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• FFMPEG optimal cmd for large filter_complex

  19 novembre 2019, par Artem Kuznetsov

  I need to mount complex video scenes from several files.
  Many trims, atrims, overlays, amix.
  Maybe it needs to be divided into several calls ?

  And I use something like this :

  ffmpeg -y -i 1.mp4 -i 2.mp4 -i 3.mp4 -i 4.mp4 -i 5.mp4 -i 6.mp4 -i 7.mp4 -i 8 -i 9.mp4 -i 10.mp4 -i 11.mp4 -i 12.mp4 -i 13.mp4 -f lavfi -i anullsrc \
  
  -filter_complex "[0:v]trim=end=0.456, setpts=PTS-STARTPTS[out0]; \
  
  [0:a]atrim=end=0.456, asetpts=PTS-STARTPTS[a_out0]; \
  
  [0:v]trim=0.456:969.456, setpts=PTS-STARTPTS, scale=iw*180/ih:180[out1]; \
  
  [1:v][out1]overlay=main_w-overlay_w-0:main_h-overlay_h:eof_action=pass[out2]; \
  
  [0:a]atrim=0.456:969.456, asetpts=PTS-STARTPTS[a_out1]; \
  
  [0:v]trim=969.456:974.138, setpts=PTS-STARTPTS[out3]; \
  
  [0:a]atrim=969.456:974.138, asetpts=PTS-STARTPTS[a_out2]; \
  
  [0:v]trim=974.138:1382.138, setpts=PTS-STARTPTS, scale=iw*180/ih:180[out4]; \
  
  [2:v][out4]overlay=main_w-overlay_w-0:main_h-overlay_h:eof_action=pass[out5]; \
  
  [0:a]atrim=974.138:1382.138, asetpts=PTS-STARTPTS[a_out3]; \
  
  [2:a][a_out3]amix=inputs=2:duration=first[a_out4]; \
  
  [0:v]trim=1382.138:1408.739, setpts=PTS-STARTPTS[out6]; \
  
  [0:a]atrim=1382.138:1408.739, asetpts=PTS-STARTPTS[a_out5]; \
  
  [0:v]trim=1408.739:2089.758, setpts=PTS-STARTPTS, scale=iw*180/ih:180[out7]; \
  
  [3:v][out7]overlay=main_w-overlay_w-0:main_h-overlay_h:eof_action=pass[out8]; \
  
  [0:a]atrim=1408.739:2089.758, asetpts=PTS-STARTPTS[a_out6]; \
  
  [3:a][a_out6]amix=inputs=2:duration=first[a_out7]; \
  
  [0:v]trim=2089.758:2112.511, setpts=PTS-STARTPTS[out9]; \
  
  [0:a]atrim=2089.758:2112.511, asetpts=PTS-STARTPTS[a_out8]; \
  
  [0:v]trim=2112.511:2358.528, setpts=PTS-STARTPTS, scale=iw*180/ih:180[out10]; \
  
  [4:v][out10]overlay=main_w-overlay_w-0:main_h-overlay_h:eof_action=pass[out11]; \
  
  [0:a]atrim=2112.511:2358.528, asetpts=PTS-STARTPTS[a_out9]; \
  
  ...
  
  [9:v]trim=18.184:36.184, setpts=PTS-STARTPTS, scale=iw*180/ih:180[out26]; \
  
  [10:v][out26]overlay=main_w-overlay_w-0:main_h-overlay_h:eof_action=pass[out27]; \
  
  [9:a]atrim=18.184:36.184, asetpts=PTS-STARTPTS[a_out18]; \
  
  [9:v]trim=36.184:90.237, setpts=PTS-STARTPTS[out28]; \
  
  [9:a]atrim=36.184:90.237, asetpts=PTS-STARTPTS[a_out19]; \
  
  [9:v]trim=90.237:345.237, setpts=PTS-STARTPTS, scale=iw*180/ih:180[out29]; \
  
  [11:v][out29]overlay=main_w-overlay_w-0:main_h-overlay_h:eof_action=pass[out30]; \
  
  [9:a]atrim=90.237:345.237, asetpts=PTS-STARTPTS[a_out20]; \
  
  [9:v]trim=345.237:414.306, setpts=PTS-STARTPTS[out31]; \
  
  [9:a]atrim=345.237:414.306, asetpts=PTS-STARTPTS[a_out21]; \
  
  [9:v]trim=414.306:585.314, setpts=PTS-STARTPTS, scale=iw*180/ih:180[out32]; \
  
  [12:v][out32]overlay=main_w-overlay_w-0:main_h-overlay_h:eof_action=pass[out33]; \
  
