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• FFMPEG, itsoffset with overlay command not working as it supposed to

  14 janvier 2014, par G.T.

  I managed to overlay two videos one by another with the overlay command and use a nullsrc command to play both video till both of them ended with the following command :

  ./ffmpeg -i first.MOV -i second.MOV -filter_complex "nullsrc=size=1280x400:duration=30[bg];[0]scale=640:-1,pad=1280:400[first];[bg][first]overlay=0:0[base];[1]scale=640:-1[second];[base][second]overlay=640:0" output.mp4

  Now what I wanted to do is to delay one of the overlay till the other one finishes. For this as far as I know the command is itsoffset, so I modified to use this :

  ./ffmpeg -i first.MOV -itsoffset 5 -i second.MOV -filter_complex "nullsrc=size=1280x400:duration=30[bg];[0]scale=640:-1,pad=1280:400[first];[bg][first]overlay=0:0[base];[1]scale=640:-1[second];[base][second]overlay=640:0" output.mp4

  Now my only problem with this is that I want to show the first frame of the delayed video till it starts... And even though somewhere I read that this should do it, it won't. It leaves it blank till the input starts.

  Any idea how could I add the first frame of second video till the itsoffset starts the video ?

  Update1 : I may found a cheat around it, but the problem with it it's really slow in the first second or so.

  ./ffmpeg -i first.MOV -i second.MOV -itsoffset 5 -i second.MOV -filter_complex "color=size=1280x400:duration=30[bg];[1]select=eq(n\,0),scale=640:-1[fg];[bg][fg]overlay=640:0[bgc];[0]scale=640:-1[first];[bgc][first]overlay=0:0[firstb];[2]scale=640:-1[second];[firstb][second]overlay=640:0" output.mp4

  Not to mention later on I need to dynamically create the command line string which would be really painful like this.

• FFMPEG, itsoffset with overlay command

  9 janvier 2014, par G.T.

  I managed to overlay two videos one by another with the overlay command and use a nullsrc command to play both video till both of them ended with the following command :

  ./ffmpeg -i first.MOV -i second.MOV -filter_complex "nullsrc=size=1280x400:duration=30[bg];[0]scale=640:-1,pad=1280:400[first];[bg][first]overlay=0:0[base];[1]scale=640:-1[second];[base][second]overlay=640:0" output.mp4

  Now what I wanted to do is to delay one of the overlay till the other one finishes. For this as far as I know the command is itsoffset, so I modified to use this :

  ./ffmpeg -i first.MOV -itsoffset 5 -i second.MOV -filter_complex "nullsrc=size=1280x400:duration=30[bg];[0]scale=640:-1,pad=1280:400[first];[bg][first]overlay=0:0[base];[1]scale=640:-1[second];[base][second]overlay=640:0" output.mp4

  Now my only problem with this is that I want to show the first frame of the delayed video till it starts... And even though somewhere I read that this should do it, it won't. It leaves it blank till the input starts.

  Any idea how could I add the first frame of second video till the itsoffset starts the video ?

• Convert video to animated GIF with FFmpeg [migrated]

  5 janvier 2014, par flexage

  I have FFmpeg installed and working on my Ubuntu 12.04 LTS Server.

  I have managed to successfully automate the process of uploading a video and converting it to both H264/MP4 and OGV for display on the web.

  I also wanted to generate an animated GIF thumbnail for the video.

  I have got as far as the following, which I'm pretty sure is generating 2 frames a second for the first 10 seconds of the video :

  /usr/local/bin/ffmpeg -i "$3/uploads/video-queue/$1.$2" -vf scale=320:-1 -t 10 -r 2 "$3/uploads/video-queue/processing/$1.gif"

  What I would prefer to do is generate 1 frame every 25 seconds for the duration of the entire video, but also with a maximum number of frames set as something like 50 frames.

  I would prefer not to have dependencies on other components such as Image Magik, and I would like to keep this purely shell based.

  Thanks in advance ! You guys are way smarter than me for sure !

  Here is the complete console output from an ffmpeg run of the command above :

  root@ubuntu:/home/fckster/etc/php5# /home/fckster/public_html/cronscripts/process-video-gif.sh 1-1388841621 wmv /home/fckster/public_html
  
  ffmpeg version N-59480-g8feaa83-syslint Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan  2 2014 00:32:20 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --prefix=/usr/local/cpffmpeg --enable-shared --enable-nonfree --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-decoder=liba52 --enable-libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --extra-cflags=-I/usr/local/cpffmpeg/include/ --extra-ldflags=-L/usr/local/cpffmpeg/lib --enable-version3 --extra-version=syslint
  
    libavutil      52. 59.100 / 52. 59.100
  
    libavcodec     55. 47.100 / 55. 47.100
  
    libavformat    55. 22.102 / 55. 22.102
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  0.103 /  4.  0.103
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [wmv3 @ 0x24dd680] Extra data: 8 bits left, value: 0
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, asf, from '/home/fckster/public_html/uploads/video-queue/1-1388841621.wmv':
  
    Metadata:
  
      WM/ToolName     : Flip4Mac WMV Export Component for QuickTime (Mac)
  
      WM/ToolVersion  : 2204
  
      encoder         : Lavf54.29.104
  
    Duration: 00:01:11.30, start: 0.140000, bitrate: 2096 kb/s
  
      Stream #0:0: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 1280x720, 29.97 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp, 48 kb/s
  
  [wmv3 @ 0x24dd680] Extra data: 8 bits left, value: 0
  
  Output #0, gif, to '/home/fckster/public_html/uploads/video-queue/processing/1-1388841621.gif':
  
    Metadata:
  
      WM/ToolName     : Flip4Mac WMV Export Component for QuickTime (Mac)
  
      WM/ToolVersion  : 2204
  
      encoder         : Lavf55.22.102
  
      Stream #0:0: Video: gif, pal8, 320x180, q=2-31, 200 kb/s, 100 tbn, 10 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (wmv3 -> gif)
  
  Press [q] to stop, [?] for help
  
  frame=   87 fps= 52 q=0.0 Lsize=    2131kB time=00:00:10.00 bitrate=1745.9kbits/s dup=0 drop=170    
  
  video:2219kB audio:0kB subtitle:0 global headers:0kB muxing overhead -3.939009%