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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"


  


• Black/Empty frames at beginning of video file when file Cut using FFmpeg [closed]

  28 octobre 2024, par d0tb0t

  I am cutting a video using ffmpeg and facing the Black/Empty frame at the start issue.

  


  When Codec Copy -

  


  -y -hide_banner -ss 0:1:0 -i file:///private/var/mobile/Containers/Data/PluginKitPlugin/94588A94-C451-426E-9E9C-A7555B6E7C25/tmp/trim.EC876F92-04BE-41F8-ADF3-8CFC84669908.MOV -to 0:1:33 -t 0:0:33 -vcodec copy -acodec copy -avoid_negative_ts make_zero -async 1 file:///var/mobile/Containers/Data/Application/728D5FED-5E6B-4A37-8DE4-E63E47B06DF9/Documents/FILES/FileCopy.mov


  


  When Re-Encoding -

  


  -y -hide_banner -ss 0:1:0 -i file:///private/var/mobile/Containers/Data/PluginKitPlugin/94588A94-C451-426E-9E9C-A7555B6E7C25/tmp/trim.9F2B209B-B657-471A-AE87-7C464FF10812.MOV -to 0:1:33 -t 0:0:33 -vcodec libx264 -vf scale=1280:720 -pix_fmt yuv420p10le -color_range tv -colorspace bt2020nc -color_primaries bt2020 -color_trc arib-std-b67 -crf 28 -preset ultrafast -acodec copy -avoid_negative_ts make_zero -async 1 file:///var/mobile/Containers/Data/Application/728D5FED-5E6B-4A37-8DE4-E63E47B06DF9/Documents/FILES/FileReEncode.mov


  


  Both of the command provides almost the same issue. Provided a sample gif file below to show the scenario.

  


• Concatenate videos and add black frames between them with ffmpeg

  4 octobre 2024, par user3406207

  I have three videos that I am concatenating with ffmpeg. I would like to add a few black frames in between them. Although I've found a few hints on the web it has not worked for me yet. I have tried to generate an 'empty' video with just black frames with :

  



  ffmpeg -t 20 -s 1920x1080 -f rawvideo -pix_fmt rgb24 -r 25 -i c:\nul  E:\empty.avi


  



  and then concatenate with another one but doesn't work. I have tried a few other things without success. Any help would be greatly appreciated

  



  EDIT : also tried to add black frames before and after video with the following code, but no success :

  



  ffmpeg -f lavfi -i color=c=black:s=1920x1080:r=25:d=100 -i middle_video.avi -filter_complex 
"[0:v]trim=start_frame=1:end_frame=21[blackstart];
[0:v] trim=start_frame=1:end_frame=21 [blackend]; 
[blackstart] [1:v] [blackend] concat=n=3:v=1:a=0[out]" -map "[out]" -c:v qtrle -c:a -copy output.avi


  



  EDIT2 :
Output from ffprobe

  



  Metadata:
encoder: Lavf57.3.100
Duration: 00:00:10.05, start: 0.000000, bitrate: 43302 kb/s
Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 192
0x1080 [SAR 1:1 DAR 16:9], 43333 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 10k tbc
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 k
b/s


  



  EDIT 3
Link to the report of the ffmpeg console output :
FFMPEG session report