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• FFmpeg-Invalid PNG signature,Error while decoding stream,Invalid data found when processing input

  27 octobre 2018, par Bhuvnesh Varma

  I am using below ffmpeg command to convert images to video-

  "-y", "-f", "concat", "-safe", "0", "-i", src.getAbsolutePath(),
  "-vsync", "vfr", "-vf",
  "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720 :(ow-iw)/2 :(oh-ih)/2,format=yuv420p",
  dest.getAbsolutePath()

  But sometimes I get below failure error-

  Invalid PNG signature 0x21F904050A000400.\nError while decoding stream
  Invalid data found when processing input\n[png @ 0xf0fec400] Invalid
  PNG signature

  Complete error

  ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers\n
  built with gcc 4.8 (GCC)\n configuration : —target-os=linux
  —cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-
  —arch=arm —cpu=cortex-a8 —enable-runtime-cpudetect —sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot
  —enable-pic —enable-libx264 —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —enable-fontconfig —enable-pthreads —disable-debug —disable-ffserver —enable-version3 —enable-hardcoded-tables —disable-ffplay —disable-ffprobe —enable-gpl —enable-yasm —disable-doc —disable-shared —enable-static —pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config —prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a —extra-cflags=’-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include
  -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all’ —extra-ldflags=’-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib
  -Wl,-z,relro -Wl,-z,now -pie’ —extra-libs=’-lpng -lexpat -lm’ —extra-cxxflags=\n libavutil 55. 17.103 / 55. 17.103\n libavcodec 57. 24.102 / 57. 24.102\n libavformat 57. 25.100 /
  57. 25.100\n libavdevice 57. 0.101 / 57. 0.101\n libavfilter 6. 31.100 / 6. 31.100\n libswscale 4. 0.100 / 4. 0.100\n libswresample 2. 0.101 / 2. 0.101\n libpostproc 54. 0.100 /
  54. 0.100\nInput #0, concat, from ’/storage/emulated/0/Movies/videoffmeg.txt’ :\n Duration : N/A, start :
  0.000000, bitrate : N/A\n Stream #0:0 : Video : png, rgb24(pc), 1080x1920, 25 tbr, 25 tbn, 25 tbc\n[libx264 @ 0xf0feb000] using cpu
  capabilities : none !\n[libx264 @ 0xf0feb000] profile High, level
  3.1\n[libx264 @ 0xf0feb000] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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 fast_pskip=1 chroma_qp_offset=-2
  threads=12 lookahead_threads=2 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 keyint=250
  keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
  mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
  aq=1:1.00\nOutput #0, mp4, to
  ’/storage/emulated/0/Movies/slideshow_video.mp4’ :\n Metadata :\n
