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• Can't get FFMPEG to convert Samsung Motion Photos from .jpg to .mp4 [closed]

  27 août 2024, par welbeebee

  I pulled a bunch of Samsung Galaxy S21 Ultra motion photos to my PC (Windows 11) for video editing, but they were in .jpg, and for some reason Microsoft Clipchamp couldn't convert them to video. But, I knew the motion photos were intact, bc Microsoft Photos was showing the MOTION option and playing the videos just fine.
So, I'm in FFMPEG just throwing everything at the wall, but can only get still MP4's out of it, with none of the video.

  


  Here's the breakdown of what I'm looking at for :
ffmpeg -i input.jpg

  


  Input #0, image2, from '20240623_233601.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 874324 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 2944x2208 [SAR 59:59 DAR 4:3], 25 fps, 25 tbr, 25 tbn


  


  So to get the whole folder converted, I'm trying :
for %i in (*.jpg) do ffmpeg -i "%i" -c:v libx264 -map 0:0 -preset veryslow -crf 18 "%~ni.mp4"

  


  But this just results in a bunch of those still MP4's I mentioned.

  


  I'm assuming the problem starts with that odd duration of 00:00:00.04, with a bitrate of 874324 kb/s, but I'm not sure. I don't understand this mjpeg video format very well at all.

  


  I been trying to work through this with copilot to no success, and so I'm turning to stackoverflow in case anyone can help me out.
Or am I going about this all the wrong way ? Let me know.

  


• ffmpeg filter dev get_video_buffer function usage

  19 juin 2018, par Michael.Ma

  I’m writing a mosaic ffmpeg filter.
  copy code from vf_vflip.c, I register a callback function get_video_buffer
  and implement it as follows :

  static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
  
  {
  
      MosaicContext *s = link->dst->priv;
  
      AVFrame *frame;
  
      int i;
  
      int j,k;
  
  
  
      frame = ff_get_video_buffer(link->dst->outputs[0], w, h);
  
      if (!frame)
  
          return NULL;
  
  
  
      if (s->w == 0 || s->h == 0)
  
          return frame;
  
  
  
      for (i = 0; i < 3; i ++) {
  
          // some trick code
  
      }
  
  
  
      return frame;
  
  }
  
  
  
  static const AVFilterPad avfilter_vf_mosaic_inputs[] = {
  
      {
  
          .name             = "default",
  
          .type             = AVMEDIA_TYPE_VIDEO,
  
          //.get_video_buffer = get_video_buffer,
  
          .filter_frame     = filter_frame,
  
          .config_props     = config_input,
  
      },
  
      { NULL }
  
  };

  But after read some filter dev guide, I found that only a few filter implement get_video_buffer funcition.The default function is f_default_get_video_buffer()
  I make some log find that ffmpeg call function like

  get_video_buffer
  
  filter_frame
  
  get_video_buffer
  
  filter_frame
  
  get_video_buffer
  
  filter_frame
  
  ...

  I’m confused about get_video_buffer do what job.
  Only know that some filter will hold frame cache.
  Can I juse comment out the get_video_buffer hook ?

  I see flip job both in get_video_buffer() and filter_frame() in vf_vflip.c
  Is it a waste of time ?

  static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
  
  {
  
      FlipContext *flip = link->dst->priv;
  
      AVFrame *frame;
  
      int i;
  
  
  
      frame = ff_get_video_buffer(link->dst->outputs[0], w, h);
  
      if (!frame)
  
          return NULL;
  
  
  
      for (i = 0; i < 4; i ++) {
  
          int vsub = i == 1 || i == 2 ? flip->vsub : 0;
  
          int height = AV_CEIL_RSHIFT(h, vsub);
  
  
  
          if (frame->data[i]) {
  
              frame->data[i] += (height - 1) * frame->linesize[i];
  
              frame->linesize[i] = -frame->linesize[i];
  
          }
  
      }
  
  
  
      return frame;
  
  }
  
  
  
  static int filter_frame(AVFilterLink *link, AVFrame *frame)
  
  {
  
      FlipContext *flip = link->dst->priv;
  
      int i;
  
  
  
      for (i = 0; i < 4; i ++) {
  
          int vsub = i == 1 || i == 2 ? flip->vsub : 0;
  
          int height = AV_CEIL_RSHIFT(link->h, vsub);
  
  
  
          if (frame->data[i]) {
  
              frame->data[i] += (height - 1) * frame->linesize[i];
  
              frame->linesize[i] = -frame->linesize[i];
  
          }
  
      }
  
  
  
      return ff_filter_frame(link->dst->outputs[0], frame);
  
  }

• FFMPEG exported video is all black

  5 mars 2024, par Kartikey

  I am trying to generate a video wall of 4 videos using ffmpeg like the given image

  


  

  


  I am exceuting this below script to get the desired result

  


  def merge_videos(output_file):
    command = [
        'path_to_ffmpeg/ffmpeg.exe',
        '-i', 'path/playblasts/front.mp4',
        '-i', 'path/playblasts/side.mp4',
        '-i', 'path/playblasts/persp1.mp4',
        '-i', 'path/playblasts/persp2.mp4',
        '-filter_complex', '[0:v][1:v][2:v][3:v]xstack=inputs=4:layout=0_0|w0_0|0_h0|w0_h0[v]',
        '-map', '[v]',
        output_file
    ]
    subprocess.run(command)


  


  where as passing output file path as argument, but I am getting below result

  


  

  


  Any help would be appreciated.
Thanks & Best Regards