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• Is -vfilter not available on Debian 5 ?

  3 octobre 2011, par Kor

  I'm getting problems trying to make my website (done in PHP) work online.
  At a specific time, I need to upload a video and convert it, also scaling its dimensions. I use a call like this one :

  ffmpeg -y -i '/path/to/video.mp4' -f flv -ab 56 -ar 22050 -r 20 -vfilter "scale=704:-1" '/path/to/new/video.flv'

  It works offline on my computer (Ubuntu 10.10), but it doesn't do the same online (Debian Lenny 5.0). The response I get from the server is :

  [Mon Oct 03 15:48:56 2011] [error] [client 81.184.6.124] /servers/path/to/ffmpeg: unrecognized option '-vfilter'

  I have also tried with '-vf', but it just doesn't work at all. So my question is, am I doing it wrong, or is it that Debian unables video filters for some reason ?

  I give you some info about this server :

  Debian 5.0
  
  PHP: 5.2.6
  
  FFmpeg r11872+debian_0.svn20080206-18+lenny1
  
  libavutil   3212800
  
  libavcodec  3355136
  
  libavformat 3409664
  
  libavdevice 3407872

  EDIT : Oh my, I just saw it. No libavfilter installed. I'll tell you what their support tells me in a couple hours.

• Asking ffmpeg to extract frames at the original frame rate

  28 septembre 2011, par intrpc

  On the ffmpeg documentation (here, and here) I read that, by default, ffmpegchoses to extract frames at 25 frames per second (otherwise you can specify a framerate with the -r option)

  My problem is that I have a folder with dozens of videos, each of them recorded at different frame rates, so my question is :

  Is there a way to ask ffmpeg to extract frames from a video at the "native" frame rate (i.e. the original frame rate at which the video was recorded) ?

  In case it matters, I am working with MP4 files

• H.264 (MP4) video not play in IE9, but will play in Safari [closed]

  27 septembre 2011, par Austin S

  I have encoded a video using FFMPEG into three formats : WebM, MP4, and FLV. Chrome, Mozilla, and theoretically Opera (although I haven't tested it) should all use the WebM version. IE9, iOS devices, and Adriod should use the MP4 container. While all legacy browsers should default back to the flash version of the file. I'm using video-js to help serve the content. The content is set to preload and autoplay.

  I have found that everything is working as intended except for IE9, where all I get is the poster image and a white dot that typically spins indicating that the file is loading however it is not spinning in this scenario. The MP4 file opens in Safari, an iPad, an iPhone, and an Andriod - verifying that the file is infact legit.

  The following is the specs for the MP4 file when I stream it using VLC. I don't know if this is particularly useful, I'm just trying to provide as much detail as possible.

  VLC Codec Details

  • Stream 0

    Type : Video

    Codec : MPEG-4 Video (mp4v)

    Language : English

    Resolution : 480x270

    Frame rate : 2997

  • Stream 1

    Type : Audio

    Codec : MPEG AAC Audio (mp4a)

    Language : English

    Channels : Stereo

    Sample rate : 48000 Hz

  When accessing videojs.com from my coworkers computer, the video on their main page wouldn't play the video correctly in IE9, but we could hear the audio. When I went to another coworkers computer it played just fine. I'm wondering if IE9, or video-js, is tempermental depending on how updated your OS is.

  The fact that I'm working on XP with IE7 is making this all the more difficult to fix, so if you have any suggestions on what could point me in the right direction, I would greatly appreciate it !

  Thanks,

  Austin S