[k3b] [Bug 386105] K3b FFmpeg decode plugin seems to be broken, produces noise

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https://bugs.kde.org/show_bug.cgi?id=386105

--- Comment #6 from blaze at vivaldi.net ---
I found that every frame produced by fillOutputBuffer() contains (some patch
of) corrupted data just right after the middle.

Also citing the FFMPEG docs:

>Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input and output. This means that for some packets they will not immediately produce decoded output and need to be flushed at the end of decoding to get all the decoded data. Flushing is done by calling this function (avcodec_decode_audio4()) with packets with avpkt->data set to NULL and avpkt->size set to 0 until it stops returning samples. It is safe to flush even those decoders that are not marked with AV_CODEC_CAP_DELAY, then no samples will be returned.

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