[FFmpeg-trac] #11578(ffmpeg:open): Waveform discontinuity in decoded E-AC-3
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Mon May 26 21:16:36 EEST 2025
#11578: Waveform discontinuity in decoded E-AC-3
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Reporter: j7n | Owner: mkver
Type: defect | Status: open
Priority: normal | Component: ffmpeg
Version: unspecified | Resolution:
Keywords: eac3 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by j7n):
What is wrong in CC 2017? I notice that the top bands are sightly lower
level, and the dithering doesn't have a spike on every block of 256
samples.
Where is the fault with these two tracks not being gapless in MP4? They
have an overlap of 2 frames (3072 samples). In "edts"/"elst" track 05 has
a recorded delay of 2688 samples, which are discarded by ffmpeg from the
start. To achieve gaplessness, 384 more samples should be deleted, which
doesn't happen. Track 04 has a duration of 0x38FE80 - delay of 0x0800 =
0x38F680. The actual decoded duration is decimal 3733504 (384 longer). I
can open another issue if it is warranted.
https://pixeldrain.com/u/RnRtVeKg
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Ticket URL: <https://trac.ffmpeg.org/ticket/11578#comment:7>
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