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• "Could not demultiplex stream" in loading Video recorded by Opencv's VideoWriter

  21 novembre 2020, par batuman

  My program is

  



  int main(){&#xA;    cout &lt;&lt; "Start the process" &lt;&lt; endl;&#xA;    cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");&#xA;    cout &lt;&lt; "Camera connection done!" &lt;&lt; endl;&#xA;    cv::Mat image, small;&#xA;    //Output video&#xA;    cv::Size S = cv::Size((int) vcap.get(CV_CAP_PROP_FRAME_WIDTH), (int) vcap.get(CV_CAP_PROP_FRAME_HEIGHT));&#xA;    int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));&#xA;    int fps = vcap.get(CV_CAP_PROP_FPS);&#xA;    cout &lt;&lt; "fps " &lt;&lt; fps &lt;&lt; " ex " &lt;&lt; ex &lt;&lt; endl;&#xA;    cv::VideoWriter outputVideo;&#xA;    outputVideo.open("TEST.avi", ex/*CV_FOURCC(&#x27;X&#x27;, &#x27;2&#x27;, &#x27;6&#x27;, &#x27;4&#x27;)*/, vcap.get(CV_CAP_PROP_FPS), S, true);&#xA;    if(!outputVideo.isOpened()){&#xA;        cout &lt;&lt; "Could not open the output video for write" &lt;&lt; endl;&#xA;        return -1;&#xA;    }&#xA;&#xA;    for(;;){&#xA;        if(!vcap.read(image)){&#xA;            std::cout &lt;&lt; "No frame" &lt;&lt; std::endl;&#xA;            cv::waitKey(0);&#xA;        }&#xA;&#xA;        cv::resize(image, small, image.size()/2, 0, 0 , cv::INTER_LINEAR);&#xA;        cv::imshow("Display", small);&#xA;        cv::waitKey(1);&#xA;        outputVideo.write(small);&#xA;        if(getkey() == &#x27;\n&#x27;)&#xA;            break;&#xA;    }&#xA;    cout &lt;&lt; "Camera release" &lt;&lt; endl;&#xA;    outputVideo.release();&#xA;    vcap.release();&#xA;    image.release();&#xA;    small.release();&#xA;    return 0;&#xA;}&#xA;</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 ?

  


• audio/mp4 ; codecs="mp4a.40.2" not playing in Chrome and Firefox

  19 octobre 2020, par Stefan Falk

  It 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/aac as 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

  


  


• When I run ffmpeg Im getting "output file #0 does not contain any stream" [duplicate]

  29 novembre 2020, par 0 day

  Im trying to feed live stream from ffmpeg to ffserver but Im getting this error

  


    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
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1606657336.654899, bitrate: N/A
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1680x1050, 25 fps, 24.92 tbr, 1000k tbn, 1000k tbc
Output #0, alsa, to 'http://localhost:8090/feed.ffm':
Output file #0 does not contain any stream


  


  here is my cli

  


  ffmpeg -probesize 1000M -framerate 25 -video_size 1680x1050 -f x11grab -i :0.0 -f alsa -c:a aac -vf format=yuv420p http://localhost:8090/feed1.ffm


  


  I'v looked at this and this but it did not helped

  


  How can I fix

  


  Output file #0 does not contain any stream

  


  EDIT :

  


  ffmpeg -probesize 1000M -framerate 25 -video_size 1680x1050 -f x11grab -i :0.0 -f alsa -i default -c:a aac -vf format=yuv420p http://localhost:8090/feed1.ffm
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers

Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1606679309.355016, bitrate: N/A
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1680x1050, 25 fps, 24.92 tbr, 1000k tbn, 1000k tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'default':
  Duration: N/A, start: 1606679310.190079, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #1:0 -> #0:0 (pcm_s16le (native) -> mp2 (native))
  Stream #0:0 -> #0:1 (rawvideo (native) -> mpeg1video (native))
  Stream #0:0 -> #0:2 (rawvideo (native) -> vp8 (libvpx))
Press [q] to stop, [?] for help
[x11grab @ 0x561e2391da00] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[mpeg1video @ 0x561e23968400] bitrate tolerance 21333 too small for bitrate 64000, overriding
[mpeg1video @ 0x561e23968400] MPEG-1/2 does not support 3/1 fps
Error initializing output stream 0:1 -- Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height
[alsa @ 0x561e23926c40] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
Conversion failed!