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Thema: Matroska parsen

  1. #1
    Haudegen
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    Standard Matroska parsen

    Hallo alle

    Ich würde gerne Matroska Dateien selber parsen wollen, allerdings fehlt mir da der Ansatz.
    Kennt sich einer von euch damit aus und würde mir helfen?

    hubble

  2. #2
    TBD Avatar von Groucho2004
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    Standard AW: Matroska parsen

    Zitat Zitat von hubblec4 Beitrag anzeigen
    Ich würde gerne Matroska Dateien selber parsen wollen, allerdings fehlt mir da der Ansatz.
    Ist es wirklich so kompliziert Google zu benutzen?
    Matroska Technical Info

  3. #3
    Haudegen
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    Standard AW: Matroska parsen

    Ist es IMMer nötig die Leute auf Google zu verweisen???

    Ich denke du hast meine Signatur gesehen...Ich kenne mich schon recht gut aus was Matroska angeht, aber parsen ist was anderes als technical Infos zu lesen oder irre ich mich da jetzt völlig?

  4. #4
    TBD Avatar von Groucho2004
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    Standard AW: Matroska parsen

    Zitat Zitat von hubblec4 Beitrag anzeigen
    Ich kenne mich schon recht gut aus was Matroska angeht, aber parsen ist was anderes als technical Infos zu lesen oder irre ich mich da jetzt völlig?
    Alle Infos die du brauchst sind da. Vielleicht solltest du dir den Source Code von Bunkus' mkvtoolnix/mkvinfo ansehen.
    Geändert von Groucho2004 (17. February 2017 um 16:36 Uhr)

  5. #5
    Haudegen
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    Standard AW: Matroska parsen

    Ja ich weis das dort alle Infos zu finden sind, nur leider versteh ich nicht alles was da steht.

    Bisher habe ich nur ifo und mpls Dateien geparst. Dort war es irgendwie leichter verständlicher.

    Bei ifo zum Beispiel gibts ein TableStartByte und innerhalb dieses Tables gibt es OffSets, wodurch man zur gewünschten BytePosition in der Datei kommt.
    Ähnlich ist es bei mpls Dateien.

    Im anhang mal eine winzige mkv Datei mit ein paar Kapiteln
    und hier die Bytes
    Code:
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    Basierend auf den Specs müsste ich mich hier durch arbeiten und das als "Code" umsetzen.

    Der Teil "Elements semantic" ist mir soweit klar, da es die Struktur ist (verschachteltes System).
    Den oberen Teil "EBML principle", insbesondere "Element ID coded with an UTF-8 like system " und "Data size, in octets, is also coded with an UTF-8 like system" sind mir nicht so recht klar.


    Bei der Beispiel Datei befinden sich vor dem "ersten" Top-Level Element (EBML mit der ID: 1A 45 DF A3) noch Daten, was ja anscheinend kein Problem ist(Datei spielt ordentlich ab).
    Das zweite Element (EBMLVersion mit der ID: 42 86) befindet sich, nach nur einem Byte, direkt dahinter.
    Was bedeutet also das eine Byte(A3) zwischen den Elementen?

    Wie und mit welchen Bytes fange ich an und wie arbeite ich mich dann durch die Daten-Struktur?


    Ich versuche abundzu den source code von Mosu zu lesen, leider kenne ich mit C-undCo nicht aus, ebenso wäre es sicher von Vorteil den Code sich mal selber zu kompileren und zu testen.
    Aber soweit ich verstehe bräuchte man da VisualStudio (oder so). Das habe ich nicht und es kostet mir auch zu viel.
    Angehängte Dateien Angehängte Dateien
    Geändert von hubblec4 (17. February 2017 um 18:46 Uhr)

  6. #6
    Daydreamer Avatar von Endoro
    Registriert seit
    11. August 2012
    Ort
    Atlantis & Avalon
    Beiträge
    512

    Standard AW: Matroska parsen

    Warum nicht MKVInfo oder ffmpeg zum Parsen einsetzen?
    

