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Does anyone know if the process QTFairUse uses is lossless?
If you were to compare the bit for bit output between an encrypted file, and one after being stripped of DRM, is there any difference?
- The process is lossless, yes. The application works by grabbing the decrypted AAC-audio bytes from memory after/as iTunes decrypts the tracks. If you were to compare the files bit-by-bit they would be different as you're going from encrypted data to decrypted data and we've got to put that decrypted data into a new AAC container. --
68.58.16.36 21:33, 24 October 2007 (UTC)
- He was asking if the output (raw PCM sound) would be bit-by-bit identical. 201.212.44.26 ( talk) 20:15, 28 November 2007 (UTC)
Portal:Free software: QTFairUse now the selected article
Just to let you know. The purpose of selecting an article is both to point readers to the article and to highlight it to potential contributors. It will remain on the portal for a week or so. The previous selected article was Open Source Tripwire, an intrusion detection system.
For other interesting free software articles, you can take a look at the archive of PFs selectees. -- Gronky 19:02, 14 October 2007 (UTC)
- Time goes by and the new selectee is Cygnus Solutions. Later bought by Red Hat, Cygnus was probably the first big free software development company. -- Gronky 21:10, 23 October 2007 (UTC)
"intercepts the unencrypted AAC data stream as it is sent to the sound card"? So the sound card is decompressing the stream? I would have expected iTunes to send already decompressed audio to the card... 201.212.44.26 ( talk) 20:15, 28 November 2007 (UTC)
- "So the sound card is decompressing the stream? I would have expected iTunes to send already decompressed audio to the card..." Of course the sound card is the one decompressing it, otherwise there would be no point in having a sound card as the cpu would be doing all the transitioning.
204.185.81.1 (
talk) 22:54, 20 February 2008 (UTC)
- Last time I checked, PC sound cards (or onboard audio) were just DACs, with some MIDI stuff thrown in. QTFairUse works by grabbing the AAC frames out of memory, after they've been decrypted but before being decoded to PCM data and sent to the sound card. See this comment -- Steved424 ( talk) 22:13, 6 December 2008 (UTC)
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| This redirect does not require a rating on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||
| ||||||||||||||||||
Does anyone know if the process QTFairUse uses is lossless?
If you were to compare the bit for bit output between an encrypted file, and one after being stripped of DRM, is there any difference?
- The process is lossless, yes. The application works by grabbing the decrypted AAC-audio bytes from memory after/as iTunes decrypts the tracks. If you were to compare the files bit-by-bit they would be different as you're going from encrypted data to decrypted data and we've got to put that decrypted data into a new AAC container. --
68.58.16.36 21:33, 24 October 2007 (UTC)
- He was asking if the output (raw PCM sound) would be bit-by-bit identical. 201.212.44.26 ( talk) 20:15, 28 November 2007 (UTC)
Portal:Free software: QTFairUse now the selected article
Just to let you know. The purpose of selecting an article is both to point readers to the article and to highlight it to potential contributors. It will remain on the portal for a week or so. The previous selected article was Open Source Tripwire, an intrusion detection system.
For other interesting free software articles, you can take a look at the archive of PFs selectees. -- Gronky 19:02, 14 October 2007 (UTC)
- Time goes by and the new selectee is Cygnus Solutions. Later bought by Red Hat, Cygnus was probably the first big free software development company. -- Gronky 21:10, 23 October 2007 (UTC)
"intercepts the unencrypted AAC data stream as it is sent to the sound card"? So the sound card is decompressing the stream? I would have expected iTunes to send already decompressed audio to the card... 201.212.44.26 ( talk) 20:15, 28 November 2007 (UTC)
- "So the sound card is decompressing the stream? I would have expected iTunes to send already decompressed audio to the card..." Of course the sound card is the one decompressing it, otherwise there would be no point in having a sound card as the cpu would be doing all the transitioning.
204.185.81.1 (
talk) 22:54, 20 February 2008 (UTC)
- Last time I checked, PC sound cards (or onboard audio) were just DACs, with some MIDI stuff thrown in. QTFairUse works by grabbing the AAC frames out of memory, after they've been decrypted but before being decoded to PCM data and sent to the sound card. See this comment -- Steved424 ( talk) 22:13, 6 December 2008 (UTC)