jAlbum/Settings/Videos

Video Settings

Videos Settings give you control of the conversion process, which uses FFmpeg, from virtually all video formats to the MP4 HTML5 standard.

Basic Settings

Quality

Sets the compression level and is a compromise between video quality and file size. Start with the default setting and if the quality is not good enough raise the setting and try making the album again.

Resolution

A drop down menu lets you choose from a range of standard video resolutions such as Full HD, HD, 480p, 360p, 240p or the image bounds as set in Settings/Images. If you want a different size to any of those then you can enter values in place of $videoWidth and $videoHeight (each in two places) in ‘Use custom settings’.

Use custom settings

If you check the 'Use custom settings' box then you can configure the video conversion process, to mp4, as you want.

Advanced Settings

Variables

There are variables that you can use to aid conversion:

FFMPEG Switches

Lets now look at the default switches used with ffmpeg

Custom settings - adding a watermark

To add or delete lines right click on the line and select ‘Insert row’ or ‘Delete row’. When adding lines you need to enter the ‘Name’ and, for many options a ‘Value’.

The watermark will be centred on the video and requires an image, called logo.png, in the project's root folder. To prevent the logo appearing in the album you need to 'exclude' it. For best results the image should be a transparent png file with a low transparency value, say 40%. Note that the example below uses a Mac OS file separator ‘/‘ Windows users will need to use ‘\’

The required settings are shown below:

To change the location of the watermark you can use different values for the 'overlay' element of the 'filter_complex' entry.
Top left use overlay=10:10
Top right overlay=main_w-overlay_w-10:10
Bottom left overlay=10:H-h-10
Bottom right overlay=W-w-10:H-h-10

Custom settings - changing the volume

Another example is how to change the volume of the audio track of a video. Given changes to volumes are likely to be unique to each video this example might be be used as an interim step - that is process the original video and use the output from this as the input to your actual project.

The required settings are shown below:

Volume can be decreased by using negative numbers, you can also use 'dB' instead, e.g. volume=-6dB

FFmpeg documentation

The documentation on the options available for configuring FFmpeg is available from ffmpeg.org. There is a link, FFmpeg documentation, to that page at the bottom of the custom settings.