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• FFmpeg still running but don't render HLS file in WPF application [closed]

  22 octobre 2020, par anhpt233

  I had apply ffmpeg to my wpf app with C# for live streaming and split it for upload to the server. But I has a problem with this command. It's will stop render hls file after more than 30m. And when I check process in task manager, ffmpeg.exe still running with 0% CPU and memory.

  


  I had change "preset" to "ultrafast" and config "rtbufsize" is 100M, but it's can't resolve this problem.

  


  I think maybe the client was out-of-memory, not sure. But I don't know how optimal or fix this issue. Anybody can help me ? Thanks so much !

  


  Here is my code :

  


  ffmpeg -f dshow -framerate 30 -i video="Logitech HD Webcam C270":audio="Microphone (HD Webcam C270)" -y - rtbufsize 100M - f gdigrab - framerate 30 - probesize 10M - draw_mouse 1 - i desktop -filter_complex  "nullsrc = size = 1440*480 [base];[0:v]setpts = PTS - STARTPTS ,scale = 720*480 [upperleft] ; [1:v]setpts = PTS - STARTPTS,scale = 720*480 [upperright];[base][upperleft]overlay = shortest = 1:x = 0:y = 0[tmp1];[tmp1][upperright]overlay = shortest = 1:x = 720:y = 0" -c:v libx264 -crf 23 -force_key_frames "expr: gte(t, n_forced * 2)" -preset veryfast -tune zerolatency -pix_fmt yuv422p -f hls -hls_time 4 -hls_playlist_type vod -start_number 0 -hls_segment_filename index%d.ts 480p.m3u8


  


• OpenCV ffmpeg issues when running Windows 10 app on Windows 7

  1er novembre 2016, par David G.

  I need to maintain a desktop app written in C++, using Qt and OpenCV for some video processing. As far as I understood, the decoding part of OpenCV is delegated to ffmpeg in a separate DLL for licensing reasons.

  The development environment is on Windows 10, using QT Creator and MSVC12 64-bit as compiler. OpenCV version is 3.0, the official distribution. Here, everything runs fine, I am able to decode a video using VideoCapture::open().

  Issues arise when I try to run the application in a standalone fashion with all the required DLLs in the same folder as the .exe file. All cases below are 64-bit OSes.

  On a Windows 10 computer, not the same as the developement machine and no developer libraries present, the video decoding works fine. I have tested on a Windows 8 machine as well, no issues so far.

  On Windows 7, the things get tricky. The same video files that successfully load during the previous tests are not recognized by the app at all i.e. the isOpened call on VideoCapture returns false. For further testing, I stripped the opencv_ffmpeg300_64.dll file to narrow down the issue on Windows 10 and 8 ; as expected, without this DLL the app is no more able to open the same video files.

  It seems that the DLL is simply not recognized on Windows 7.

  • Did you encounter this type of issue and, maybe, have part of a solution ?
  • I would like to monitor which DLLs are loaded as the program runs and see possible "DLL not found" errors. Is it possible, especially on a machine that does not have the entire developement environment ?
  • Can building OpenCV on my own address the issue ?
  • Even further, would it be worth to port the development environment on Windows 7 and build from there ? This requires significant work due to the project itself.

• Fatal signal 11 (SIGSEGV) at 0x00000010 (code=1) while running android ffmpeg comand

  10 février 2015, par Dinesh Raj

  There is no problem while running this code for first time,after opening the app.

  String path=Environment.getExternalStorageDirectory().toString();                                           
  
  final String[]  complexCommand = {"-y","-r", "1/5" , "-i",path+"/slideshow/img%d.jpg","-acodec", "copy stream" ,path+"/Movies/vid.mp4"};

  log while running the ffmpeg command first time in android.

  02-11 18:32:06.289: D/Videokit(13426): Opening an output file: /storage/sdcard0/Movies/2015_02_11_18_32_06.mp4.
  
  02-11 18:32:06.299: D/Videokit(13426): Successfully opened the file.
  
  02-11 18:32:06.389: I/Videokit(13426): Stream mapping:
  
  02-11 18:32:06.389: I/Videokit(13426):   Stream #0:0 -> #0:0
  
  02-11 18:32:06.389: I/Videokit(13426):  (mjpeg -> mpeg4)
  
  02-11 18:32:06.389: I/Videokit(13426): Press [q] to stop, [?] for help
  
  02-11 18:32:06.419: V/Videokit(13426): No more output streams to write to, finishing.
  
  02-11 18:32:06.419: I/Videokit(13426): frame=    1 fps=0.0 q=2.8 Lsize=       7kB time=00:00:02.00 bitrate=  30.5kbits/s    
  
  02-11 18:32:06.429: I/Videokit(13426): video:7kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead 11.628588%
  
  02-11 18:32:06.429: D/Videokit(13426): 1 frames successfully decoded, 0 decoding errors
  
  02-11 18:32:06.429: I/Videokit(13426): Main ended with status 0

  But without closing the app , if i run this ffmpeg command second time getting this error, after opening an output file

  Opening an output file: /storage/sdcard0/Movies/2015_02_11_18_35_29.mp4.
  
  Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 13741 (v.env.slideshow)