Gapless playback - spotify / local files - hearable interception

[hdijkema]

Thank you for continuous gstreamer support, i.e. no noticable on/off noises on my stereo anymore.
However, There's still a gap between songs played back with mopidy, whereas MPD has true gapless playback. I experience this both on my local collection and on spotify.

The next step?

[adamcik]

To the best of my knowledge we've now implemented this per how GStreamer intends gapless to work. If it's still a problem there isn't much more we can do in Mopidy I'm afraid (though I'm happy to be proven wrong).

Can you reproduce with gst-play-1.0 --gapless file:///... file:///... ... so we can see if it works "upstream"?

[hdijkema]

Oke, I've done following:

gst-play-1.0 --gapless ./01\ -\ Fire\ And\ Ice\ .mp3 ./02\ -\ Lookin'
For\ A\ Stranger\ .mp3

and:

mpg123 01\ -\ Fire\ And\ Ice\ .mp3 02\ -\ Lookin'\ For\ A\ Stranger\ .mp3

With gst-play-1.0 ==> Noticeable gap.
With mpg123 ==> No gap.
With mpd ==> No gap.

So, maybe this is a bug for gstreamer?

2016-02-25 18:01 GMT+01:00 Thomas Adamcik notifications@github.com:

To the best of my knowledge we've now implemented this per how GStreamer
intends gapless to work. If it's still a problem there isn't much more we
can do in Mopidy I'm afraid (though I'm happy to be proven wrong).

Can you reproduce with gst-play-1.0 --gapless file:///... file:///... ...
so we can see if it works "upstream"?

—
Reply to this email directly or view it on GitHub
#1467 (comment).

[hdijkema]

If you want the mp3's for testing purposes, that can be arranged.

2016-02-25 18:26 GMT+01:00 Hans Dijkema hans@dykema.nl:

Oke, I've done following:

gst-play-1.0 --gapless ./01\ -\ Fire\ And\ Ice\ .mp3 ./02\ -\ Lookin'
For\ A\ Stranger\ .mp3

and:

mpg123 01\ -\ Fire\ And\ Ice\ .mp3 02\ -\ Lookin'\ For\ A\ Stranger
.mp3

With gst-play-1.0 ==> Noticeable gap.
With mpg123 ==> No gap.
With mpd ==> No gap.

So, maybe this is a bug for gstreamer?

2016-02-25 18:01 GMT+01:00 Thomas Adamcik notifications@github.com:

To the best of my knowledge we've now implemented this per how GStreamer
intends gapless to work. If it's still a problem there isn't much more we
can do in Mopidy I'm afraid (though I'm happy to be proven wrong).

Can you reproduce with gst-play-1.0 --gapless file:///... file:///... ...
so we can see if it works "upstream"?

—
Reply to this email directly or view it on GitHub
#1467 (comment).

[irskep]

I'm also having issues with gapless playback. If I start a track in a web client and let it play all the way through, there's an audible gap before the next track. I'm testing with Pink Floyd's "The Wall".

gst-play-1.0 from the command line seems to do much better, though there's still a tiny gap compared to playing the same tracks in iTunes.

[kmontag]

I'm experiencing gaps between FLAC files about 90% of the time. Occasionally there's no audible gap, and otherwise the length of the gap seems to vary. Playback via gst-play-1.0 is consistently gapless.

I've tried adjusting audio.buffer_time, but it doesn't seem to have any effect.

This is on MacOS Mojave with the local backend.

$ gst-launch-1.0 --gst-version
GStreamer Core Library version 1.14.4
$ mopidy --version
/usr/local/lib/python2.7/site-packages/pylast/__init__.py:51: UserWarning: You are using pylast with Python 2. Pylast will soon be Python 3 only. More info: https://github.com/pylast/pylast/issues/265
  UserWarning,
Mopidy 2.2.0

Any other debug info I can provide?

[kingosticks]

A debug log where the issue occurs: https://docs.mopidy.com/en/latest/troubleshooting/#debug-logging

[CraftedCart]

Looks like this is resolved in an upcomming gstreamer release for MP3s I think - Just looking at this merge request https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1028

Since I've noticed MP3 files weren't playing gapless for me (MP3s being the kind of files OP mentioned in when they tried to run gst-play-1.0 above) - I slightly hacked up the PKGBUILD (build+packaging script) for gstreamer on Arch to get it to build from the main branch and..yeah MP3 albums seem to play gapless for me now.