  encoder : Lavf57.25.100\n Stream #0:0 : Video : h264
  (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720, q=-1—1, 25
  fps, 12800 tbn, 25 tbc\n Metadata :\n encoder :
  Lavc57.24.102 libx264\n Side data :\n unknown side data type 10
  (24 bytes)\nStream mapping :\n Stream #0:0 -> #0:0 (png (native) ->
  h264 (libx264))\nPress [q] to stop, [?] for help\n[png @ 0xf0feb800]
  Invalid PNG signature 0x474946383961F401.\n[png @ 0xf0febc00] Invalid
  PNG signature 0x21F904050A000400.\n[png @ 0xf0fec000] Invalid PNG
  signature 0x21F904050A000400.\n[png @ 0xf0fec400] Invalid PNG
  signature 0x21F904050A000400.\n[png @ 0xf0fec800] Invalid PNG
  signature 0x21F904050A000400.\n[png @ 0xf0fecc00] Invalid PNG
  signature 0x21F904050A000400.\n[png @ 0xf0aff000] Invalid PNG
  signature 0x21F904050A000400.\nError while decoding stream #0:0 :
  Invalid data found when processing input\n[png @ 0xf0feb400] Invalid
  PNG signature 0x21F904050A000400.\nError while decoding stream #0:0 :
  Invalid data found when processing input\n[png @ 0xf0feb800] Invalid
  PNG signature 0x21F904050A000400.\nError while decoding stream #0:0 :
  Invalid data found when processing input\n[png @ 0xf0febc00] Invalid
  PNG signature 0x21F904050A000400.\nError while decoding stream #0:0 :
  Invalid data found when processing input\n[png @ 0xf0fec000] Invalid
  PNG signature 0x21F904050A000400.\nError while decoding stream #0:0 :
  Invalid data found when processing input\n[png @ 0xf0fec400] Invalid
  PNG signature 0x21F904050A000400. input\n[png @ 0xf0aff000] Invalid
  PNG signature 0x21F904050A000200.\nError while decoding stream #0:0 :
  Invalid data found when processing input\n[png @ 0xf0feb400] Invalid
  PNG signature 0x21F904050A000200.\nError while decoding stream #0:0 :
  Invalid data found when processing input\n[png @ 0xf0feb800] Invalid
  PNG signature 0x21F904050A000200.\nError while decoding stream #0:0 :
  Invalid data found when processing input\nframe= 1 fps=0.0 q=28.0
  Lsize= 26kB time=00:00:00.04 bitrate=5366.4kbits/s speed=0.0635x
  \nvideo:25kB audio:0kB subtitle:0kB other streams:0kB global
  headers:0kB muxing overhead : 3.073141%\n[libx264 @ 0xf0feb000] frame
  I:1 Avg QP:31.22 size : 25356\n[libx264 @ 0xf0feb000] mb I
  I16..4 : 5.9% 79.7% 14.5%\n[libx264 @ 0xf0feb000] 8x8 transform
  intra:79.7%\n[libx264 @ 0xf0feb000] coded y,uvDC,uvAC intra : 22.3%
  26.6% 14.1%\n[libx264 @ 0xf0feb000] i16 v,h,dc,p : 33% 12% 27% 28%\n[libx264 @ 0xf0feb000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu : 41% 4% 47%
  2% 1% 2% 1% 2% 1%\n[libx264 @ 0xf0feb000] i4
  v,h,dc,ddl,ddr,vr,hd,vl,hu : 28% 23% 13% 6% 6% 7% 7% 5%
  5%\n[libx264 @ 0xf0feb000] i8c dc,h,v,p : 81% 7% 9% 3%\n[libx264 @
  0xf0feb000] kb/s:5071.20\nConversion failed !\n

