[FFmpeg-user] upscaling a single DASH segment

[Qian Li]

Hello,


I am a newbie of FFmpeg. I am trying to upscale a single video segment (downloaded by a DASH client from a DASH server) to a higher resolution. I tried the copy and scale filters, but both of them gave the following errors:


[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55f1d6eeb8e0] could not find corresponding track id 1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55f1d6eeb8e0] could not find corresponding trex
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55f1d6eeb8e0] error reading header
BigBuckBunny_4s1.m4s: Invalid data found when processing input

The following is the meta data of BigBuckBunny_4s1.m4s generated by mp4dump

?[styp] size=8+16
[sidx] size=12+32
  reference_ID = 1
  timescale = 96
  earliest_presentation_time = 0
  first_offset = 0
[moof] size=8+464
  [mfhd] size=12+4
    sequence number = 1
  [traf] size=8+440
    [tfhd] size=12+4, flags=20000
      track ID = 1
    [tfdt] size=12+4
      base media decode time = 0
    [trun] size=12+396, flags=205
      sample count = 96
      data offset = 480
      first sample flags = 0
[mdat] size=8+21112

The following is the meta data of the init.mp4 file
[ftyp] size=8+20
  major_brand = iso5
  minor_version = 1
  compatible_brand = avc1
  compatible_brand = dash
  compatible_brand = iso5
[free] size=8+50
[moov] size=8+783
...

Could you give me a hint on what is wrong and how to upscale a single DASH segment?

Thanks in advance!

Best regards,
Qian