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• Video with background image

  23 novembre 2012, par Gabriele Murari

  since my video doesn't respect the safe area i thought to make it smaller and fill the background area (the resulting video must be 720x576 px) with a still image.

  So i've created a movie out of a still image (loop_video.mpg) and then i tried to mix it with my input video using it as a watermark. Doing so i lose the audio stream that comes from my input video.

  here my code :

  ffmpeg -i loop_video.mpg -vf \"movie=input.mpg, scale=648:519 [wm];[in][wm] overlay=36:28 [out]\" -b:v 4096k -bufsize 8192k -minrate 2048k -maxrate 8192k -y -t 10 out.mpg

  So i tried to mix the two and keeping just the audio stream of my input video, and then watermarking again, but i have a significant delay between video and audio stream. It seems that the watermark starts after 1 second :

  ffmpeg -i loop_video.mpg -i input.mpg -map 0:0 -map 1:1 -vf \"movie=input.mpg, scale=648:519 [wm];[in][wm] overlay=36:28 [out]\" -b:v 4096k -bufsize 8192k -minrate 2048k -maxrate 8192k -y -t 10 out.mpg

  Someone could help me ?

  Thanks so much

• FFmpeg convert .mov to .ogv

  24 juillet 2016, par Morten Hauberg

  I have some troubles converting my .mov to a .ogg file using FFmpeg.

  This command should work, right ?

  ffmpeg -i test.mov -s 640x320 -vcodec libtheora -acodec libvorbis out.ogv

  It gives me this output

  [0] => FFmpeg version SVN-r0.5.9-4:0.5.9-1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
  [1] =>   configuration: --extra-version=4:0.5.9-1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libdirac --enable-libgsm --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libfaad --enable-libdc1394 --enable-shared --disable-static
  
  [2] =>   libavutil     49.15. 0 / 49.15. 0
  
  [3] =>   libavcodec    52.20. 1 / 52.20. 1
  
  [4] =>   libavformat   52.31. 0 / 52.31. 0
  
  [5] =>   libavdevice   52. 1. 0 / 52. 1. 0
  
  [6] =>   libavfilter    0. 4. 0 /  0. 4. 0
  
  [7] =>   libswscale     0. 7. 1 /  0. 7. 1
  
  [8] =>   libpostproc   51. 2. 0 / 51. 2. 0
  
  [9] =>   built on Jun 10 2012 08:33:06, gcc: 4.4.5
  
  [10] => 
  
  [11] => Seems stream 0 codec frame rate differs from container frame rate: 1200.00 (1200/1) -> 30.00 (30/1)
  
  [12] => Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
  
  [13] =>   Duration: 00:00:06.26, start: 0.000000, bitrate: 809 kb/s
  
  [14] =>     Stream #0.0(und): Video: h264, yuv420p, 480x360, 30 tbr, 600 tbn, 1200 tbc
  
  [15] =>     Stream #0.1(und): Audio: aac, 44100 Hz, mono, s16
  
  [16] => Output #0, ogg, to 'out.ogv':
  
  [17] =>     Stream #0.0(und): Video: libtheora, yuv420p, 640x320, q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
  [18] =>     Stream #0.1(und): Audio: vorbis, 44100 Hz, mono, s16, 64 kb/s
  
  [19] => Stream mapping:
  
  [20] =>   Stream #0.0 -> #0.0
  
  [21] =>   Stream #0.1 -> #0.1
  
  [22] => Press [q] to stop encoding

  It seems right, right ?

  But the movie is only about 1 second long.
  Why is that ?

  I do not have access to ffmpeg2theora, so please dont suggest that :)

• How to convert a Video to a Slideshow with synced audio ? [closed]

  25 mai 2013, par Henry Mazza

  I want a simple way to convert a Ted Talk Presentation to a SlideShow + (synced)Audio format so I can listen to it in my car. I don't want to lose most of the visuals as it does in the audio format and also want to reduce the storage/cell data needs of the video format.

  So far I already extracted the key scenes with timing and the audio, now I must glue this together in a synced fashion.

  Possible ways I found but couldn't make work :

  • MP4Box to make a .m4b (audiobook/enhanced podcast) with mp4chap to set each image as a chapter image (but I could find proper documentation on how to do this)
  • FFMPEG to make a flat movie with the images (but I couldn't make each image stay for a random period of time)

  Ultimately I will automate this process in my VPS and make my private podcast server, so no fancy tools that don't work in Linux, please.

  EDIT : actually the Podcast is a lousy idea, the artwork must be in a square aspect ratio and has great compatibility problems with varius players. Still studing the Book format.