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420 lines
13 KiB
Groff
420 lines
13 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "MP3VAL 1"
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.TH MP3VAL 1 "2014-09-22" "0.1.8" "SlackBuilds.org"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "MP3val 0.1.8: Documentation"
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.IX Header "MP3val 0.1.8: Documentation"
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.IP "1. Introduction" 4
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.IX Item "1. Introduction"
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.PD 0
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.IP "2. Why to use it?" 4
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.IX Item "2. Why to use it?"
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.IP "3. How to use it?" 4
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.IX Item "3. How to use it?"
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.IP "4. Interpreting the output" 4
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.IX Item "4. Interpreting the output"
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.IP "5. Licensing and copyright" 4
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.IX Item "5. Licensing and copyright"
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.PD
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.SS "1. Introduction."
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.IX Subsection "1. Introduction."
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MP3val is a small, high-speed tool for \s-1MPEG\s0 audio files validation and
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(optionally) fixing problems. It was primarily designed for
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verification of \s-1MPEG 1\s0 Layer \s-1III \s0(\s-1MP3\s0) files, but supports also other
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\&\s-1MPEG\s0 versions and layers. It can be useful for finding corrupted files
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(e.g. incompletely downloaded).
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.PP
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MP3val supports:
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.IP "\(bu" 4
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\&\s-1MPEG\-1, 2, 2.5\s0; Layers I, \s-1II, III\s0
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.IP "\(bu" 4
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ID3v1 tags (must be at the very end of the file)
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.IP "\(bu" 4
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ID3v2 tags (must be at the very beginning of the file)
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.IP "\(bu" 4
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APEv2 tags
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.PP
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This program can be compiled both for Windows and major Unix systems.
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.PP
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This program is free software; you can redistribute it and/or modify it
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under the terms of the \s-1GNU\s0 General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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.PP
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The latest version of MP3val (including sources) can be downloaded from
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the official home page.
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.SS "2. Why to use it?"
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.IX Subsection "2. Why to use it?"
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\&\s-1MPEG\s0 is a streamable format, that is, it is optimized for quick and
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easy recovery from errors. \s-1MP3\s0 decoders are very tolerant to
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inconsistencies in the input file. Most players even don't report to
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user about stream errors. So, as a rule, user doesn't know whether his
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files are valid or broken. But using broken files can eventually lead
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to problems during playback on certain software/hardware.
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.PP
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MP3val can assure you that your files are consistent in the terms of
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\&\s-1MPEG\s0 frames, that is, it ensures that the file can be easily split into
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the frames and doesn't contain garbage. It checks also some other
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issues, such as track length stored in the \s-1VBR\s0 header. Checking by
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MP3val isn't a full test for compliance with existing formal and
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informal standards. MP3val neither decodes audio data nor checks for
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data validity in the frame.
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.PP
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MP3val can also fix most of the problems. Be careful: although MP3val
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can repair even files with \s-1MPEG\s0 stream errors, it is recommended that
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you find a \*(L"good\*(R" copy of this file, because a \*(L"click\*(R" sound usually
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can't be removed, the repaired file will only look like good.
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.SS "3. How to use it?"
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.IX Subsection "3. How to use it?"
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MP3val is a console program. Command-line syntax:
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.PP
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.Vb 1
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\& mp3val <files to validate> <options>
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.Ve
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.PP
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\&\fI<files to validate>\fR \- \s-1MPEG\s0 audio file(s) name(s). Can
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contain wildcards.
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.PP
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\&\fIOptions\fR:
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.PP
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\&\fBOption\fR
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.PP
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\&\fBDescription\fR
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.PP
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\&\-l\fI<log file>\fR
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.PP
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Log file name. If this argument is missing, all the information will be
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written to stdout.
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.PP
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\&\-f
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.PP
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Try to fix errors.
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.PP
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\&\-si
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.PP
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Suppress \s-1INFO\s0 messages.
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.PP
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\&\-nb
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.PP
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Delete .bak files that were created during file rebuilding. Use this
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option together with \-f.
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.PP
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\&\-t
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.PP
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Keep file timestamps. Use this option together with \-f.
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.PP
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\&\-p
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.PP
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Pipe mode (receive input file names from stdin). Intended for
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interaction with frontends. \fI<files to validate>\fR is ignored
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in this case.
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.PP
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\&\-v
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.PP
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Print version and exit
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.PP
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Example:
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.PP
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.Vb 1
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\& mp3val my_song.mp3 \-lout.log \-f
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.Ve
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.PP
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MP3val will give information about the file with the name specified.
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Any errors or inconsistencies will result in a \*(L"\s-1WARNING\*(R"\s0 message. This
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doesn't necessarily mean that the file is corrupted. See the next
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section for details. If the file doesn't look like a \s-1MPEG\s0 audio file,
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an \fI\*(L"\s-1ERROR:\s0 invalid file format\*(R"\fR message will be generated.
