hi all im using this command i just want the source to be playable on a blueray player/TV (NEEDS 1920x1080i)-any suggestions?
ffmpeg -ss 00:35:00 -t 00:00:10 -i python.webm -vf scale=1920x1080 -crf 25 -preset ultrafast videolong.mp4
__________________________________________________________________________________________________________
COMMAND USED 
hob@bhobbi~/Desktop/originals$ ffprobe -hide_banner python.webm 
Input #0, matroska,webm, from 'python.webm':
  Metadata:
    ENCODER         : Lavf58.76.100
  Duration: 15:57:47.48, start: -0.007000, bitrate: 3777 kb/s
  Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 3840x2160, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 1k tbn (default)
    Metadata:
      DURATION        : 15:57:47.458000000
  Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
    Metadata:
      DURATION        : 15:57:47.481000000
__________________________________________________________________________________________________________
Working on Blueray Player
COMMAND USED 
ffmpeg -ss 00:35:00 -t 00:00:10 -i python.webm -vf scale=1920x1080 -crf 50 -preset ultrafast videolong.mp4

~/Desktop/originals$ ffprobe -hide_banner videolong2.mp4 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videolong2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.27.100
  Duration: 00:00:10.00, start: 0.000000, bitrate: 2417 kb/s
  Stream #0:0[0x1](eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 2284 kb/s, 24 fps, 24 tbr, 12288 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.37.100 libx264
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]