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• FFmpeg zoompan animation results in zig-zag pattern [closed]

  2 février 2024, par kregus

  please assist, as I am pulling my hair out !

  


  The goal is for a user to specify a zoomPoint in a video as follows :

  


  {
   "scale":4,        # Scale factor, here x4
   "offset":0,       # Start zooming in after 0ms
   "duration":5000,  # Stay zoomed in for 5000ms
   "marginX":80,     # Zoom x to 80% of video width 
   "marginY":10      # Zoom y to 10% of video height
}


  


  I am running the following, simplified FFmpeg command :

  


  ffmpeg -i "/tmp/input.mp4" -c:v libx264 -r 30 -vf "scale=iw*2:ih*2,zoompan=fps=30:z='if(gte(it,0.0)*lt(it,5.0), min(pzoom+0.2, 4),if(gte(it,5.0)*lt(it,5.5), max(pzoom-0.2, 1), 1))':d=1:s=1512x982:x='(iw - iw/4)*(80/100)':y='(ih - ih/4)*(10/100)'" /tmp/output.mp4


  


  The animation duration is 0.5s, the video framerate is 30fps, and so there are 0.5 / (1/30) = 15 animation frames.

  


  Zoom distance is scale - 1 = 3 in this case, which makes the zoom increment 3 / 15 = 0.2.

  


  This results in the following example video : click here

  


  While the zoom animation ends in the correct position, you will notice it arrives at that position in a zig-zag pattern, where it starts by zooming into the top-right corner, before changing direction towards the correct position.

  


  I cannot seem to figure out how to get it to animate the zoom in a straight line to the specified x/y position.

  


  Any tips are welcome, thanks !

  


• FFMpeg drawtext not working in my code

  10 juillet 2018, par Dev

  I am trying to overlay a text on existing movie using FFMpeg. Overlaying of an image works perfectly, but failed to drawtext. My code is as below.

  GeneralUtils.checkForPermissionsMAndAbove(RecordVideo.this, true);
  
  LoadJNI vk = new LoadJNI();
  
  String[] complexCommand = {
  
      "ffmpeg", "-i", FilePath, "-vf",
  
      "drawtext=text='Hello Dev..':"
  
          + "fontsize=24:fontfile=/system/fonts/DroidSans.ttf:box=1:boxcolor=black@0.5:x=w-tw:y=h-th",
  
      FilePath1};
  
  vk.run(complexCommand , StorageDIR , getApplicationContext());

  I am getting error as follows

  ffmpeg version git-2016-10-26-efa89a8 Copyright (c) 2000-2016 the FFmpeg 
  
  
  
  developers
  
    built with gcc 4.9 (GCC) 20140827 (prerelease)
  
  ffmpeg4android 3.22_00_full_LM322 
  
    libavutil      55. 35.100 / 55. 35.100
  
    libavcodec     57. 65.100 / 57. 65.100
  
    libavformat    57. 57.100 / 57. 57.100
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 66.100 /  6. 66.100
  
    libswscale      4.  3.100 /  4.  3.100
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Splitting the commandline.
  
  Reading option '-i' ... matched as input file with argument '/storage/emulated/0/Pictures/ReporterLive/VID_10072018141402.avi'.
  
  Reading option '-vf' ... matched as option 'vf' (set video filters) with argument 'drawtext=text='Hello Dev..':fontsize=24:fontfile=/system/fonts/DroidSans.ttf:box=1:boxcolor=black@0.5:x=w-tw:y=h-th'.
  
  Reading option '/storage/emulated/0/Pictures/ReporterLive/VID_10072018141402_1.avi' ... matched as output file.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file /storage/emulated/0/Pictures/ReporterLive/VID_10072018141402.avi.
  
  Successfully parsed a group of options.
  
  Opening an input file: /storage/emulated/0/Pictures/ReporterLive/VID_10072018141402.avi.
  
  Setting default whitelist 'file,crypto'
  
  Probing mov,mp4,m4a,3gp,3g2,mj2 score:100 size:2048
  
  Probing mp3 score:1 size:2048
  
  Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  type: 70797466 'ftyp' parent:'root' sz: 24 8 3096055
  