  By what I understand is that there might be some image file which can be corrupt which causes ffmpeg to fail in creating video from images.Is there any way FFmpeg can ignore that corrupt image file and create video from other image files ? Is there any change i can make in command to prevent this failure ?

• How to get the output resolution after successful encode ?

  11 janvier 2021, par Daniel Birowsky Popeski

  I'm using fluent-ffmpeg and I'm already able to get the output resolution in the 'on end' event :

  


  createFfmpegCommand()
  .input(fs.createReadStream(readPath))
  .noAudio()
  .fps(30)
  .format('mp4')
  .videoCodec('libx264')
  .videoFilter([
   {filter: 'scale', options: '1920:1920:force_original_aspect_ratio=decrease'},
   {filter: 'setpts', options: '1.5*PTS'},
  ])
  .outputOption('-crf 30')
  .outputOption('-movflags frag_keyframe')
  .outputOption('-movflags +faststart')
  .output(mp4WriteStream)
  .on('start', () => console.log('processing started'))
  .on('error', err => console.error('err', err))
  .on('end', (_,res) => console.log('processing success',res))
  .run();


  


  However, i'd like it to be machine-readable (json or xml). Instead, it looks like this :

  


   ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_8 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2020-05-28T09:51:18.000000Z
  Duration: 00:00:02.23, start: 0.000000, bitrate: N/A
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9108 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2020-05-28T09:51:18.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
[libx264 @ 0x7f92d9808e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7f92d9808e00] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0x7f92d9808e00] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - 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 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 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 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=30.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'pipe:1':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    encoder         : Lavf58.45.100
    Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
    Metadata:
      creation_time   : 2020-05-28T09:51:18.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=   64 fps=0.0 q=36.0 size=       0kB time=00:00:00.16 bitrate=   1.7kbits/s dup=21 drop=0 speed=0.316x    
frame=  100 fps=0.0 q=-1.0 Lsize=     108kB time=00:00:03.23 bitrate= 274.7kbits/s dup=33 drop=0 speed=3.25x    
video:106kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.906519%
[libx264 @ 0x7f92d9808e00] frame I:1     Avg QP:25.71  size:  8782
[libx264 @ 0x7f92d9808e00] frame P:25    Avg QP:30.10  size:  2308
[libx264 @ 0x7f92d9808e00] frame B:74    Avg QP:27.92  size:   564
[libx264 @ 0x7f92d9808e00] consecutive B-frames:  1.0%  0.0%  3.0% 96.0%
[libx264 @ 0x7f92d9808e00] mb I  I16..4: 19.4% 77.2%  3.3%
[libx264 @ 0x7f92d9808e00] mb P  I16..4:  0.3%  0.8%  0.1%  P16..4:  4.6%  1.3%  0.4%  0.0%  0.0%    skip:92.5%
[libx264 @ 0x7f92d9808e00] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  4.0%  0.2%  0.0%  direct: 0.0%  skip:95.7%  L0:44.2% L1:54.8% BI: 1.0%
[libx264 @ 0x7f92d9808e00] 8x8 transform intra:75.0% inter:78.3%
[libx264 @ 0x7f92d9808e00] coded y,uvDC,uvAC intra: 8.8% 8.8% 2.4% inter: 0.3% 0.2% 0.0%
[libx264 @ 0x7f92d9808e00] i16 v,h,dc,p: 77%  7% 10%  6%
[libx264 @ 0x7f92d9808e00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 48%  3% 42%  1%  1%  1%  1%  1%  1%
[libx264 @ 0x7f92d9808e00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 16% 26%  7%  4%  4%  3%  5%  6%
[libx264 @ 0x7f92d9808e00] i8c dc,h,v,p: 89%  5%  5%  1%
[libx264 @ 0x7f92d9808e00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7f92d9808e00] ref P L0: 66.9% 11.1% 16.7%  5.3%
[libx264 @ 0x7f92d9808e00] ref B L0: 87.5%  9.9%  2.6%
[libx264 @ 0x7f92d9808e00] ref B L1: 96.4%  3.6%
[libx264 @ 0x7f92d9808e00] kb/s:259.80


  


  Which doesn't let me be comfortable that my regex to extract the output resolution is always going to work.

  


  Also, I don't wanna make another call/fileread just to get the resolution. Mainly because my files are stored in S3, where ffprobe doesn't work.

  


• ffmpeg : Command Execution failed

  29 janvier 2019, par PRABHJOT SINGH

  I am using this plugin plugin link and I am uploading mp4 videos and trying to compress the video on the server using node js FFmpeg module

  var vid = new ffmpeg( './' + req.file_name + '.mp4');
  
  vid.then(function (video) {
  
      video.setVideoSize('640x?', true, true)
  
          .save('./' + req.file_name + '_cp.mp4',
  
              function (err,file) {
  
                  if(err) {
  
                      res.send({status: 404, message: 'Unable to save video' })
  
                  } else {
  
                      revealCtrl.GetVideoData(req, res, next);
  
                  }
  
              })
  
  }, function (err) { });

  but it is not compressing my video and gives this error

  Here is the final command

  Command failed: ffmpeg -i ./jrbze37i.mp4  -strict -2  -filter_complex "scale=iw*sar:ih, pad=max(iw\,ih*(16/9)):ow/(16/9):(ow                                                                                                        -iw)/2:(oh-ih)/2" ./jrbze37i_cp.mp4 

  and here is the error

  Error: Command failed: ffmpeg -i ./jrbze37i.mp4  -strict -2  -filter_complex "scale=iw*sar:ih, pad=max(iw\,ih*(16/9)):ow/(16/9):(ow                                                                                                        -iw)/2:(oh-ih)/2" ./jrbze37i_cp.mp4
  
