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In this work, we present the analysis of 976 814 FGKM dwarf and sub-giantstars in the TESS Full Frame Images (FFIs) of the Southern ecliptic hemisphere.We present a new pipeline, DIAmante, developed to extract optimized,multi-sector photometry from TESS FFIs and a classifier, based on the RandomForest technique, trained to discriminate plausible transiting planetarycandidates from common false positives. A new statistical model was developedto provide the probability of correct identification of the source ofvariability. We restricted the planet search to the stars located in the leastcrowded regions of the sky and identified 396 transiting planetary candidatesamong which 252 are new detections. The candidates' radius distribution rangesbetween 1 R$\rm_{\oplus}$ and 2.6 R$\rm_J$ with median value of 1 R$\rm_J$ andthe period distribution ranges between 0.25 days and 105 days with median valueof 3.8 days. The sample contains four long period candidates (P>50 days) one ofwhich is new and 64 candidates with periods between 10 and 50 days (42 newones). In the small planet radius domain (R<4 R$\rm_{\oplus}$) we found 39candidates among which 15 are new detections. Additionally, we present 15single transit events (14 new ones), a new candidate multi-planetary system anda novel candidate around a known TOI. By using {\it Gaia} dynamical constraintswe found that 70 objects show evidence of binarity. We release a catalog of theobjects we analyzed and the corresponding lightcurves and diagnostic figuresthrough the MAST and ExoFOP portals.

A search for transiting planets around FGKM dwarfs and sub-giants in the TESS Full Frame Images of the Southern ecliptic hemisphere