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• What's the difference between H265, x265, x264, H264 and which of these uses GPU instead of CPU and how to use H265 GPU NVIDIA acceleration in ffmpeg ?

  30 juillet 2022, par Fab98

  I'm not sure if
x264/5
use CPU and if h264/5 use GPU and also if h265 is basically HEVC_NVENC for NVIDIA GPU acceleration. So, if you could give me more info about these encoding types it would be great. I understood that, summing up a lot, x26* use CPU and are slower but more accurate while h26* are the opposite but h265 is the most recent and optimal trade off.
Furthermore, I was trying to convert a video using GPU acceleration and my question is :

  


  Does the following command tell to the GPU to use h265 to encode a video holding the same audio and at upgrading it at its maximum video quality ? Furthermore, are there other ways to express the same command ?

  


  ffmpeg.exe -hwaccel_output_format cuda -i "input" -c:v hevc_nvenc -preset medium -rc constqp -qp 0 -c:a copy "output"


  


• How do I send buffer to a virtual camera driver ?

  15 juin 2022, par rvega01

  I'm currently working on a project in a Windows environment where I have a Node.js application that accepts an RTSP video stream from a button click and I would like to stream the video data to a virtual camera driver and have it displayed within Microsoft Teams and Skype. The driver that I'm using and have installed (https://github.com/robot9706/VirtualCameraDriver) mentions that the filter implemented in the driver contains a property with a GUID that I can send buffer to.

  


  I was wondering if anyone know of a javascript/node.js library, ffmpeg/gstreamer command, or any solution that comes to mind that can allow me to send video data to that GUID. I have tried outputting the RTSP stream to a videosink with g-streamer but I was unable to specify the display name for the output to be directed to.

  


  With ffmpeg, I was able to find the driver info with DShow but I can only implement the driver as an video input and I'm unable to select the driver as an output through DShow. If there is an gstreamer/ffmpeg solution, please let me know as I'm inexperienced with video streaming and I have looked through many threads here but I'm unable to find an answer.

  


• how to set nVidia video bitrate in a system service ?

  12 septembre 2021, par qycx

  I use an nvidia card for compression and decompression in a video conferencing software. The program uses ffmpeg. The program is a system service. Need to control the bit rate. But I found that I didn't control it. The setting code rate was 700k, and the actual value was 10M. What went wrong ?

  


  /* put sample parameters */
    pUnit->encV_var.c->bit_rate = bitrate;//400000;
    /* resolution must be a multiple of two */
    pUnit->encV_var.c->width = in_w;//352;
    pUnit->encV_var.c->height = in_h;//288;
    pUnit->encV_var.c->qmin=10;
    pUnit->encV_var.c->qmax=30;
    /* frames per second */
    AVRational t1={1,25};
    t1.den=fps;
    pUnit->encV_var.c->time_base = t1;//(AVRational){1, 25};
    AVRational t2={25,1};
    t2.num=fps;
    pUnit->encV_var.c->framerate = t2;//(AVRational){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
     */
    pUnit->encV_var.c->gop_size = 256;//10;
    pUnit->encV_var.c->max_b_frames = 0;//1;
    pUnit->encV_var.c->pix_fmt = AV_PIX_FMT_YUV420P;