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  1. Hi.

    Have some audio files (.aac) that is downloaded from youtube via an firefox extension.

    There seems to be two types of aac files, based on the output from ffmpeg -i command.

    Example 1 (most common)
    Code:
    ffmpeg -i 'Track 1.aac' -hide_banner
    [aac @ 0x55a6ce64db00] Estimating duration from bitrate, this may be inaccurate
    Input #0, aac, from 'Track 1.aac':
      Duration: 00:05:42.05, bitrate: 122 kb/s
        Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 122 kb/s
    At least one output file must be specified
    Example 2
    Code:
    ffmpeg -i 'Track 2.aac' -hide_banner
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Track 2.aac':
      Metadata:
        major_brand     : dash
        minor_version   : 0
        compatible_brands: iso6mp41
        creation_time   : 2018-09-17T20:30:35.000000Z
      Duration: 00:07:54.80, start: 0.000000, bitrate: 127 kb/s
        Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
        Metadata:
          creation_time   : 2018-09-17T20:30:35.000000Z
          handler_name    : SoundHandler
    At least one output file must be specified
    It seems that one file have metadata while the other have none. Is there other differences?
    Quote Quote  
  2. DECEASED
    Join Date
    Jun 2009
    Location
    Heaven
    Search Comp PM
    It seems to me "Track 2.aac" is actually an m4a or mp4 file with the wrong extension.
    Try MediaInfo and tell us what it says.
    users on my IgnoreList: 162 names thus far, but featuring DB83 and manono.
    Quote Quote  
  3. I think that too.

    Mediainfo for Track 1
    Code:
    <?xml version="1.0" encoding="UTF-8"?>
    <MediaInfo
        xmlns="https://mediaarea.net/mediainfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="https://mediaarea.net/mediainfo https://mediaarea.net/mediainfo/mediainfo_2_0.xsd"
        version="2.0">
    <creatingLibrary version="19.07" url="https://mediaarea.net/MediaInfo">MediaInfoLib</creatingLibrary>
    <media ref="/home/prototype/Desktop/music/Track 1.aac">
    <track type="General">
    <AudioCount>1</AudioCount>
    <FileExtension>aac</FileExtension>
    <Format>ADTS</Format>
    <FileSize>5258855</FileSize>
    <OverallBitRate_Mode>VBR</OverallBitRate_Mode>
    <StreamSize>0</StreamSize>
    <File_Modified_Date>UTC 2018-11-01 17:14:29</File_Modified_Date>
    <File_Modified_Date_Local>2018-11-01 18:14:29</File_Modified_Date_Local>
    </track>
    <track type="Audio">
    <Format>AAC</Format>
    <Format_Version>4</Format_Version>
    <Format_AdditionalFeatures>LC</Format_AdditionalFeatures>
    <CodecID>2</CodecID>
    <BitRate_Mode>VBR</BitRate_Mode>
    <Channels>2</Channels>
    <ChannelPositions>Front: L R</ChannelPositions>
    <ChannelLayout>L R</ChannelLayout>
    <SamplesPerFrame>1024</SamplesPerFrame>
    <SamplingRate>44100</SamplingRate>
    <FrameRate>43.066</FrameRate>
    <Compression_Mode>Lossy</Compression_Mode>
    <StreamSize>5258855</StreamSize>
    <StreamSize_Proportion>1.00000</StreamSize_Proportion>
    </track>
    </media>
    </MediaInfo>

