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• cutting multiple segments with ffmpeg [duplicate]

  13 juin 2018, par B Pulsart

  This question already has an answer here :

  • Every 30 seconds is to cut a video 3s
    
    1 answer
    

  So there is a 10 min long .mp4 and I have to cut it in 2 seconds long segments every 10 seconds, then concatenate all 2 sec segments together to get a 2 min long film.

  I manage to do that with a loop in python that subprocep ffmpeg, but it’s long and ugly (cut, cut cut... and then glue)

  Is it a way to do that with just a line in ffmpeg ?

  my code in python for cutting sequences :

  import subprocess# as sp
  
  
  
  ffmpeg = file on disk # on Windows
  
  film_in =  a file name
  
  
  
  t_total = 10#min
  
  t_sec = t_total*60
  
  
  
  def c_cut(time) :
  
      cmd = [ffmpeg  , '-i' ,film_in ,'-b:v', '800k' ,'-ss', str(time) , '-t','2' , '-an', film_out]
  
      return cmd
  
  
  
  
  
  for tps in range(0, t_sec, 10) :
  
      film_out = a file name unique for each segment
  
      command = c_cut(tps)
  
      subprocess.call(command)

• how do I only output a single video stream per HLS output

  20 octobre 2018, par Marc Archenault

  I have successfully output 3 HLS output using -map 360, 720 & 1080p. My source file is 540p. once generated I use ffprobe on the newly created 360.ts, 720.ts, and 1080.ts and notice that there is a second video channel. This channel is the input video. How do I have FFmpeg not output the original video as part of the output ?

  this is the ffprobe on 360.ts

  Stream #0:0[0x100] : Video : h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  Stream #0:10x101 : Audio : aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 100 kb/s
  Stream #0:2[0x102] : Video : h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

  This is the FFmpeg command

  %ffmpeg% -loglevel fatal -threads %threads% -hide_banner -y -i %input% -i %overlayImg%^
  -filter_complex "[1]colorchannelmixer=aa=%thumbopacity%,scale=iw*%thumbscale% :-1[wm] ;[0:v][wm]overlay=(main_w-overlay_w)-36 :(main_h-overlay_h)-21,split=4[a][b][c][d] ;[a]scale=w=640:h=360:force_original_aspect_ratio=decrease[a] ;[b]scale=w=1280:h=720:force_original_aspect_ratio=decrease[b] ;[c]scale=w=1920:h=1080:force_original_aspect_ratio=decrease[c] ;[d]scale=w=1280:h=720:force_original_aspect_ratio=decrease[d]"^
  -map "[a]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 800k -maxrate 856k -bufsize 1200k -b:a 96k -hls_flags single_file^
  %output%\360p.m3u8^
  -map "[b]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 2800k -maxrate 2996k -bufsize 4200k -b:a 128k -hls_flags single_file^
  %output%\720p.m3u8^
  -map "[c]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 5000k -maxrate 5350k -bufsize 7500k -b:a 192k -hls_flags single_file^
  %output%\1080p.m3u8^
  -map "[d]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -preset %preset%^
  %output%\720.mp4^
  -map 0:v -y -ss 0.5 -vframes 1 -s %thumbsize% -ss 30^
  %outputthumb%

  thank you.

• libdav1d : update API usage to the first stable release

  11 décembre 2018, par James Almer

  libdav1d : update API usage to the first stable release
  The color fields were moved to another struct, and a way to propagate
  
  timestamps and other input metadata was introduced, so the packet
  
  fifo can be removed.
  Add support for 12bit streams, an option to disable film grain, and
  
  read the profile from the sequence header referenced by the ouput
  
  picture instead of guessing based on output pix_fmt.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DBH] configure
  • [DBH] libavcodec/libdav1d.c
  • [DBH] libavcodec/version.h