MP3 Gapless issue

[Tolriq]

Version

Media3 main branch

More version details

Can reproduce on main branch

Devices that reproduce the issue

All

Devices that do not reproduce the issue

N/A

Reproducible in the demo app?

Not tested

Reproduction steps

Play the 2 songs in a playlist.

Expected result

Should be fully gapless (and was previously)

Actual result

There's a small glitch between the files.

Logs shows

2026-04-03 22:03:52.921 Verbose ExoPlayer  Mp3Extractor - Data size mismatch between stream (33218028) and Xing frame (33217900), using Xing value.
2026-04-03 22:04:16.129 Verbose ExoPlayer  Mp3Extractor - Data size mismatch between stream (9268883) and Xing frame (9268755), using Xing value.

Some of the recent changes around that probably trigger this now.

Media

joni 0.zip

Bug Report

• You will email the zip file produced by adb bugreport to android-media-github@google.com after filing this issue.

[icbaker]

and was previously

At which version of media3 was the playback gapless?

[Tolriq]

Unfortunately the user don't know as always :( But I suppose 1.9 was working.
From git history maybe f1cb4ab could cause this ?

[Tolriq]

So @icbaker after investigating a little a made a quick fix, I used Codex to review and after it's comment (subtracting delay/padding directly inside computeDurationUs(), is risky because it would inflate CBR bitrate math and change VBR Xing behavior too, so I would not send that upstream.) I used it to actually try to propose the proper fix #3198