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#1
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Want WAV editor allows cutting without changing remaining audio
I have some WAV recordings that I would like to trim to remove extra
material at the beginning/end. I am looking for a wav file editor that will let me do simple edits like this, without changing the remaining audio. From cursory examination of the .WAV file format, I would have thought this was simple to do. Yet the programs I have tried so far (Audacity, Nero WAV editor) can't even manage the even simpler operations of Opening and saving a .WAV file, without changing the contents. i.e., If I open a .WAV file, do nothing to it, then save/export it with a new name, then compare the result to my original (fc /b), there are lots of changes reported (not just at the beginning of the file). (And each subsequent save/export produces yet a different variant of the file.) Are there portions of a .WAV file given over to garbage? If so, it would make life easier if the tool would repeat the same garbage consistently. (e.g. so that file compare routines could recognize when files are identical.) Is there generational information embedded in wav files? If so, are there comparison programs that will extract this information, or at least ignore it and tell you when the audio portions of two wav files are identical? Looking for something low cost or free. (Don't need lots of bells and whistles, just something simple and fast to do some basic operations.) Thank you Sorry, the e-mail address above is no longer valid, if you wish to respond by e-mail, please use zzxjoanw at hotmail period com. I will post a summary of relevant e-mail responses. |
#2
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wrote in message oups.com... i.e., If I open a .WAV file, do nothing to it, then save/export it with a new name, then compare the result to my original (fc /b), there are lots of changes reported (not just at the beginning of the file). (And each subsequent save/export produces yet a different variant of the file.) The .wav format specification allows some variability in the way data is stored; that is, the same audio data can be stored in different ways. Here's oe description and commentary on the spec http://www.borg.com/~jglatt/tech/wave.htm I guess each program will have its own methods of storing the data (eg, order of the .wav file components) Anyway, I tried what you suggested - I took an existing .wav file, created by a Tascam 788 recorder, and opened and saved it with Goldwave. The input and output files differed. I then opened the output file in Goldwave, and saved it as a second output fiole. The two output files were identical. Tim |
#3
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#4
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Norbert Hahn wrote:
wrote: I have some WAV recordings that I would like to trim to remove extra material at the beginning/end. I am looking for a wav file editor that will let me do simple edits like this, without changing the remaining audio. Most audio editors should allow to select a portion of the file and offer Save Highlighted Part. From cursory examination of the .WAV file format, I would have thought this was simple to do. Yet the programs I have tried so far (Audacity, Nero WAV editor) can't even manage the even simpler operations of Opening and saving a .WAV file, without changing the contents. i.e., If I open a .WAV file, do nothing to it, then save/export it with a new name, then compare the result to my original (fc /b), there are lots of changes reported (not just at the beginning of the file). (And each subsequent save/export produces yet a different variant of the file.) The problem lies with fc as it doesn't know anything about the structure of a wav file. It consists of several chunks, one of them is headed DATA. That's shouldn't change unless you change the music i.e. by deleting/inserting, changing the amplitude, EQ. Anything else ususally changes because the INFO chunk may contain the name of the program that stored the file. Even the header of the wave file will change because it stores the length of the file and the displacement of the next chunk. As the position of the chunks are not fixed, some program will store the DATA chunk before the INFO chunk while some other program will store INFO before DATA. Good point. There are .wav file comparison tools in CDEX and EAC (both free downloads) that do know about the structure of .wav files and report only differences that could be sonically relevant. |
#5
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Norbert Hahn wrote: wrote: From cursory examination of the .WAV file format, I would have thought this was simple to do. Yet the programs I have tried so far (Audacity, Nero WAV editor) can't even manage the even simpler operations of Opening and saving a .WAV file, without changing the contents. i.e., If I open a .WAV file, do nothing to it, then save/export it with a new name, then compare the result to my original (fc /b), there are lots of changes reported (not just at the beginning of the file). (And each subsequent save/export produces yet a different variant of the file.) The problem lies with fc as it doesn't know anything about the structure of a wav file. It consists of several chunks, one of them is headed DATA. That's shouldn't change unless you change the music i.e. by deleting/inserting, changing the amplitude, EQ. No, the programs are changing the audio data (not just the header). I have since confirmed this using a WAV editor. I inverted one of the files and then added it to one of the others. If the audio had been identical, this should have resulted in a .WAV file of all 0's. It doesn't. (I did this before I found out about the .WAV compare features mentioned by others in this thread.) So the programs (Audacity, Nero Wave Editor) are adding their own noise to the WAV files. -- In response to other messages - thanks for the pointers on WAV compare features, and for the suggestion of GoldWave. It doesn't seem to have this problem. |
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