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• Cropping black bars in video with ffmpeg on ubuntu changes video size

  9 décembre 2013, par pramod

  I have a source video size that's 720x576 with black rectangles on the top and bottom.

  I want to remove the black rectangles and set the output video size to 640x352.

  I tried -vf cropdetect and the value it gave was 640:192:0:80.

  However, putting that same value in crop=<parameter></parameter> changes the output video size.

  How can I fix this ?

  E.g. :

  ffmpeg -i all_the_best_test.mpg -s 640x352 -deinterlace -b 500k -minrate 500k \
  
  -maxrate 500k -aspect 1.82 -force_fps -vcodec libx264 -me_method 10 \
  
  -vf crop=640:192:0:80 -r 25 -acodec libfaac -ac 2 -ar 44100 -ab 96k -subq 6 \
  
  -vpre medium /vod/Movies/final/allthebest-crop-2.mp4

• Add multiple audio files to video at specific points using FFMPEG

  7 août 2012, par Pascal Beyeler

  I am trying to create a video out of a sequence of images and various audio files using FFmpeg. While it is no problem to create a video containing the sequence of images with the following command :

  ffmpeg -f image2 -i image%d.jpg video.mpg

  I haven't found a way yet to add audio files at specific points to the generated video.
  Is it possible to do something like :

  ffmpeg -f image2 -i image%d.jpg -i audio1.mp3 AT 10s -i audio2.mp3 AT 15s video.mpg

  Any help is much appreciated !

  EDIT :

  The solution in my case was to use sox as suggested by blahdiblah in the answer below. You first have to create an empty audio file as a starting point like that :

  sox -n -r 44100 -c 2 silence.wav trim 0.0 20.0

  This generates a 20 sec empty WAV file. After that you can mix the empty file with other audio files.

  sox -m silence.wav "|sox sound1.mp3 -p pad 0" "|sox sound2.mp3 -p pad 2" out.wav

  The final audio file has a duration of 20 seconds and plays sound1.mp3 right at the beginning and sound2.mp3 after 2 seconds.
  To combine the sequence of images with the audio file we can use FFmpeg.

  ffmpeg -i video_%05d.png -i out.wav -r 25 out.mp4

• Using ffmpeg to convert flv to mp4 on debian 6 [closed]

  28 mars 2013, par user1542610

  I am using ffmpeg on debian version squeeze/sid to convert flv to mp4.I need to view final output on iphone, ipad. I have tried many different combinations but have not succeeded in converting the file properly.

  Information about the sample flv file is as follows - via command ffmpeg -i sample.flv

    FFmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --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-libdc1394 --enable-shared --disable-static
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Jun 12 2012 16:27:59, gcc: 4.4.3
  
  Input #0, flv, from 'sample.flv':
  
    Duration: 00:01:06.90, start: 2.079000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 352x200, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 44100 Hz, mono, s16
  
  At least one output file must be specified

  when i try using command - ffmpeg -i sample.flv -sameq -ar 22050 sample.mp4

  I get error with following output.

  ffmpeg -i sample.flv -sameq -ar 22050 sample.mp4
  
  FFmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --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-libdc1394 --enable-shared --disable-static
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Jun 12 2012 16:27:59, gcc: 4.4.3
  
  Input #0, flv, from 'sample.flv':
  
    Duration: 00:01:06.90, start: 2.079000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 352x200, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 44100 Hz, mono, s16
  
  Output #0, mp4, to 'sample.mp4':
  
      Stream #0.0: Video: mpeg4, yuv420p, 352x200, q=2-31, 200 kb/s, 90k tbn, 1k tbc
  
      Stream #0.1: Audio: 0x0000, 22050 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Unsupported codec for output stream #0.1

  I am not very conversant with ffmpeg and any help, pointers would highly appreciated.

  Many thanks is advance.