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• Cron job using database results

  9 mars 2013, par Fibericon

  I need help in creating a cron job script. Basically, I want to grab the next scheduled item and run it through ffmpeg to stream. This would be the mysql query (I'm using PHP variables to indicate what should go there - I don't actually know how variables work in cron jobs) :

  SELECT show.file FROM show, schedule
  
  WHERE channel = 1 AND start_time <= $current_time;

  This would be the ffmpeg command :

  ffmpeg -re -i $file http://127.0.0.1:8090/feed.ffm

  How would I create a cron job to execute these commands ?

• How to get audio track assignment in ffmpeg

  16 février 2012, par David542

  Is there a way to get the audio track assignment in ffmpeg ? For example, if you are in QuickTime, you can view info (Command - I), and see the track assignment. It looks something like this :

  Apple ProRes 422 (HQ), 1,920 x 1,080
  
  Linear PCM, 24 bit little-endian signed integer, 48000 Hz, **Left**
  
  Linear PCM, 24 bit little-endian signed integer, 48000 Hz, **Right**
  
  Linear PCM, 24 bit little-endian signed integer, 48000 Hz, **Center**
  
  Linear PCM, 24 bit little-endian signed integer, 48000 Hz, **LFE Screen**
  
  etc...

  When I do $ ffmpeg -i, it does not show the track assignments —

  Stream #0:12(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32, 1152 kb/s
  
  Metadata:
  
    creation_time   : 2010-09-16 02:23:49
  
    handler_name    : ?Apple Alias Data Handler
  
  Stream #0:13(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32, 1152 kb/s
  
  Metadata:
  
    creation_time   : 2010-09-16 02:23:49
  
    handler_name    : ?Apple Alias Data Handler
  
  Stream #0:14(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32, 1152 kb/s
  
  Metadata:
  
    creation_time   : 2010-09-16 02:23:49
  
    handler_name    : ?Apple Alias Data Handler
  
  Stream #0:15(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32, 2304 kb/s
  
  Metadata:
  
    creation_time   : 2010-09-16 02:23:49
  
    handler_name    : ?Apple Alias Data Handler
  
  Stream #0:16(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32, 2304 kb/s

  Is there a way to get the track assignments in ffmpeg or another program ?

• Feeding a series of images to ffmpeg as each image is created [closed]

  5 février 2013, par Mark Schneider

  I'm trying to use ffmpeg to build a 1280x720 slide-show from a sequence of pictures and videos, but I have concerns about potential disk I/O bottleneck.

  I expect a typical slide-show to have about 50 pictures and 2-3 videos (10-15 seconds each at 30 fps). I would like to show each picture for 3-4 seconds (possibly with a
  Ken Burns effect) with a smooth 2 second crossfade between each set of pictures (or for pictures adjacent to videos - between the picture and the first/last frame of the video).

  Given about 50 pictures, the crossfades alone would amount to about 3,000 images (50 transitions x 2 secs/transition x 30 fps). And I suppose if I implement a Ken Burns effect during each picture's 3-4 second showing, I'd have to provide ffmpeg with individual images for each of those frames. (I'm writing a script in Ruby that will pull a list of images from a database and in turn call ImageMagick to create the individual images for each frame. As I understand it, the RMagick library interfaces with ImageMagick such that the output images come back as in-memory objects without needing to write to disk. FWIW, I'm developing in Windows 8 and will deploy to Heroku.)

  All of the slideshow examples I've found online feed ffmpeg a set of images which have already been created. However, in an effort to avoid waiting on considerable disk I/O, I'd like to feed each image to ffmpeg as the image is created rather than create them all in advance.

  Is there a way to send each image file to ffmpeg on the fly as the file is created in memory ?