Newest 'ffmpeg' Questions - Stack Overflow

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• How to capture audio in an xvfb system using ffmpeg

  12 juin 2016, par somya bhargava

  Want to capture the audio using ffmpeg Went to this link

  The error coming on the first one is ffmpeg exited with code 1: hw:0: Input/output error

  And the pulse one is running on my laptop but not on the server i think some missing drivers

  ffmpeg exited with code 1: default: No such process

• Killing all child processes

  12 juin 2016, par ErraticFox

  I have written a onclick function that runs child process for a command line for ffmpeg. Though I can't seem to force close or kill the process in the middle of it. I've tried multiple ways such as child.kill() along with SIGINT, SIGKILL, SIGHUP, SIGQUIT, and SIGTERM and it continuously runs in the background still until finished or killed in the task manager. So how can I kill all the process related to the exec?

  Here's my current code:

  function submitBtn() {
      var selectVal1 = $("#inputFile1 option:selected").val(),
          selectVal2 = $("#inputFile2 option:selected").val(),
          selectOpt2 = $("#inputFile2 option:selected").text().toLowerCase()
  
      if (!selectVal1 || !selectVal2) {
          Materialize.toast('Please select your formats', 4000)
      } else if ($("#uploadFile").val() === '') {
          Materialize.toast('Please select your file', 4000)
      } else {
          var process = require("child_process")
          var inputDir = uploadFile.files[0].path
          var dir = inputDir.split("\\")
          var pop = dir.pop()
          var outputDir = dir.join("\\")
          var cmd = `ffmpeg -y -i "${inputDir}" "${outputDir}\\output.${selectOpt2}"`
  
          $("#load").removeClass("disabledLoad")
          func = process.exec(cmd, function(error, stdout, stderr) {})
  
          func.on('exit', function() {
              $("document").ready(function() {
                  $("#load").addClass("disabledLoad")
                  Materialize.toast('Conversion compelete!', 4000)
              })
          })
  
      }
  }
  
  function exitBtn() {
      //var remote = require('electron').remote
      //var window = remote.getCurrentWindow()
      //window.close()
      func.kill()
  }
  

  I even tried renaming process to proc and then doing

      process.on('exit', function () {
      console.log('process is about to exit, kill ffmpeg');
      func.kill()
  })
  

  in exitBtn but still nothing. It doesn't give errors or log my string I put.

• Linux : The man pages about ffmpeg library

  12 juin 2016, par ldkxingzhe

  Just as titile. I want to install man pages about ffmpeg library on linux. when type man "av_register_all", show me the description just as "man printf".

  I know i should put the pages to /usr/local/man. but where is the pages about ffmpeg library

• FFMpeg libswscale XBGR32 to NV12 almost working but colors are wrong

  12 juin 2016, par PhilBot

  I am getting a Linx DMA-BUF from the GPU in XBGR32 format and I need to use FFMpeg's libswscale to convert it on the ARM to NV12.

  I've been able to almost get it working based on various SO posts and the documentation.

  Here is the LCD screen that is the actual output of the GPU:

  Here is the encoded data from the NV12 frame created by libswscale - it should show the same colors as the screen:

  Please note that the pictures were not taken at exactly the same time.

  What am I doing wrong?

  Here is the relevant part of my code:

  /* Prepare to mmap the GBM BO */
  union gbm_bo_handle handleUnion = gbm_bo_get_handle(bo);  
  struct drm_omap_gem_info req;
  req.handle = handleUnion.s32;    
  ret = drmCommandWriteRead(m_DRMController.fd, DRM_OMAP_GEM_INFO,&req, sizeof(req));
  if (ret) {  
      qDebug() << "drmCommandWriteRead(): Cannot set write/read";
  }   
  
  // Perform actual memory mapping of GPU output    
  gpuMmapFrame = (char *)mmap(0, req.size, PROT_READ | PROT_WRITE, MAP_SHARED,m_DRMController.fd, req.offset);
  assert(gpuMmapFrame != MAP_FAILED);
  
  // Use ffmpeg to do the SW BGR32 to NV12   
  static SwsContext *swsCtx = NULL;    
  int width    = RNDTO2( convertWidth );    
  int height   = RNDTO2( convertHeight );    
  int ystride  = RNDTO32 ( width );    
  int uvstride = RNDTO32 ( width / 2 );    
  int uvsize   = uvstride * ( height / 2 );    
  void *plane[] = { y, u, u + uvsize, 0 };    
  int stride[] = { ystride, uvstride, uvstride, 0 };    
  
