Mailing List Archive

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: JYA
Type: Bug Report - General | Status: new
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by gribnif):

I am also running into this problem. It is especially bad, since I have
about 1000 recordings that will no longer play. I generated a log file for
you:

https://pastebin.com/EpL18XvL

and you can download the original file played (111 Mb in size) here:

https://drive.google.com/file/d/10goiT7FPoB6GltxNl_0aK47az6z-
xfF_/view?usp=sharing

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:1>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: JYA
Type: Bug Report - General | Status: new
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by ccandreva):

I am having the same problem with older files. Attached is the Lspci and
mththfrontend --version for my system . Please let me know what other
information I can provide. While these are older recordings ,, I kept them
and would like to be able to play them.

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:2>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: JYA
Type: Bug Report - General | Status: new
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------
Changes (by ccandreva):

* Attachment "Ccandreva-Lspci.txt" added.

Output of uname -a and lspci on my frontend

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: JYA
Type: Bug Report - General | Status: new
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------
Changes (by ccandreva):

* Attachment "CCandreva-Mythfrontend.txt" added.

Output of mythfrontend --version

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: JYA
Type: Bug Report - General | Status: new
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by Klaas de Waal):

Here on both v30 and master the video file does play but at half the
speed. The audio does have lots of noise but the original sound is still
recognizable.

When playing the video, pressing Menu / Playback / Playback Data gives
info about the video in a black bar on top of the screen.
This shows "Video: 720x480@29.97 fps" but also "FPS:14.99+-0.00:". It also
shows "AUDIO: NONE".

It looks to me that the wrong playback speed of 15fps instead of 30fps is
the problem here.

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:3>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: JYA
Type: Bug Report - General | Status: new
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------
Changes (by Klaas de Waal):

* Attachment "MythTV Frontend_007.png" added.

Playback data of the nuppel video file 13459.nuv on today's master

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: JYA
Type: Bug Report - General | Status: new
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by eyaleb):

I cannot play any nuv file. I get only loud hiss and slow video.
Please give this ticket a higher priority.

I originally reported this on mythtv-users@mythtv.org list on 28/Aug:

---------------- copy of report
The newest nuv file I have is from mid 2014, so I do not often watch these
recordings.
I now find that all nuv files produce only a very loud hiss and the video
is slow.

mpg and ts files play just fine. vlc and mplayer play everything clearly.
I fiddled with the frontend audio settings - no change.

I am on (almost) up-to-date fedora 30. This is a standard (7yo) desktop,
using the onboard audio.
I consider my setup very vanilla.

$ lspci
...
00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family High
Definition Audio Controller (rev 04)

$ uname -a
Linux e7.eyal.emu.id.au 5.2.8-200.fc30.x86_64 #1 SMP Sat Aug 10 13:21:39
UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

$ mythfrontend --version
Please attach all output as a file in bug reports.
MythTV Version : v30.0-v30.0-53-g6bd8cd4993
MythTV Branch : fixes/30
Network Protocol : 91
Library API : 30.20181231-1
QT Version : 5.12.1
Options compiled in:
linux debug use_hidesyms using_alsa using_jack using_oss using_pulse
using_pulseoutput using_backend using_bdjava using_bindings_perl
using_bindings_python using_bindings_php using_crystalhd using_dvb
using_firewire using_frontend using_hdhomerun using_vbox using_ceton
using_hdpvr using_ivtv using_joystick_menu using_libcec using_libcrypto
using_libdns_sd using_libfftw3 using_libxml2 using_lirc using_mheg
using_opengl using_opengl_video using_opengl_themepainter using_qtwebkit
using_qtscript using_qtdbus using_taglib using_v4l2 using_x11
using_xnvctrl using_xnvctrl_external using_libbluray_external using_xrandr
using_xv using_debugtype using_systemd_notify using_systemd_journal
using_bdjava using_bindings_perl using_bindings_python using_bindings_php
using_fontconfig using_freetype2 using_mythtranscode using_opengl
using_vaapi using_vaapi2 using_vdpau using_ffmpeg_threads using_mheg
using_libass using_libxml2 using_libmp3lame

Testing on another (10yo) PC shows the same problem. Both systems were
upgraded from f28 (mythtv 19.1) last month.

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:4>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: JYA
Type: Bug Report - General | Status: new
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by gribnif):

With some pointers from Mark Kendall, I am slowly working on this problem.
It appears to lie in the native NuppelDecoder, as it's possible to skirt
the problem by modifying the code to use FFMpeg to decode the video
instead. I'll post back when I have discovered the specific commit that
introduced the problem, and a suggested fix, if I find one.

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:5>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: mark-kendall
Type: Bug Report - General | Status: assigned
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------
Changes (by Stuart Auchterlonie):

* owner: JYA => mark-kendall
* status: new => assigned


--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:6>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: mark-kendall
Type: Bug Report - General | Status: assigned
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by eyaleb):

Further to my earlier comment, the problem persists on a new (Z390) server
using the onboard Intel GPU.

And good to see the issue is now getting attention, much appreciated.

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:7>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: mark-kendall
Type: Bug Report - General | Status: assigned
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by gribnif):

Update: I isolated the problem down to commits d24aa8 and b7befa.
Unfortunately, these represent a very large ffmpeg re-sync, so finding the
specific reason for the problem will be difficult.

I have suggested to Mark that perhaps removing the functionality provided
by NuppelDecoder.cpp is the best way to go, since ffmpeg seems to handle
things (almost entirely) correctly without it.

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:8>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: mark-kendall
Type: Bug Report - General | Status: closed
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution: fixed
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------
Changes (by Mark Kendall <mark.kendall@…>):

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


Comment:

In [changeset:"0872089201dc34850e36403110690edf8c9166bd/mythtv"
087208920/mythtv]:
{{{
#!CommitTicketReference repository="mythtv"
revision="0872089201dc34850e36403110690edf8c9166bd"
Fix playback of nuppel recordings

- closes #13459
}}}

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:9>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: mark-kendall
Type: Bug Report - General | Status: closed
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution: fixed
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by Stuart Auchterlonie):

Mark,

does this need cherry-picking back to fixes/31?
It appears to only be in master at the moment.


Regards
Stuart

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:10>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: mark-kendall
Type: Bug Report - General | Status: closed
Priority: minor | Milestone: needs_triage
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution: fixed
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------

Comment (by mark-kendall):

It is already in both fixes/30 and fixes/31:

https://github.com/MythTV/mythtv/commit/0872089201dc34850e36403110690edf8c9166bd
#diff-d3e47290e91d8a631e355d5870c9e1b5

https://github.com/MythTV/mythtv/commit/7762e2c181494ba3270ce3d80e104d7e265f7a8d
#diff-d3e47290e91d8a631e355d5870c9e1b5

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:11>
MythTV <http://www.mythtv.org>
MythTV Media Center

#13459: v30.0 - multiple frontends - audio plays as white noise on playback of
transcoded files
-----------------------------------+------------------------------
Reporter: robbak | Owner: mark-kendall
Type: Bug Report - General | Status: closed
Priority: minor | Milestone: 30.1
Component: MythTV - Audio Output | Version: v30-fixes
Severity: medium | Resolution: fixed
Keywords: | Ticket locked: 0
-----------------------------------+------------------------------
Changes (by Stuart Auchterlonie):

* milestone: needs_triage => 30.1


Comment:

Thanks, that'll be the trac hooks crapping out then!

Cheers
Stuart

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13459#comment:12>
MythTV <http://www.mythtv.org>
MythTV Media Center