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IDProjectCategoryView StatusDate SubmittedLast Update
0000373eac3tobugpublic2015-12-29 16:392016-11-24 02:50
Reportershr3k 
Assigned To 
PrioritynormalSeverityminorReproducibilityhave not tried
StatusnewResolutionopen 
PlatformOSOS Version
Summary0000373: AC3 encoder delay
DescriptionHi, a some time ago I found that AC3 encoder in eac3to produces some delay in output file. With comparison in Audacity it can be compensated by adding -5ms to command line (produced AC3 will be still 16 samples at 48 kHz behind the original source).
Steps To ReproduceTake some sound file. Encode it to AC3. Decode it to FLAC. Open in Audacity and compare waveform.
TagsNo tags attached.
eac3to Version3.31
Attached Fileszip file icon delay.zip [^] (927,678 bytes) 2015-12-29 16:39

- Relationships

-  Notes
(0001503)
tebasuna51 (reporter)
2016-11-24 02:50

All encoders, even commercial ones, produce a delay in output because need initialize the soft and send a initial silence before send the input audio.

AC3 encoders send 256 PCM samples of silence, at samplerate 48000 is 5.333... ms

A workaround using Aften encoder is use the parameter -pad 0, but don't know a equivalence using ffmpeg.

BTW the problem is not related with eac3to but with each encoder.

- Issue History
Date Modified Username Field Change
2015-12-29 16:39 shr3k New Issue
2015-12-29 16:39 shr3k File Added: delay.zip
2016-11-24 02:50 tebasuna51 Note Added: 0001503


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