Answers.Body: <p>The concat filter has an option to set no. of inputs. Its default value is 2.</p>
  
  <p>Change to <code>[clpABCD][clpEF][clpG]concat=n=3[out1]</code>.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-06-14T17:04:36.470Z
Answers.LastActivityDate: 2020-06-14T17:04:36.470Z
Answers.UserDisplayName: Gyan
Body: <p>I am trying to flip 180 degrees parts of a video file from action camera.
  When i was using </p>
  
  <pre><code>"[clpABCD][clpEF][clpG]concat[out1]" -" instead of "[clpABCD][clpEFG]concat[out1]" -"
  </code></pre>
  
  <p>ffmpeg said Too many inputs specified for the "concat" filter !!!! Why?</p>
  
  <pre><code>ffmpeg -i video_output_02.avi -filter_complex \
    "[0:v]trim=start=0:duration=516[clpA];\
     [0:v]trim=start=516:duration=1,setpts=PTS-STARTPTS[clpB];\
     [clpB]vflip, hflip[clpBf];\
     [clpA][clpBf]concat[clpAB];\
     [0:v]trim=start=517:duration=1204,setpts=PTS-STARTPTS[clpC];\
     [0:v]trim=start=1721:duration=155,setpts=PTS-STARTPTS[clpD];\
     [clpD]vflip, hflip[clpDf];\
     [clpC][clpDf]concat[clpCD];\
     [clpAB][clpCD]concat[clpABCD];\
     [0:v]trim=start=1876:duration=581,setpts=PTS-STARTPTS[clpE];\
     [0:v]trim=start=2457:duration=24,setpts=PTS-STARTPTS[clpF];\
     [clpF]vflip, hflip[clpFf];\
     [clpE][clpFf]concat[clpEF];\
     [0:v]trim=start=2481:duration=253,setpts=PTS-STARTPTS[clpG];\
     [clpABCD][clpEF][clpG]concat[out1]" -map [out1]  -crf 14  -vcodec libx264  -vb 20M  Hflip_2.mp4
  ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
    built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
    configuration: --enable-gpl --enable-libx264 --enable-libvpx --enable-libmp3lame --enable-libopus
    libavutil      56. 31.100 / 56. 31.100
    libavcodec     58. 54.100 / 58. 54.100
    libavformat    58. 29.100 / 58. 29.100
    libavdevice    58.  8.100 / 58.  8.100
    libavfilter     7. 57.100 /  7. 57.100
    libswscale      5.  5.100 /  5.  5.100
    libswresample   3.  5.100 /  3.  5.100
    libpostproc    55.  5.100 / 55.  5.100
  Input #0, avi, from 'video_output_02.avi':
    Metadata:
      encoder         : Lavf58.29.100
    Duration: 00:45:34.41, start: 0.000000, bitrate: 22653 kb/s
      Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuvj420p(pc, progressive), 1280x720 [SAR 1521:1520 DAR 169:95], 22649 kb/s, 32 fps, 32 tbr, 32 tbn, 64 tbc
  [AVFilterGraph @ 0x564f261d9340] Too many inputs specified for the "concat" filter.
  
  
  
  ffmpeg -i video_output_02.avi -filter_complex \
   "[0:v]trim=start=0:duration=516[clpA];\
    [0:v]trim=start=516:duration=1,setpts=PTS-STARTPTS[clpB];\
    [clpB]vflip, hflip[clpBf];\
    [clpA][clpBf]concat[clpAB];\
    [0:v]trim=start=517:duration=1204,setpts=PTS-STARTPTS[clpC];\
    [0:v]trim=start=1721:duration=155,setpts=PTS-STARTPTS[clpD];\
    [clpD]vflip, hflip[clpDf];\
    [clpC][clpDf]concat[clpCD];\
    [clpAB][clpCD]concat[clpABCD];\
    [0:v]trim=start=1876:duration=581,setpts=PTS-STARTPTS[clpE];\
    [0:v]trim=start=2457:duration=24,setpts=PTS-STARTPTS[clpF];\
    [clpF]vflip, hflip[clpFf];\
    [clpE][clpFf]concat[clpEF];\
    [0:v]trim=start=2481:duration=253,setpts=PTS-STARTPTS[clpG];\
    [clpEF][clpG]concat[clpEFG];\
    [clpABCD][clpEFG]concat[out1]" -map [out1]  -crf 14  -vcodec libx264  -vb 20M  Hflip_2.mp4
  </code></pre>
  