  7. #7
    Haudegen
    Registriert seit
    11. April 2007
    Beiträge
    649

    Standard AW: Matroska parsen

    Zitat Zitat von Endoro Beitrag anzeigen
    Warum nicht MKVInfo oder ffmpeg zum Parsen einsetzen?
    Ganz einfach:
    Die parsen nicht so wie man es selber will.
    Ich würde gerne auf externe Software verzichten.
    Ich liebe Herausforderungen.

    Werde mir das aber mal für ffmpeg vielleicht anschauen.

  8. #8
    Daydreamer Avatar von Endoro
    Registriert seit
    11. August 2012
    Ort
    Atlantis & Avalon
    Beiträge
    512

    Standard AW: Matroska parsen

    Zitat Zitat von hubblec4 Beitrag anzeigen
    Ich liebe Herausforderungen.
    Es könnte in Arbeit ausarten ...
    

  9. #9
    Erklär-Bär Avatar von LigH
    Registriert seit
    19. April 2003
    Ort
    Gardelegen
    Alter
    41
    Beiträge
    42.078

    Standard AW: Matroska parsen

    Ich kann mich noch an solche Herausforderungen beim Parsen von AC3 erinnern: Da gab es Bitfelder mit unterschiedlicher Bedeutung und Länge, je nach dem wie ein paar vorherige Bits besetzt waren.

    Encodierung "wie UTF-8" würde ich so verstehen, dass die meisten Daten 8 bit Länge haben, aber bestimmte Bytes dienen als Einleitung für Daten mit 16 oder gar 24 bit Länge. Vielleicht findest du auch irgendwo nochmal die Beschreibung, wie das Grafikformat PCX nur bei Bedarf Lauflängencodierung (RLE) durchführt, das war ein ähnlicher Ansatz.

    Auf gute Zusammenarbeit:

    REGELN befolgen | SUCHE benutzen | FAQ lesen | STICKIES beachten




  10. #10
    Haudegen
    Registriert seit
    11. April 2007
    Beiträge
    649

    Standard AW: Matroska parsen

    Zitat Zitat von Endoro Beitrag anzeigen
    Es könnte in Arbeit ausarten ...
    Das tut es doch immer.

    Ich habe mir mal ffmpeg runtergeladen, und wow, eine 39mb große datei die dann eine winzige aufgabe erfüllen soll. Das finde ich nicht so dolle.


    Naja vielleicht hat ja der ein oder andere Zeit und Lust hier mit zu denken.

    Bei meiner Beispiel Datei scheint beim kopieren der Bytes was schief gegangen zu sein.

    So wie es in den Specs steht beginnt eine Matroska Datei immer mit diesen 4 Byte [1A45DFA3]

    Code:
    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    Um eine EBML Element ID auszulesen muss man deren länge ermitteln.
    Dies geschieht mit dem ersten Byte [1A].
    [1A] als Binär sieht dann so aus [0001 1010]
    Die ersten drei "0"en werden gezählt und mann muss noch plus 1 addieren: man erhält 4.
    (Die grüne 1 ist als "Stop"marke zu betrachten, hier enden die "0"en)
    Die EBML ID ist also 4 Bytes lang was genau passt für das Element "EBML".

    Nach der Element-ID folgt die Datengröße
    Code:
    Element IDs (also called EBML IDs) are outlined as follows, beginning with the ID itself, followed by the Data Size, and then the non-interpreted Binary itself:
    Wie viele Bytes das dann genau sind kann ich aus dem obrigen englishen satz nicht genau ableiten.

    Für die Beispiel Datei wäre es ja nur ein Byte [A3] denn die nächsten beiden [42][86] gehören ja schon wieder zum nächsten EBML Element(EBMLVersion).

    [A3] als Binär sieht es dann so aus [1010 0011] Es gibt keine "führenden "0"en somit erhält man 1 als Länge.
    Welches 1 Byte müsste ich nun lesen, das [A3] selber?

    Hier hänge ich noch etwas fest.
    Geändert von hubblec4 (21. February 2017 um 18:46 Uhr)

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