Changes between Initial Version and Version 1 of Ticket #7287, comment 2


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Timestamp:
Jun 29, 2018, 2:40:14 PM (12 months ago)
Author:
macdavis
Comment:

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  • Ticket #7287, comment 2

    initial v1  
     1Replying to [comment:1 bpa]:
     2
    13Nah, this sample was encoded by MacOS (perhaps Core Audio?)
     4
     5> The problem starts with the input file.  The "alac" atom says the file has 16 bit samples (i.e. SampleSize field).  I have just found this exact bug in ffmpeg when creating 24 bit ALAC file and was about to file a report.  Was Untitledsample_24_bit_alac.m4a created by ffmpeg ?
     6>
     7> Selected output from mp4file.
     8>     "Untitledsample_24_bit_alac.m4a": type stbl (moov.trak.mdia.minf.stbl)
     9>       "Untitledsample_24_bit_alac.m4a": type stsd (moov.trak.mdia.minf.stbl.stsd)
     10>        "Untitledsample_24_bit_alac.m4a": version = 0 (0x00)
     11>        "Untitledsample_24_bit_alac.m4a": flags = 0 (0x000000)
     12>        "Untitledsample_24_bit_alac.m4a": entryCount = 1 (0x00000001)
     13>        "Untitledsample_24_bit_alac.m4a": type alac (moov.trak.mdia.minf.stbl.stsd.alac)
     14>         "Untitledsample_24_bit_alac.m4a": reserved1 = <6 bytes>  00 00 00 00 00 00  |......|
     15>         "Untitledsample_24_bit_alac.m4a": dataReferenceIndex = 1 (0x0001)
     16>         "Untitledsample_24_bit_alac.m4a": soundVersion = 0 (0x0000)
     17>         "Untitledsample_24_bit_alac.m4a": reserved2 = <6 bytes>  00 00 00 00 00 00  |......|
     18>         "Untitledsample_24_bit_alac.m4a": channels = 2 (0x0002)
     19>         "Untitledsample_24_bit_alac.m4a": sampleSize = 16 (0x0010)
     20>         "Untitledsample_24_bit_alac.m4a": compressionId = 0 (0x0000)
     21>         "Untitledsample_24_bit_alac.m4a": packetSize = 0 (0x0000)
     22>         "Untitledsample_24_bit_alac.m4a": timeScale = 2890137600 (0xac440000)
     23>         "Untitledsample_24_bit_alac.m4a": type alac (moov.trak.mdia.minf.stbl.stsd.alac.alac)
     24>          "Untitledsample_24_bit_alac.m4a": decoderConfig = <28 bytes>