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• ffmpeg : error reading header pipe:0 : Invalid argument

  25 février 2021, par Дмитрий Бондаренко

  I need microservice (converter audio using streams), but have problem with ffmpeg

  


  my test ffmpeg

  


  package codec

import (
    "bytes"
    "os"
    "os/exec"
    "testing"
)

func Test1(t *testing.T) {
    in, err := os.Open("/mp4-mp3/src.m4a")
    if err != nil {
        t.Fatal(err.Error())
    }
    out, err := os.OpenFile("/mp4-mp3/out.mp3", os.O_RDWR|os.O_CREATE, 0666)
    if err != nil {
        t.Fatal(err.Error())
    }
    cmd := exec.Command(
        "ffmpeg",
        "-f", "m4a",
        "-i", "pipe:0",
        "-f", "mp3",
        "pipe:1")

    cmd.Stdin = in
    cmd.Stdout = out
    stderr := &bytes.Buffer{}
    cmd.Stderr = stderr
    if err := cmd.Run(); err != nil {
        t.Logf(stderr.String())
        t.Fatal(err.Error())
    }

}



  


  At the exit, I have the error invalid argument
i tried different options but the problem didn't change

  


  === RUN   Test1
    codec_test.go:31: ffmpeg version git-2020-08-31-4a11a6f Copyright (c) 2000-2020 the FFmpeg developers
          built with gcc 10.2.1 (GCC) 20200805
          configuration: hide...
          libavutil      56. 58.100 / 56. 58.100
          libavcodec     58.101.101 / 58.101.101
          libavformat    58. 51.101 / 58. 51.101
          libavdevice    58. 11.101 / 58. 11.101
          libavfilter     7. 87.100 /  7. 87.100
          libswscale      5.  8.100 /  5.  8.100
          libswresample   3.  8.100 /  3.  8.100
          libpostproc    55.  8.100 / 55.  8.100
        [mov,mp4,m4a,3gp,3g2,mj2 @ 0000019ccc3acb40] error reading header
        pipe:0: Invalid argument
    codec_test.go:32: exit status 1
--- FAIL: Test1 (0.07s)
FAIL

Process finished with exit code 1


  


  i decided to use cmd, but i have new problem
pipe:0 : Invalid data found when processing input

  


  cat src.m4a | ffmpeg -f m4a -i pipe:0 out.mp3
ffmpeg version git-2020-08-31-4a11a6f Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200805
  configuration: hide...
  libavutil      56. 58.100 / 56. 58.100
  libavcodec     58.101.101 / 58.101.101
  libavformat    58. 51.101 / 58. 51.101
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000019afa98d800] invalid STSD entries 1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000019afa98d800] error reading header
pipe:0: Invalid data found when processing input



  


  How to properly set ffmpeg parameters to convert from stream to stream ?

  


• Animated GIF to video with ffmpeg - wrong timing

  27 juillet 2017, par BarbaraKwarc

  I’m trying to convert an animated GIF to video with ffmpeg, but there’s a strange problem : the time delays of each frame seem to be off by one frame.
  For example, if the frame #1 is supposed to be shown for 2000 ms and the frames from #2 to #10 are supposed to be shown for 100 ms each, in the resulting video it immediately skips to the frame #2 which is shown for 2000 ms instead :P

  Is this some kind of a bug ? Or am I doing something wrong ?

  Here’s my command line :

  ffmpeg –i Mnozenie_anim_deop.gif Mnozenie_anim.mp4

  (Aside : why doesn’t the "-" show up in code blocks unless I replace it with "–" ?)

  so nothing extraordinary, just the defaults. (Unless this is the root of the problem ? Maybe my defaults are bad, and I need to specify some magic options ?)

  This problem seems to appear for any video formats except MKV, and when I play these files in mplayer, they all behave that way except MKV.

  But when I open them in kdenlive (a non-linear video editing program), the problem appears in all of them, including MKV (which is strange, because it plays back just fine in mplayer :q ).

  I tried converting the same exact file with this online converter here :
  https://ezgif.com/gif-to-mp4
  and there is no problem with its output – it plays back fine both in mplayer and when imported to kdenlive, so I guess they must have been using some magic command line options that I’m missing.

