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• java.io.IOException : Cannot run program "/data/user/0/com.package.name/files/ffmpeg" : error=13, Permission denied

  12 avril 2020, par KANAYO AUGUSTIN UG

  I am trying to cut a video using FFmpeg library from com.writingminds:FFmpegAndroid:0.3.2...
When I try to run my command

  



  String[] complexCommand = { "-y", "-i", inputFilePath,"-ss", "" + trimStart, "-t", "" + trim, "-c","copy", outputFilePath};
execFFmpegBinary(complexCommand);


  



  I get this error :

  



  


  E/FFmpeg : Exception while trying to run : [Ljava.lang.String ;@c7a48dd

  
 


  java.io.IOException : Cannot run program "/data/user/0/com.package.name/files/ffmpeg" : error=13, Permission denied

  


  



  Even after making sure the library loaded successfully

  



  private void loadFFMpegBinary() {
    try {
        if (ffmpeg == null) {
            ffmpeg = FFmpeg.getInstance(cntxt);
        }
        ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
            @Override
            public void onFailure() {
                Log.i("success", "false");
            }

            @Override
            public void onSuccess() {
                Log.i("success", "true");
            }
        });
    } catch (FFmpegNotSupportedException e) {
    } catch (Exception e) {
    }
}


  



  I have enabled WRITE_PERMISSION in Android.manifest file, and I also tried to write a file to the storage and it worked.

  



  I guess FFmpeg has a default path to write a file which is /data/user/0/com.package.name/files/ffmpeg, but I need to change the default path please anyone with an idea ?

  


• OpenCV VideoWriter produces "can't find starting number" error

  5 avril 2020, par user3325139

  I am trying to write 16-bit grayscale video using the FFV1 codec and opencv.ImageWriter on Windows 10

  



  Here is my code :

  



  import numpy as np
import cv2, pdb

print(cv2.getBuildInformation())

def to8(img):
    return (img/256).astype('uint8')

cap = cv2.VideoCapture(0+cv2.CAP_DSHOW)
cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter_fourcc('Y','1','6',' '))
cap.set(cv2.CAP_PROP_CONVERT_RGB, False)

out = cv2.VideoWriter('out.avi', cv2.VideoWriter_fourcc('F','F','V','1'), cap.get(cv2.CAP_PROP_FPS), (int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)),int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))))

while True:
    ret, frame = cap.read()
    frame = cv2.normalize(frame,None,0,65535,cv2.NORM_MINMAX)

    cv2.imshow('Video',to8(frame))
    out.write(frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cap.release()
out.release()
cv2.destroyAllWindows()


  



  And here is my error :

  



  [ERROR:0] global C:\projects\opencv-python\opencv\modules\videoio\src\cap.cpp (415) cv::VideoWriter::open VIDEOIO(CV_IMAGES): raised OpenCV exception:

OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\videoio\src\cap_images.cpp:253: error: (-5:Bad argument) CAP_IMAGES: can't find starting number (in the name of file): out.avi in function 'cv::icvExtractPattern'


  



  I am running this script from a command window with admin privileges. I've tried both making sure the output file does and does not exist before running.

  



  My OpenCV build information is here : https://pastebin.com/whtF6ixG

  



  Thanks !

  



  EDIT :
Based on Rotem's suggestion, instead of using VideoWriter I piped directly to FFMPEG using ffmpeg-python :

  



  import numpy as np
import cv2, pdb
import ffmpeg

def to8(img):
    return (img/256).astype('uint8')

cap = cv2.VideoCapture(0+cv2.CAP_DSHOW)
cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter_fourcc('Y','1','6',' '))
cap.set(cv2.CAP_PROP_CONVERT_RGB, False)

ff_proc = (
    ffmpeg
    .input('pipe:',format='rawvideo',pix_fmt='gray16le',s='%sx%s'%(int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)),int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))),r='60')
    .output('out3.avi',vcodec='ffv1',an=None)
    .run_async(pipe_stdin=True)
)

while True:
    ret, frame = cap.read()

    cv2.imshow('Video',to8(frame))
    ff_proc.stdin.write(frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

out.terminate()
cap.release()
cv2.destroyAllWindows()


  


• Why am I getting FFMPEG "cannot set sample format 0x10000 2 (Invalid argument)" error ? [duplicate]

  30 mars 2020, par Embedded

  I’m trying to stream audio input from Seeed Studio 4-Mic-Array Respeaker on desired IP address and port on Raspberry Pi 4.

  Command that I’m using is :

  ffmpeg -re -f alsa -i hw:1,0 -ac 4 -ar 16000 -f rtp rtp://10.0.0.1:1234

  Error I’m getting is :

  cannot set sample format 0x10000 2 (Invalid argument)

  Result from arecord --dump-hw-params -D hw:1,0 command is :

  Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
  
  HW Params of device "hw:1,0":
  
  --------------------
  
  ACCESS:  MMAP_INTERLEAVED RW_INTERLEAVED
  
  FORMAT:  S32_LE
  
  SUBFORMAT:  STD
  
  SAMPLE_BITS: 32
  
  FRAME_BITS: 128
  
  CHANNELS: 4
  
  RATE: [8000 48000]
  
  PERIOD_TIME: (333 2048000]
  
  PERIOD_SIZE: [16 16384]
  
  PERIOD_BYTES: [256 262144]
  
  PERIODS: [2 2048]
  
  BUFFER_TIME: (666 4096000]
  
  BUFFER_SIZE: [32 32768]
  
  BUFFER_BYTES: [512 524288]
  
  TICK_TIME: ALL
  
  --------------------
  
  arecord: set_params:1299: Sample format non available
  
  Available formats:
  
  - S32_LE