Create Alternative Video Files

ResourceSpace can be configured to automatically generate a video file in a different size or format from the uploaded original. This may be particularly useful where a smaller size is required for uploading to the web.


To configure this, the following options are used (with example values for two different video types):

$ffmpeg_alternatives[0]["name"]="QuickTime H.264 WVGA";
$ffmpeg_alternatives[0]["params"]="-vcodec h264 -s wvga -aspect 16:9 -b 2500k -deinterlace -ab 160k -acodec mp3 -ac 2";

$ffmpeg_alternatives[1]["name"]="Larger FLV";
$ffmpeg_alternatives[1]["params"]="-s wvga -aspect 16:9 -b 2500k -deinterlace -ab 160k -acodec mp3 -ac 2";

Note: Before applying the above, check that the values entered, in particular the vcodec and acodec, are supported by ffmpeg ('ffmpeg -formats'). Each configuration block represents a defined size. For more information about the 'params' available, see the documentation for ffmpeg.

Additional Options

If ResourceSpace is configured with $originals_separate_storage=true; then the following configuration can be used to vary the destination of the alternative file:


The preview shown when viewing the resource may also be updated to allow selection and preview of the alternative files generated by $ffmpeg_alternatives. To make them available in the preview window, the configuration below can be added and updated to match your files:

$videojs_resolution_selection[0]["label"] = "Original";
$videojs_resolution_selection[0]["name"] = "";
$videojs_resolution_selection[1]["label"] = "Custom";
$videojs_resolution_selection[1]["name"] = "custom_size"

Note: "name" is the value specified in $ffmpeg_alternatives[]["name"]