However, I'm wondering if I should implement the same padder on qaac, since it will make the result no more identical with iTunes (or other Apple softwares). To tell the truth, qaac has the same gapless issue when encoded with -he. In order not to increase amount of enc_delay and padding, one AAC frame is discarded from each of beginning and ending, to compensate the padding added on our side. Whats more, Urd can also convert the two USB inputs into SPDIF output, for integration. Extrapolation is done both at beginning and ending, since ending only extrapolation didn't fix the issue on this sample.Īlso, this version adds one extra zero sample at beginning in case of SBR+PS, since FDK-AAC has odd enc_delay for SBR+PS, which cannot be exactly expressed in downsampled time scale (which is mandatory for iTunes compatibility). Urd is the only CD transport with USB output and two USB inputs. I found gapless playback issue on this sample when encoded with SBR (not annoying, but tiny pop is audible), so implemented improved gapless playback by the method used by Vorbis and Opus (extrapolation by linear prediction). This hacked qaac and used test files are in the attached file:įiles under CAF and M4A_2112 are unmodified HE-AAC files (You can play this CAF file gaplessly using my foo_input_caf).įiles under M4A_2112+481 was encoded using hacked qaac. Why all of this is happening? Is this correct? Winamp FhG encoder count this additional decoder delay into encoder delay of iTuneSMPB.fb2k doesn't trim additional decoder delay introduced by SBR tool.Using this hacked version of qaac, now I could get gapless HE-AAC playback on fb2k. It is designed to take advantage of the performance of the modern computers. It is easy to use and provides best audio quality. EZ CD Audio Converter includes only the audio components and codecs that provide the best audio quality. Add 481 to encoder delay of iTunSMPB, and also edit other values Description Files Comments 2 Tracker list EZ CD Audio Converter Overview EZ CD Audio Converter (formerly Easy CD-DA Extractor) is all-in-one software: Audio CD Ripper, Audio Converter, Metadata Editor, and Disc Burner.Append silence of 2048 samples to the end of input before sending to encoder.Next, I made hacked version of qaac, which basically do the following: Then I tried trimming the first 962 samples of the decoded wav file (encoded by Apple then decoded by fb2k), and I noticed that offset matches with the original. In ISO 14496-24:2008 (which you can read from the link at ), it is written that additional decoder delay introduced by SBR tool is 481 (which becomes 962 in upsampled scale). However, just out of curiosity, I looked into it further today. Personally I'm not using HE-AAC for music so I didn't care much about it so far. In short, fb2k can play FhG's HE-AAC gaplessly, and iTunes can play Apple's HE-AAC gaplessly, but fb2k cannot play Apple's HE-AAC gaplessly, etc. Key Features: – Easy to use – Optimized for best audio quality – Accurate audio CD ripping with error detection – Convert between audio formats with metadata preservation – Burn audio CDs, mp3 discs, and data discs – Automatic updates (free lifetime updates included) – Automatic high-quality cover art downloads – Features ReplayGain, normalization, silence removal – Convert audio from video files – Makes 1:1 copies of CDs and DVDs Power Features: – Fastest audio converter, can convert up to 8 files in parallel – Best audio codecs included – Automatically download metadata with high quality cover art from multiple services (GD3, MusicBrainz, Freedb) – Utilizes multi-core CPUs and multimedia instructions (SSE, MMX) for best performance – Gapless audio converting and gapless sample rate conversion – Creates and Burns Cue Sheets (.cue), all types – Full ReplayGain support – Rips hidden audio tracks (HTOA) – Supports CD-Text, ISRC, pre-gap, and pre-emphasis detection Typical EZ CD Audio Converter usages: – Transfer your CD collection to audio files – Convert audio files for your portable device or phone – Compress audio files to save hard drive space – Burn custom audio CDs – Burn audio files to audio CDs – Convert audio files for use as a ringtone – Convert audio files not supported by other software – Convert audio bites from video files – Manage metadata of audio files Operating System: Windows 7, 8/8.I knew that Apple and other software (at least fb2k and winamp FhG encoder) treats delay of HE-AAC differently. EZ CD Audio Converter is easy to use, fast, and has best audio quality. Rip audio CDs, make copies of discs, convert mp3, convert audio files, and burn audio CDs, MP3 CDs, and data discs. EZ CD Audio Converter 10.1.0.1 (圆4) Multilingual + Portable | 41.3/44.4 Mb EZ CD Audio Converter is CD Ripper, Audio Converter, Metadata Editor and Disc Burner.
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