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• FFMpeg crop a portrait (vertical) video square 1:1

  1er avril 2022, par hugger

  SOLVED... It was a UI issue... Not an FFpeg issue.

  


  I am new to FFMpeg. I am stuck on cropping a portrait video taken from a portrait device square.

  


  I would like my video output to be 1080x1080.

  


  First, I tried this.

  


  FFmpegKit.execute(`-y -i ${media.path} -vf "crop=1080:1080:exact=1" ${path}`)


  


  As I hoped, this worked for photos. (but strangely rotates the photo) - looking into that...

  


  BUT, for videos it does not work. instead it turns the video landscape.

  


  I then tried to add scale :

  


  FFmpegKit.execute(`-y -i ${media.path} -vf "crop=1080:1080:exact=1, scale=1080:1080" ${path}`)


  


  But this left me with the same result.

  


  Here are the console logs for some more information :

  


   LOG  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file:///private/var/mobile/Containers/Data/Application/71E462FC-4824-41FE-B28D-57AF7B6078C3/tmp/ReactNative/329ACC6F-42B6-4B12-A289-889DADE1BC3A.mov':
 LOG    Metadata:
 LOG      major_brand     :
 LOG  qt
 LOG  
 LOG      minor_version   :
 LOG  0
 LOG  
 LOG      compatible_brands:
 LOG  qt
 LOG  
 LOG      creation_time   :
 LOG  2022-04-01T03:41:12.000000Z
 LOG  
 LOG    Duration:
 LOG  00:00:02.35
 LOG  , start:
 LOG  0.000000
 LOG  , bitrate:
 LOG  21200 kb/s
 LOG  
 LOG    Stream #0:0
 LOG  [0x1]
 LOG  (und)
 LOG  : Video: hevc (hvc1 / 0x31637668), yuv420p(tv, bt709), 1080x1920, 21140 kb/s
 LOG  ,
 LOG  59.96 fps,
 LOG  59.94 tbr,
 LOG  600 tbn
 LOG   (default)
 LOG  
 LOG      Metadata:
 LOG        creation_time   :
 LOG  2022-04-01T03:41:13.000000Z
 LOG  
 LOG        handler_name    :
 LOG  Core Media Video
 LOG  
 LOG        vendor_id       :
 LOG  [0][0][0][0]
 LOG  
 LOG        encoder         :
 LOG  HEVC
 LOG  
 LOG    Stream #0:1
 LOG  [0x2]
 LOG  (und)
 LOG  : Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 61 kb/s
 LOG   (default)
 LOG  
 LOG      Metadata:
 LOG        creation_time   :
 LOG  2022-04-01T03:41:13.000000Z
 LOG  
 LOG        handler_name    :
 LOG  Core Media Audio
 LOG  
 LOG        vendor_id       :
 LOG  [0][0][0][0]
 LOG  
 LOG  [hevc @ 0x118ce07d0] The "sub_text_format" option is deprecated: Deprecated, does nothing
 LOG  [aac @ 0x10d30e190] The "sub_text_format" option is deprecated: Deprecated, does nothing
 LOG  Stream mapping:
 LOG    Stream #0:0 -> #0:0
 LOG   (hevc (native) -> mpeg4 (native))
 LOG  
 LOG    Stream #0:1 -> #0:1
 LOG   (aac (native) -> aac (native))
 LOG  
 LOG  Press [q] to stop, [?] for help
 LOG  Output #0, mp4, to '/var/mobile/Containers/Data/Application/71E462FC-4824-41FE-B28D-57AF7B6078C3/Documents/after.mp4':
 LOG    Metadata:
 LOG      major_brand     :
 LOG  qt
 LOG  
 LOG      minor_version   :
 LOG  0
 LOG  
 LOG      compatible_brands:
 LOG  qt
 LOG  
 LOG      encoder         :
 LOG  Lavf59.10.100
 LOG  
 LOG    Stream #0:0
 LOG  (und)
 LOG  : Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, bt709, progressive), 1080x1080, q=2-31, 10000 kb/s
 LOG  ,
 LOG  59.94 fps,
 LOG  60k tbn
 LOG   (default)
 LOG  
 LOG      Metadata:
 LOG        creation_time   :
 LOG  2022-04-01T03:41:13.000000Z
 LOG  
 LOG        handler_name    :
 LOG  Core Media Video
 LOG  
 LOG        vendor_id       :
 LOG  [0][0][0][0]
 LOG  
 LOG        encoder         :
 LOG  Lavc59.15.102 mpeg4
 LOG  
 LOG      Side data:
 LOG  
 LOG  cpb:
 LOG  bitrate max/min/avg: 0/0/10000000 buffer size: 0
 LOG  vbv_delay: N/A
 LOG  
 LOG    Stream #0:1
 LOG  (und)
 LOG  : Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s
 LOG   (default)
 LOG  
 LOG      Metadata:
 LOG        creation_time   :
 LOG  2022-04-01T03:41:13.000000Z
 LOG  
 LOG        handler_name    :
 LOG  Core Media Audio
 LOG  
 LOG        vendor_id       :
 LOG  [0][0][0][0]
 LOG  
 LOG        encoder         :
 LOG  Lavc59.15.102 aac
 LOG  
 LOG  frame=    1 fps=0.0 q=3.6 size=       0kB time=00:00:01.06 bitrate=   0.3kbits/s speed=9.23x
 LOG  frame=   47 fps=0.0 q=2.0 size=     768kB time=00:00:01.85 bitrate=3390.0kbits/s speed=3.01x
 LOG  frame=   95 fps= 81 q=2.2 size=    1792kB time=00:00:02.32 bitrate=6313.3kbits/s speed=1.99x
 LOG  frame=  129 fps= 77 q=2.5 size=    2560kB time=00:00:02.32 bitrate=9018.9kbits/s speed=1.39x
 LOG  frame=  139 fps= 78 q=2.6 Lsize=    2953kB time=00:00:02.38 bitrate=10124.6kbits/s speed=1.34x
 LOG  video:2929kB audio:20kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
 LOG  0.136336%
 LOG  
 LOG  [aac @ 0x112820f50] Qavg: 113.412
 LOG  COMPLETED
 LOG  {}


