[Matroska-users] Problem playing recorded MJPEG with high resolution

Steve Lhomme slhomme at matroska.org
Sun Jan 29 18:32:11 CET 2012


You should report the bug to vlc. They are about to make a big release and
will surely fix it
On Jan 29, 2012 6:30 PM, "Ivan Kowalenko" <ivan.kowalenko at gmail.com> wrote:

> I'm not sure most graphics cards are designed for accelerating MJPEG
> decoding, since mostly what I've seen is focused on H.264 decoding (to
> assist with commercially distributed HD material, such as iTunes purchases
> and BluRay playback).
>
> I can confirm that VLC will immediately crash upon opening the file in
> version 1.1.12 in Mac OS X 10.6.8 (32-bit mode). I also ran a test with
> mplayer to see if I could get some more detailed information, and as luck
> would have it, it did!
>
> Ayanami:Downloads kichigai$ mplayer Cam564-20120124-124827.mkv
>> MPlayer SVN-r32528-4.2.1 (C) 2000-2010 MPlayer Team
>> Can't init Apple Remote.
>>
>> Playing Cam564-20120124-124827.mkv.
>> libavformat file format detected.
>> [matroska,webm @ 0x10180ee00] Unknown entry 0xFF
>> [matroska,webm @ 0x10180ee00] Unknown entry 0x656E
>> [matroska,webm @ 0x10180ee00] Unknown entry 0x4273
>> [matroska,webm @ 0x10180ee00] Unknown entry 0x67AD
>> [matroska,webm @ 0x10180ee00] Read error at pos. 1550586 (0x17a8fa)
>> [matroska,webm @ 0x10180ee00] Invalid stream 1 or size 3
>> [matroska,webm @ 0x10180ee00] Estimating duration from bitrate, this may
>> be inaccurate
>> [lavf] stream 0: video (mjpeg), -vid 0, video
>> VIDEO:  [MJPG]  1600x1200  0bpp  10.000 fps    0.0 kbps ( 0.0 kbyte/s)
>> ==========================================================================
>> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
>> [mjpeg @ 0x100a1b740]mjpeg: using external huffman table
>> Selected video codec: [ffmjpeg] vfm: ffmpeg (FFmpeg MJPEG)
>> ==========================================================================
>> Audio: no sound
>> Starting playback...
>> Could not find matching colorspace - retrying with -vf scale...
>> Opening video filter: [scale]
>> Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
>> [swscaler @ 0x100a23920]using unscaled yuv422p -> yuyv422 special
>> converter
>> VO: [corevideo] 1600x1200 => 1600x1200 Packed YUY2
>> [ASPECT] Warning: No suitable new res found!
>> V:   0.0   0/  0 ??% ??% ??,?% 0 0
>> [matroska,webm @ 0x100a18e60]Read error at pos. 1550587 (0x17a8fb)
>> V:   0.0   0/  0 ??% ??% ??,?% 0 0
>>
>>
>> Exiting... (End of file)
>> Ayanami:Downloads kichigai$
>>
>  Notice how to says it's attempting to decode the video at a resolution
> of 1600×1200. I suspect that this is where your problem lies, and that
> somewhere between your source video and mkvmerge is a mismatch in
> detected resolutions. Indeed, this is what mkvinfo had to say:
>
>> + EBML head
>> |+ Doc type: matroska
>> |+ Doc type version: 2
>> |+ Doc type read version: 2
>> + Segment, size 10146941
>> |+ Seek head (subentries will be skipped)
>> |+ Segment information
>> | + Timecode scale: 1000000
>> | + Duration: 7.230s (00:00:07.230)
>> | + Date: Tue Jan 24 18:48:34 2012 UTC
>> | + Muxing application: dsj_MKVSink (dsj 0_8_64)
>> | + Writing application: dsj_MKVSink (dsj 0_8_64)
>> |+ Segment tracks
>> | + A track
>> |  + Track number: 1
>> |  + Track type: video
>> |  + Track UID: 1185106944
>> |  + Default duration: 100.000ms (10.000 fps for a video track)
>> |  + Video track
>> |   + Pixel width: 1600
>> |   + Pixel height: 1200
>> |   + Frame rate: 10
>> |  + Codec ID: V_MS/VFW/FOURCC
>> |  + CodecPrivate, length 46 (FourCC: MJPG, 0x47504a4d)
>> |  + Name: video
>> |+ Cluster
>>
> Try specifying the video resolution in your mkvmerge command and see if
> that fixes the problem. --display-dimensions might fix the problem, but
> no promises if it's interpreting the video data to be encoded at the wrong
> resolution. I would also check your source file's container. Perhaps you
> can tweak that to pass the right information.
>
> ----------------------------------------------------
> Ivan Kowalenko
> w: http://ivankowalenko.com
> e: ivan at ivankowalenko.com
>
>
>
>
> On Wed, Jan 25, 2012 at 1:05 PM, David R Robison <
> drrobison at openroadsconsulting.com> wrote:
>
>>  We have a nVidia graphics card. I'm sure our hardware is sufficient as
>> we do a lot of software video decoding. vlc Plays the first frame then
>> crashes. David
>>
>>
>> On 1/25/2012 2:01 PM, Ivan Kowalenko wrote:
>>
>> Try VLC. It may behave a little better. What are you running for
>> hardware? It could just be overwhelming.
>>
>> ----------------------------------------------------
>> Ivan Kowalenko
>> w: http://ivankowalenko.com
>> e: ivan at ivankowalenko.com
>> p: 856-270-6049
>> On Jan 25, 2012 11:04 AM, "David R Robison" <
>> drrobison at openroadsconsulting.com> wrote:
>>
>>
>> _______________________________________________
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>>
>> --
>>
>> David R Robison
>> Open Roads Consulting, Inc.
>> 103 Watson Road, Chesapeake, VA 23320
>> phone: (757) 546-3401
>> e-mail: drrobison at openroadsconsulting.com
>> web: http://openroadsconsulting.com
>> blog: http://therobe.blogspot.com
>> book: http://www.xulonpress.com/bookstore/bookdetail.php?PB_ISBN=9781597816526
>>
>>
>>
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