All the datasets consist of videos where only one speaker is in front of the camera. The descriptors we used for each of the modalities are as follows: Language All the datasets provide manual transcriptions. Vision Facet BIBREF26 is used to extract a set of features including per-frame basic and advanced emotions and facial action units as indicators of facial muscle movement. Acoustic We use COVAREP BIBREF27 to extract low level acoustic features including 12 Mel-frequency cepstral coefficients (MFCCs), pitch tracking and voiced/unvoiced segmenting features, glottal source parameters, peak slope parameters and maxima dispersion quotients. 
 Question: What modalities are being used in different datasets?
Language Vision Acoustic