diff options
| author | Claudio Freire <klaussfreire@gmail.com> | 2015-07-20 22:53:24 -0300 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2015-07-27 19:13:48 +0200 |
| commit | 59216e0525a58714be4207be6ae8744750e62867 (patch) | |
| tree | 8c5b41b3471b08e17396c159001da6deff7ce347 /tests | |
| parent | c8c86b8f9b8c166633a7324c8646f38866801b88 (diff) | |
| download | ffmpeg-streaming-59216e0525a58714be4207be6ae8744750e62867.zip ffmpeg-streaming-59216e0525a58714be4207be6ae8744750e62867.tar.gz | |
AAC Encoder: clipping avoidance
Avoid clipping due to quantization noise to produce audible
artifacts, by detecting near-clipping signals and both attenuating
them a little and encoding escape-encoded bands (usually the
loudest) rounding towards zero instead of nearest, which tends to
decrease overall energy and thus clipping.
Currently fate tests measure numerical error so this change makes
tests using asynth (which are near clipping) report higher error
not less, because of window attenuation. Yet, they sound better,
not worse (albeit subtle, other samples aren't subtle at all).
Only measuring psychoacoustically weighted error would make for
a representative test, so that will be left for a future patch.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'tests')
| -rw-r--r-- | tests/fate/aac.mak | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tests/fate/aac.mak b/tests/fate/aac.mak index 7ebec45..9b08959 100644 --- a/tests/fate/aac.mak +++ b/tests/fate/aac.mak @@ -146,7 +146,7 @@ fate-aac-aref-encode: CMD = enc_dec_pcm adts wav s16le $(REF) -strict -2 -c:a aa fate-aac-aref-encode: CMP = stddev fate-aac-aref-encode: REF = ./tests/data/asynth-44100-2.wav fate-aac-aref-encode: CMP_SHIFT = -4096 -fate-aac-aref-encode: CMP_TARGET = 434 +fate-aac-aref-encode: CMP_TARGET = 594 fate-aac-aref-encode: SIZE_TOLERANCE = 2464 fate-aac-aref-encode: FUZZ = 5 @@ -155,7 +155,7 @@ fate-aac-ln-encode: CMD = enc_dec_pcm adts wav s16le $(TARGET_SAMPLES)/audio-ref fate-aac-ln-encode: CMP = stddev fate-aac-ln-encode: REF = $(SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav fate-aac-ln-encode: CMP_SHIFT = -4096 -fate-aac-ln-encode: CMP_TARGET = 65 +fate-aac-ln-encode: CMP_TARGET = 68 fate-aac-ln-encode: SIZE_TOLERANCE = 3560 FATE_AAC_LATM += fate-aac-latm_000000001180bc60 |
