Modify
Warning Please read the Ticket HowTo before creating or commenting on a ticket. Failure to do so may cause your ticket to be rejected or result in a slower response.

Opened 9 months ago

Closed 9 months ago

#11714 closed Bug Report - General (fixed)

Noise when playing back MP3s in MythMusic

Reported by: stuartm Owned by: jyavenard
Priority: minor Milestone: 0.27
Component: MythTV - Audio Output Version: Master Head
Severity: medium Keywords:
Cc: Ticket locked: no

Description

With certain mp3s (more noticably than others) there is some 'static' like crackling present that isn't there when the same tracks are played back using ffplay (1.1.5). In a few tracks there is also a low frequency, low volume 'babbling brook' type noise. It's very much like the noise found in FM radio broadcasts.

The speaker configuration is stereo, audio settings are at the defaults.

Attachments (0)

Change History (5)

comment:1 Changed 9 months ago by stuartm

Let me add that I'm using ALSA, pulseaudio isn't running.

comment:2 Changed 9 months ago by paulh

  • Owner set to jyavenard
  • Status changed from new to assigned

Can't say I've noticed this but these days I spend most of my time listening to streaming radio.

Is this just with MythMusic or do you get the same result if you play the bad tracks using mythavtest and mythffplay?

The only changes to the playback side of MythMusic have been done by jya and were needed to keep MythMusic working after the ffmpeg re-sync AFAIK.

comment:3 follow-up: Changed 9 months ago by stuartm

MP3s aren't playing with mythavtest atm, they seem to continually seek every 500ms. It also does something I've never seen before and don't remember us adding, it displays the embedded coverart on-screen? We can look at that another time since it's not related to the reported problem.

We aren't building mythffplay any more and I need to find out how to re-enable that before I can try it.

comment:4 in reply to: ↑ 3 Changed 9 months ago by paulh

Replying to stuartm:

MP3s aren't playing with mythavtest atm, they seem to continually seek every 500ms. It also does something I've never seen before and don't remember us adding, it displays the embedded coverart on-screen? We can look at that another time since it's not related to the reported problem.

They play OK here. Sounds like your mp3s have an idcin video stream which is known to cause problems although I thought jya fixed that recently.

We aren't building mythffplay any more and I need to find out how to re-enable that before I can try it.

You need to add --enable-sdl to configure

comment:5 Changed 9 months ago by Jean-Yves Avenard <jyavenard@…>

  • Resolution set to fixed
  • Status changed from assigned to closed

In 34651274749befb422371d4979a62019f94b21d9/mythtv:

Fix audio corruption under some circumstances

Clipping was incorrectly done when converting floats to S32 (1.0f became 0x800000000 which is -2147483648 instead of 2147483647)

Disable Float->S32 SSE code for the time being (problem only fixed in C)

Fixes #11714

Add Comment

Modify Ticket

Action
as closed .
The resolution will be deleted. Next status will be 'new'.
Author


E-mail address and user name can be saved in the Preferences.

 
Note: See TracTickets for help on using tickets.