Mailing List Archive

#11184: Rewrite DVB profiles to filter unwanted streams instead of looking for
expected streams
--------------------------------+-----------------------------
Reporter: stuartm | Owner: danielk
Type: Developer Task | Status: new
Priority: minor | Milestone: unknown
Component: MythTV - Recording | Version: Master Head
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
--------------------------------+-----------------------------

Comment (by J.Pilk@…):

I don't know what the effect of this on dvb-t radio would be. Here's
ffmpeg -i analysis of a BBC Radio 3 recording with 'Normal' encoder
settings. When played it has an MHEG screen display that takes several
seconds to appear. 0.25-fixes.

Mediainfo lists only the 0x4b2 stream.

Input #0, mpegts, from '1703_20121018125800.mpg':[[BR]]
Duration: 01:09:58.92, start: 43167.824967, bitrate: 1412 kb/s[[BR]]
Program 1 [[BR]]
Stream #0:0[0x4b2](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, s16, 192 kb/s[[BR]]
Stream #0:1[0x4ba]: Unknown: none ([11][0][0][0] / 0x000B)[[BR]]
Stream #0:2[0x1ce9]: Unknown: none ([11][0][0][0] / 0x000B)[[BR]]
Stream #0:3[0x1c21]: Unknown: none ([11][0][0][0] / 0x000B)[[BR]]
Stream #0:4[0x1c22]: Unknown: none ([11][0][0][0] / 0x000B)[[BR]]
Stream #0:5[0x1c23]: Unknown: none ([11][0][0][0] / 0x000B)[[BR]]
Stream #0:6[0x1c24]: Unknown: none ([11][0][0][0] / 0x000B)[[BR]]
Stream #0:7[0x1c25]: Unknown: none ([11][0][0][0] / 0x000B)[[BR]]

--
Ticket URL: <http://code.mythtv.org/trac/ticket/11184#comment:1>
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#11184: Rewrite DVB profiles to filter unwanted streams instead of looking for
expected streams
--------------------------------+-----------------------------
Reporter: stuartm | Owner: danielk
Type: Developer Task | Status: new
Priority: minor | Milestone: unknown
Component: MythTV - Recording | Version: Master Head
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
--------------------------------+-----------------------------

Comment (by J.Pilk@…):

For info; I usually process such recordings with mplayer -dumpaudio
-dumpfile and keep the resulting .mp2 file. This plays in eg mythmusic
but inherits none of the metadata, which it would be nice to have. ffmpeg
-i from the above recording is:

Input #0, mp3, from '1703_20121018125800.mp2':
Duration: 01:09:58.92, start: 0.000000, bitrate: 192 kb/s
Stream #0:0: Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s

--
Ticket URL: <http://code.mythtv.org/trac/ticket/11184#comment:2>
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#11184: Rewrite DVB profiles to filter unwanted streams instead of looking for
expected streams
--------------------------------+-------------------------------
Reporter: stuartm | Owner: Klaas de Waal
Type: Developer Task | Status: assigned
Priority: minor | Milestone: needs_triage
Component: MythTV - Recording | Version: Master Head
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
--------------------------------+-------------------------------
Changes (by Stuart Auchterlonie):

* owner: danielk => Klaas de Waal
* status: new => assigned
* milestone: unknown => needs_triage


Comment:

Klaas, can you review and see if this is feasible?

--
Ticket URL: <https://code.mythtv.org/trac/ticket/11184#comment:3>
MythTV <http://www.mythtv.org>
MythTV Media Center

#11184: Rewrite DVB profiles to filter unwanted streams instead of looking for
expected streams
--------------------------------+-------------------------------
Reporter: stuartm | Owner: Klaas de Waal
Type: Developer Task | Status: assigned
Priority: minor | Milestone: needs_triage
Component: MythTV - Recording | Version: Master Head
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
--------------------------------+-------------------------------

Comment (by Klaas de Waal):

I did not even know this option existed... However, it looks like the
problem as described here has been solved already.

Configure recordings to use the MyGica? T230 USB tuner which is a
"DVB-T/S/C, ATSC or ISDB-T Tuner Card" device. Select "Hardware DVB
Encoders" profile "Low Quality" and changed the "Recording Type" to "Audio
Only".

Recording a TV program (audio plus video) with this profile then results
in a file with only the audio; the video is filtered out. This is the
expected result.

Select "Hardware DVB Encoders" profile "Low Quality" and changed the
"Recording Type" to "TV Only". Recording a radio program (audio only) with
this profile then results in a file with only audio. No error messages
because of a missing video stream, as indicated in the ticket.

Therefore I think this ticket can be closed.

There are some other remarks to be made about the Recording Profile
feature.

I think the best approach is to always record the complete program and at
playback time decide which streams to use. I do not see any real
advantage, other than a minimal space saving, of filtering out some of the
streams when making the recording. The disadvantage is clearly that, when
playing back, you might want the stream that has been filtered out.

There is one interesting feature and that is the "Record Full TS" option
which is documented in the help text to generate an additional".ts.raw"
file which then has the full contents of the transport stream. However, it
does not record the complete transport stream but it does add the complete
PSI information (NIT, SDT, PAT, PMT etc) of the transport stream to the
recording. This is useful because it is easier to do than make a full MPTS
recording, it is much smaller and it does have all the information needed
for debugging.

It is possible to generate a new profile in addition to "Default", "Live
TV", "High Quality" and "Low Quality". However, I could not find a way to
select the new profile in the "Storage Options", first entry, when making
a recording.

--
Ticket URL: <https://code.mythtv.org/trac/ticket/11184#comment:4>
MythTV <http://www.mythtv.org>
MythTV Media Center

#11184: Rewrite DVB profiles to filter unwanted streams instead of looking for
expected streams
--------------------------------+-------------------------------
Reporter: stuartm | Owner: Klaas de Waal
Type: Developer Task | Status: closed
Priority: minor | Milestone: needs_triage
Component: MythTV - Recording | Version: Master Head
Severity: medium | Resolution: Fixed
Keywords: | Ticket locked: 0
--------------------------------+-------------------------------
Changes (by Stuart Auchterlonie):

* status: assigned => closed
* resolution: => Fixed


Comment:

Closing based on Klaas's feedback

--
Ticket URL: <https://code.mythtv.org/trac/ticket/11184#comment:5>
MythTV <http://www.mythtv.org>
MythTV Media Center

#11184: Rewrite DVB profiles to filter unwanted streams instead of looking for
expected streams
--------------------------------+-------------------------------
Reporter: stuartm | Owner: Klaas de Waal
Type: Developer Task | Status: closed
Priority: minor | Milestone: 31.0
Component: MythTV - Recording | Version: Master Head
Severity: medium | Resolution: Fixed
Keywords: | Ticket locked: 0
--------------------------------+-------------------------------
Changes (by Stuart Auchterlonie):

* milestone: needs_triage => 31.0


--
Ticket URL: <https://code.mythtv.org/trac/ticket/11184#comment:6>
MythTV <http://www.mythtv.org>
MythTV Media Center