    And for Track 2
    Code:
    <?xml version="1.0" encoding="UTF-8"?>
    <MediaInfo
        xmlns="https://mediaarea.net/mediainfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="https://mediaarea.net/mediainfo https://mediaarea.net/mediainfo/mediainfo_2_0.xsd"
        version="2.0">
    <creatingLibrary version="19.07" url="https://mediaarea.net/MediaInfo">MediaInfoLib</creatingLibrary>
    <media ref="/home/prototype/Desktop/music/Track 2.aac">
    <track type="General">
    <AudioCount>1</AudioCount>
    <FileExtension>aac</FileExtension>
    <Format>dash</Format>
    <CodecID>dash</CodecID>
    <CodecID_Compatible>iso6/mp41</CodecID_Compatible>
    <FileSize>7541674</FileSize>
    <Duration>474.802</Duration>
    <OverallBitRate>127071</OverallBitRate>
    <StreamSize>87984</StreamSize>
    <HeaderSize>3020</HeaderSize>
    <DataSize>157378</DataSize>
    <FooterSize>7381276</FooterSize>
    <IsStreamable>Yes</IsStreamable>
    <Encoded_Date>UTC 2018-09-17 20:30:35</Encoded_Date>
    <Tagged_Date>UTC 2018-09-17 20:30:35</Tagged_Date>
    <File_Modified_Date>UTC 2018-10-25 22:04:53</File_Modified_Date>
    <File_Modified_Date_Local>2018-10-26 00:04:53</File_Modified_Date_Local>
    </track>
    <track type="Audio">
    <StreamOrder>0</StreamOrder>
    <ID>1</ID>
    <Format>AAC</Format>
    <Format_AdditionalFeatures>LC</Format_AdditionalFeatures>
    <CodecID>mp4a-40-2</CodecID>
    <Duration>474.802</Duration>
    <BitRate>125588</BitRate>
    <Channels>2</Channels>
    <ChannelPositions>Front: L R</ChannelPositions>
    <ChannelLayout>L R</ChannelLayout>
    <SamplesPerFrame>1024</SamplesPerFrame>
    <SamplingRate>44100</SamplingRate>
    <SamplingCount>20938768</SamplingCount>
    <FrameRate>43.066</FrameRate>
    <FrameCount>20448</FrameCount>
    <Compression_Mode>Lossy</Compression_Mode>
    <StreamSize>7453690</StreamSize>
    <StreamSize_Proportion>0.98833</StreamSize_Proportion>
    <Language>en</Language>
    <Encoded_Date>UTC 2018-09-17 20:30:35</Encoded_Date>
    <Tagged_Date>UTC 2018-09-17 20:30:35</Tagged_Date>
    </track>
    </media>
    </MediaInfo>
    Quote Quote  
  4. Originally Posted by Prototype v1.0 View Post
    I think that too.

    Mediainfo for Track 1
    Code:
    <?xml version="1.0" encoding="UTF-8"?>
    <MediaInfo
        xmlns="https://mediaarea.net/mediainfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="https://mediaarea.net/mediainfo https://mediaarea.net/mediainfo/mediainfo_2_0.xsd"
        version="2.0">
    <creatingLibrary version="19.07" url="https://mediaarea.net/MediaInfo">MediaInfoLib</creatingLibrary>
    <media ref="/home/prototype/Desktop/music/Track 1.aac">
    <track type="General">
    <AudioCount>1</AudioCount>
    <FileExtension>aac</FileExtension>
    <Format>ADTS</Format>
    <FileSize>5258855</FileSize>
    <OverallBitRate_Mode>VBR</OverallBitRate_Mode>
    <StreamSize>0</StreamSize>
    <File_Modified_Date>UTC 2018-11-01 17:14:29</File_Modified_Date>
    <File_Modified_Date_Local>2018-11-01 18:14:29</File_Modified_Date_Local>
    </track>
    <track type="Audio">
    <Format>AAC</Format>
    <Format_Version>4</Format_Version>
    <Format_AdditionalFeatures>LC</Format_AdditionalFeatures>
    <CodecID>2</CodecID>
    <BitRate_Mode>VBR</BitRate_Mode>
    <Channels>2</Channels>
    <ChannelPositions>Front: L R</ChannelPositions>
    <ChannelLayout>L R</ChannelLayout>
    <SamplesPerFrame>1024</SamplesPerFrame>
    <SamplingRate>44100</SamplingRate>
    <FrameRate>43.066</FrameRate>
    <Compression_Mode>Lossy</Compression_Mode>
    <StreamSize>5258855</StreamSize>
    <StreamSize_Proportion>1.00000</StreamSize_Proportion>
    </track>
    </media>
    </MediaInfo>

