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• Create stopmotion video with ffmpeg - error while rendering

  30 May 2012, by Niklas

  I'm currently creating a stopmotion video with the help of ffmpeg and some scripts I've made. Although in the last clip I attempted to render I had a couple of frames which I've edited. The method I'm using has worked before so I'm certain that it has to do with GIMP changing something with the files. I work with .png-images. This is the command and the output I get:

  ffmpeg -sameq -f image2 -r 7 -i "$src_dir/frame-%06d.png" -r 25 "$dest_dir/$file_name.avi"

  output:

  ffmpeg version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2000-2011 the Libav developers
  
    built on Mar 22 2012 05:09:06 with gcc 4.6.3
  
  This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes).
  
  Input #0, image2, from '/mnt/storage/selected_frames/005-Middag-Animation/frame-%06d.png':
  
    Duration: 00:00:02.85, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: png, bgra, 1280x720, 7 fps, 7 tbr, 7 tbn, 7 tbc
  
  File '/mnt/storage/Videoklipp//005-Middag-Animation.avi' already exists. Overwrite ? [y/N] y
  
  Incompatible pixel format 'bgra' for codec 'mpeg4', auto-selecting format 'yuv420p'
  
  [buffer @ 0x1b88860] w:1280 h:720 pixfmt:bgra
  
  [avsink @ 0x1b8a480] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x1b8ab80] w:1280 h:720 fmt:bgra -> w:1280 h:720 fmt:yuv420p flags:0x4
  
  Output #0, avi, to '/mnt/storage/Videoklipp//005-Middag-Animation.avi':
  
    Metadata:
  
      ISFT            : Lavf53.21.0
  
      Stream #0.0: Video: mpeg4, yuv420p, 1280x720, q=2-31, 2 kb/s, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  [buffer @ 0x1b88860] Changing frame properties on the fly is not supported.
  
      Last message repeated 6 times
  
  frame=   13 fps=  0 q=0.0 Lsize=     524kB time=2.20 bitrate=1951.2kbits/s    
  
  video:517kB audio:0kB global headers:0kB muxing overhead 1.323318%

  "[buffer @ 0x1b88860] Changing frame properties on the fly is not supported"

  What can I do to fix this? Any help is appreciated :)

• Usage FFmpeg command to capture video from Apple device camera and to get 3 outputs with different resolutions (UHD, FHD, HD)

  12 December 2019, by Levon Gharibyan

  I use mobile-FFmpeg to execute FFmpeg commands (https://github.com/tanersener/mobile-ffmpeg).

  I am using AVFoundation, and trying to get 3 output files (3840x2160, 1920x1080 and 1280x720) from device camera.
  Here is the command:

  -f videotoolbox -f avfoundation -video_size 3840x2160 -r 30 -pixel_format nv12 -i "0:0"  -c:v h264_videotoolbox -b:v 8M -maxrate 8M -s 3840x2160 output1/path -c:v h264_videotoolbox -b:v 8M -maxrate 8M -s 1920x1080 output2/path -c:v h264_videotoolbox -b:v 8M -maxrate 8M -s 1280x720 output3/path

  But the encoding process is very slow (0.3x-0.4x speed) with that command and as a result, I can’t record realtime 30fps outputs. What am I doing wrong? All my tests were done on the iPhone 7.

• I want live stream 1 folder on youtube by ffmpeg

  19 October 2017, by Duy Hoàng

  I have code for live any video, but I don’t know how to live 1 folder have several videos.

  ffmpeg -re -stream_loop -1 -i "1.mp4" -vcodec libx264 -preset veryfast -maxrate 2000k -bufsize 1000k -vf “scale=1280:720,format=yuv420p” -g 50 -acodec libmp3lame -b:a 128k -ac 2 -ar 44100 -f flv rtmp://a.rtmp.youtube.com/live2/*****