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

Steve Lhomme slhomme at matroska.org
Sat Feb 4 12:23:32 CET 2012


Le 02/02/2012 21:02, David R Robison a écrit :
> My bad. We use two different MJPEG cameras. This camera was recorded at
> 1600x1200 resolution. However, it still does not explain why I cannot
> replay it. Any ideas? David

No idea, it doesn't look like a container problem though.

> On 1/29/2012 12:32 PM, Steve Lhomme wrote:
>>
>> 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
>> <mailto: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 <http://ivankowalenko.com/>
>>     e: ivan at ivankowalenko.com <mailto:ivan at ivankowalenko.com>
>>
>>
>>
>>
>>     On Wed, Jan 25, 2012 at 1:05 PM, David R Robison
>>     <drrobison at openroadsconsulting.com
>>     <mailto: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 <mailto:ivan at ivankowalenko.com>
>>>         p: 856-270-6049 <tel:856-270-6049>
>>>
>>>         On Jan 25, 2012 11:04 AM, "David R Robison"
>>>         <drrobison at openroadsconsulting.com
>>>         <mailto: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  <tel:%28757%29%20546-3401>
>>         e-mail:drrobison at openroadsconsulting.com  <mailto: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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>>
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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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