  ISO: File Type Major Brand: mp42
  
  type: 7461646d 'mdat' parent:'root' sz: 3093790 32 3096055
  
  type: 766f6f6d 'moov' parent:'root' sz: 2241 3093822 3096055
  
  type: 6468766d 'mvhd' parent:'moov' sz: 108 8 2233
  
  time scale = 1000
  
  type: 61746475 'udta' parent:'moov' sz: 52 116 2233
  
  type: 4e4c4453 'SDLN' parent:'udta' sz: 16 8 44
  
  type: 64726d73 'smrd' parent:'udta' sz: 16 24 44
  
  type: 61746d73 'smta' parent:'udta' sz: 12 40 44
  
  type: 6174656d 'meta' parent:'moov' sz: 119 168 2233
  
  type: 726c6468 'hdlr' parent:'meta' sz: 33 8 111
  
  ctype=  (0x00000000)
  
  stype= mdta
  
  type: 7379656b 'keys' parent:'meta' sz: 43 41 111
  
  type: 74736c69 'ilst' parent:'meta' sz: 35 84 111
  
  type: 01000000 '' parent:'ilst' sz: 27 8 27
  
  lang "   " tag "com.android.version" value "7.0" atom "" 7 3
  
  type: 6b617274 'trak' parent:'moov' sz: 1023 287 2233
  
  type: 64686b74 'tkhd' parent:'trak' sz: 92 8 1015
  
  type: 6169646d 'mdia' parent:'trak' sz: 923 100 1015
  
  type: 6468646d 'mdhd' parent:'mdia' sz: 32 8 915
  
  type: 726c6468 'hdlr' parent:'mdia' sz: 44 40 915
  
  ctype=  (0x00000000)
  
  stype= vide
  
  type: 666e696d 'minf' parent:'mdia' sz: 839 84 915
  
  type: 64686d76 'vmhd' parent:'minf' sz: 20 8 831
  
  type: 666e6964 'dinf' parent:'minf' sz: 36 28 831
  
  type: 66657264 'dref' parent:'dinf' sz: 28 8 28
  
  type url  size 12
  
  Unknown dref type 0x08206c7275 size 12
  
  type: 6c627473 'stbl' parent:'minf' sz: 775 64 831
  
  type: 64737473 'stsd' parent:'stbl' sz: 171 8 767
  
  size=155 4CC= avc1/0x31637661 codec_type=0
  
  type: 43637661 'avcC' parent:'stsd' sz: 34 8 69
  
  type: 70736170 'pasp' parent:'stsd' sz: 16 42 69
  
  type: 726c6f63 'colr' parent:'stsd' sz: 19 58 69
  
  nclx: pri 1 trc 1 matrix 1 full 0
  
  type: 73747473 'stts' parent:'stbl' sz: 304 179 767
  
  track[0].stts.entries = 36
  
  sample_count=1, sample_duration=5942
  
  .
  
  sample_count=2, sample_duration=5401
  
  type: 73737473 'stss' parent:'stbl' sz: 24 483 767
  
  keyframe_count = 2
  
  type: 7a737473 'stsz' parent:'stbl' sz: 188 507 767
  
  sample_size = 0 sample_count = 42
  
  type: 63737473 'stsc' parent:'stbl' sz: 52 695 767
  
  track[0].stsc.entries = 3
  
  type: 6f637473 'stco' parent:'stbl' sz: 28 747 767
  
  AVIndex stream 0, sample 0, offset 831f, dts 0, size 212746, distance 0, keyframe 1
  
  .
  
  AVIndex stream 0, sample 41, offset 2e28a5, dts 221935, size 68753, distance 11, keyframe 0
  
  type: 6b617274 'trak' parent:'moov' sz: 931 1310 2233
  
  type: 64686b74 'tkhd' parent:'trak' sz: 92 8 923
  
  type: 6169646d 'mdia' parent:'trak' sz: 831 100 923
  
  type: 6468646d 'mdhd' parent:'mdia' sz: 32 8 823
  
  type: 726c6468 'hdlr' parent:'mdia' sz: 44 40 823
  
  ctype=  (0x00000000)
  
  stype= soun
  
  type: 666e696d 'minf' parent:'mdia' sz: 747 84 823
  
  type: 64686d73 'smhd' parent:'minf' sz: 16 8 739
  
  type: 666e6964 'dinf' parent:'minf' sz: 36 24 739
  
  type: 66657264 'dref' parent:'dinf' sz: 28 8 28
  
  type url  size 12
  
  Unknown dref type 0x08206c7275 size 12
  
  type: 6c627473 'stbl' parent:'minf' sz: 687 60 739
  
  type: 64737473 'stsd' parent:'stbl' sz: 91 8 679
  
  size=75 4CC= mp4a/0x6134706d codec_type=1
  
  audio channels 2
  
  version =0, isom =1
  
  type: 73647365 'esds' parent:'stsd' sz: 39 8 39
  
  MPEG-4 description: tag=0x03 len=25
  
  MPEG-4 description: tag=0x04 len=17
  
  esds object type id 0x40
  
  MPEG-4 description: tag=0x05 len=2
  
  Specific MPEG-4 header len=2
  
  mp4a config channels 2 obj 2 ext obj 0 sample rate 48000 ext sample rate 0
  
  type: 73747473 'stts' parent:'stbl' sz: 32 99 679
  
  track[1].stts.entries = 2
  
  sample_count=1, sample_duration=1024
  
  sample_count=113, sample_duration=1024
  
  type: 7a737473 'stsz' parent:'stbl' sz: 476 131 679
  
  sample_size = 0 sample_count = 114
  
  type: 63737473 'stsc' parent:'stbl' sz: 52 607 679
  
  track[1].stsc.entries = 3
  
  type: 6f637473 'stco' parent:'stbl' sz: 28 659 679
  
  AVIndex stream 1, sample 0, offset 20, dts 0, size 682, distance 0, keyframe 1
  
  AVIndex stream 1, sample 1, offset 2ca, dts 1024, size 683, distance 0, keyframe 1
  
  .
  
