#9270 closed defect (fixed)
8-Bit FLAC Playback Skips Silent Portions
| Reported by: | nikku4211 | Owned by: | |
|---|---|---|---|
| Priority: | important | Component: | avcodec |
| Version: | git-master | Keywords: | FLAC regression |
| Cc: | nikku4211 | Blocked By: | |
| Blocking: | Reproduced by developer: | yes | |
| Analyzed by developer: | no |
Description
Summary of the bug: When using FFPlay to play an 8-bit .FLAC, its silent portions are often skipped over during playback.
I use programs like MPC-HC that use FFMPEG as a basis for audio and video playback.
I have consistently noticed that these programs tend to play 8-bit .FLACs incorrectly, skipping over silent portions, which can mess up timing for music, audio skits, tests, etc.
How to reproduce:
% ffplay -i mptrendertest.flac ffmpeg version 2021-05-26-git-7a879cce37 built on 2021-05-26
Attachments (2)
Change History (8)
by , 4 years ago
| Attachment: | MPTRenderTest.flac added |
|---|
by , 4 years ago
| Attachment: | ffplay-20210529-211506.log added |
|---|
The .log output from FFPlay when playing the sample .FLAC file included.
follow-up: 2 comment:1 by , 4 years ago
| Component: | ffplay → avcodec |
|---|---|
| Keywords: | regression added; 8-bit ffplay removed |
| Priority: | normal → important |
| Reproduced by developer: | set |
For future tickets: Please do not report issues against ffplay if they are reproducible with ffmpeg.
Regression since 60a684939ab61dbfdf55105907808e015e5f6ec2
follow-up: 3 comment:2 by , 4 years ago
Replying to Carl Eugen Hoyos:
Regression since 60a684939ab61dbfdf55105907808e015e5f6ec2
Is that the same regression that is in #9185?? That means our flac is not lossless at all. Wow.
follow-up: 4 comment:3 by , 4 years ago
Replying to Balling:
Replying to Carl Eugen Hoyos:
Regression since 60a684939ab61dbfdf55105907808e015e5f6ec2
Is that the same regression that is in #9185??
Are you asking if 60a684939ab61dbfdf55105907808e015e5f6ec2 and 9300de0409d52272387a9b9d84143dba212291f4 are the same commit?
comment:4 by , 4 years ago
Replying to Carl Eugen Hoyos:
Are you asking if 60a684939ab61dbfdf55105907808e015e5f6ec2 and 9300de0409d52272387a9b9d84143dba212291f4 are the same commit?
So two different regressions, wow.
comment:5 by , 3 years ago
maybe those silence portions have crc16 mismatch?? I thought we do not verify crc16.
ffmpeg.exe -i MPTRenderTest.flac -c:a pcm_s8 -f md5 -
prints md5 as in flac head now after 2ed5925e26f77fc377cedcefb3864dc1a4712210
comment:6 by , 2 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
An 8-bit FLAC file showing a beat. On FFPlay and FFMPEG-based programs, the silent portions, crucial to timing, are skipped.