A little razor template snippet that re-saves/republishes all media in Umbraco

MediaSave.cshtml

@using Umbraco.Core.Models;

@{
    var mediaService = ApplicationContext.Current.Services.MediaService;

    SaveMedias(mediaService.GetRootMedia().ToList());
}

@functions
{
    public void SaveMedias(List<IMedia> medias)
    {
        var _mediaService = ApplicationContext.Current.Services.MediaService;

        if (medias == null || !medias.Any())
            return;

        foreach (IMedia media in medias)
        {
            _mediaService.Save(media);

            SaveMedias(media.Children().ToList());

            Response.Write(media.Name + " saved at:" + media.UpdateDate + "<br />");

        }
    }
}