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Subject: Re[2]: Video Converter Windows GUI

Re[2]: Video Converter Windows GUI

From: Uwe Freese <>
Date: Fri, 20 Feb 2004 12:53:46 +0100

Hello John,

John Wunder wrote on Friday, February 20, 2004, 2:12:00 AM:

JW> On Thu, 19 Feb 2004 15:29:49 +0100, Uwe Freese <> wrote:
>> Read the first Bytes. If the file starts with "RIFF", it's w WAV. You
>> can use StripHdr.exe (command line prog) from WinDac to strip off the
>> wav header, or do it yourself in with your GUI program (WAV header is
>> 48(?) bytes).

JW> Yeah, I'm replying to the same thing twice. Sue me. Anyway, both start
JW> with RIFF. Apparently avi2wav thinks it's extracting a wav so puts the
JW> wav header on it. So I tested it. Made 2 short clips of AVI, one with
JW> PCM audio and one with MP3 audio. Extracted both with avi2wav. Both had
JW> similar headers:
JW> WAV: RIFF~²' WAVEfmt   D¬ ±   dataX²'
JW> MP3: RIFF‚Ÿ WAVEfmt  U  "V X  ¶ qdataPŸ
JW> (In hex of course...this is just what I got in notepad cause I don't have
JW> a hex editor).

Ah, ok, MP3 with WAV header then.

The WAV header is 58 bytes long. Look at byte 59+60. If it starts with
11 "1" bits, it's the sync word of an mp3. Then you strip off the
first 58 bytes and feed this mp3 file into lame.

Bye, Uwe.

Received on 2004-02-20

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