java – FFmpeg conversion failed Issue

I’m trying to convert a video file using FFmpeg, but the process fails and shows some errors that I don’t fully understand the cause of. How can I avoid the error and fix the issue? Below is the command I used and the output I received.

Command:
[-y, -hide_banner, -i, saf:7.VOB, -map, 0:3, -c:s:0, dvdsub, -map, 0:2, -map, 0:1, -f, mp4, -vcodec, copy, -map_metadata, 0:g, -acodec, aac, -async, 1, saf:8.mp4]

ErrorMessage:

Input #0, mpeg, from 'saf:12.VOB':
  Duration: 00:00:21.99, start: 0.280633, bitrate: 7147 kb/s
  Stream #0:0[0x1bf]: Data: dvd_nav_packet
  Stream #0:1[0x1e0]: Video: mpeg2video, yuv420p(tv, top first), 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 7816000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:2[0xa0]: Audio: pcm_dvd, 48000 Hz, stereo, s16, 1536 kb/s
  Stream #0:3[0x20]: Subtitle: dvd_subtitle
  Stream #0:4[0x21]: Subtitle: dvd_subtitle

Stream mapping:
  Stream #0:3 -> #0:0 (dvd_subtitle (dvdsub) -> dvd_subtitle (dvdsub))
  Stream #0:2 -> #0:1 (pcm_dvd (native) -> aac (native))
  Stream #0:1 -> #0:2 (copy)

Press [q] to stop, [?] for help

Output #0, mp4, to 'saf:13.mp4':
  Metadata:
    encoder         : Lavf60.3.100
  Stream #0:0: Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x480
    Metadata:
      encoder         : Lavc60.3.100 dvdsub
  Stream #0:1: Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc60.3.100 aac
  Stream #0:2: Video: mpeg2video (mp4v / 0x7634706D), yuv420p(tv, top first), 720x480 [SAR 32:27 DAR 16:9], q=2-31, 29.97 fps, 29.97 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 7816000/0/0 buffer size: 1835008 vbv_delay: N/A

frame=   15 fps=0.0 q=-1.0 size=       0kB time=00:00:00.73 bitrate=   0.5kbits/s speed= 212x    
frame=  577 fps=0.0 q=-1.0 size=    5120kB time=00:00:19.18 bitrate=2186.2kbits/s speed=38.1x    

[dvdsub @ 0xb400006ffb03dde0] canvas_size(0:0) is too small(719:479) for render
[sost#0:0/dvdsub @ 0xb400006feaec5730] Subtitle encoding failed
[aac @ 0xb400006ffb02f500] Qavg: 36253.348
[aac @ 0xb400006ffb02f500] 2 frames left in the queue on closing

Conversion failed!