Changes between Version 15 and Version 16 of Encode/HighQualityAudio

Timestamp:

Apr 8, 2013, 7:52:15 PM (13 years ago)

Author:

Leon

Comment:

--

Encode/HighQualityAudio

@@ -82 +82 @@
 Please note that the bitrates listed here assumes the input audio channels is Stereo and the sample rate is >= 44.1Khz. Mono could require less bits.[[BR]]
 
-- '''libopus''' Recommended usable range '''>= 64Kbps'''. Compression artifacts start becoming unnoticeable around 96Kbps[[BR]]
-- '''libfdk_aac default LC-AAC profile.''' Recommended usable range '''VBR level 3 to 5''' (http://ffmpeg.org/trac/ffmpeg/wiki/AACEncodingGuide). Compression artifacts start becoming unnoticeable around VBR level 3 (Around 96Kbps)[[BR]]
-- '''(libfdk_aac or libaacplus) -profile:a aac_he_v2''' Recommended usable range '''<= 48Kbps CBR'''. Transparency: Does not reach transparency. Use LC-AAC instead to achieve transparency[[BR]]
-- '''(libfdk_aac or libaacplus) -profile:a aac_he''' Recommended usable range '''>= 48Kbps and <= 80Kbps CBR'''. Transparency: Does not reach transparency. Use LC-AAC instead to achieve transparency[[BR]]
-- '''libvorbis''' Recommended usable range '''>= 96Kbps'''. Compression artifacts start becoming unnoticeable around 96Kbps[[BR]]
-- '''libmp3lame''' Recommended usable range '''>= 128Kbps'''. Compression artifacts start becoming unnoticeable around 128Kbps[[BR]]
-- '''ac3 or eac3''' Recommended usable range '''>= 192kbps'''. Compression artifacts start becoming unnoticeable around 192Kbps[[BR]]
-- '''libfaac''' Recommended usable range '''>= 192kbps'''. Compression artifacts start becoming unnoticeable around 192Kbps. Some samples still show some artifacts[[BR]]
-- '''libtwolame''' Recommended usable range '''>= 192kbps'''. Compression artifacts start becoming unnoticeable around 192Kbps[[BR]]
-- '''mp2''' Recommended usable range '''>= 192kbps'''. Artifacts not so annoying as other encoders. Compression artifacts start becoming unnoticeable around 320Kbps[[BR]]
-- '''aac''' Recommended usable range '''>= 300kbps'''. Compression artifacts start becoming unnoticeable around 300Kbps[[BR]]
-- '''vorbis''' Recommended usable range '''>= 280kbps'''. Compression artifacts start becoming unnoticeable around 280Kbps[[BR]]
-- '''wmav1 or wmav2''' Recommended usable range '''>= ????kbps'''. Does not reach transparency. Notice artifacts on every bitrate. Broken?[[BR]]
-- '''libvo_aacenc''' Recommended usable range '''>= ????kbps'''. Does not reach transparency. Notice artifacts on every bitrate. Broken? [[BR]]
+- '''libopus''' Usable range '''>= 64Kbps'''. Recommended range >= 96Kbps[[BR]]
+- '''libfdk_aac default LC-AAC profile.''' Recommended range '''(VBR level 3 to 5) or >= 96Kbps CBR''' (http://ffmpeg.org/trac/ffmpeg/wiki/AACEncodingGuide). [[BR]]
+- '''(libfdk_aac or libaacplus) -profile:a aac_he_v2''' Usable range '''<= 48Kbps CBR'''. Transparency: Does not reach transparency. Use LC-AAC instead to achieve transparency[[BR]]
+- '''(libfdk_aac or libaacplus) -profile:a aac_he''' Usable range '''>= 48Kbps and <= 80Kbps CBR'''. Transparency: Does not reach transparency. Use LC-AAC instead to achieve transparency[[BR]]
+- '''libvorbis''' Usable range '''>= 96Kbps'''. Recommended range >= 128Kbps[[BR]]
+- '''libmp3lame''' Usable range '''>= 128Kbps'''. Recommended range >= 160Kbps[[BR]]
+- '''ac3 or eac3''' Usable range '''>= 128kbps'''. Recommended range >= 160Kbps[[BR]]
+- '''libfaac''' Usable range '''>= 192kbps'''. Recommended range >= 192Kbps.[[BR]]
+- '''libtwolame''' Usable range '''>= 192kbps'''. Recommended range >= 192Kbps[[BR]]
+
+The '''mp2''', '''aac''', '''vorbis''', '''wmav1/wmav2''' and '''libvo_aacenc''' encoders are not worth using.[[BR]]
+The '''wmav1/wmav2''' and '''libvo_aacenc''' encoders '''do not reach transparency at any bitrate'''.[[BR]]
+The '''mp2''' and '''aac''' encoders can still reach transparency at very high bitrates around '''300Kbps'''.[[BR]]
+The '''vorbis''' encoder does not use the bitrate specified in ffmpeg. Most of the times it does sound reasonable, but the bitrate is very high.
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@@ -103 +103 @@
 Transparency means the encoded audio sounds indistinguishable from the audio in the source file.[[BR]]
 [[BR]]
-TODO: Add ABC/HR tests.