Some times character encoding in title and description is not correct

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Previews for some links contain characters that are not encoded correctly.
Examples:
Link: http://av.watch.impress.co.jp/docs/news/20141016_671560.html?ref=twitter
Preview:

{ url: 'http://av.watch.impress.co.jp/docs/news/20141016_671560.html?ref=twitter',
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  title: 'Android 5.0���ڂ�4K/30p+���w���u���␳�́uNexus 6�v - AV Watch',
  description: '�@��Google��15��(���n����)�AAndroid OS�̍ŐV�o�[�W����Android 5.0 Lollipop(�R�[�h�l�[��Android L)�ƁA��OS���̗p�������g���[�����X�}�[�g�t�H���uNexus 6�v�ƁAHTC�^�u���b�g�uNexus 9�v�𔭕\\�����B�č��ł�Nexus 9�̗\\����10��17�������J�n���A11��3���ɔ����BNexus 6��10�����{�ɗ\\���J�n���A11���ɔ��������B���{�ł��u�ߓ������v�ƈē������Ă����B',
  contentType: 'text/html',
  mediaType: 'article',
  images: [ 'http://av.watch.impress.co.jp/img/avw/docs/671/560/nexus6_s.jpg' ],
  videos: undefined,
  audios: undefined }

Link: http://www.lookmavideo.fr/people/video/il-seche-les-cours-et-fait-signer-son-mot-d-excuse-par-francois-hollande-13135.html
Preview:

{ url: 'http://www.lookmavideo.fr/people/video/il-seche-les-cours-et-fait-signer-son-mot-d-excuse-par-francois-hollande-13135.html',
  loadFailed: false,
  title: 'Vid�o Il s�che les cours et fait signer son mot d\'excuse par Fran�ois Hollande - Vid�o People - Look Ma Video.fr',
  description: 'Des lyc�ens ont s�ch� une journ�e de cours pour venir saluer le Pr�sident de la R�publique lors d\'un d�placement � Angoul�me. Et pour justifier leur absence,...',
  contentType: 'text/html',
  mediaType: 'article',
  images: [ 'http://www.lookmavideo.fr/images/hollande-mot-excuse.11.10.2014-fb.png' ],
  videos: undefined,
  audios: undefined }