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Ticket #10584: mpeg2 seektable generators are inconsistent

 

 

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noreply at mythtv

Apr 12, 2012, 3:53 AM

Post #1 of 7 (320 views)
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Ticket #10584: mpeg2 seektable generators are inconsistent

#10584: mpeg2 seektable generators are inconsistent
----------------------+--------------------------------------
Reporter: J.Pilk@… | Type: Bug Report - General
Status: new | Priority: minor
Milestone: unknown | Component: MythTV - General
Version: 0.25 | Severity: medium
Keywords: | Ticket locked: 0
----------------------+--------------------------------------
mythtv-0.25-283_v0.25_rc_156_g02216ca.el6.rpm fromATrpms

Seektables generated during recording, or by mythcommflag --rebuild, or by
mythtranscode --mpeg2 --buildindex, are not the same. I demonstrated
this by making MythArchives of a short recording 'raw' and after running
each command, and examining the .xml files created. The mythcommflag
version does not include a mark=0 entry and the offsets (byte positions)
from both commflag and transcode are then consistently 188 bytes greater
than the 'raw' value. Maybe a within-packet offset got counted twice?

This was a recording from dvb-t. I'll check to see if HD dvb-t2
recordings show a similar raw/mythcommflag discrepancy.

raw <recordedseek>
<mark offset="188" type="9" mark="0"/>
<mark offset="461164" type="9" mark="30"/>


mythcommflag <recordedseek>
<mark offset="461352" type="9" mark="30"/>
<mark offset="812724" type="9" mark="60"/>

mythtranscode <recordedseek>
<mark offset="376" type="9" mark="0"/>
<mark offset="461352" type="9" mark="30"/>

--
Ticket URL: <http://code.mythtv.org/trac/ticket/10584>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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noreply at mythtv

Apr 12, 2012, 5:37 AM

Post #2 of 7 (315 views)
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Re: Ticket #10584: mpeg2 seektable generators are inconsistent [In reply to]

#10584: mpeg2 seektable generators are inconsistent
----------------------------------+-------------------------
Reporter: J.Pilk@… | Owner:
Type: Bug Report - General | Status: new
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: 0.25
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
----------------------------------+-------------------------

Comment (by J.Pilk@…):

With dvb-t2 HD recording: here the discrepancy in frame numbering is a
complete keyframe interval.
FWIW the recording was started mid-programme, from the EPG screen.

raw:
<channel callsign="Channel 4 HD" channum="52" chanid="1052"
name="Channel 4 HD"/>
<recordedseek>
<mark offset="376" type="9" mark="0"/>
<mark offset="427512" type="9" mark="24"/>
<mark offset="1044904" type="9" mark="48"/>
<mark offset="1654400" type="9" mark="72"/>
<mark offset="2244720" type="9" mark="96"/>

commflag:
<channel callsign="Channel 4 HD" channum="52" chanid="1052"
name="Channel 4 HD"/>
<recordedseek>
<mark offset="1044904" type="9" mark="24"/>
<mark offset="1654400" type="9" mark="48"/>
<mark offset="2244720" type="9" mark="72"/>
<mark offset="2847636" type="9" mark="96"/>
<mark offset="3454312" type="9" mark="120"/>

--
Ticket URL: <http://code.mythtv.org/trac/ticket/10584#comment:1>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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noreply at mythtv

Apr 12, 2012, 5:15 PM

Post #3 of 7 (311 views)
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Re: Ticket #10584: mpeg2 seektable generators are inconsistent [In reply to]

#10584: mpeg2 seektable generators are inconsistent
----------------------------------+--------------------------
Reporter: J.Pilk@… | Owner: beirdo
Type: Bug Report - General | Status: assigned
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: 0.25
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
----------------------------------+--------------------------
Changes (by beirdo):

* owner: => beirdo
* status: new => assigned


Comment:

I'll take a look at this.

--
Ticket URL: <http://code.mythtv.org/trac/ticket/10584#comment:2>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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noreply at mythtv

Apr 17, 2012, 6:49 AM

Post #4 of 7 (311 views)
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Re: Ticket #10584: mpeg2 seektable generators are inconsistent [In reply to]

#10584: mpeg2 seektable generators are inconsistent
----------------------------------+--------------------------
Reporter: J.Pilk@… | Owner: beirdo
Type: Bug Report - General | Status: assigned
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: 0.25
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
----------------------------------+--------------------------

Comment (by J.Pilk@…):

Thanks for that. This is relevant too.
http://code.mythtv.org/trac/ticket/10606#comment:4

--
Ticket URL: <http://code.mythtv.org/trac/ticket/10584#comment:3>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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noreply at mythtv

May 3, 2012, 11:04 PM

Post #5 of 7 (294 views)
Permalink
Re: Ticket #10584: mpeg2 seektable generators are inconsistent [In reply to]

#10584: mpeg2 seektable generators are inconsistent
----------------------------------+--------------------------
Reporter: J.Pilk@… | Owner: beirdo
Type: Bug Report - General | Status: assigned
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: 0.25
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
----------------------------------+--------------------------

Comment (by mdean):

FWIW, we should probably remove one or both of mythtranscode --buildindex
and mythcommflag --rebuild (if removing both, the functionality would go
into mythutil, instead--since rebuilding the seek data is neither
transcoding the recording nor flagging commercials).

--
Ticket URL: <http://code.mythtv.org/trac/ticket/10584#comment:4>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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noreply at mythtv

Jun 12, 2012, 3:47 AM

Post #6 of 7 (264 views)
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Re: Ticket #10584: mpeg2 seektable generators are inconsistent [In reply to]

#10584: mpeg2 seektable generators are inconsistent
----------------------------------+--------------------------
Reporter: J.Pilk@… | Owner: beirdo
Type: Bug Report - General | Status: assigned
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: 0.25
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
----------------------------------+--------------------------

Comment (by J.Pilk@…):

More observations on this here:

http://www.gossamer-threads.com/lists/mythtv/users/520055#520055

--
Ticket URL: <http://code.mythtv.org/trac/ticket/10584#comment:5>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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noreply at mythtv

Mar 24, 2013, 6:44 AM

Post #7 of 7 (189 views)
Permalink
Re: Ticket #10584: mpeg2 seektable generators are inconsistent [In reply to]

#10584: mpeg2 seektable generators are inconsistent
----------------------------------+------------------------
Reporter: J.Pilk@… | Owner: beirdo
Type: Bug Report - General | Status: closed
Priority: minor | Milestone: 0.26.1
Component: MythTV - General | Version: 0.25
Severity: medium | Resolution: Fixed
Keywords: | Ticket locked: 0
----------------------------------+------------------------
Changes (by stichnot):

* status: assigned => closed
* resolution: => Fixed
* milestone: unknown => 0.26.1


Comment:

This is most likely fixed as a result of commits related to #11328. If
there are still problems in 0.26 related to the recorder seektable, then
it is probably a dup of #11459.

--
Ticket URL: <http://code.mythtv.org/trac/ticket/10584#comment:6>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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