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...Uint32Array(256); for (let i = 256; i--;) { let char = i << 24; for (let j = 8; j--;) { char = char & mask ? polynomial ^ char << 1 : char << 1; } CRCTable[i] = char; } return CRCTable; } 22.11.2018, 17:43, "Vitaly Zdanevich" <zdanevich.vitaly at ya.ru>: > I faced with problem about CRC32 calculation, I see that lookup table is different here https://github.com/rillian/rogg/blob/master/rogg.c#L196 > end for example here > https://stackoverflow.com/a/18639975/1879101 - JS code on this page for buildi...

...mers of your files will face limitations similar to the ones you are facing if they want to do anything more with them. But before you go too far down the route of changing the serial numbers, can you tell us what software is producing Oggs with a hard-coded serial number to begin with? Vitaly Zdanevich wrote: > Thank you again for your help, now I am thinking about much simpler solution - because all my Oggs comes from the the one source looks like I can alter serial and crc32 at their hardcoded positions. Please see this screenshot https://giphy.com/gifs/9AIe7ksYBwiYQoLVv9/fullscreen with ser...

Yes, I found that serials of my Oggs is all zeros, thank you, I will try to alter serial. 15.11.2018, 19:39, "Ralph Giles" <giles at thaumas.net>: > On 2018-11-15 4:22 a.m., Vitaly Zdanevich wrote: > >>  Note: Stream 1 has serial number 0, which is legal but may cause problems with some tools. > > Note if *both* files have the same serial number, it's impossible to > find the points where they were concatentated by bisection, and most > tools will assume they...

On 2018-11-15 11:01 a.m., Vitaly Zdanevich wrote: > Maybe you know some existing code snippet or library for Javascript for altering serial and crc? I don't, sorry. > Just now I compiled your quick script to wasm but the size is 28K, > I think about simple correct solution for that case. If you strip out the fprintf()s for p...

...the first concatenated file, this file consists of multiple Oggs. So this is impossible to correctly concat Ogg with simple Javascript? 15.11.2018, 15:13, "Philipp Schafft" <phschafft at de.loewenfelsen.net>: > Good morning, > > On Thu, 2018-11-15 at 14:48 +0300, Vitaly Zdanevich wrote: >>  Good day, no answers in Google about that. I asked >>  https://stackoverflow.com/questions/53290693/how-to-alter-duration-of-ogg-with-js - in short I have Ogg Vorbis files on the client side (webapp) and I need to concatenate them in one file for downloading. I did concatenat...

Maybe you know some existing code snippet or library for Javascript for altering serial and crc? Just now I compiled your quick script to wasm but the size is 28K, I think about simple correct solution for that case. 15.11.2018, 21:15, "Vitaly Zdanevich" <zdanevich.vitaly at ya.ru>: > Yes, I found that serials of my Oggs is all zeros, thank you, I will try to alter serial. > > 15.11.2018, 19:39, "Ralph Giles" <giles at thaumas.net>: >>  On 2018-11-15 4:22 a.m., Vitaly Zdanevich wrote: >> >>>...

On 2018-11-16 7:02 a.m., Vitaly Zdanevich wrote: > AWS Polly produces Oggs with hardcoded serial numbers as zeros. Your earlier ogginfo post said the file was created by ffmpeg. There was a bug like this in ffmpeg, fixed in 2010. I hope they're not using an ffmpeg build that old! Or the low-quality 'vorbis' encoder includ...

...imitations similar > to the ones you are facing if they want to do anything more with them. > > But before you go too far down the route of changing the serial numbers, > can you tell us what software is producing Oggs with a hard-coded serial > number to begin with? > > Vitaly Zdanevich wrote: >>  Thank you again for your help, now I am thinking about much simpler solution - because all my Oggs comes from the the one source looks like I can alter serial and crc32 at their hardcoded positions. Please see this screenshot https://giphy.com/gifs/9AIe7ksYBwiYQoLVv9/fullscreen wit...

...imitations similar > to the ones you are facing if they want to do anything more with them. > > But before you go too far down the route of changing the serial numbers, > can you tell us what software is producing Oggs with a hard-coded serial > number to begin with? > > Vitaly Zdanevich wrote: >>  Thank you again for your help, now I am thinking about much simpler solution - because all my Oggs comes from the the one source looks like I can alter serial and crc32 at their hardcoded positions. Please see this screenshot https://giphy.com/gifs/9AIe7ksYBwiYQoLVv9/fullscreen wit...

Good afternoon, On Thu, 2018-11-15 at 15:22 +0300, Vitaly Zdanevich wrote: > Thank you, ogginfo returned: > ----- > Note: Stream 1 has serial number 0, which is legal but may cause problems with some tools. > New logical stream (#1, serial: 00000000): type vorbis > Vorbis headers parsed for stream 1, information follows... > Version: 0 > Vendor...

Good day, no answers in Google about that. I asked https://stackoverflow.com/questions/53290693/how-to-alter-duration-of-ogg-with-js - in short I have Ogg Vorbis files on the client side (webapp) and I need to concatenate them in one file for downloading. I did concatenation with this line of code: const blob = new Blob(listOfChunksBlobs, {'type': 'audio/ogg'}); And I play the

Good morning, On Thu, 2018-11-15 at 14:48 +0300, Vitaly Zdanevich wrote: > Good day, no answers in Google about that. I asked > https://stackoverflow.com/questions/53290693/how-to-alter-duration-of-ogg-with-js - in short I have Ogg Vorbis files on the client side (webapp) and I need to concatenate them in one file for downloading. I did concatenation with t...

On 2018-11-15 4:22 a.m., Vitaly Zdanevich wrote: > Note: Stream 1 has serial number 0, which is legal but may cause problems with some tools. Note if *both* files have the same serial number, it's impossible to find the points where they were concatentated by bisection, and most tools will assume they've found all the sectio...

...from what region I need to calculate crc32? And also as we can see on the screenshot above - changed two groups of numbers beside the serials - what is that? Thank you very much for help. 16.11.2018, 04:01, "Ralph Giles" <giles at thaumas.net>: > On 2018-11-15 11:01 a.m., Vitaly Zdanevich wrote: >>  Maybe you know some existing code snippet or library for Javascript for altering serial and crc? > > I don't, sorry. > >>  Just now I compiled your quick script to wasm but the size is 28K, > I think about simple correct solution for that case. > > If yo...

...about Opus too (a year ago). But maybe they have rationality behind identical headers for speech - because with random serials every speech file for the same text will have different hash. 16.11.2018, 20:02, "Ralph Giles" <giles at thaumas.net>: > On 2018-11-16 7:02 a.m., Vitaly Zdanevich wrote: >>  AWS Polly produces Oggs with hardcoded serial numbers as zeros. > > Your earlier ogginfo post said the file was created by ffmpeg. There was > a bug like this in ffmpeg, fixed in 2010. I hope they're not using an > ffmpeg build that old! Or the low-quality 'vorb...