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• show processing sign in react native app

  26 mai 2018, par Parkash Sbd

  I have a react native app and users upload media(pictures and videos) .I also have RESTful api written in spring boot and its purpose is to accept multipart file and resize the media using FFmpeg.My question is how to show processing sign with percent in react native app while ffmpeg is resizing the media.
  Thanks.

• OSError : [Errno 2] No such file or directory - code worked on new computer doesnt work on old one

  9 mars 2016, par Natasha Hoherchak

  I wrote a script to extract frames from a database I have stored on my computer desktop. I wrote the code on a different computer (new macbook pro 2016) as my computer’s harddrive died. I was finally able to restore my computer (and therefore returned the new computer I wrote the code on).

  I am trying to run the same script, completely unchanged and I keep getting this error : (The line btwn ** ATTENTION** is the printed command line.)

  --------------------------**********ATTENTION**********-------------------------
  
  ffmpeg -i /Desktop/UCF101/v_BaseballPitch_g01_c01.avi -ss 00:00:00.0 -vframes 1 BPout0.png
  
  --------------------------**********ATTENTION**********-------------------------
  
  Traceback (most recent call last):
  
    File "./Desktop/processing.py", line 50, in <module>
  
      processvideo('/Desktop/UCF101/v_BaseballPitch_g01_c01.avi')
  
    File "./Desktop/processing.py", line 47, in processvideo
  
      sp.check_output(args) #was cmdline
  
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 568, in check_output
  
      process = Popen(stdout=PIPE, *popenargs, **kwargs)
  
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 711, in __init__
  
      errread, errwrite)
  
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1308, in _execute_child
  
      raise child_exception
  
  OSError: [Errno 2] No such file or directory
  
  </module>

  Everything is in the same place as it was on the new computer where it was able to run successfully. Does anyone have any idea what it could be ? Could my version of python have anything to do with it ? Could it be a larger issue on my computer ? Any tips for debugging whats caused this error ? I’ve already printed the command (matches perfectly), used shlex.split("mycommandline"), checked my current directory in the script...

• How to convert raw .avi to .yuv through command line (YUV420) ?

  27 février 2016, par Natures Wrath

  I have tried the following command to no avail :

  ffmpeg -i in.avi -vcodec rawvideo -pix_fmt yuv420p out.yuv

  I have a raw avi file (which plays video on vlc). I then take .yuv file. I then tried this command :

  ffmpeg -i in.avi -c:v rawvideo -pix_fmt yuv420p out.yuv

  Still, no luck. I am at a loss as to why my output .yuv file is incorrect. I have a sneaking suspicion that my yuv is not being given the proper headers during this conversion.

  Does anyone know what I can do to get a proper .yuv file from a raw .avi (which I have confirmed is playable on vlc) ?

  Output from second command : (please note that "out.avi" is actually my in.avi from above two commands)

      ffmpeg version 2.8.6 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8.6 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, avi, from 'out.avi':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
    Duration: 00:01:13.16, start: 0.000000, bitrate: 104602 kb/s
  
      Stream #0:0: Video: huffyuv (HFYU / 0x55594648), yuv422p, 1280x720, 104653 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Output #0, rawvideo, to 'fin.yuv':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc56.60.100 rawvideo
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (huffyuv (native) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  frame=  124 fps=0.0 q=-0.0 size=  167400kB time=00:00:04.96 bitrate=276480.0kbits/s dup=1 drop=0   frame=  250 fps=249 q=-0.0 size=  337500kB time=00:00:10.00 bitrate=276480.0kbits/s dup=1 drop=0   frame=  372 fps=247 q=-0.0 size=  502200kB time=00:00:14.88 bitrate=276480.0kbits/s dup=1 drop=0   frame=  497 fps=247 q=-0.0 size=  670950kB time=00:00:19.88 bitrate=276480.0kbits/s dup=1 drop=0   frame=  621 fps=247 q=-0.0 size=  838350kB time=00:00:24.84 bitrate=276480.0kbits/s dup=1 drop=0   frame=  741 fps=246 q=-0.0 size= 1000350kB time=00:00:29.64 bitrate=276480.0kbits/s dup=1 drop=0   frame=  858 fps=244 q=-0.0 size= 1158300kB time=00:00:34.32 bitrate=276480.0kbits/s dup=1 drop=0   frame=  984 fps=245 q=-0.0 size= 1328400kB time=00:00:39.36 bitrate=276480.0kbits/s dup=1 drop=0   frame= 1108 fps=245 q=-0.0 size= 1495800kB time=00:00:44.32 bitrate=276480.0kbits/s dup=1 drop=0   frame= 1232 fps=245 q=-0.0 size= 1663200kB time=00:00:49.28 bitrate=276480.0kbits/s dup=1 drop=0   frame= 1356 fps=246 q=-0.0 size= 1830600kB time=00:00:54.24 bitrate=276480.0kbits/s dup=1 drop=0   frame= 1482 fps=246 q=-0.0 size= 2000700kB time=00:00:59.28 bitrate=276480.0kbits/s dup=1 drop=0   frame= 1606 fps=246 q=-0.0 size= 2168100kB time=00:01:04.24 bitrate=276480.0kbits/s dup=1 drop=0   frame= 1728 fps=246 q=-0.0 size= 2332800kB time=00:01:09.12 bitrate=276480.0kbits/s dup=1 drop=0   frame= 1829 fps=246 q=-0.0 Lsize= 2469150kB time=00:01:13.16 bitrate=276480.0kbits/s dup=1 drop=0    
  
  video:2469150kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
  
  100 taken.