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Thread: mkv

  1. #1
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    Default mkv

    I tested some mkv on the kathrein. the tracks are AC3 or DTS ( super )

    I noticed than some mkv has sound, and some any sound.
    I checked the tracks of these mkv with mediainfo --> http://mediainfo.sourceforge.net/en

    the mkv with this parameters " Type of muxing: Header stripping" has NO sound.

    I checked this parameters and bad news ( http://www.matroska.org/technical/specs/index.html )
    ContentCompAlgo --> The compression algorithm used. Algorithms that have been specified so far are:
    0 - zlib,
    1 - bzlib, out
    2 - lzo1x out
    3 - Header Stripping,
    Tracks with ContentCompAlgo = 3 are unusable. This might become a problem soon since mkvmerge just got support for header stripping and apparently it's going to be enabled by default.

    Do you have any solution for the mkv with " Type of muxing: Header stripping" ?

    thanks a lot

    PS :
    This compression method works correctly with the DirectShow Haali splitter, as well as with lavf. From a quick look at matroskaparser.c it appears the stripped headers are placed on the track (tp->CompMethodPrivate) and prepended on the CodecPrivate if applicable; however prepending them onto the actual frames is the responsibility of the using app?
    mkvmerge: enhancement: Header removal compression has been enabled by default for MPEG-4 part 10 (AVC/h.264) video tracks with a NALU size field length of four bytes. The only way for ffms2-based apps to do anything with the new files is to (re)mux them explicitly without compression.

    I test this solution
    You can download VID2EVA from http://vid2eva.lefti.net. This is a freeware video conversion tool that I've put together. After installation you right click on the MKV and select "VID2EVA" then "transcode audio". For this particular file, it won't transcode since the audio is already AC3. But it will remove the header compression.....a new feature to VID2EVA (starting with today's 2010-09-24 release).

    Right-clicking on a folder will scan all MKVs in that folder (and its subfolders). Any MKV with header compression is remuxed to remove it. Other files are not touched.

    You can also right-click on individual MKV files of course
    Last edited by dreanew; 05-10-10 at 10:51.
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