  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg 
  
  developers
  
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build- 
  
  suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-                                                                                                        
  
  linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ -- 
  
  enable-gpl --enable-shared --disable-stripping --disable-decoder                                                                                                        
  
  =libopenjpeg --disable-decoder=libschroedinger --enable-avresample -- 
  
  enable-avisynth --enable-gnutls --enable-ladspa --enable-libass                                                                                                         
  
  --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio -- 
  
  enable-libflite --enable-libfontconfig --enable-libfreetype -                                                                                                        
  
  -enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug -- 
  
  enable-libmp3lame --enable-libopenjpeg --enable-libopus --en                                                                                                        
  
  able-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine 
  
  --enable-libsnappy --enable-libsoxr --enable-libspeex --ena                                                                                                        
  
  ble-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis -- 
  
  enable-libvpx --enable-libwavpack --enable-libwebp --enable-li                                                                                                        
  
  bx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl -- 
  
  enable-x11grab --enable-libdc1394 --enable-libiec61883 --en                                                                                                        
  
  able-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
  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, mov,mp4,m4a,3gp,3g2,mj2, from './jrbze37i.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf58.26.100
  
  Duration: 00:00:53.22, start: 0.023220, bitrate: 1553 kb/s
  
  Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), 
  
  yuv420p, 1920x1080, 1418 kb/s, 30 fps, 30 tbr, 15360 tb                                                                                                        
  
  n, 60 tbc (default)
  
  Metadata:
  
    handler_name    : Core Media Video
  
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, 
  
  fltp, 128 kb/s (default)
  
  Metadata:
  
    handler_name    : Core Media Audio
  
  [libx264 @ 0x1567760] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 
  
  AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x1567760] profile High, level 4.0
  
  [libx264 @ 0x1567760] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC 
  
  codec - Copyleft 2003-2015 - 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 tr                                                                                                        
  
  ellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 
  
  threads=1 lookahead_threads=1 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 ke                                                                                                        
  
  yint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf 
  
  mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_r                                                                                                        
  
  atio=1.40 aq=1:1.00
  
  Output #0, mp4, to './jrbze37i_cp.mp4':
  
    Metadata:
  
   major_brand     : isom
  
   minor_version   : 512
  
   compatible_brands: isomiso2avc1mp41
  
   encoder         : Lavf56.40.101
  
   Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 
  
     1920x1080, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
  
   Metadata:
  
    encoder         : Lavc56.60.100 libx264
  
   Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, 
  
   fltp, 128 kb/s (default)
  
   Metadata:
  
    handler_name    : Core Media Audio
  
    encoder         : Lavc56.60.100 aac
  
   Stream mapping:
  
     Stream #0:0 (h264) -> scale (graph 0)
  
     pad (graph 0) -> Stream #0:0 (libx264)
  
     Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
     Press [q] to stop, [?] for help
  
     Killed   42 fps=5.1 q=29.0 size=      94kB time=00:00:01.34 bitrate= 
  
      574.7kbits/s dup=1 drop=0
  
  
  
     at ChildProcess.exithandler (child_process.js:276:12)
  
     at emitTwo (events.js:126:13)
  
     at ChildProcess.emit (events.js:214:7)
  
     at maybeClose (internal/child_process.js:915:16)
  
     at Socket.stream.socket.on (internal/child_process.js:336:11)
  
     at emitOne (events.js:116:13)
  
     at Socket.emit (events.js:211:7)
  
     at Pipe._handle.close [as _onclose] (net.js:561:12)
  
   killed: false,
  
   code: 137,
  
   signal: null,
  
   cmd: 'ffmpeg -i ./jrbze37i.mp4  -strict -2  -filter_complex 
  
      "scale=iw*sar:ih, pad=max(iw\\,ih*(16/9)):ow/(16/9):(ow-iw)/2:(oh- 
  
     ih)/2 " ./jrbze37i_cp.mp4'

  My problem is that sometimes its work or sometimes it doesn’t work.