[mythtv-commits] Ticket #5758: ZM using default SHM key resulting in no video stream

[MythTV]

#5758: ZM using default SHM key resulting in no video stream
---------------------------------+------------------------------------------
 Reporter:  noisymime at gmail.com  |        Owner:  paulh  
     Type:  defect               |       Status:  new    
 Priority:  minor                |    Milestone:  unknown
Component:  mythzoneminder       |      Version:  head   
 Severity:  medium               |   Resolution:         
  Mlocked:  0                    |  
---------------------------------+------------------------------------------
Description changed by paulh:

Old description:

> System: Mythbuntu 8.10 Alpha 6
> Zoneminder: 1.23.3
> mythzmserver: head
>
> Under certain circumstances (Possibly in all cases), Zoneminder 1.23.3
> appears to be using the default value field for setting ZM_SHM_KEY rather
> than the normal one. This occurs on a vanilla install of mythbuntu 8.10.
> This results in an incorrect shared memory key being used
>
> mythzmserver output:
> loading zm config from /etc/zm/zm.conf
> ZM is version '1.23.3'
> Listening on port: 6548
> Using server protocol version '6'
> getZMSetting: ZM_SHM_KEY Result: 0x7a6d2000
> Shared memory key is: 0x7a6d2000
> getZMSetting: ZM_EVENT_IMAGE_DIGITS Result: 3
> Event file format is: %03d-capture.jpg
> Analyse file format is: %03d-analyse.jpg
> Got 2 monitors
> Failed to shmget for monitor: 1
> shmget args: 2053971969
> ENOENT - no segment exists for the given key
> Failed to shmget for monitor: 3
> shmget args: 2053971971
> ENOENT - no segment exists for the given key
> new connection from 127.0.0.1 on socket 5
> Processing: 'HELLO'
> Processing: 'GET_MONITOR_LIST'
> Got 2 monitors
> id:      1
> name:    IP-Cam1
> width:   320
> height:  240
> palette: 4
> -------------------
> id:      3
> name:    New
> width:   320
> height:  240
> palette: 4
> -------------------
> Processing: 'GET_LIVE_FRAME'
> Kicking database connection
> Getting live frame from monitor: 1
> Processing: 'GET_LIVE_FRAME'
> Getting live frame from monitor: 1
> Processing: 'GET_LIVE_FRAME'
> Getting live frame from monitor: 1
> Processing: 'GET_LIVE_FRAME'
> Getting live frame from monitor: 1
> Processing: 'GET_LIVE_FRAME'
> Getting live frame from monitor: 1
>
> When this occurs there is only a black box shown for a live feed.
>
> I have patched zmserver.cpp and zmserver.h to try the default key value
> if the main one fails and this works on my system (ie I get a live video
> stream).

New description:

 System: Mythbuntu 8.10 Alpha 6
 Zoneminder: 1.23.3
 mythzmserver: head

 Under certain circumstances (Possibly in all cases), Zoneminder 1.23.3
 appears to be using the default value field for setting ZM_SHM_KEY rather
 than the normal one. This occurs on a vanilla install of mythbuntu 8.10.
 This results in an incorrect shared memory key being used
 {{{
 mythzmserver output:
 loading zm config from /etc/zm/zm.conf
 ZM is version '1.23.3'
 Listening on port: 6548
 Using server protocol version '6'
 getZMSetting: ZM_SHM_KEY Result: 0x7a6d2000
 Shared memory key is: 0x7a6d2000
 getZMSetting: ZM_EVENT_IMAGE_DIGITS Result: 3
 Event file format is: %03d-capture.jpg
 Analyse file format is: %03d-analyse.jpg
 Got 2 monitors
 Failed to shmget for monitor: 1
 shmget args: 2053971969
 ENOENT - no segment exists for the given key
 Failed to shmget for monitor: 3
 shmget args: 2053971971
 ENOENT - no segment exists for the given key
 new connection from 127.0.0.1 on socket 5
 Processing: 'HELLO'
 Processing: 'GET_MONITOR_LIST'
 Got 2 monitors
 id:      1
 name:    IP-Cam1
 width:   320
 height:  240
 palette: 4
 -------------------
 id:      3
 name:    New
 width:   320
 height:  240
 palette: 4
 -------------------
 Processing: 'GET_LIVE_FRAME'
 Kicking database connection
 Getting live frame from monitor: 1
 Processing: 'GET_LIVE_FRAME'
 Getting live frame from monitor: 1
 Processing: 'GET_LIVE_FRAME'
 Getting live frame from monitor: 1
 Processing: 'GET_LIVE_FRAME'
 Getting live frame from monitor: 1
 Processing: 'GET_LIVE_FRAME'
 Getting live frame from monitor: 1
 }}}
 When this occurs there is only a black box shown for a live feed.

 I have patched zmserver.cpp and zmserver.h to try the default key value if
 the main one fails and this works on my system (ie I get a live video
 stream).

--

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Ticket URL: <http://svn.mythtv.org/trac/ticket/5758#comment:1>
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