Talk:Audio file format
|This is the talk page for discussing improvements to the Audio file format article.|
- 1 Content confusion
- 2 Content confusion comment
- 3 External links
- 4 Value of ON content and quality of reference
- 5 Linked from Wired.com
- 6 What does this sentence mean?
- 7 What about .m4a and .aac?
- 8 No Speaker needed
- 9 Confusing negative
- 10 More Formats
- 11 FLAC vs PCM (or whatever Red Book audio is called)
- 12 Conversion
- 13 which is better
- 14 MOD files
- 15 Article is fundamentally broken
- 16 Some omissions and suggested inclusions
- 17 CDA is not an audio file format
- 18 wav free and open?
- 19 Apple Lossless not in list
- 20 Acoustic waves - Is "Lossless" a misnomer?
- 21 Sound Sample Formats are missing
There appears to be some confusion as to the content of this page, the opening sentence (correctly, imo) describes an audio file format as a container format for audio data while most of the article discusses audio formats, i.e. compressed vs uncompressed data which is not necessarily related to the audio file format. Any comments on this? --22.214.171.124 19:46, 28 April 2007 (UTC)
Content confusion comment
I agree with the comment about the confusion between file formats and audio encodings. Also, the article implies that Microsoft's WAV format always carries uncompressed PCM audio. In fact it can carry many encoding types. See for instance, http://msdn2.microsoft.com/en-us/library/ms713497.aspx and http://graphics.cs.uni-sb.de/NMM/dist-0.9.1/Docs/Doxygen/html/mmreg_8h.html Gobbag 16:57, 22 May 2007 (UTC)
I suggest the removal of two of the three existing external links: "libsndfile" and "". The former seems to be an advertisement and the latter is off-topic (contrary to the label). Can anyone give me a good reason why either of these should stay? Uriah923 19:33, 19 August 2005 (UTC)
Value of ON content and quality of reference
Linked from Wired.com
The multiple channel section in misinformative. To my knowledge, multiple channels are still created by two channels. The section suggests a 5.1 system. On the market today there are two ways to get 5.1 audio. DTS and Dolby, only the latter one is talked about.
What does this sentence mean?
- Despite its name, there are many file formats for storing audio files.
How does its name discourge one from believing that there are multiple means of storage???
Probably because the title of the article is: Audio File Format, which is singular...not Audio File Formats
What about .m4a and .aac?
These two formats should probably be included, yes? Markhurst 21:41, 10 October 2006 (UTC)
- And OGG? Oddity- 14:02, 12 January 2007 (UTC)
No Speaker needed
I suggest dropping the reference in the intro to the "sampling of the votage corresponding to the speaker membrance position"
Where a speaker membrane is has nothing to do with sampling nor coding. A file never has to even "see" a speker to be created.
The reference just serves to confuse.RSFRASER 18:52, 16 November 2006 (UTC)
- Well, what the heck do the samples stand for then? That question is exactly what brought me here, and I cannot find the answer. Is the instantaneous sound-pressure-level emitted by a sound-reproduction system supposed to be proportional to the value of the sample? If no, then what? —Preceding unsigned comment added by 126.96.36.199 (talk) 09:49, 29 December 2010 (UTC)
This article starts with the sentence, "The general approach towards storing digital audio formats is not to sample the audio..." The word "not" in here appears to be an error, but I will let someone more qualified make this decision.
- The "not" was added by an anonymous user, and was incorrect. I have undone that edit. The Wilschon 00:33, 7 April 2007 (UTC)
Can anybody add some more audio formats like .aa from audible?
FLAC vs PCM (or whatever Red Book audio is called)
I've read somewhere (but now of course, cannot find a solid reference to), that Red Book Audio actually stores two bits on physical media for every bit that is necessary to play. This helps in scrathes on the physical media (and is used to advantage in some DRM schemes). Basically CD players take the average of both of the bit values - or if one is unreadable, they use the other one. With that information you get a bit-stream avaiable to play on a speaker.
Now, I've heard that there's a audio file format (I believe it is FLAC - but I could be wrong), that says: Hey, we're storing shit digitally (and copying it), so we'll never have physical read errors - and storing two bits for every bit that we need to play is a serious waste of space. Let's just strip out half of that file and save one bit for each bit needed to play, and we'll work out other ways to backup our shit. So this file format basically reads like a CD player, averages, and outputs a single bit stream, which cuts the space needed in half, while giving you a true, lossless copy of the digital information on a CD.
But I'm not familiar enough with it, and can't (easily) find any sources to confirm this, and I'm not sure which file format it is.
What is the name of this file format. And for good measure, what's the name of the file format used on physical CDs? Besides Red Book Audio.
~ender 2007-11-30 23:13:PM MST
which is better
Since we talk about MIDI files, couldn't we talk about module files too ?
Article is fundamentally broken
Some omissions and suggested inclusions
I came to this page hoping for info on the sample rates and bit depths supported by Apple Lossless format; this seems like info that would be relevant for all the formats being discussed here. BTW, I know Apple lossless supports 24-bit but I'm seeing much misinformation elsewhere that it's limited to 16-bit. Haven't found an official Apple spec sheet after a brief effort.
Would a chart of origin/common applications/specs be a good way to organize and meaningfully compare audio formats in this article? Beyond my newbie abilities, FWIW.
Re: the assertion above that DTS and Dolby Digital are the only 5.1 audio formats- here are some other examples, all of which might belong in this article--
DSD- native format of SACD audio, both stereo and surround, it's fundamentally different from PCM formats, using a single-bit super-high sample rate approach. MLP- 'Meridian Lossless Packing', the compressed format used for DVD-audio hi-res stereo and surround, necessary to keep the data rate within DVD medium's capabilities.
Then there are the lossless Blue-Ray DVD audio formats that DTS and Dolby came up with. Some info on their specs and parameters would seem appropriate here, unless DVD-only audio formats are discussed elsewhere, in which case a link to that article belongs here.
CDA is not an audio file format
wav free and open?
Apple Lossless not in list
Apple Lossless is missing from the lists at the end of the articles. Should Apple Lossless be listed as free and open (like AIFF), open, proprietary? There are no references given to support any of these distinctions and some appear dubious: e.g., although there was an unofficial "MPEG 2.5" that was proprietary, MP3 is an ISO standard and there is nothing proprietary about it. AAC is also an ISO standard and is not proprietary. The wiki article on DCT says it is proprietary but it isn't listed as such. This division into open and proprietary categories is a mess. Ross Fraser (talk) 15:39, 10 March 2011 (UTC)
- I have WP:BOLDly combined all into one list. I've also added more prominent links to existing and better lists. Given the existence of those, I'm not convince we even need a list here. Feel free to add Apple lossless onto the list though. --Kvng (talk) 13:52, 12 March 2011 (UTC)
- Thanks, I've alphabetized the resulting list. I think it is still useful to draw a distinction between codecs and file formats so would suggest that the list is still useful. I've added ALAC.
Acoustic waves - Is "Lossless" a misnomer?
I would like a section discussing the fundamental transform from analog to digital, or a link to the article which discusses that best. I will research elsewhere, but the article could use some brief fundamentals and such a link if it exists. The topic is more linkworthy here than in many other articles. Mydogtrouble (talk) 20:43, 11 November 2012 (UTC)
- There's a link to digital audio in the lead. Another candidate is Sampling (signal processing). -—Kvng 14:09, 14 November 2012 (UTC)