Need help with an mkv file

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Re: Need help with an mkv file

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Cannot Extract Tracks (Garbled Output)

Hi everyone. I'm new to Matroska, but it looks like a very interesting
project! 

I have a few clips here that I cannot seem to extract using
mkvextract. Doing a `mkvmerge -i` on the file shows the following
info:

Track ID 1: video (V_MPEG4/ISO/AVC)
Track ID 2: audio (A_AC3)

However, when I try to extract it, the output is all garbled blocks of
colors and mplayer gives these errors: 

AC EOB marker is absent pos=66
AC EOB marker is absent pos=66
AC EOB marker is absent pos=92
[etc]

I tried a few variations, but the command I've tried for both clips so
far is this. It goes fine without any errors, but the output of both
the avi and ac3 is all garbled.

mkvextract tracks file.mkv 1:test.avi 2:test.ac3

Sorry if this is a common question, but I did search the FAQ and lists
but didn't come up with anything.

FreeBSD 6.1-STABLE 
libmatroska-0.8.0

Thanks in advance!

-Mark

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Re: Cannot Extract Tracks (Garbled Output)

On Jun 8, 2006, at 16.58, Mark Kane wrote:

> Hi everyone. I'm new to Matroska, but it looks like a very interesting
> project!
>
> I have a few clips here that I cannot seem to extract using
> mkvextract. Doing a `mkvmerge -i` on the file shows the following
> info:
>
> Track ID 1: video (V_MPEG4/ISO/AVC)
> Track ID 2: audio (A_AC3)
>
> However, when I try to extract it, the output is all garbled blocks of
> colors and mplayer gives these errors:
>
> AC EOB marker is absent pos=66
> AC EOB marker is absent pos=66
> AC EOB marker is absent pos=92
> [etc]

Sounds like MPlayer can't recognize the file, and deciding it's a raw  
DV stream (happens quite commonly with damaged AVI/MPEG headers). I  
have to ask, though: what version are you using? Some MPlayer  
versions have had some bad demuxers. You might want to use the latest  
SVN for the best results. Anyway, sounds like a busted AVI header.  
Have you tried forcing the use of a decoder, such as
-vc ffmpegh264
to force the use of the FFMPEG H.264 decoder, instead of MPlayer  
deciding on the raw DV decoder. Just use -ac help OR -vc help to  
determine what decoders are available.

>
> I tried a few variations, but the command I've tried for both clips so
> far is this. It goes fine without any errors, but the output of both
> the avi and ac3 is all garbled.
>
> mkvextract tracks file.mkv 1:test.avi 2:test.ac3
>
> Sorry if this is a common question, but I did search the FAQ and lists
> but didn't come up with anything.

Can you send us the output of mkvinfo? This should help us determine  
if it's a damaged file, or a problem with your software. Also, have  
you tried remuxing the file? IE: mkvmerge (input).mkv -o  
(output).mkv? Perhaps that might help fix the file, if there's  
something wrong with it.

Re: Cannot Extract Tracks (Garbled Output)

On Fri, Jun 09, 2006, at 02:03:35 -0500, Ivan Kowalenko wrote:
> Sounds like MPlayer can't recognize the file, and deciding it's a
> raw DV stream (happens quite commonly with damaged AVI/MPEG headers).
> I have to ask, though: what version are you using? Some MPlayer  
> versions have had some bad demuxers. You might want to use the
> latest SVN for the best results. Anyway, sounds like a busted AVI
> header. Have you tried forcing the use of a decoder, such as
> - -vc ffmpegh264
> to force the use of the FFMPEG H.264 decoder, instead of MPlayer  
> deciding on the raw DV decoder. Just use -ac help OR -vc help to  
> determine what decoders are available.

Hi, thanks for the reply. 

MPlayer version is 0.99.7_14. I've also tried playing the extracted .avi
in VLC and Xine, neither will play it. VLC shows the seek bar going from
left to right for about 2 seconds, then stops, but no video shows (it
doesn't show an audio/video track either). Xine says it can't find a
demuxer plugin. With the "More" button, it says:

xine: found demuxer plugin: Elementary MPEG stream demux plugin

MPlayer and Xine both play the original Matroska files fine, however
VLC won't show video output on the original .mkv. It shows the seek bar
moving throughout the entire clip duration, and shows "avc1" as the
codec, plays the audio, but no video output.