  [9:a]atrim=414.306:585.314, asetpts=PTS-STARTPTS[a_out22]; \
  
  [12:a][a_out22]amix=inputs=2:duration=first[a_out23]; \
  
  [9:v]trim=start=585.314, setpts=PTS-STARTPTS[out34]; \
  
  [9:a]atrim=start=585.314, asetpts=PTS-STARTPTS[a_out24]; \
  
  [out0][a_out0][out2][a_out1][out3][a_out2][out5][a_out4][out6][a_out5][out8][a_out7][out9][a_out8][out11][a_out10][out12][a_out11][out14][a_out12][out15][a_out13][out18][a_out14][out19][silence0][out20][a_out15][out23][a_out16][out24][silence1][out25][a_out17][out27][a_out18][out28][a_out19][out30][a_out20][out31][a_out21][out33][a_out23][out34][a_out24]concat=n=23:v=1:a=1[out][a_out]" \
  
  -map [out] -map [a_out] \
  
  -c:v libx264 -crf 18 -pix_fmt yuv420p \
  
  -c:a aac \
  
  output.mp4

  Is this optimal ? Can this be written somehow differently ?
  Now I have this problem :

  [out_0_1 @ 0x7fb2b8ca96c0] 100 buffers queued in out_0_1, something may be wrong. speed=8.51x      
  
  [out_0_1 @ 0x7fb2b8ca96c0] 1000 buffers queued in out_0_1, something may be wrong.

• How to cut video properly with this ffmpeg python script

  11 décembre 2019, par exoboyyeet

  I am trying to write a python script that breaks a video into chunks of less than 64 mb each. This is my for loop that convert each chunk of broken up video :

  for part in range(parts):
  
      print(start, end)
  
      subprocess.run(f"ffmpeg -i {filename} -vcodec copy -acodec copy -ss {start} -t {end} {newfile}\OutputPart{part}.mp4", shell=True)
  
      start = end
  
      end += partlength

  I defined start to be 0 originally, and the end marker to be the length of each part.

  For example, if the video file is 139 mb and 20 mins long, it takes the size divided by 64 [2.171875] turns it into an integer plus 1 in order to add a third part for any amount of video after the last 64 mb marker. Then, it takes that number of parts and divides the length of the video (in our case 20 mins = 1200 seconds) by the number of parts (the variable set previously as parts) which would get us (1200 seconds divided by 3 parts = ) 400 which is the length each part should be (partlength). Now, it runs a loop for the number of parts, to convert a video with the start point (denoted in the ffmpeg command as -ss) originally 0, and the end point (-t), originally the length of 1 part (in our case 400). after the first run through, to make sure the start and endpoints are correct, it prints the start and end points. All the runs say the correct start and endpoints (0-400 ;400-800 ;800-1200). The first and third files convert perfectly, while the second file of the three has from 400-1200 (it includes the third file).

  Is there a reason why it won’t copy the correct segment ?

• FFMPEG : Generate mastered m3u8 playlist

  22 octobre 2019, par Сергей Барахтенко

  Tell the command line for FFMPEG to generate a playlist of the following format :

  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=380000,RESOLUTION=640x360,CODECS="mp4a.40.2,avc1.77.30",CLOSED-CAPTIONS=NONE
  
  https://myurl/media/manifest/[input_file_name]-360.m3u8
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1510000,RESOLUTION=1920x1080,CODECS="mp4a.40.2,avc1.77.30",CLOSED-CAPTIONS=NONE
  
  https://myurl/media/manifest/[input_file_name]-1080.m3u8
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=890000,RESOLUTION=1280x720,CODECS="mp4a.40.2,avc1.77.30",CLOSED-CAPTIONS=NONE
  
  https://myurl/media/manifest/[input_file_name]-720.m3u8
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=250000,RESOLUTION=320x180,CODECS="mp4a.40.2,avc1.77.30",CLOSED-CAPTIONS=NONE
  
  https://myurl/media/manifest/[input_file_name]-180.m3u8

  As you can see from the example, the file contains links to other m3u8 playlists, which are downloaded depending on the network bandwidth (BANDWIDTH parameter)

  An example of an internal m3u8 playlist (playlist [input_file_name]-360.m3u8)

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-PLAYLIST-TYPE:VOD
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-TARGETDURATION:4
  
  #EXTINF:4.000,
  
  https://myurl/media/conversion/[input_file_name]-360.mp4-1.ts
  
  #EXTINF:4.000,
  
  https://myurl/media/conversion/[input_file_name]-360.mp4-2.ts
  
  #EXTINF:4.000,
  
  https://myurl/media/conversion/[input_file_name]-360.mp4-3.ts
  
  #EXTINF:4.000,
  
  https://myurl/media/conversion/[input_file_name]-360.mp4-4.ts
  
  #EXTINF:4.000,
  
  https://myurl/media/conversion/[input_file_name]-360.mp4-5.ts
  
  #EXTINF:4.000,
  
  https://myurl/media/conversion/[input_file_name]-360.mp4-6.ts
  
  #EXTINF:4.000,
  
  https://myurl/media/conversion/[input_file_name]-360.mp4-7.ts
  
  #EXTINF:4.000,
  
  https://myurl/media/conversion/[input_file_name]-360.mp4-8.ts
  
  ...
  
  #EXT-X-ENDLIST

  As you can see from it, the source file was divided into 8 TS segments