  AVIndex stream 1, sample 99, offset 28939d, dts 101376, size 682, distance 0, keyframe 1
  
  .
  
  AVIndex stream 1, sample 113, offset 28b8f2, dts 115712, size 683, distance 0, keyframe 1
  
  on_parse_exit_offset=3096055
  
  rfps: 16.500000 0.014060
  
  rfps: 16.583333 0.003530
  
  rfps: 16.666667 0.000000
  
  rfps: 16.666667 0.000000
  
  rfps: 16.750000 0.003470
  
  rfps: 16.750000 0.003470
  
  rfps: 16.833333 0.013939
  
  rfps: 50.000000 0.000001
  
  rfps: 50.000000 0.000001
  
  Before avformat_find_stream_info() pos: 3096055 bytes read:35009 seeks:1 nb_streams:2
  
  nal_unit_type: 7, nal_ref_idc: 3
  
  nal_unit_type: 8, nal_ref_idc: 3
  
  stream 0, sample 0, dts 0
  
  .
  
  stream 1, sample 47, dts 1002667
  
  nal_unit_type: 5, nal_ref_idc: 3
  
  Reinit context to 1920x1088, pix_fmt: yuv420p
  
  All info found
  
  stream 0: start_time: 0.000 duration: 2.526
  
  stream 1: start_time: 0.000 duration: 2.432
  
  format: start_time: 0.000 duration: 2.520 bitrate=9828 kb/s
  
  After avformat_find_stream_info() pos: 246313 bytes read:281290 seeks:2 frames:48
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Pictures/ReporterLive/VID_10072018141402.avi':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2018-07-10T08:44:06.000000Z
  
      com.android.version: 7.0
  
    Duration: 00:00:02.52, start: 0.000000, bitrate: 9828 kb/s
  
      Stream #0:0(eng), 1, 1/90000: Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9551 kb/s, SAR 1:1 DAR 16:9, 16.63 fps, 16.67 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2018-07-10T08:44:06.000000Z
  
        handler_name    : VideoHandle
  
      Stream #0:1(eng), 47, 1/48000: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-07-10T08:44:06.000000Z
  
        handler_name    : SoundHandle
  
  
  
  Successfully opened the file.
  
      Parsing a group of options: output file /storage/emulated/0/Pictures/ReporterLive/VID_10072018141402_1.avi.
  
      Applying option vf (set video filters) with argument drawtext=text='Hello Dev..':fontsize=24:fontfile=/system/fonts/DroidSans.ttf:box=1:boxcolor=black@0.5:x=w-tw:y=h-th.
  
      Successfully parsed a group of options.
  
      Opening an output file: /storage/emulated/0/Pictures/ReporterLive/VID_10072018141402_1.avi.
  
      Setting default whitelist 'file,crypto'
  
      Successfully opened the file.
  
      No such filter: 'drawtext'
  
      Error opening filters!
  
      Statistics: 0 seeks, 0 writeouts
  
      Statistics: 281290 bytes read, 2 seeks

  Can anyone tell what I am doing wrong ? I want to do it in the simplest form.

• Why does ffmpeg yuv420p conversion affect pixels beyond 2x2 blocks ?

  9 novembre 2020, par Hugues

  Why does the YUV420 conversion in ffmpeg seem to operate beyond the 2x2 pixel blocks ?

  


  # Create a test image.
ffmpeg -f lavfi -i testsrc=duration=1:size=160x120:rate=1 -y original.png

# Create a new image after converting to YUV420 and back to RGB.
ffmpeg -i original.png -pix_fmt yuv420p -f rawvideo - | \
  ffmpeg -f rawvideo -pix_fmt yuv420p -s 160x120 -i - -pix_fmt rgb24 -y yuv420.png

# Compare upscaled versions of the two images.
convert original.png -interpolate Nearest -filter point -resize 800% original.scaled.png
convert yuv420.png -interpolate Nearest -filter point -resize 800% yuv420.scaled.png
display original.scaled.png yuv420.scaled.png  # press spacebar to advance


  


  Note how pixels are modified even at a distance of 2 pixels from the horizontal bar
in the lower part of the image.

  


  See the result :


  


  and closeup :