  // Output of GPU is XBGR32    
  // #define V4L2_PIX_FMT_XBGR32  v4l2_fourcc('X', 'R', '2', '4') /* 32  BGRX-8-8-8-8  */    
  swsCtx = sws_getCachedContext( swsCtx, convertWidth, convertHeight, AV_PIX_FMT_BGR32, width, height, AV_PIX_FMT_NV12, 
                             SWS_FAST_BILINEAR , NULL, NULL, NULL );  
  int linesize[1] = { convertWidth * 4 };    
  const uint8_t *inData[1] = { (uint8_t*)gpuMmapFrame };    
  if ( gpuMmapFrame ) {    
      sws_scale( swsCtx, (const uint8_t *const *)inData, linesize, 0, convertHeight, (uint8_t *const *)plane, stride );    
  }        
  
  // Unmap it    
  munmap(gpuMmapFrame,req.size);
  
  // Now send the frame to the encoder    
  dce.submitFrameToEncode(swEncodeBufferNV12);
  

• Ffmpeg is not always converting correctly

  11 juin 2016, par Lewis Day

  I'm having some problems when I'm using this command to convert video formats It sometimes works and sometimes it doesn't. For .avi files it works for .3gpp only converts audio and for .flv it completely doesn't work is there something that I'm doing wrong basically the $newfilename will only ever be video formats and the output format will always be a .mp4 Thankyou for any help

  ffmpeg -i /path/' . $newfilename . ' -vcodec copy -acodec copy /path/' . $rand . '.mp4'
  

  When I try and convert a .flv to .mp4 this is what is produces

  ffmpeg version 0.10.15 Copyright (c) 2000-2014 the FFmpeg developers
    built on Aug 30 2014 15:49:19 with gcc 4.4.7 20120313 (Red Hat 4.4.7-3)
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffm                      peg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --extra-cflags='-O2 -g -pipe -Wall -Wp,-                      D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --ena                      ble-bzlib --disable-crystalhd --enable-gnutls --enable-libass --enable-libcdio --enable-libcelt --enab                      le-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-op                      enal --enable-libopenjpeg --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspee                      x --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libxvid --enable-x1                      1grab --enable-avfilter --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-                      gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
    libavutil      51. 35.100 / 51. 35.100
    libavcodec     53. 61.100 / 53. 61.100
    libavformat    53. 32.100 / 53. 32.100
    libavdevice    53.  4.100 / 53.  4.100
    libavfilter     2. 61.100 /  2. 61.100
    libswscale      2.  1.100 /  2.  1.100
    libswresample   0.  6.100 /  0.  6.100
    libpostproc    52.  0.100 / 52.  0.100
  Input #0, flv, from '/path/101.flv':
    Metadata:
      starttime       : 0
      totalduration   : 39
      totaldatarate   : 639
      bytelength      : 3096565
      canseekontime   : true
    Duration: 00:00:38.66, start: 0.000000, bitrate: 640 kb/s
      Stream #0:0: Video: flv1, yuv420p, 426x240, 581 kb/s, 30 tbr, 1k tbn, 1k tbc
      Stream #0:1: Audio: mp3, 22050 Hz, stereo, s16, 64 kb/s
  [buffer @ 0x679ce0] w:426 h:240 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  Incompatible sample format 's16' for codec 'aac', auto-selecting format 'flt'
  [libx264 @ 0x679640] using cpu capabilities: none!
  [libx264 @ 0x679640] profile High, level 2.1
  [libx264 @ 0x679640] 264 - core 120 r2151 a3f4407 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http                      ://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7                       psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fas                      t_pskip=1 chroma_qp_offset=-2 threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0                       constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 k                      eyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.6                      0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  [NULL @ 0x682a60] Codec is experimental but experimental codecs are not enabled, see -strict -2
  Output #0, mp4, to 'path/55271313.mp4':
    Metadata:
      starttime       : 0
      totalduration   : 39
      totaldatarate   : 639
      bytelength      : 3096565
      canseekontime   : true
      Stream #0:0: Video: h264, yuv420p, 426x240, q=-1--1, 90k tbn, 30 tbc
      Stream #0:1: Audio: none, 22050 Hz, stereo, flt, 128 kb/s
  Stream mapping:
    Stream #0:0 -> #0:0 (flv -> libx264)
    Stream #0:1 -> #0:1 (mp3 -> aac)
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate                      , width or height