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FFMS / ffms2

An FFmpeg based source library and Avisynth/VapourSynth plugin for easy frame accurate access
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Missing audio samples at beginnig #221

Closed combucha closed 8 years ago

combucha commented 9 years ago

Container MP4 with AVC+AAC LC If I open thru FFMS2v2.20 and older versions, decoded audio stream has around 54ms of silence (padding of aac, exactly 2624 samples here). I always thought that these samples were discarded during indexing and I'm A/V synced in VirtualDub. It's about containers without any elst atom defining A/V sync (if audio elst atom exist, its value is respected in output audio). Now the same MP4 opened with FFMS2v.2.21 (and latest RC2) has cutted audio stream at beginning. Looks like improper audio indexing or removing aac padding silence - around 100ms of audio at beginning is absent. What causes this issue?

slajar commented 9 years ago

Well, those samples are only discard if you select the appropriate delay option. See: https://ffmpegsource.googlecode.com/svn/trunk/doc/ffms2-avisynth.html at "adjustdelay"

combucha commented 8 years ago

Will close it since it's no longer actual and cannot reproduce this issue with current version. It was independent from adjustdelay switch.