If you are trying to "fix" a video recorded on a Sony SxS card that won't play or is corrupted: Media Restore Function
ffmpeg -i corruptfile.mp4 -c copy -map 0 fixedfile.mp4 hindi sxs video fix
SXS is not like SD card. Do not run chkdsk or Disk Utility on an SXS card. It will destroy the XDCAM structure permanently. If you are trying to "fix" a video