Recherche avancée

Sur d’autres sites (15115)

• ffmpeg : Could not find codec parameters for stream 1 (Video : vp8, yuv420p) : unspecified size ?

  17 août 2024, par Thomas Carlton

  I have an RTP stream coming from Kurento Media Server.

  


  I would like to record this stream to a file using ffmpeg. I'm running the command

  


  ffmpeg -protocol_whitelist file,crypto,udp,rtp -i a.sdp -c:v libx264 -analyzeduration 100M -probesize 100M -y output.mp4


  


  The SDP File is :

  


  v=0
o=- 3831930560 3831930560 IN IP4 127.0.0.1
s=Kurento Media Server
c=IN IP4 127.0.0.1
t=0 0
m=audio 20000 RTP/AVPF 96 0 97
a=setup:actpass
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=rtpmap:96 opus/48000/2
a=rtpmap:97 AMR/8000
a=rtcp:13001
a=sendrecv
a=mid:audio0
a=ssrc:2843019226 cname:user7547104516@host-14132be
m=video 20002 RTP/AVPF 102 103
a=setup:actpass
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=rtpmap:102 VP8/90000
a=rtpmap:103 H264/90000
a=fmtp:103 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
a=rtcp:56917
a=sendrecv
a=mid:video0
a=rtcp-fb:102 nack
a=rtcp-fb:102 nack pli
a=rtcp-fb:102 goog-remb
a=rtcp-fb:102 ccm fir
a=rtcp-fb:103 nack
a=rtcp-fb:103 nack pli
a=rtcp-fb:103 ccm fir
a=ssrc:1320996934 cname:user7547104516@host-14132be


  


  ffmpeg starts recording however it records only audio. No video recorded and I'm having the error :

  


  


  Could not find codec parameters for stream 1 (Video : vp8, yuv420p) : unspecified size

  


  


  How can I solve that ?

  


  

  


• BGRA to YUV420 FFmpeg giving bad output

  6 octobre 2020, par NewbieCoder

  My purpose is a screen recorder. I am using the Windows DXGI API to receive screenshots and I'm encoding the screenshots into a video using libx264. Feeding BGRA images directly to libx264 is producing weird colors in the output video. So, to get correct colors, I am trying to convert the BGRA to YUV420p. To speed up encoding, I am also trying to downscale the BGRA image.

  


  So I am getting an 1920x1080 BGRA image and I want to convert it to 1280x720 YUV420p. For this, I am using FFmpeg swscale library to do both the format conversion and downscaling.

  


  The problem is that the output video is coming like 3 images in the same frame. Please see this video. https://imgur.com/a/EYimjrJ

  


  I tried just BGRA to YUV conversion without any downscaling and it is working fine. But BGRA to YUV with downscaling is giving this problem.

  


  What is the cause for this problem ? How do I fix it ?

  


  Here is my code snippet :

  


  uint8_t* Image;
x264_picture_t picIn, picOut;
x264_picture_alloc(&picIn, X264_CSP_I420, 1280, 720);

SwsContext* sws = sws_getContext(1920, 1080, AV_PIX_FMT_BGRA, 1280, 720, AV_PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);

while (true)
{
    take_screenshot(&Image);

    AVFrame BGRA;
    BGRA.linesize[0] = 1280 * 4;
    BGRA.data[0] = Image;
    sws_scale(sws, BGRA.data, BGRA.linesize, 0, 1080, picIn.img.plane, picIn.img.i_stride);

    nal_size = x264_encoder_encode(h, &nals, &nal_count, &picIn, &picOut);
    save_to_flv(nals, nal_size, nal_count);
}


  


  Here are my libx264 parameters :

  


          x264_param_default_preset(&param, preset, 0);
        param.i_csp = X264_CSP_I420;
        param.i_width = 1280;
        param.i_height = 720;
        param.i_fps_num = 30;
        param.i_fps_den = 1;
        param.rc.i_bitrate = 2500;
        param.i_bframe = 0;
        param.b_repeat_headers = 0;
        param.b_annexb = 1;     

        x264_param_apply_profile(&param, 0);
        h = x264_encoder_open(&param);


  


• BGRA to YUV420 FFmpeg giving bad output

  6 octobre 2020, par NewbieCoder

  My purpose is a screen recorder. I am using the Windows DXGI API to receive screenshots and I'm encoding the screenshots into a video using libx264. Feeding BGRA images directly to libx264 is producing weird colors in the output video. So, to get correct colors, I am trying to convert the BGRA to YUV420p. To speed up encoding, I am also trying to downscale the BGRA image.

  


  So I am getting an 1920x1080 BGRA image and I want to convert it to 1280x720 YUV420p. For this, I am using FFmpeg swscale library to do both the format conversion and downscaling.

  


  The problem is that the output video is coming like 3 images in the same frame. Please see this video. https://imgur.com/a/EYimjrJ

  


  I tried just BGRA to YUV conversion without any downscaling and it is working fine. But BGRA to YUV with downscaling is giving this problem.

  


  What is the cause for this problem ? How do I fix it ?

  


  Here is my code snippet :

  


  uint8_t* Image;
x264_picture_t picIn, picOut;
x264_picture_alloc(&picIn, X264_CSP_I420, 1280, 720);

SwsContext* sws = sws_getContext(1920, 1080, AV_PIX_FMT_BGRA, 1280, 720, AV_PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);

while (true)
{
    take_screenshot(&Image);

    AVFrame BGRA;
    BGRA.linesize[0] = 1280 * 4;
    BGRA.data[0] = Image;
    sws_scale(sws, BGRA.data, BGRA.linesize, 0, 1080, picIn.img.plane, picIn.img.i_stride);

    nal_size = x264_encoder_encode(h, &nals, &nal_count, &picIn, &picOut);
    save_to_flv(nals, nal_size, nal_count);
}


  


  Here are my libx264 parameters :

  


          x264_param_default_preset(&param, preset, 0);
        param.i_csp = X264_CSP_I420;
        param.i_width = 1280;
        param.i_height = 720;
        param.i_fps_num = 30;
        param.i_fps_den = 1;
        param.rc.i_bitrate = 2500;
        param.i_bframe = 0;
        param.b_repeat_headers = 0;
        param.b_annexb = 1;     

        x264_param_apply_profile(&param, 0);
        h = x264_encoder_open(&param);