support mdat size 0

[3052]

> mp4ff-info out.m4v
2024/01/02 18:27:50 Size 0, meaning to end of file, not supported

other tools work as expected:

> mp4tool dump out.m4v
[ftyp] Size=40 ... (use "-full ftyp" to show all)
[moov] Size=1866
  [mvhd] Size=108 ... (use "-full mvhd" to show all)
  [meta] Size=148 Version=0 Flags=0x000000
    [hdlr] Size=32 Version=0 Flags=0x000000 PreDefined=0 HandlerType="ID32" Name=""
    [ID32] (unsupported box type) Size=104 Data=[...] (use "-full ID32" to show all)
  [trak] Size=598
    [tkhd] Size=92 ... (use "-full tkhd" to show all)
    [mdia] Size=462
      [mdhd] Size=32 Version=0 Flags=0x000000 CreationTimeV0=3778274330 ModificationTimeV0=3778274330 Timescale=24000 DurationV0=0 Language="eng" PreDefined=0
      [hdlr] Size=45 Version=0 Flags=0x000000 PreDefined=0 HandlerType="vide" Name="VideoHandler"
      [minf] Size=377
        [dinf] Size=36
          [dref] Size=28 Version=0 Flags=0x000000 EntryCount=1
            [url ] Size=12 Version=0 Flags=0x000001
        [stbl] Size=313
          [stsd] Size=237 Version=0 Flags=0x000000 EntryCount=1
            [encv] Size=221 ... (use "-full encv" to show all)
              [avcC] Size=55 ... (use "-full avcC" to show all)
              [sinf] Size=80
                [frma] Size=12 DataFormat="avc1"
                [schm] Size=20 Version=0 Flags=0x000000 SchemeType="cenc" SchemeVersion=0x10000
                [schi] Size=40
                  [tenc] Size=32 ... (use "-full tenc" to show all)
          [stts] Size=16 Version=0 Flags=0x000000 EntryCount=0 Entries=[]
          [stsc] Size=16 Version=0 Flags=0x000000 EntryCount=0 Entries=[]
          [stsz] Size=20 Version=0 Flags=0x000000 SampleSize=0 SampleCount=0 EntrySize=[]
          [stco] Size=16 Version=0 Flags=0x000000 EntryCount=0 ChunkOffset=[]
        [vmhd] Size=20 Version=0 Flags=0x000001 Graphicsmode=0 Opcolor=[0, 0, 0]
    [edts] Size=36
      [elst] Size=28 Version=0 Flags=0x000000 EntryCount=1 Entries=[{SegmentDurationV0=0 MediaTimeV0=2002 MediaRateInteger=1}]
  [mvex] Size=56
    [mehd] Size=16 Version=0 Flags=0x000000 FragmentDurationV0=187787600
    [trex] Size=32 Version=0 Flags=0x000000 TrackID=1 DefaultSampleDescriptionIndex=1 DefaultSampleDuration=1001 DefaultSampleSize=0 DefaultSampleFlags=0x0
  [pssh] Size=88 ... (use "-full pssh" to show all)
  [pssh] Size=860 ... (use "-full pssh" to show all)
[styp] Size=40 ... (use "-full styp" to show all)
[sidx] Size=44 ... (use "-full sidx" to show all)
[moof] Size=4177
  [mfhd] Size=16 Version=0 Flags=0x000000 SequenceNumber=1
  [traf] Size=4153
    [tfhd] Size=24 Version=0 Flags=0x02000a TrackID=1 SampleDescriptionIndex=1 DefaultSampleDuration=1001
    [tfdt] Size=16 Version=0 Flags=0x000000 BaseMediaDecodeTimeV0=0
    [saiz] Size=17 Version=0 Flags=0x000000 DefaultSampleInfoSize=16 SampleCount=144
    [saio] Size=20 Version=0 Flags=0x000000 EntryCount=1 OffsetV0=[1873]
    [trun] Size=1748 ... (use "-full trun" to show all)
    [senc] (unsupported box type) Size=2320 Data=[...] (use "-full senc" to show all)
[mdat] Size=4231358 Data=[...] (use "-full mdat" to show all)

https://github.com/abema/go-mp4/tree/master/cmd/mp4tool

[tobbee]

Yes, that is not supported. I don't consider it an important case. Do you have a common use case?

[3052]

closing for now, #311 is prob a better focus