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• ffmpeg At least one output file must be specified error

  13 avril 2022, par insea

  How can i fix this ;( help me....
it works well if i tpye only "'ffmpeg -i ' + video_path + ' -q:v 2 -f image2 ' + frame_path + '\image_%6d.jpg'" on prompt with specific path name.
but it doesn't work in .py (i used code in .py-> os.system('ffmpeg -i ' + video_path + ' -q:v 2 -f image2 ' + frame_path + '\image_%6d.jpg')

  


  '''
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.1 (GCC) 20200726
configuration : —disable-static —enable-shared —enable-gpl —enable-version3 —enable-sdl2 —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libdav1d —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libsrt —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvmaf —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libaom —enable-libgsm —enable-librav1e —disable-w32threads —enable-libmfx —enable-ffnvcodec —enable-cuda-llvm —enable-cuvid —enable-d3d11va —enable-nvenc —enable-nvdec —enable-dxva2 —enable-avisynth —enable-libopenmpt —enable-amf
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
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002629ef05540] stream 0, timescale not set
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'E :\dataset\Videos\Arrest\Arrest007_x264.mp4' :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
track : 0
artist :
album :
date : 0
genre :
lyrics :
title :
encoder : Lavf56.36.100
Duration : 00:01:44.84, start : 0.000000, bitrate : 1499 kb/s
Stream #0:0(und) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 1387 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata :
handler_name : VideoHandler
Stream #0:1(eng) : Audio : aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 105 kb/s (default)
Metadata :
handler_name : SoundHandler
Stream #0:2 : Video : png, rgb24(pc), 58x38 [SAR 304:261 DAR 16:9], 90k tbr, 90k tbn, 90k tbc (attached pic)
At least one output file must be specified
'''

  


• Difference between single and double quotes in subprocess [Python 3.4]

  11 décembre 2016, par Vasilis

  I’m using Python 3.4 in Windows Server 12 and I have some Python code that executes the ffmpeg command bellow :

  ffmpeg -i input.mp4 -vf select='not(mod(n\,30)),setpts=N/((30)*TB)' -c:v rawvideo  -pix_fmt uyvy422 -y output.avi

  I use the following code to execute the external command :

  try:
  
      output = subprocess.check_output(command, stderr=subprocess.STDOUT, shell=True)
  
  except subprocess.CalledProcessError as exc:
  
      print ("Command %s failed with error code" % command, exc.returncode, exc.output, file=sys.stderr)

  When I pass the command enclosed in single quotes it successfully runs the command :

  command = 'ffmpeg -i input.mp4 -vf select="not(mod(n\,30)),setpts=N/((30)*TB)" -c:v rawvideo  -pix_fmt uyvy422 -y output.avi'

  When I pass the command as a string enclosed in double quotes it fails :

  command = "ffmpeg -i input.mp4 -vf select='not(mod(n\,30)),setpts=N/((30)*TB)' -c:v rawvideo  -pix_fmt uyvy422 -y output.avi"

  The error message is the following :

  [Eval @ 0000000eaf2fe040] Invalid chars ',setpts=N/((30)*TB)' at the end of expression 'not(mod(n,30)),setpts=N/((30)*TB)'  
  
  [Parsed_select_0 @ 0000000eb0d27ca0] Error while parsing expression 'not(mod
  
  (n,30)),setpts=N/((30)*TB)'  
  
  [AVFilterGraph @ 0000000eb0d0a5a0] Error initializing filter 'select' with args 'not(mod(n\\,30)),setpts=N/((30)*TB)'  
  
  Error opening filters!"

  So it appears that when using double quotes the slash / that is part of the setpts=N/((30)*TB) option is not interpreted correctly, while with double quotes there’s no problem. Note that both commands (either with double or single quotes in the select option) work fine when I run them directly from the command prompt.
  However, I’ve seen many people saying that from a technical perspective single and double quotes make no difference, e.g.

  • http://programmers.stackexchange.com/questions/155176/single-quotes-vs-double-quotes
  • http://programmers.stackexchange.com/questions/155176/single-quotes-vs-double-quotes

  Does slash parsing depend on the quotes around the string or this is just a behavior specific to the executable I’m running ?

• Building ffmpeg on WIN 10

  21 mars 2016, par Dmitry

  I`m trying to install ffmpeg library on WIN 10 following instruction.
  Until line

  Invoke the following make commands

  Everything was ok (all results in msys32 output was the same as in instruction). But when do

  ../../../configure \
  
  --toolchain=msvc \
  
  --disable-programs \
  
  --disable-d3d11va \
  
  --disable-dxva2 \
  
  --arch=x86 \
  
  --enable-shared \
  
  --enable-cross-compile \
  
  --target-os=win32 \
  
  --extra-cflags="-MD -DWINAPI_FAMILY=WINAPI_FAMILY_APP -D_WIN32_WINNT=0x0A00" \
  
  --extra-ldflags="-APPCONTAINER WindowsApp.lib" \
  
  --prefix=../../../Build/Windows10/x86
  
  
  
  make
  
  
  
  make install

  Msys32 says :

  cl is unable to create an executable file. C compiler test failed.

  If you think configure made a mistake, make sure you are using the
  latest version from Git. If the latest version fails, report the
  problem to the ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on
  irc.freenode.net. Include the log file "config.log" produced by
  configure as this will help solve the problem.

  Launching msys32 from VS2015 Native Tools Command Prompt.
  How to fix it ?
  screenshot of msys

  Also, in config.log at the end of file found this :

  WARNING : pkg-config not found, library detection may fail. mktemp -u
  XXXXXX y81gTF check_ld cc check_cc BEGIN ./ffconf.J02kVuXC.c
  1 int main(void) return 0 ; END ./ffconf.J02kVuXC.c cl -nologo -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS -MD -DWINAPI_FAMILY=WINAPI_FAMILY_APP -D_WIN32_WINNT=0x0A00 -c -Fo./ffconf.U0KH6R5x.o ./ffconf.J02kVuXC.c ffconf.J02kVuXC.c /c/LIBS/ffmpeg1/ffmpeg/compat/windows/mslink
  -APPCONTAINER WindowsApp.lib -nologo -out :./ffconf.UBL5VH7u.exe ./ffconf.U0KH6R5x.o LINK : fatal error LNK1181 : cannot open input file "WindowsApp.lib" C compiler test failed.