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• How can I know a certain file is a video file ?

  31 mai 2019, par Arthur Park

  I am trying to figure out if a certain user-uploaded file is a video file.

  I first tried ffprobe,

  # a png file
  
  
  
  Input #0, png_pipe, from '<file>':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 920x2094 [SAR 4724:4724 DAR 460:1047], 25 tbr, 25 tbn, 25 tbc
  
  
  
  # a text file
  
  
  
  Input #0, tty, from '<file>':
  
    Duration: 00:00:00.24, bitrate: 40 kb/s
  
      Stream #0:0: Video: ansi, pal8, 640x400, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  
  
  # a video file
  
  
  
  Input #0, matroska,webm, from '<file>':
  
    Metadata:
  
      encoder         : libebml v1.3.5 + libmatroska v1.4.8
  
      creation_time   : 2017-12-12T20:18:42.000000Z
  
    <redacted>
  
  </redacted></file></file></file>

  but it’s too hard to figure out what’s what. Even image files and text files count as a video.

  Should I compare the output matroska,webm, with every codec ffmpeg supports or is there a better way to do this ?

• FFmpeg file path exception like file name not found

  7 février 2018, par Sagar Hudge

  I am getting following exception on video trimming.

  video path : /storage/emulated/0/Pictures/Instagram/Fast & Furious 7 - Get Low Extended Version Video.mp4

  file name : Fast & Furious 7 - Get Low Extended Version Video.mp4

  and ffmpeg searching for only Fast in

  /storage/emulated/0/Pictures/Instagram/Fast: No such file or directory

  I have found the issue ,it is causing due to the file name having spaces in between them you can check in above mentioned path and in exception.

  after changing file name its working but changing name of every file from device its not the right way so how can I solve this exception

  FAILED with output : WARNING: linker: /data/user/0/com.example.SeekBarActivity/files/ffmpeg 
  
  has text relocations. This is wasting memory and prevents security hardening.
  
  Please fix. ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  
  
  
  built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
  
  configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-
  
  android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --
  
  cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-
  
  Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 
  
  --enable-libass --enable-libfreetype --enable-libfribidi --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/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --
  
  prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-
  
  cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -
  
  U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-
  
  all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-
  
   android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-
  
   lpng -lexpat -lm' --extra-cxxflags=
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  1.100 /  5.  1.100
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
    /storage/emulated/0/Pictures/Instagram/Fast: No such file or directory

• FFmpeg could not read existing .bmp frame sequence to make .avi file ; What is wrong ?

  13 mai 2017, par xakepp35

  Assume current directory contains files in .bmp format, named IMG_0000.bmp, IMG_0001.bmp, and so on. I need to make avi file from them, threating them as a frames. FFmpeg gives me an error, and i could not understand what is wrong. I’ve got following error message :

  D:\WORK\MyFrames>"C:\Users\Den\Downloads\ffmpeg-latest-win32-static\ffmpeg-201 30928-git-c461265-win32-static\bin\ffmpeg.exe" -i d:\WORK\MyFrames\IMG_%4d.bmp
  
   -r 4 -vcodec h264 -y out.avi
  
  ffmpeg version N-56715-gc461265 Copyright (c) 2000-2013 the FFmpeg developers built on Sep 28 2013 18:02:00 with gcc 4.8.1 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
  
  cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
  
  ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
  libavutil      52. 46.100 / 52. 46.100
  
  libavcodec     55. 33.101 / 55. 33.101
  
  libavformat    55. 18.104 / 55. 18.104
  
  libavdevice    55.  3.100 / 55.  3.100
  
  libavfilter     3. 88.100 /  3. 88.100
  
  libswscale      2.  5.100 /  2.  5.100
  
  libswresample   0. 17.103 /  0. 17.103
  
  libpostproc    52.  3.100 / 52.  3.100
  
  [image2 @ 022cfa60] Could find no file with path 'd:\WORK\MyFrames\IMG_%4d.bmp
  
  ' and index in the range 0-4
  
  d:\WORK\Serega28-3\IMG_%4d.bmp: No such file or directory