I tried the mplayer suggestion of the forcing video codec, but it
doesn't play anything this time. Here is what it says:

Playing file.avi.
AVI: Missing video stream!? Contact the author, it may be a bug :(
RAWDV file format detected.
VIDEO:  [DVSD]  720x480  24bpp  29.970 fps    0.0 kbps ( 0.0 kbyte/s)

> Can you send us the output of mkvinfo? This should help us determine  
> if it's a damaged file, or a problem with your software. Also, have  
> you tried remuxing the file? IE: mkvmerge (input).mkv -o  
> (output).mkv? Perhaps that might help fix the file, if there's  
> something wrong with it.

Sure, the output of mkvinfo is attached. I tried remuxing but it's the
same result. I think the original Matroska files are fine, just
something in the process of extracting the tracks.

Thanks again!

-Mark

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Re: Cannot Extract Tracks (Garbled Output)

Hey,

On Thursday 08 June 2006 23:58, Mark Kane wrote:

> Track ID 1: video (V_MPEG4/ISO/AVC)

> mkvextract tracks file.mkv 1:test.avi 2:test.ac3

mkvextract writes AVC to raw AVC elementary streams, not to AVIs (it
cannot and will never be able to do that). You should use mp4box which
can import AVC ES into MP4 files. Those can be played by mplayer.

Regards,
Mosu

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Re: Cannot Extract Tracks (Garbled Output)

On Jun 9, 2006, at 02.49, Moritz Bunkus wrote:

> Hey,
>
> On Thursday 08 June 2006 23:58, Mark Kane wrote:
>
>> Track ID 1: video (V_MPEG4/ISO/AVC)
>
>> mkvextract tracks file.mkv 1:test.avi 2:test.ac3
>
> mkvextract writes AVC to raw AVC elementary streams, not to AVIs (it
> cannot and will never be able to do that). You should use mp4box which
> can import AVC ES into MP4 files. Those can be played by mplayer.

MPlayer should be able to play raw H.264 streams. It can output them.  
The catch is that since a raw stream doesn't have a header, MPlayer  
doesn't know what it is playing, so the user must invoke the -vc  
option to tell MPlayer what to use.

Re: Cannot Extract Tracks (Garbled Output)

On Jun 9, 2006, at 11.00, Mark Kane wrote:

> On Fri, Jun 09, 2006, at 02:03:35 -0500, Ivan Kowalenko wrote:
>> Sounds like MPlayer can't recognize the file, and deciding it's a
>> raw DV stream (happens quite commonly with damaged AVI/MPEG headers).
>> I have to ask, though: what version are you using? Some MPlayer
>> versions have had some bad demuxers. You might want to use the
>> latest SVN for the best results. Anyway, sounds like a busted AVI
>> header. Have you tried forcing the use of a decoder, such as
>> - -vc ffmpegh264
>> to force the use of the FFMPEG H.264 decoder, instead of MPlayer
>> deciding on the raw DV decoder. Just use -ac help OR -vc help to
>> determine what decoders are available.
>
> Hi, thanks for the reply.
>
> MPlayer version is 0.99.7_14. I've also tried playing the  
> extracted .avi
> in VLC and Xine, neither will play it. VLC shows the seek bar going  
> from
> left to right for about 2 seconds, then stops, but no video shows (it
> doesn't show an audio/video track either). Xine says it can't find a
> demuxer plugin. With the "More" button, it says:

Well, your MPlayer version is waaaaay out of date. Upgrading to SVN  
is advised.

> xine: found demuxer plugin: Elementary MPEG stream demux plugin
>
> MPlayer and Xine both play the original Matroska files fine, however
> VLC won't show video output on the original .mkv. It shows the seek  
> bar
> moving throughout the entire clip duration, and shows "avc1" as the
> codec, plays the audio, but no video output.
>
> I tried the mplayer suggestion of the forcing video codec, but it
> doesn't play anything this time. Here is what it says:
>
> Playing file.avi.
> AVI: Missing video stream!? Contact the author, it may be a bug :(
> RAWDV file format detected.
> VIDEO:  [DVSD]  720x480  24bpp  29.970 fps    0.0 kbps ( 0.0 kbyte/s)

hmm. Seems MPlayer is expecting a container. See below for notes.

>
>> Can you send us the output of mkvinfo? This should help us determine
>> if it's a damaged file, or a problem with your software. Also, have
>> you tried remuxing the file? IE: mkvmerge (input).mkv -o
>> (output).mkv? Perhaps that might help fix the file, if there's
>> something wrong with it.
>
> Sure, the output of mkvinfo is attached. I tried remuxing but it's the
> same result. I think the original Matroska files are fine, just
> something in the process of extracting the tracks.

The data is missing. It seems the mailing list system must have  
stripped out the attachment. But, in this case, I think Moritz Bunkus  
is on the right track, about the output being a straight H.264  
stream. You might have to remux the output file as an MKV file in  
order to use it.