  <p>The command that "is working"</p>
  
  <pre><code>ffmpeg -i video_output_02.avi -filter_complex \
   "[0:v]trim=start=0:duration=516[clpA];\
    [0:v]trim=start=516:duration=1,setpts=PTS-STARTPTS[clpB];\
    [clpB]vflip, hflip[clpBf];\
    [clpA][clpBf]concat[clpAB];\
    [0:v]trim=start=517:duration=1204,setpts=PTS-STARTPTS[clpC];\
    [0:v]trim=start=1721:duration=155,setpts=PTS-STARTPTS[clpD];\
    [clpD]vflip, hflip[clpDf];\
    [clpC][clpDf]concat[clpCD];\
    [clpAB][clpCD]concat[clpABCD];\
    [0:v]trim=start=1876:duration=581,setpts=PTS-STARTPTS[clpE];\
    [0:v]trim=start=2457:duration=24,setpts=PTS-STARTPTS[clpF];\
    [clpF]vflip, hflip[clpFf];\
    [clpE][clpFf]concat[clpEF];\
    [0:v]trim=start=2481:duration=253,setpts=PTS-STARTPTS[clpG];\
    [clpEF][clpG]concat[clpEFG];\
    [clpABCD][clpEFG]concat[out1]" -map [out1]  -crf 14  -vcodec libx264  -vb 20M  Hflip_2.mp4
  </code></pre>
  
Tags: <ffmpeg>
Title: Why concat in ffmpeg 4.2.3 says too many arguments?
UserDisplayName: Estatistics
ThreadText: # Why concat in ffmpeg 4.2.3 says too many arguments?
  
  (Asked by: username_0 on 2020-06-14)
  
  I am trying to flip 180 degrees parts of a video file from action camera.
  When i was using
  
  ```
  "[clpABCD][clpEF][clpG]concat[out1]" -" instead of "[clpABCD][clpEFG]concat[out1]" -"
  
  ```
  
  ffmpeg said Too many inputs specified for the "concat" filter !!!! Why?
  
