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The pirate bay depuis la Belgique
1er avril 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Image
Autres articles (97)
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Sur d’autres sites (14711)
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Getting "OSError : [Errno 32] Broken pipe" while saving a numpy array using imageio.mimwrite into io.BytesIO() object
10 novembre 2020, par green_hunter434I am trying to save a numpy array (array of frames) as a video using imageio.mimwrite .


Operation like this works fine -


imageio.mimwrite('./temp4.mp4', frames, fps=fps, format='.mp4')


But, when I try something like this -


fo = io.BytesIO()
imageio.mimwrite(fo, frames, fps=fps, format='.mp4')


OR


writer = imageio.get_writer(fo, fps=fps, format='.mp4')

for im in frames:
 writer.append_data(imageio.imread(im))
writer.close()


I get the following error -


---------------------------------------------------------------------------
BrokenPipeError Traceback (most recent call last)
c:\program files (x86)\python38-32\lib\site-packages\imageio_ffmpeg\_io.py in write_frames(path, size, pix_fmt_in, pix_fmt_out, fps, quality, bitrate, codec, macro_block_size, ffmpeg_log_level, ffmpeg_timeout, input_params, output_params)
 478 try:
--> 479 p.stdin.write(bb)
 480 except Exception as err:

BrokenPipeError: [Errno 32] Broken pipe

During handling of the above exception, another exception occurred:

OSError Traceback (most recent call last)
 in <module>
 1 for im in ret3:
----> 2 writer.append_data(im)
 3 writer.close()

c:\program files (x86)\python38-32\lib\site-packages\imageio\core\format.py in append_data(self, im, meta)
 500 im = asarray(im)
 501 # Call
--> 502 return self._append_data(im, total_meta)
 503 
 504 def set_meta_data(self, meta):

c:\program files (x86)\python38-32\lib\site-packages\imageio\plugins\ffmpeg.py in _append_data(self, im, meta)
 572 
 573 # Write. Yes, we can send the data in as a numpy array
--> 574 self._write_gen.send(im)
 575 
 576 def set_meta_data(self, meta):

c:\program files (x86)\python38-32\lib\site-packages\imageio_ffmpeg\_io.py in write_frames(path, size, pix_fmt_in, pix_fmt_out, fps, quality, bitrate, codec, macro_block_size, ffmpeg_log_level, ffmpeg_timeout, input_params, output_params)
 484 "OUTPUT:\n".format(err, cmd_str)
 485 )
--> 486 raise IOError(msg)
 487 
 488 nframes += 1

OSError: [Errno 32] Broken pipe

FFMPEG COMMAND:
c:\program files (x86)\python38-32\lib\site-packages\imageio_ffmpeg\binaries\ffmpeg-win32-v4.2.2.exe -y -f rawvideo -vcodec rawvideo -s 256x256 -pix_fmt rgb24 -r 29.97 -i - -an -vcodec libx264 -pix_fmt yuv420p -crf 25 -v warning C:\Users\pramu\AppData\Local\Temp\imageio_fh1fqkgc

FFMPEG STDERR OUTPUT:
</module>

I get the same error using anaconda ffmpeg and non-anaconda ffmpeg.


Is there a way to fix this error ?


Also, is there a better way to convert list of frames into .mp4 or serializing it for sending through an API ?.


Thank you !


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"Could not demultiplex stream" in loading Video recorded by Opencv's VideoWriter
21 novembre 2020, par batumanMy program is



int main(){
 cout << "Start the process" << endl;
 cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");
 cout << "Camera connection done!" << endl;
 cv::Mat image, small;
 //Output video
 cv::Size S = cv::Size((int) vcap.get(CV_CAP_PROP_FRAME_WIDTH), (int) vcap.get(CV_CAP_PROP_FRAME_HEIGHT));
 int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));
 int fps = vcap.get(CV_CAP_PROP_FPS);
 cout << "fps " << fps << " ex " << ex << endl;
 cv::VideoWriter outputVideo;
 outputVideo.open("TEST.avi", ex/*CV_FOURCC('X', '2', '6', '4')*/, vcap.get(CV_CAP_PROP_FPS), S, true);
 if(!outputVideo.isOpened()){
 cout << "Could not open the output video for write" << endl;
 return -1;
 }

 for(;;){
 if(!vcap.read(image)){
 std::cout << "No frame" << std::endl;
 cv::waitKey(0);
 }

 cv::resize(image, small, image.size()/2, 0, 0 , cv::INTER_LINEAR);
 cv::imshow("Display", small);
 cv::waitKey(1);
 outputVideo.write(small);
 if(getkey() == '\n')
 break;
 }
 cout << "Camera release" << endl;
 outputVideo.release();
 vcap.release();
 image.release();
 small.release();
 return 0;
}
</int>


int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));</int>ex is 0 here.


I can record the TEST.avi, but can't be read by cv::VideoCapture vcap("TEST.avi") ; or VLC player or Videos in Ubuntu.
The error is
"Could not demultiplex stream".


If I changed to



outputVideo.open("TEST.avi", CV_FOURCC('X', '2', '6', '4'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('P','I','M','1'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('M', 'P', '4', '2'), vcap.get(CV_CAP_PROP_FPS), S, true);
etc.



all have same problem.



If I set



outputVideo.open("TEST.avi", CV_FOURCC('i', 'Y', 'U', 'V'), vcap.get(CV_CAP_PROP_FPS), S, true);



I have error as
Opencv: FFMPEG iYUV is not supported with codec id 14


For



outputVideo.open("TEST.avi", CV_FOURCC('M', 'J', 'P', 'G'), vcap.get(CV_CAP_PROP_FPS), S, true);


OpenCV Error: Assertion failed (img.cols == width && img.rows == height && chann
els == 3) in write, file /home/Softwares/opencv/opencv/modules/videoio/src/
cap_mjpeg_encoder.cpp, line 829
terminate called after throwing an instance of 'cv::Exception'
 what(): /home/Softwares/opencv/opencv/modules/videoio/src/cap_mjpeg_enco
der.cpp:829: error: (-215) img.cols == width && img.rows == height && channels =
= 3 in function write



What could be wrong ? Is that my FFMPEG has problem ?


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audio/mp4 ; codecs="mp4a.40.2" not playing in Chrome and Firefox
19 octobre 2020, par Stefan FalkIt seems I want to convert audios, which I want to stream on my website, to
audio/mp4; codecs="mp4a.40.2".

Using
ffmpeg-cli-wrapper, I am converting my uploaded audio files with this command here :

ffmpeg -i /tmp/input.any -acodec aac -b:a 256000 /tmp/output.aac


On the client I am creating a SourceBuffer like this :


this.sourceBuffer = this.mediaSource.addSourceBuffer('audio/mp4; codecs="mp4a.40.2"');


The errors are :


Chrome :


NotSupportedError: Failed to load because no supported source was found.


Firefox :


NotSupportedError: The media resource indicated by the src attribute or assigned media provider object was not suitable.


Here comes the fun part :


If I create the SourceBuffer using
audio/aacas mime-type :

this.sourceBuffer = this.mediaSource.addSourceBuffer('audio/aac');


the audio gets played correctly on Chrome but Firefox says :


MediaSource.addSourceBuffer: Type not supported in MediaSource



Update


After changing the command to


ffmpeg -i /tmp/input.any -acodec aac -b:a 256000 /tmp/output.mp4
 ^^^ 


Chrome/Firefox do not give an error when using
audio/mp4; codecs="mp4a.40.2", but the audio is not being played.


See


- 

- https://stackoverflow.com/a/64432478/826983




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