I was able to successfully install GDAL onto my Mac and it responds correctly to the test command. However, when I type in a command to translate a geopdf to a geotiff it spits out a failure. I have looked high and low for the answer (I am slightly tech savvy but not overly exceptional) without either being able to find it or even understand some of the solutions. Below I am posting some of the commands I use along with the failure read out, hopefully someone can explain to me what I am doing wrong and what I can do to fix it.
Test Command I use: gdalinfo --version
Response: GDAL 2.1.2, released 2016/10/24
Translation Command I use: ogr2ogr -f "pdf" MD_Accident_20161108_TM_geo.pdf MD_Accident_20161108_TM_geo.tiff
Response: FAILURE: Unable to open datasource `MD_Accident_20161108_TM_geo.tiff' with the following drivers. -> PCIDSK -> netCDF -> JP2OpenJPEG -> JPEG2000 -> ESRI Shapefile -> MapInfo File -> UK .NTF -> OGR_SDTS -> S57 -> DGN -> OGR_VRT -> REC -> Memory -> BNA -> CSV -> NAS -> GML -> GPX -> LIBKML -> KML -> GeoJSON -> Interlis 1 -> Interlis 2 -> OGR_GMT -> GPKG -> SQLite -> OGR_DODS -> ODBC -> WAsP -> MSSQLSpatial -> OGR_OGDI -> PostgreSQL -> OpenFileGDB -> XPlane -> DXF -> Geoconcept -> GeoRSS -> GPSTrackMaker -> VFK -> PGDUMP -> OSM -> GPSBabel -> SUA -> OpenAir -> OGR_PDS -> WFS -> SOSI -> HTF -> AeronavFAA -> EDIGEO -> GFT -> SVG -> CouchDB -> Cloudant -> Idrisi -> ARCGEN -> SEGUKOOA -> SEGY -> XLS -> ODS -> XLSX -> ElasticSearch -> Carto -> AmigoCloud -> SXF -> Selafin -> JML -> PLSCENES -> CSW -> VDV -> TIGER -> AVCBin -> AVCE00 -> HTTP