  ```
  ffmpeg -i video_output_02.avi -filter_complex \
    "[0:v]trim=start=0:duration=516[clpA];\
     [0:v]trim=start=516:duration=1,setpts=PTS-STARTPTS[clpB];\
     [clpB]vflip, hflip[clpBf];\
     [clpA][clpBf]concat[clpAB];\
     [0:v]trim=start=517:duration=1204,setpts=PTS-STARTPTS[clpC];\
     [0:v]trim=start=1721:duration=155,setpts=PTS-STARTPTS[clpD];\
     [clpD]vflip, hflip[clpDf];\
     [clpC][clpDf]concat[clpCD];\
     [clpAB][clpCD]concat[clpABCD];\
     [0:v]trim=start=1876:duration=581,setpts=PTS-STARTPTS[clpE];\
     [0:v]trim=start=2457:duration=24,setpts=PTS-STARTPTS[clpF];\
     [clpF]vflip, hflip[clpFf];\
     [clpE][clpFf]concat[clpEF];\
     [0:v]trim=start=2481:duration=253,setpts=PTS-STARTPTS[clpG];\
     [clpABCD][clpEF][clpG]concat[out1]" -map [out1]  -crf 14  -vcodec libx264  -vb 20M  Hflip_2.mp4
  ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
    built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
    configuration: --enable-gpl --enable-libx264 --enable-libvpx --enable-libmp3lame --enable-libopus
    libavutil      56. 31.100 / 56. 31.100
    libavcodec     58. 54.100 / 58. 54.100
    libavformat    58. 29.100 / 58. 29.100
    libavdevice    58.  8.100 / 58.  8.100
    libavfilter     7. 57.100 /  7. 57.100
    libswscale      5.  5.100 /  5.  5.100
    libswresample   3.  5.100 /  3.  5.100
    libpostproc    55.  5.100 / 55.  5.100
  Input #0, avi, from 'video_output_02.avi':
    Metadata:
      encoder         : Lavf58.29.100
    Duration: 00:45:34.41, start: 0.000000, bitrate: 22653 kb/s
      Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuvj420p(pc, progressive), 1280x720 [SAR 1521:1520 DAR 169:95], 22649 kb/s, 32 fps, 32 tbr, 32 tbn, 64 tbc
  [AVFilterGraph @ 0x564f261d9340] Too many inputs specified for the "concat" filter.
  
  ffmpeg -i video_output_02.avi -filter_complex \
   "[0:v]trim=start=0:duration=516[clpA];\
    [0:v]trim=start=516:duration=1,setpts=PTS-STARTPTS[clpB];\
    [clpB]vflip, hflip[clpBf];\
    [clpA][clpBf]concat[clpAB];\
    [0:v]trim=start=517:duration=1204,setpts=PTS-STARTPTS[clpC];\
    [0:v]trim=start=1721:duration=155,setpts=PTS-STARTPTS[clpD];\
    [clpD]vflip, hflip[clpDf];\
    [clpC][clpDf]concat[clpCD];\
    [clpAB][clpCD]concat[clpABCD];\
    [0:v]trim=start=1876:duration=581,setpts=PTS-STARTPTS[clpE];\
    [0:v]trim=start=2457:duration=24,setpts=PTS-STARTPTS[clpF];\
    [clpF]vflip, hflip[clpFf];\
    [clpE][clpFf]concat[clpEF];\
    [0:v]trim=start=2481:duration=253,setpts=PTS-STARTPTS[clpG];\
    [clpEF][clpG]concat[clpEFG];\
    [clpABCD][clpEFG]concat[out1]" -map [out1]  -crf 14  -vcodec libx264  -vb 20M  Hflip_2.mp4
  
  ```
  
  The command that "is working"
  
  ```
  ffmpeg -i video_output_02.avi -filter_complex \
   "[0:v]trim=start=0:duration=516[clpA];\
    [0:v]trim=start=516:duration=1,setpts=PTS-STARTPTS[clpB];\
    [clpB]vflip, hflip[clpBf];\
    [clpA][clpBf]concat[clpAB];\
    [0:v]trim=start=517:duration=1204,setpts=PTS-STARTPTS[clpC];\
    [0:v]trim=start=1721:duration=155,setpts=PTS-STARTPTS[clpD];\
    [clpD]vflip, hflip[clpDf];\
    [clpC][clpDf]concat[clpCD];\
    [clpAB][clpCD]concat[clpABCD];\
    [0:v]trim=start=1876:duration=581,setpts=PTS-STARTPTS[clpE];\
    [0:v]trim=start=2457:duration=24,setpts=PTS-STARTPTS[clpF];\
    [clpF]vflip, hflip[clpFf];\
    [clpE][clpFf]concat[clpEF];\
    [0:v]trim=start=2481:duration=253,setpts=PTS-STARTPTS[clpG];\
    [clpEF][clpG]concat[clpEFG];\
    [clpABCD][clpEFG]concat[out1]" -map [out1]  -crf 14  -vcodec libx264  -vb 20M  Hflip_2.mp4
  
  ```
  
  **Tags:** ffmpeg
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2020-06-14. Score: 1
  
  The concat filter has an option to set no. of inputs. Its default value is 2.
  
  Change to `[clpABCD][clpEF][clpG]concat=n=3[out1]`.
  
  
  ---
  
  