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Lavf VS LibFLAC
fehers
post Nov 15 2012, 20:50
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Okay i converted .m4a file to .flac using FFMPEG like...

ffmpeg -i filename.m4a filename.flac

Using spectro analizer to see the file I noticed the one converted with ffmpeg has compression type of "Lavf54.36.100" while all the others on my computer downloaded from different sources have "LibFLAC 1.2.1". I checked this with at least 20 different flac files from different albums and sources. So my question is what is this "Lavf54.36.100" when all other I checked have "LibFLAC 1.2.1"?

Screenshots here!
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saratoga
post Nov 15 2012, 20:54
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Lavf is part of ffmpeg, so that tag means you've encoded the file with ffmpeg.
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fehers
post Nov 16 2012, 00:48
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QUOTE (saratoga @ Nov 15 2012, 20:54) *
Lavf is part of ffmpeg, so that tag means you've encoded the file with ffmpeg.


IC! So it's kinda like a "signature" of the software trough which the file was created and not the encoder version itself or something like that... Thanks!
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saratoga
post Nov 16 2012, 00:54
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QUOTE (fehers @ Nov 15 2012, 19:48) *
QUOTE (saratoga @ Nov 15 2012, 20:54) *
Lavf is part of ffmpeg, so that tag means you've encoded the file with ffmpeg.


IC! So it's kinda like a "signature" of the software trough which the file was created and not the encoder version itself or something like that...


No, its the version and name of the encoder used.
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fehers
post Nov 16 2012, 01:29
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QUOTE (saratoga @ Nov 16 2012, 00:54) *
No, its the version and name of the encoder used.



Then I don't get it! You say "that tag means you've encoded the file with ffmpeg". Yes, with ffmpeg but I'm assuming ffmpeg is using the "FLAC sources" to do that and not just any codec...

The file with the info "Lavf54.36.100" I'm talking about has a .flac extension...

This post has been edited by fehers: Nov 16 2012, 01:49
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Heliologue
post Nov 16 2012, 03:41
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QUOTE (fehers @ Nov 15 2012, 19:29) *
The file with the info "Lavf54.36.100" I'm talking about has a .flac extension...


The term "FLAC" is commonly used both for the file format (a lossless audio codec) and the compression program itself. An easy way to think about it is to compare it to ZIP files. Whether they're made with WinZip, WinRAR, InfoZip, 7-Zip, etc, they all create the same file format.

Both libFLAC and ffmpeg (and FLACCL and &c.) create files that follow the FLAC specification. This means (A) the files are lossless compressions of the source file and (B) they can be decoded by any decompressor that adheres to the standard.
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