chamilo-lms2/app/config/sonata/sonata_media.yml

sonata_media:
    class:
        media: Chamilo\MediaBundle\Entity\Media
        gallery: Chamilo\MediaBundle\Entity\Gallery
        gallery_has_media: Chamilo\MediaBundle\Entity\GalleryHasMedia
        category: Chamilo\ClassificationBundle\Entity\Category

    db_driver: doctrine_orm # | doctrine_mongodb
    default_context: default
    contexts:
        default:  # the default context is mandatory
            download:
                mode: http # X-Sendfile | http
            providers:
                - sonata.media.provider.dailymotion
                - sonata.media.provider.youtube
                - sonata.media.provider.image
                - sonata.media.provider.file
                - sonata.media.provider.vimeo

            formats:
                small: { width: 100, quality: 100}
                big:   { width: 970 , quality: 100}

        course:
            providers:
                - sonata.media.provider.dailymotion
                - sonata.media.provider.youtube
                - sonata.media.provider.image
                - sonata.media.provider.file
                - sonata.media.provider.vimeo
            formats:
                  small: { width: 100, quality: 100}
                  big:   { width: 970 , quality: 100}
        news:
            providers:
                - sonata.media.provider.dailymotion
                - sonata.media.provider.youtube
                - sonata.media.provider.image

            formats:
                abstract: { width: 100, quality: 100}
                wide:     { width: 820, quality: 100}

        sonata_collection:
            providers:
              - sonata.media.provider.image

            formats:
                preview: { width: 100, quality: 100}
                wide:    { width: 820, quality: 100}

        sonata_category:
            providers:
              - sonata.media.provider.image

            formats:
                preview: { width: 100, quality: 100}
                wide:    { width: 820, quality: 100}

        user:
            providers:
              - sonata.media.provider.image

            formats:
                small: { width: 100, quality: 100}
                big:   { width: 970 , quality: 100}

    cdn:
        # define the public base url for the uploaded media
        server:
            path: %url_append%%sonata_media.cdn.host%

    filesystem:
        # define where the uploaded file will be stored
        local:
            directory:  %kernel.root_dir%/../web/uploads/media
            create:     true

    providers:
        # ...
        file:
            # the resizer must be set to false, otherwhise this can delete icon files from the fs
            resizer:    false
        image:
           thumbnail: sonata.media.thumbnail.format          # default value
#           thumbnail: sonata.media.thumbnail.consumer.format # can be used to dispatch the resize action to async task
#            thumbnail: sonata.media.thumbnail.liip_imagine    # use the LiipImagineBundle to resize the image
        vimeo:
            thumbnail: sonata.media.thumbnail.format          # default value
#           thumbnail: sonata.media.thumbnail.consumer.format # can be used to dispatch the resize action to async task
#           thumbnail: sonata.media.thumbnail.liip_imagine    # use the LiipImagineBundle to resize the image
        youtube:
            thumbnail: sonata.media.thumbnail.format          # default value
#           thumbnail: sonata.media.thumbnail.consumer.format # can be used to dispatch the resize action to async task
#           thumbnail: sonata.media.thumbnail.liip_imagine    # use the LiipImagineBundle to resize the image
        dailymotion:
            thumbnail: sonata.media.thumbnail.format          # default value
#           thumbnail: sonata.media.thumbnail.consumer.format # can be used to dispatch the resize action to async task
#           thumbnail: sonata.media.thumbnail.liip_imagine    # use the LiipImagineBundle to resize the image

    pixlr:
        enabled:  true
        referrer: App

    resizer:
        simple:
#            mode:  outbound
            mode:  inset

#
# The LiipImagineBundle can be used if you want to convert on demand an image
# to a specific format. (ie a controller render the file)
#    more information can be found here : https://github.com/liip/LiipImagineBundle
#
#liip_imagine:
#    filter_sets:
#
#        # this configuration match the sonata_media configuration format definition
#        sonata_product_preview:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [100, 100], mode: outbound }
#
#        sonata_product_small:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [200, 100], mode: outbound }
#
#        sonata_product_large:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [600, 100], mode: outbound }
#
#        news_abstract:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [100, 100], mode: outbound }
#
#        news_wide:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [820, 100], mode: outbound }
#
#        sonata_collection_preview:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [100, 100], mode: outbound }
#
#        sonata_collection_wide:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [820, 100], mode: outbound }
#
#        sonata_category_preview:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [100, 100], mode: outbound }
#
#        sonata_category_wide:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [820, 100], mode: outbound }
#
#        default_small:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [100, 100], mode: outbound }
#
#        default_big:
#            quality: 75
#            controller_action: 'SonataMediaBundle:Media:liipImagineFilter'
#            filters:
#                thumbnail: { size: [820, 70], mode: outbound }