  


  This is the result, when i replace
-i {media} with
-f lavfi -i smptebars=r=60000/1001:s=1080x1920:d=1

  


  

  


  ALMOST but not 1:1...

  


  I have not had any luck online trying to find a solution for this so I have decided to post on here.

  


  I hope I can get some guidance here !

  


  Cheers.

  


• how to set output video length from ffmpeg

  25 avril 2022, par naval Hurpade

  I'm Creating youtube video downloader using ytdl-core and ffmpeg, I'm able to combine video and audio files using ffmpeg, and files are working fine, but

  


  When I play that video video length (duration) is set to some random number like 212309854
I Already tryied ading -t flag to set time it works but I still video duration as this random number.

  


  See screenshot bellow.
And in video properties I see no length is set.

  


  module.exports = function (audio, video, selectedAudioFormat, selectedVideoFormat,res) {
  
  const ffmpegProcess = spawn(
    ffmpegInstallation.path,
    [
      '-i',
      `pipe:3`,
      '-i',
      `pipe:4`,
      '-map',
      '0:v',
      '-map',
      '1:a',
      '-c:v',
      'copy',
      '-c:a',
      'copy',
      '-crf',
      '27',
      '-preset',
      '6',
      '-movflags',
      'frag_keyframe+empty_moov',
      '-f',
      selectedVideoFormat.container,
      '-t',
      '30',
      '-loglevel',
      'info',
      '-',
    ],
    {
      stdio: ['pipe', 'pipe', 'pipe', 'pipe', 'pipe']
    }
  );
  
  
  video.pipe(ffmpegProcess.stdio[3]);
  audio.pipe(ffmpegProcess.stdio[4]);
  ffmpegProcess.stdio[1]
  .pipe(res);
  
  let ffmpegLogs = '';
  
  ffmpegProcess.stdio[2].on('data', (chunk) => {
    ffmpegLogs += chunk.toString();
  });
  
  ffmpegProcess.on('exit', (exitCode) => {
    if (exitCode === 1) {
      console.error('ERROR IN CHILD ::', ffmpegLogs);
    }
  });


  


  

  


• FFmpeg python : different length after fps changed and interpolated

  8 mai 2022, par Pablo Dawson

  For my application I'm adapting the code from the ffmpeg-python github for tensorflow streaming.

  


  It basically decodes each frame of your input, lets you process it with python, and encodes it again.

  


  To optimize things I'm adding a fps filter at the input to get half the fps, so I can process only half the frames, then interpolate frames in the encoder with minterpolate to get the original fps.

  


  My decoder looks like this :

  


  def decoder(in_filename):
args = (
    ffmpeg
    .input(in_filename)
    .filter('fps', fps=30/2)
     (... more filters in between ...)
    .output('pipe:', format='rawvideo', pix_fmt='rgb24')
    .compile()
)
return subprocess.Popen(args, stdout=subprocess.PIPE)


  


  And my encoder after processing the frames with python :

  


  def encoder(out_filename, width, height):

args = (
    ffmpeg
    .input('pipe:', format='rawvideo', pix_fmt='rgb24', s='{}x{}'.format(width, height))
    .filter('minterpolate', fps=30)
    .filter('fps',fps=30)
    .output(out_filename, pix_fmt='rgb24')
    .overwrite_output()
    .compile()
)
return subprocess.Popen(args, stdin=subprocess.PIPE)


  


  After that I horizontally stack the original input with the processed video

  


  subprocess.run("ffmpeg -i {} -i {} -filter_complex hstack=inputs=2 -pix_fmt yuv420p -c:v libx264 {}".format(in_filename,out_filename,"out.mp4"))


  


  Here's the problem : The "processed" video is faster and ends before the original. It's like they follow the same timestamp but it never actually interpolated frames. What am I doing wrong ?