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• ffmpeg autodetect and cut black bars on video [closed]

  30 octobre 2024, par some_vasya

  FILE_SRC="$HOME/some.mp4"
CROP=$(ffmpeg -ss 00:00:15 -i "${FILE_SRC}" -t 00:00:30 -vsync vfr -vf fps=1/2,cropdetect -f null - 2>&1 | awk '/crop/ { print $NF }' | tr ' ' '\n' | sort | uniq -c | sort -n | tail -1 | awk '{ print $NF }')

# before converting, need to check
fplay -vf "${CROP}" # <-- the black stripes remain



  


  Question : how to remove black bars in video correctly so that you can watch video on TV without black bars, taking into account the definition of bars ? I am interested in a solution using ffmpeg, and not other means

  


  I tried to find a solution to work in automatic mode, but I didn't find it

  


  I="$@"
X=${I##*.}
O=${I%.*}_zoomed.${X}
f=$(which ffmpeg 2>/dev/null)
echo ${I}
C=$($f -i "$I" -t 1 -vf cropdetect -f null - 2>&1|awk '/crop/{print $NF}'|tail -n1)
echo "${C}"
echo $f -i "$I" -vf "$C" "$O"; $f -i "$I" -vf "$C" "$O"


  


• avcodec/cbs_av1 : fix handling reference frames on show_existing_frame frames

  24 août 2020, par James Almer

  avcodec/cbs_av1 : fix handling reference frames on show_existing_frame frames
  Implement Section 7.21 "Reference frame loading process" and Section 7.20
  
  "Reference frame update process" for show_existing_frame frames, as required by
  
  the definition in Section 7.4 "Decode frame wrapup process".
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/cbs_av1_syntax_template.c

• ffmpeg from chrome native messaging host app not working

  9 juin 2014, par Moisés Olmedo

  OK, this is what I got, I’m using native messaging to fire a c++ program from a chrome extension in Windows.
  This c++ program (ehost.exe) creates a ffmpeg process for recording the input audio and saving it to mp3.
  I do this with the CreateProcess() function
  This works perfect when I open ehost.exe myself (double clicking it)
  but when I open it from my chrome extension (chrome.runtime.connectNative() ), the ffmpeg process opens but ffmpeg writes no output file, as if it didn’t have permissions...

  Anybody knows why ?
  This is the ehost.exe code for starting ffmpeg.exe

  static HANDLE startFFmpeg()
   {
       char cmd[] = "C:\Users\moizilla\Desktop\native\ffmpeg\bin\ffmpeg.exe -y -f dshow -i audio=\"Microphone (High Definition Aud\" -acodec libmp3lame C:\Users\moizilla\Desktop\native\kasdkddfodkadd.mp3";
       PROCESS_INFORMATION pi = {0};
       STARTUPINFO si={0};
       si.cb = sizeof(STARTUPINFO);
       if(CreateProcess(NULL, cmd, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi)){
           CloseHandle(pi.hThread);
           return pi.hProcess;
       }
       return NULL;
}