  Any ideas what can be wrong and how to track down the culprit ?

  Edit : Here’s a sample animated GIF file I’m trying to convert :
  http://nauka.mistu.info/Matematyka/Algebra/Szeregi/Mnozenie_anim.gif
  and the MP4 file that I generated from it which demonstrates this problem :
  http://sasq.comyr.com/Stuff/Mnozenie_anim.mp4
  As you can see, the fade in starts prematurely but stops for a couple of seconds instead of waiting for a couple of seconds BEFORE the fade in begins.

• Video streaming- control frame rate x264

  3 mars 2017, par H.A

  I’m new to video coding, I found this https://github.com/RafaelPalomar/H264LiveStreamer application code very useful to my project. I want to live stream a webcam over RTP . However, I’m having problem selecting the Frame Per Seconds (FPS). below is the function that controls the encoding param.

  void x264Encoder::initilize()
  
  {
  
    x264_param_default_preset(&parameters, "veryfast", "zerolatency");
  
    parameters.i_log_level =  X264_LOG_DEBUG;
  
    parameters.i_threads = 1;
  
    parameters.i_width = 640;
  
    parameters.i_height = 480;
  
    parameters.i_fps_num = 25;
  
    parameters.i_fps_den = 1;
  
    parameters.i_keyint_max = 25;
  
    parameters.b_intra_refresh = 1;
  
    parameters.rc.i_rc_method = X264_RC_CRF;
  
    parameters.rc.i_vbv_buffer_size = 1000000;
  
    parameters.rc.i_vbv_max_bitrate = 90000;
  
    parameters.rc.f_rf_constant = 25;
  
    parameters.rc.f_rf_constant_max = 35;
  
    parameters.i_sps_id = 7;
  
    // the following two value you should keep 1
  
    parameters.b_repeat_headers = 1;    // to get header before every I-Frame
  
    parameters.b_annexb = 1; // put start code in front of nal. we will remove start code later
  
    x264_param_apply_profile(&parameters, "baseline");
  
  
  
    encoder = x264_encoder_open(&parameters);
  
    x264_picture_alloc(&picture_in, X264_CSP_I420, parameters.i_width, parameters.i_height);
  
    picture_in.i_type = X264_TYPE_AUTO;
  
    picture_in.img.i_csp = X264_CSP_I420;
  
    // i have initilized my color space converter for BGR24 to YUV420 because my opencv video capture gives BGR24 image. You can initilize according to your input pixelFormat
  
    convertContext = sws_getContext(parameters.i_width,parameters.i_height, PIX_FMT_BGR24, parameters.i_width,parameters.i_height,PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
  
  }

  I’m using VLC as client whatever number i set i_fps_num to, I always get 12-14 FPS. fore example, in VLC Codec tab shows 25 FPS but in Stream statistics tab it shows it only display 13 FPS on average. here is the X264 encoder output

  x264 [debug]: frame=  72 QP=22.24 NAL=2 Slice:P Poc:144 I:97   P:116  SKIP:987  size=1464 bytes
  
  x264 [info]: frame I:1     Avg QP:20.06  size: 17848
  
  x264 [info]: frame P:72    Avg QP:22.12  size:  1337
  
  x264 [info]: mb I  I16..4: 40.2%  0.0% 59.8%
  
  x264 [info]: mb P  I16..4:  3.1%  0.0%  2.3%  P16..4:  8.3%  2.0%  0.6%  0.0%  0.0%    skip:83.7%
  
  x264 [info]: coded y,uvDC,uvAC intra: 53.6% 46.4% 7.4% inter: 3.0% 1.6% 0.0%
  
  x264 [info]: i16 v,h,dc,p: 11% 65% 12% 12%
  
  x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 46% 16%  3%  4%  3%  5%  3%  6%
  
  x264 [info]: i8c dc,h,v,p: 46% 42% 10%  2%
  
  x264 [info]: kb/s:312.60

  the last frame number that was encoded is 72 while in VLC stream statistics it shows that 133 frames are Displayed and 66 blocks are decoded for 10 seconds streaming in addition the video playback is bursty.

  my question is how to change the x264 parameters to get 25 FPS ?