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• ffmpeg build with msys2 + VS2017 hang

  20 décembre 2019, par lucky1928

  I am using windows10 + MSVC2017 Community + MSYS2 to build ffmpeg 4.0.1 with below steps :

  1. Start a Visual Studio 2017 "Developer Command Prompt"

  2. cd into msys64 directory, and then invoke MSYS2

     msys2_shell.cmd -msys2 -use-full-path

  3. In MSYS2 shell, cd into ffmpeg build directory.

  4. run ffmpeg config command :

     ./configure --prefix=./install --toolchain=msvc

  After press enter with above command line,sounds like it hang there forever.
  never print anything out and not exit as well.

• Win Batch : Not getting data from array that works just a line above it

  5 mai 2018, par HASJ

  This code is from a CLI batch video converter that I’m trying to make using FFmpeg.

  ::@echo off
  
  setlocal enableDelayedExpansion
  
  ::Create variable so that the CMD can understand "NL" as a New Line
  
  ::Both spaces are needed
  
  set NL=^
  
  
  
  
  
  :choice
  
  echo [1] Single input!NL![2] Single input with multiple resolutions!NL![3] Multiple inputs!NL![4] Multiple inputs with multiple resolutions!NL![5] Exit
  
  set /p choice="Choose: "
  
  if /I %choice% EQU 1 goto :setSingleInput
  
  if /I %choice% EQU 2 goto :setSingleInput
  
  ::Please already have your files in the Clipboard before choosing options [3] or [4]
  
  if /I %choice% EQU 3 goto :getFileList
  
  if /I %choice% EQU 4 goto :getFileList
  
  if /I %choice% EQU 5 goto :EOL
  
  
  
  :setSingleInput
  
  set /p input="Input: "
  
  mediainfo --Output=Video;"%%Height%%" %input%> %temp%\ffmpegres.txt
  
  set /p height=< %temp%\ffmpegres.txt
  
  ::del %temp%\ffmpegres.txt
  
  if /I %choice% EQU 1 goto :inputSingle
  
  if /I %choice% EQU 2 goto :inputMultiple
  
  
  
  :inputSingle
  
  if /I %height% GTR 720 goto :1080
  
  if /I %height% GTR 480 if /I %height% LEQ 720 goto :720
  
  if /I %height% LSS 481 goto :480
  
  
  
  :inputMultiple
  
  if /I %height% GTR 720 goto :1080m
  
  if /I %height% GTR 480 if /I %height% LEQ 720 goto :720m
  
  if /I %height% LEQ 481 goto :480m
  
  
  
  :getFileList
  
  Powershell Get-Clipboard > %temp%\ffmpeglist.txt
  
  ::Thanks to MichaelS for the following code https://stackoverflow.com/a/32717316/5833369
  
  set fileList=%temp%\ffmpeglist.txt
  
  set x=1
  
  if /I %choice% EQU 3 goto :inputVarious
  
  if /I %choice% EQU 4 goto :inputVariousMultiple
  
  
  
  :inputVarious
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;%%Height%% !%input[%x%]%! > %temp%\ffmpegres%x%.txt
  
  set %height[1]%=< %temp%\ffmpegres%x%.txt
  
  set /a x=%x%+1
  
  )
  
  set x=1
  
  echo %height[1]%
  
  goto :EOL
  
  ::if /I !height[%x%]! GTR 720 goto :1080v
  
  ::if /I !height[%x%]! GTR 480 if /I !height! LEQ 720 goto :720v
  
  ::if /I !height[%x%]! LSS 481 goto :480v
  
  
  
  :inputVariousMultiple
  
  if /I !height! GTR 720 goto :1080vm
  
  if /I !height! GTR 480 if /I !height! LEQ 720 goto :720vm
  
  if /I !height! LSS 481 goto :480vm
  
  
  
  :1080
  
  echo Encoding %input% @ %height%p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 3000k -crf 23 %input%.%height%p.mkv
  
  goto :choice
  
  
  
  :720
  
  echo Encoding %input% @ %height%p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 22 %input%.%height%p.mkv
  
  goto :choice
  
  
  
  :480
  
  echo Encoding %input% @ %height%p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 %input%.%height%p.mkv
  
  goto :choice
  
  
  
  :1080m
  
  echo Encoding %input% to 1080p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 3000k -crf 23 %input%.1080p.mkv
  
  echo Encoding %input% to 720p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -vf scale=-1:720 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 %input%.720p.mkv
  
  echo Encoding %input% to 480p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -vf scale=-2:480 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 %input%.480p.mkv
  
  goto :choice
  
  
  
  :720m
  
  echo Encoding %input% to 720p and 480p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 %input%.720p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -vf scale=-2:480 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 %input%.480p.mkv
  
  goto :choice
  
  
  
  :480m
  
  echo Encoding %input% to 480p and 360p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 %input%.480p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -vf scale=-1:360 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 600k -crf 17 %input%.360p.mkv
  
  goto :choice
  
  
  
  :1080v
  
  echo Encoding !input[%x%]! @ !height[%x%]!p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 3000k -crf 23 !input[%x%]!.!height!p.mkv
  
  set /a x=%x%+1
  
  )
  
  del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :720v
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! @ !height[%x%]!p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 !input[%x%]!.!height!p.mkv
  
  set /a x=!x!+1
  
  )
  
  del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :480v
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! @ !height[%x%]!p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 !input[%x%]!.!height!p.mkv
  
  set /a x=!x!+1
  
  )
  
  del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :1080vm
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! to 1080p, 720p and 480p with x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 3000k -crf 23 !input[%x%]!.1080p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -vf scale=-1:720 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 !input[%x%]!.720p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -vf scale=-2:480 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 !input[%x%]!.480p.mkv
  
  set /a x=!x!+1
  
  )
  
  ::del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :720vm
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! to 720p and 480p with x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 !input[%x%]!.720p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -vf scale=-2:480 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 !input[%x%]!.480p.mkv
  
  set /a x=!x!+1
  
  )
  
  ::del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :480vm
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! to 480p and 360p with x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 !input[%x%]!.480p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -vf scale=-1:360 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 600k -crf 17 !input[%x%]!.360p.mkv
  
  set /a x=!x!+1
  
  )
  
  ::del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :EOL
  
  ::endlocal
  
  pause

  Everything works until it gets to !%input[%x%]%! in the :inputVarious group.

  Because this is the output I get from that line :

  mediainfo --Output=Video;%Height% !x!  1>\Temp\ffmpegres1.txt

  What I’m trying to do is get the data stored in the input[x] array position and send it to mediainfo as input, so that it can get the video’s resolution, store that into the height[x] array.

  I have no idea what I’m doing wrong. Could someone help me ? Tips on how to make the code less redundant and more elegant are also appreciated.

  Obs. : I tried to recreate this in Python but I’m too much of a bad study and couldn’t get working (although what I was able to do, was done in a less janky way)

• How to recompile with -fPIC

  15 février 2023, par user1455085

  I was trying to reinstall my ffmpeg, following this guide, on my ARM Ubuntu machine. Unfortunately, when I compile a program which uses this lib I get the following failure :

  



  /usr/bin/ld: /usr/local/lib/libavcodec.a(amrnbdec.o): relocation R_ARM_MOVW_ABS_NC against `a local symbol' can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/libavcodec.a: could not read symbols: Bad value
collect2: ld returned 1 exit status


  



  Now I would like to recompile it with -fPIC like the compiler is suggesting but I have no idea how. Any help is appreciated.