUE);
        avPacket.dts(AV_NOPTS_VALUE);
        BytePointer bytePointer = new BytePointer(data);
        bytePointer.capacity(data.length);
        avPacket.data(bytePointer);
        avPacket.size(data.length);
        avPacket.pos(-1);

        avcodec_send_packet(avCodecContext, avPacket);
        int result = avcodec_receive_frame(avCodecContext, avFrame);
        if (result >= 0) {
            int bufferOutputSize = av_image_get_buffer_size(avFrame.format(), avFrame.width(), avFrame.height(), 16);
            Pointer pointer = av_malloc(bufferOutputSize);
            BytePointer outputPointer = new BytePointer(pointer);
            int number_of_written_bytes = av_image_copy_to_buffer(outputPointer, bufferOutputSize, avFrame.data(), avFrame.linesize(), avFrame.chroma_location(), avFrame.width(), avFrame.height(), 1);
            if (number_of_written_bytes < 0) {
                //The process always come here.
                throw new RuntimeException("Can't copy image to buffer");
            }

            System.out.println("decode success");
            Image image = new Image(new ByteArrayInputStream(outputPointer.asBuffer().array()));
        } else {
            System.out.println("decode failed");
        }
    }


  &#xA;&#xA;

  Anything is helpful for me. Thanks.

  &#xA;

• Problem with ffmpeg rtp stream to janus webrtc

  13 juin 2020, par XPModder

  I am trying to use ffmpeg and janus-gateway to stream video in the local network. I am piping the h264 video directly in to ffmpeg and from there it gets transferred to janus as an rtp stream. Janus then does the rest.

  &#xA;&#xA;

  The problem is, that when I try to open the stream using the streamingtest html page included in janus, I can select the stream, but I never get to see anything. On the console where I started janus, it throws multiple errors starting with : "SDP missing mandatory information"

  &#xA;&#xA;

  After starting ffmpeg it shows the SDP in console :

  &#xA;&#xA;

  v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 58.20.100
m=video 8004 RTP/AVP 96
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1; sprop-parameter-sets=J2QAKKwrQDwBE/LAPEiagA==,KO4BNywA; profile-level-id=640028


  &#xA;&#xA;

  The command I use to start ffmpeg is the following :

  &#xA;&#xA;

  ffmpeg -loglevel quiet -y -i - -c:v copy -preset veryfast -f rtp rtp://127.0.0.1:8004


  &#xA;&#xA;

  I assume that I am missing something in the ffmpeg command and therefore there is some kind of problem with the SDP.

  &#xA;&#xA;

  Edit : I looked a little further into this and actually looked at the code for janus at the lines that throw the error. Then I traced that to the origin of the error.

  &#xA;&#xA;

  Apparently the SDP is supposed to contain some authorization in for of this :

  &#xA;&#xA;

  a=... ice-ufrag=?; ice-pwd=?


  &#xA;&#xA;

  So how do I find out what this username and password are and how do I get it in to the SDP from ffmpeg ?

  &#xA;&#xA;

  Or how do I disable this entirely ?

  &#xA;