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• FFMPEG, running through subprocess, getting error : "pipe: : Invalid data found when processing input"

  19 avril 2020, par mamba9999

  Im writing a program which getting the stream from ip camera, do with frame what i need and send to ffmpeg for transcoding. Then ffmpeg should convert video and send to output url.
But when i running script, i get the error : "pipe: : Invalid data found when processing input".
Im really newby in ffmpeg. Please help, what i doing wrong.

  



  
cap = cv2.VideoCapture("rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov")

command = [
    "ffmpeg",
    "-i", "-",
    "-f", "mpegts",
    "-vcodec", "mpeg1video",
    "-s", "960x540",
    "-b:v", "1000K",
    "-r", "30",
    "-bf", "0",
    "-codec:a", "mp2",

    "http://127.0.0.1:8888/yoursecret"
]

proc = subprocess.Popen(command, stderr=subprocess.PIPE, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
out, err = proc.communicate()


print(err)

while True:
    ret, frame = cap.read()
    # _, buf = cv2.imencode('.jpg', frame)
    # img_byte = io.BytesIO(buf.tobytes())
    try: 
        proc.stdin.write(frame.tostring())
        print("SENDED")
    except IOError as e:
        print(e) 
        proc.stdin.close()
        proc.wait() 

proc.stdin.close()
proc.wait()


  



  Traceback

  



  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with Apple clang version 11.0.0 (clang-1100.0.33.17)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
pipe:: Invalid data found when processing input


  


• gphoto2 pipe: : Invalid data found when processing input

  13 avril 2020, par Taegan Obermeyer

  So I have been following this tutorial https://medium.com/nerdery/dslr-webcam-setup-for-linux-9b6d1b79ae22 and when I got to the point to actually take a photo with the camera I have no issues but when I get to try to capture with it I get 
pipe:: Invalid data found when processing input

  



  The entire command is listed as follows :

  



  $ gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0
Capturing preview frames as movie to 'stdout'. Press Ctrl-C to abort.
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
ERROR: Movie capture error... Exiting.
Movie capture finished (0 frames)
pipe:: Invalid data found when processing input


  


• How to pipe frames in stdout using FFMPEG and Golang

  6 avril 2020, par Sven.DG

  I am fairly new to Golang, my goal is to build a script in Golang that :

  



  

  1. Transcodes the video input .MOV file into frames, using FFMPEG

  


  2. Some downstream process that does something with the emitted frames.

  


  



  Currently I have the following code as a first attempt :

  



  package main

import (
    "fmt"
    "os/exec"
    "strconv"
    "io"
)

const (
    frameX      = 240
    frameY      = 135
    frameSize   = frameX * frameY * 3
)

func main() {
    ffmpeg := exec.Command("ffmpeg", "-i", "project/data/sample.mov", "-vf",  "fps=fps=1/2", "-s", strconv.Itoa(frameX)+"x"+strconv.Itoa(frameY), "-f", "rawvideo", "pipe:1") //nolint
    ffmpegOut, _ := ffmpeg.StdoutPipe()

    if err := ffmpeg.Start(); err != nil {
        panic(err)
    }

    reader(ffmpegOut)
    fmt.Println("Completed. YAY")
}

func reader(ffmpegOut io.Reader) {
    buf := make([]byte, frameSize)
    fmt.Println("Looping..")
    counter := 0
    for {
        if _, err := io.ReadFull(ffmpegOut, buf); err != nil {
            // fmt.Println(err)
        }
        if buf[0] != 0 {
            fmt.Println("Got a frame!!")
            counter++
            fmt.Println(counter)
        }
    }
    fmt.Println("total amount of frames", counter)
}


  



  This is mainly based on this example : https://github.com/pion/example-webrtc-applications/blob/master/gocv-receive/main.go

  



  However, when running this code, it appears that I'm getting an endless amount of data in my downstream reader. I would expect that the counter equals the amount of frames but that is clearly not the case looking at the rate at which the counter increases, so obviously I am doing something wrong. Can anybody point me in the right direction ?

  



  I used the sample .mov file with 1280 x 720 resolution here : https://file-examples.com/index.php/sample-video-files/sample-mov-files-download/.
The video is about 31 seconds so I would expect to see 15 frames downstream in the reader.

  



  Cheers !