    And for Track 2
    Code:
    <?xml version="1.0" encoding="UTF-8"?>
    <MediaInfo
        xmlns="https://mediaarea.net/mediainfo"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="https://mediaarea.net/mediainfo https://mediaarea.net/mediainfo/mediainfo_2_0.xsd"
        version="2.0">
    <creatingLibrary version="19.07" url="https://mediaarea.net/MediaInfo">MediaInfoLib</creatingLibrary>
    <media ref="/home/prototype/Desktop/music/Track 2.aac">
    <track type="General">
    <AudioCount>1</AudioCount>
    <FileExtension>aac</FileExtension>
    <Format>dash</Format>
    <CodecID>dash</CodecID>
    <CodecID_Compatible>iso6/mp41</CodecID_Compatible>
    <FileSize>7541674</FileSize>
    <Duration>474.802</Duration>
    <OverallBitRate>127071</OverallBitRate>
    <StreamSize>87984</StreamSize>
    <HeaderSize>3020</HeaderSize>
    <DataSize>157378</DataSize>
    <FooterSize>7381276</FooterSize>
    <IsStreamable>Yes</IsStreamable>
    <Encoded_Date>UTC 2018-09-17 20:30:35</Encoded_Date>
    <Tagged_Date>UTC 2018-09-17 20:30:35</Tagged_Date>
    <File_Modified_Date>UTC 2018-10-25 22:04:53</File_Modified_Date>
    <File_Modified_Date_Local>2018-10-26 00:04:53</File_Modified_Date_Local>
    </track>
    <track type="Audio">
    <StreamOrder>0</StreamOrder>
    <ID>1</ID>
    <Format>AAC</Format>
    <Format_AdditionalFeatures>LC</Format_AdditionalFeatures>
    <CodecID>mp4a-40-2</CodecID>
    <Duration>474.802</Duration>
    <BitRate>125588</BitRate>
    <Channels>2</Channels>
    <ChannelPositions>Front: L R</ChannelPositions>
    <ChannelLayout>L R</ChannelLayout>
    <SamplesPerFrame>1024</SamplesPerFrame>
    <SamplingRate>44100</SamplingRate>
    <SamplingCount>20938768</SamplingCount>
    <FrameRate>43.066</FrameRate>
    <FrameCount>20448</FrameCount>
    <Compression_Mode>Lossy</Compression_Mode>
    <StreamSize>7453690</StreamSize>
    <StreamSize_Proportion>0.98833</StreamSize_Proportion>
    <Language>en</Language>
    <Encoded_Date>UTC 2018-09-17 20:30:35</Encoded_Date>
    <Tagged_Date>UTC 2018-09-17 20:30:35</Tagged_Date>
    </track>
    </media>
    </MediaInfo>
    You're joking right? Have you ever seen mediainfo output posted in the format you have? (please send me a link if you have). Why did you post it like that?
    Quote Quote  
  5. Use text mode in MediaInfo. Not xml.
    Quote Quote  
  6. I choosed xml because it is more detailed than text mode and I assumed that was the best (i.e. most informative) choice.

    But hey, I can always post the text info in aditional:
    Quote Quote  
  7. Here it is:

    Text version for track 1
    Code:
    General
    Complete name                            : /home/prototype/Desktop/music/Track 1.aac
    Format                                   : ADTS
    Format/Info                              : Audio Data Transport Stream
    File size                                : 5.02 MiB
    Overall bit rate mode                    : Variable
    
    Audio
    Format                                   : AAC LC
    Format/Info                              : Advanced Audio Codec Low Complexity
    Format version                           : Version 4
    Codec ID                                 : 2
    Bit rate mode                            : Variable
    Channel(s)                               : 2 channels
    Channel layout                           : L R
    Sampling rate                            : 44.1 kHz
    Frame rate                               : 43.066 FPS (1024 SPF)
    Compression mode                         : Lossy
    Stream size                              : 5.02 MiB (100%)

    Text version for track 2
    Code:
    General
    Complete name                            : /home/prototype/Desktop/music/Track 2.aac
    Format                                   : dash
    Codec ID                                 : dash (iso6/mp41)
    File size                                : 7.19 MiB
    Duration                                 : 7 min 54 s
    Overall bit rate                         : 127 kb/s
    Encoded date                             : UTC 2018-09-17 20:30:35
    Tagged date                              : UTC 2018-09-17 20:30:35
    
    Audio
    ID                                       : 1
    Format                                   : AAC LC
    Format/Info                              : Advanced Audio Codec Low Complexity
    Codec ID                                 : mp4a-40-2
    Duration                                 : 7 min 54 s
    Bit rate                                 : 126 kb/s
    Channel(s)                               : 2 channels
    Channel layout                           : L R
    Sampling rate                            : 44.1 kHz
    Frame rate                               : 43.066 FPS (1024 SPF)
    Compression mode                         : Lossy
    Stream size                              : 7.11 MiB (99%)
    Language                                 : English
    Encoded date                             : UTC 2018-09-17 20:30:35
    Tagged date                              : UTC 2018-09-17 20:30:35
    Quote Quote  



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