[mythtv] GetPreviewImage returns 404 not found

[Gordon McLellan]

Mike,

I'm still getting the 404 error.  I double checked doing it manually,
and put in the missing "Myth" in the url,  I also deleted
/mnt/video/*png and /var/www/html/mythweb/data/cache/*png.  The png
files in /mnt/video get recreated and are proper png files, despite
the 404 errors in the log, but the png's in the mythweb cache are
still 0 byte.   I seem to think this is a mythweb problem and not a
mythtv problem.  However, when I search for this problem, the only
solution offered is "make sure upnp is turned on".   I don't see
anywhere I can turn upnp on, just a command line option to turn it off
- is that correct?

Running getpreviewimage on a recording from this morning:

[root at mythserver ~]# wget
'http://localhost:6544/Myth/GetPreviewImage?ChanId=2130&StartTime=2008-05-05T09:00:00&Height=0&Width=100&SecsIn=64'
-O test.png
--09:48:48--  http://localhost:6544/Myth/GetPreviewImage?ChanId=2130&StartTime=2008-05-05T09:00:00&Height=0&Width=100&SecsIn=64
Resolving localhost... 127.0.0.1
Connecting to localhost|127.0.0.1|:6544... connected.
HTTP request sent, awaiting response... 404 Not Found
09:48:48 ERROR 404: Not Found.

2008-05-05 09:48:48.298 MythXML::ProcessRequest: GetPreviewImage : GET
/Myth/GetPreviewImage?ChanId=2130&StartTime=2008-05-05T09:00:00&Height=0&Width=100&SecsIn=64
HTTP/1.0

2008-05-05 09:48:48.300 HTTPRequest::SendResponse(xml/html) () :404
Not Found -> 127.0.0.1: 2

Gordon



On Fri, May 2, 2008 at 11:22 AM, Michael T. Dean
<mtdean at thirdcontact.com> wrote:
> On 05/02/2008 09:57 AM, Gordon McLellan wrote:
>  > I'm trying to troubleshoot a thumbnail generation problem, and have
>  > been running the backend with different verbosities looking for clues.
>  >
>  > I've stumbled across my best lead yet ... a http 404 response is sent
>  > whenever mythweb calls /Myth/GetPreviewImage
>  >
>
>  Perhaps your PHP is misconfigured and it's a DST issue.  Try setting the
>  timezone in /etc/php.ini .
>
>
>  > logs:
>  >
>  > 2008-05-02 09:38:35.733 MythXML::ProcessRequest: GetPreviewImage : GET
>  > /Myth/GetPreviewImage?ChanId=1059&StartTime=2008-05-02T09:00:00&Height=260&Width=320&SecsIn=64
>  > HTTP/1.0
>  >
>
>  Notice the URI.  /Myth/GetPreviewImage...
>
>
>  > I have tried manually calling GetPreviewImage, but I cannot find the
>  > right syntax, or perhaps, the right port number.  I thought it was
>  > 6544, but that does not result in the same error in the logs:
>  >
>  > # wget 'http://localhost:6544/getPreviewImage?ChanId=1059&StartTime=2008-05-02T09:00:00&Height=260&Width=320&SecsIn=64'
>  > -O test.png
>  >
>
>  Notice the missing /Myth...

ok, big mistake there ... I reran the command with a url matching a
known available recording ... a proper PNG was created in /mnt/video
(the myth storage directory), and 0 byte file was created in
/var/www/html/mythweb/data/cache




>
>
>  > and in the log, perhaps this is a cached response?
>  >
>  > 2008-05-02 09:46:40.759 Preview: Grabbed preview
>  > '/mnt/video/1059_20080502093800.mpg' 320x480 at 64s
>  >
>
>  That's a different recording.  It started at 09:38 versus 09:00.
>
>  Is that the only recording missing a preview?  Was it a show that
>  started at 09:00, but you started recording at 09:38?  MythWeb is using
>  the proper time (recstartts) so that shouldn't be the issue.
>
>
>  > All other aspects of myth seem to be working well... it's just this
>  > nagging problem of no thumbnails in mythweb.
>  >
>  > I have a master backend with no tuners, and a combination
>  > slave/frontend with a pvr-500 in it.  The two seem to be talking
>  > properly.  Both servers share a exported network path for storage of
>  > the video and preview images.  Both systems have the full mythtv suite
>  > installed.
>  >
>  > Any thoughts?
>  >
>
>  Try to remove all the png images from your MythWeb data/cache directory
>  and all the png images from your recordings directory(ies).  Be patient
>  when requesting the MythWeb Recorded Programs page as it will take a
>  while (could be tens of minutes if you have hundreds of recordings) to
>  regenerate the previews.
>
>  Mike
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