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• SAT-IP Server and VLC

  10 novembre 2013, par Chris

  I have a Sat-IP Server/Converter, Triax TSS 400.
  I can recieve with VLC the stream as MPEGTS (via http) but it is very slow (lagging) trought my Powerline (currently powerline speed is 141mbit).
  I have a SAT-IP DVBviever Client on my Notebook which is working 100% perfect, SD and HD channels.
  I have seen in wireshark, that when i'm connect the SAT-IP Server with the SAT-IP Client, im reciving RTSP stream.
  ...and now my problem : how can is recieve RTSP/RTP stream instead of HTTP stream from Triax TSS 400 ?
  What is the command to Tune this device to get channel working/streaming with ffmpeg ?
  ...or maybe is there a ChannelList with all the Astra 19,2° channels for HTTP stream from Triax TSS 400 ?

  thx

• ffmpeg record a stereo track from line inputs

  17 octobre 2022, par tony

  I'm trying to record the first 2 inputs of my USB soundcard using ffmpeg and jack
This is to create the ffmpeg client for jack

  


  ffmpeg -f jack -i ffmpeg -c:a aac -ac 2 output.wav

  


  then checking the qjackctl interface I can see the client ffmpeg created and I connect it with the 2 inputs of my soundcard but the output.wav have no sound

  


• How to ensure that ffmpeg libraries uses/ not uses GPU

  31 mai 2021, par zimopisec

  My library ( Linux, Debian) uses FFMpeg libraries ( avformat, avcodec, swscale etc) for reading video stream from network cameras. Actually, I need to capture each video frame from network camera, decode it, scale and store in memory- and other thread pass this data to calling program for display.

  


  Problem is, that all works in CPU and take a huge amount of CPU resource. How can I enforce usage of GPU accelerator for processing ?

  


  I have video card : VGA compatible controller : Intel Corporation HD Graphics 620 (rev 02)

  


  My decode thread look like this ( I omit declarations, error handling etc, so pls don't look for grammar mistakes :)))

  


  fmt = avformat_alloc_context(); 
//initialising, setting option by av_dict_set
// finding video stream index
***
 // finding decoder and allocate its contexts

    frame = av_frame_alloc();

    while ( av_read_frame(ctx->fmt, &pkt) >= 0) 
    {
        AVPacket orig_pkt = pkt;

         avcodec_send_packet(ctx->dec_ctx, pkt);
         avcodec_receive_frame(ctx->dec_ctx, frame);
            *** 
// get buffer allocated for store of frame data
             buff = get_free_buffer(ctx);
        sws_scale(ctx->sws, (const uint8_t * const*)frame->data, 
        frame->linesize, 0, ctx->dec_ctx->height, buff->data,
        buff->linesize);
            ret = decode_packet(ctx, frame, &pkt, &got_frame);
            if (ret < 0)
                break;
            pkt.data += ret;
            pkt.size -= ret;
        }
        while (pkt.size > 0);

        av_packet_unref(&orig_pkt);
    }
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