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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"


  


• Generate Black frames between concatenated videos ffmpeg

  9 février 2019, par Alex K

  I’m trying to concatenate 2 videos together using ffmpeg concat, but I want to have there be 2 seconds of black between the 2 videos.

  The problem is that whenever I’ve tried to generate a black video and concatenated it in, the properties never match my input video exactly, and so the concatenation is all broken - the audio is broken or the frames change at the wrong speed or generally concatenation fails.

  Here’s the output of ffmpeg -i my_input_video1.mp4 (and is identical for my_input_video2.mp4) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_vid1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.3.100
  
    Duration: 00:00:03.07, start: 0.000000, bitrate: 191 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 480x270, 116 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 63 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  How can I generate a 2 second black video with these properties so that it can be concatenated with my input videos ?

• How to get rid of ffmpeg.exe black terminal in .Net C# ?

  14 juillet 2018, par Muhammad Subhan

  I’m using ffmpeg.exe as a process in C# and encoding some videos with it by parameters to that process and it shows black terminal of encoding process like cmd while encoding. I want to get rid of that terminal. I just want processing to be done at back end and no terminal should be displayed while encoding.