Demuxing from Matroska, Remuxing to Other Format

Hello.

I have several MKV files that I wish to transcode. However, I have an  
odd situation where the transcoder doesn't seem to like the MKV files  
as they are in source. If I remux them, either to another Matroska  
file, AVI file, etc., the transcoder has no problems. This probably  
has something to do with the way I archived the files or something  
like that.

My goal is to remux the files so that I can transcode them. Part of  
the problem is, though, whenever I remux the file (even using  
MKVMerge), I get busted keyframes and loss of audio sync. If I use  
MEncoder to remux the video to an AVI file (mencoder -ovc copy -oac  
copy), I get the same results. If I demux the video using MKVExtract,  
and remux the file with MEncoder, I don't get broken keyframes, but I  
do get out of sync audio.

Padding the audio doesn't seem to be the solution here, since the  
audio gets *progressively* out of sync, that is the further into the  
video you go, the more out of sync it gets.

I'm running a Mac OS X (10.4.6) system, and have no fear when it  
comes to monkeying around with the UNIX sub-system. Any recommendations?

Re: Cannot Extract Tracks (Garbled Output)

On Fri, Jun 09, 2006, at 23:57:00 -0500, Ivan Kowalenko wrote:
> Well, your MPlayer version is waaaaay out of date. Upgrading to SVN  
> is advised.

I'm using the latest from the FreeBSD ports system. Reading the changes
on the port, it's said to be using 1.0pre7, which sounds fairly close
to the "1.0pre7try2" that's on the MPlayer site. I understand SVN is
current and the most up to date, but I am using the newest version that
has been ported to my OS.

> The data is missing. It seems the mailing list system must have  
> stripped out the attachment. But, in this case, I think Moritz
> Bunkus is on the right track, about the output being a straight
> H.264 stream. You might have to remux the output file as an MKV file
> in order to use it.

I'll just paste the text onto the end of this message. My end goal is
to load the audio+video into Avidemux2 and convert it further....but
Avidemux doesn't load the extracted video either. I originally asked on
the Avidemux forum, and they said I needed Matroska to demux the file,
and then I could load it into Avidemux. If no players can play the
extracted tracks though, then I can't expect Avidemux to be able to
load them either. 

Again, sorry if this is a "noobish" type question/problem, but I'm just
thinking there is something wrong with the extracting, or how I'm doing
it.

Thanks again.

-Mark

========================================

+ EBML head
|+ Doc type: matroska
|+ Doc type version: 1
|+ Doc type read version: 1
+ Segment, size 16877313
|+ Seek head (subentries will be skipped)
|+ EbmlVoid (size: 4027)
|+ Segment information
| + Timecode scale: 1000000
| + Muxing application: libebml v0.7.6 + libmatroska v0.8.0
| + Writing application: mkvmerge v1.6.5 ('Watcher Of The Skies') built
on Dec  7 2005 18:53:53 | + Duration: 64.416s (00:01:04.416000000)
| + Date: Wed May  3 16:22:17 2006 UTC
| + Segment UID: 0xad 0x73 0x00 0x2e 0xd5 0x0d 0xd9 0x5b 0x98 0x29 0xd1
0x9e 0x20 0x42 0x0b 0x47 |+ Segment tracks
| + A track
|  + Track number: 1
|  + Track UID: 1
|  + Track type: video
|  + Enabled: 1
|  + Default flag: 1
|  + Forced flag: 0
|  + Lacing flag: 0
|  + MinCache: 1
|  + Timecode scale: 1.000000
|  + Max BlockAddition ID: 0
|  + Codec ID: V_MPEG4/ISO/AVC
|  + Codec decode all: 1
|  + CodecPrivate, length 38
|  + Default duration: 41.708ms (23.976 fps for a video track)
|  + Language: eng
|  + Video track
|   + Pixel width: 1280
|   + Pixel height: 720
|   + Interlaced: 0
|   + Display width: 16
|   + Display height: 9
| + A track
|  + Track number: 2
|  + Track UID: 2589792693
|  + Track type: audio
|  + Enabled: 1
|  + Default flag: 1
|  + Forced flag: 0
|  + Lacing flag: 1
|  + MinCache: 0
|  + Timecode scale: 1.000000
|  + Max BlockAddition ID: 0
|  + Codec ID: A_AC3
|  + Codec decode all: 1
|  + Default duration: 32.000ms (31.250 fps for a video track)
|  + Language: eng
|  + Audio track
|   + Sampling frequency: 48000.000000
|   + Channels: 6
|+ EbmlVoid (size: 1024)
|+ Cluster

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