FLAC skipping on section

VLC has a problem with this specific FLAC file. It skips (plays silence) over a particular section and outputs these errors if I increase the verbose level:

[00007fbb6cc02280] flac demux packetizer warning: discarding bytes as we're over framesize 14747, 27267
[00007fbb6cc02280] flac demux packetizer debug: emulated sync word
[0000555832ded700] main audio output warning: playback way too early (-212595): playing silence
[0000555832ded700] main audio output debug: inserting 10204 zeroes

This doesn't happen with any other media player I tried. I had a friend reproduce it on his VLC too. If I re-encode the FLAC with FFmpeg it doesn't happen anymore. It seems this particular bitstream causes the problem.

VLC 3.0.18-rc2 Vitinari

Note: the timestamps on the sample file are wrong because I cut the file with FFmpeg (with -c:a copy) to post it here. This isn't related to the problem.

changed the description

Here's a second example

VLC_skipping_bug_2.flac

Could you try again with a VLC nightly ? https://nightlies.videolan.org/

Is there an AppImage or Flatpak or standalone binary? I don't want to contaminate my system with Snap.

I compiled the 3.0.x branch from source. The same thing happens. I'll compile master now.

VLC4 skips over it instead of playing silence.

[00007fed24002fc0] flac demux packetizer warning: discarding bytes as we're over framesize 14747, 27267
[00007fed24002fc0] flac demux packetizer debug: emulated sync word
[00007fed24001b30] [clock] main generic warning: resetting master clock: coefficient too unstable: 0.371423

mentioned in issue #27454 (closed)

changed the description

Just to add some details.

• Resampling doesn't matter (tried Speex, soxr and libsamplerate, as well as setting JACK sample rate to 44.1KHz)
• Happens on both JACK and PulseAudio

Maybe these commits are responsible? I'll change it and report back.

• 07cd30a1
• affe9ad5

If I replace modules/packetizer/flac.h and modules/packetizer/flac.c with the ones from before a57c3a84 then the problem doesn't occur.

@fcartegnie Could you please take a look? This is your work.

Indeed you have

There's no regression, the bug was just hidden due to min frame size being enforced

added Component::Demuxers: Ogg label

removed Component::Demuxers: Ogg label

added Component::Packetizers label

marked this issue as related to #27454 (closed)

ff f8 59 a8 d7 8f 89 4e 02 ac fc 27 f9 ef fc d5
ff f8 59 a8 d7 90 d4 4e 02 1e 03 07 ff 0f fc d4

frames are 0x34F1 / 13553 away so that code shouldn't occur

I don't know anything about the FLAC bitstream format so I don't know what that means.

changed milestone to %3.0.x maintenance

on CRC failure, CRC value isn't reset properly

mentioned in merge request !2799 (merged)

@fcartegnie Is this gonna be fixed in 3.0.x too?

added Status::fixed label

closed

mentioned in merge request !2918 (merged)

mentioned in commit c2dd4bfe

changed milestone to %3.0.19

marked #27454 (closed) as a duplicate of this issue

marked #27609 (closed) as a duplicate of this issue

marked this issue as related to #27609 (closed)

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marked this issue as related to #27696 (closed)

Flac audio file (Rolling Stones - Have you seen your mother, baby) cuts out for one second in VLC a few seconds before end (at the 2:30 mark of the 2:38 total time of the file). This file plays fine in other audio players.

VLC 3.0.18 Warning log in Windows 10 (22H2, build 19045.2486) says:

flac warning: discarding bytes as we're over framesize 7330, 11121

main warning: playback way too early (-162800): playing silence

marked #27751 (closed) as a duplicate of this issue

marked this issue as related to #27751 (closed)

(Reported in #27751 (closed) (closed)) I have installed nightly build using vlc-3.0.19-win64-4c12f2ea.exe, the problem seems to be resolved. Executable tried to write to the registry boot area during install, is that normal? blocked by security software.

I can confirm that behavior! I was playing .flac music files and got dropouts suddenly (maybe 0,1 seconds silence) after every about 30 seconds. The audio files are perfectly fine, I tested them in other players, no issues.

marked #27454 (closed) as a duplicate of this issue

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marked vlc-ios#1484 (closed) as a duplicate of this issue

marked this issue as related to vlc-ios#1484 (closed)

removed the relation with #27505 (closed)

marked #27850 (closed) as a duplicate of this issue

marked this issue as related to #27850 (closed)