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.SS "4. Interpreting the output."
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.IX Subsection "4. Interpreting the output."
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\&\fB\s-1WARNING\s0 message\fR
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.PP
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\&\fBFixable?\fR
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.PP
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\&\fBComments\fR
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.PP
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\&\fIToo few \s-1MPEG\s0 frames (it's unlikely that this is a \s-1MPEG\s0 audio file)\fR
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.PP
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\&\-
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.PP
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Probably this is not a \s-1MPEG\s0 audio file, but MP3val has detected a
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couple of \s-1MPEG\s0 frames in it. Most likely this is a false positive.
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.PP
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\&\fIGarbage at the beginning of the file\fR
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.PP
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+
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.PP
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There are some unknown data at the beginning of the file (before the
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first \s-1MPEG\s0 frame). It can be an unsupported tag with metadata, but in
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most cases it is only garbage. \*(L"Fixing\*(R" means here a removal of these
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data.
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.PP
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\&\fIGarbage at the end of the file\fR
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.PP
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+
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.PP
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Like previous.
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.PP
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\&\fI\s-1MPEG\s0 stream error, resynchronized successfully\fR
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.PP
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+
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.PP
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Normally, each \s-1MPEG\s0 frame must be followed by a next \s-1MPEG\s0 frame (or a
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metadata block), otherwise this message is generated. \s-1MPEG\s0 stream
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errors can be caused by garbage in the middle of the file (e.g. the
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file was split into several parts, the tags were appended, and then
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these parts were improperly merged) or by a data loss during transfer
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or storage. Note that \*(L"fixing\*(R" this error will remove garbage, but in
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most cases \*(L"fixed\*(R" file will not sound better, that's why it is
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strongly recommended to find a \*(L"good\*(R" copy of the file.
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.PP
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\&\fIThis is a \s-1RIFF\s0 file, not \s-1MPEG\s0 stream\fR
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.PP
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+
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.PP
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A common way for storing a \s-1MPEG\s0 audio file is simply to write \s-1MPEG\s0
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frames one-by-one. \s-1MP1/MP2/MP3\s0 files are organized so. \s-1MPEG\s0 audio data
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can also be encapsulated in the \s-1RIFF\s0 container (better known as \s-1WAV\s0
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file). The \s-1RIFF\s0 container shouldn't be used unless the file has \*(L"\s-1WAV\*(R"\s0
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extension.
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.PP
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\&\fIIt seems that file is truncated or there is garbage at the end of the
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file\fR
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.PP
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+
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.PP
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This message is generated when the length of the last frame (according
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to its header) is greater than the amount of data from its beginning to
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the end of the file. As a rule, it means that the file was truncated,
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however, there can be garbage at its end. \*(L"Fixing\*(R" means here a removal
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of the last frame.
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.PP
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\&\fIWrong number of \s-1MPEG\s0 frames specified in Xing header\fR
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.PP
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+
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.PP
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\&\s-1MPEG\s0 audio files don't have any special header, each frame has its own
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header instead. However, it can cause problems when \*(L"seeking\*(R" in
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variable bitrate files, because a decoder can't determine the exact
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place in the file corresponding to the selected time. That's why a \*(L"\s-1VBR\s0
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header\*(R" is sometimes included in the first \s-1MPEG\s0 frame. This message is
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generated if this header contains false information about the total
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number of \s-1MPEG\s0 frames.
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.PP
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\&\fIWrong number of \s-1MPEG\s0 data bytes specified in Xing header\fR
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.PP
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+
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.PP
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This message is generated when the Xing header contains false
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information about the total size of \s-1MPEG\s0 data in the file. See the
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previous message.
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.PP
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\&\fIWrong number of \s-1MPEG\s0 frames specified in \s-1VBRI\s0 header\fR
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.PP
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+
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.PP
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|
Like with Xing header. \s-1VBRI\s0 is the other way to store \s-1VBR\s0 information
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in the first \s-1MPEG\s0 frame, but it seems to be used much more rarely.
|
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.PP
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|
\&\fIWrong number of \s-1MPEG\s0 data bytes specified in \s-1VBRI\s0 header\fR
|
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.PP
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+
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.PP
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|
Like with Xing header. \s-1VBRI\s0 is the other way to store \s-1VBR\s0 information
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in the first \s-1MPEG\s0 frame, but it seems to be used much more rarely.
|
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.PP
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|
\&\fI\s-1VBR\s0 detected, but no \s-1VBR\s0 header is present. Seeking may not work
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properly\fR
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.PP
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\&\-
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.PP
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|
Files encoded with \s-1VBR\s0 should have a \s-1VBR\s0 header (either Xing or \s-1VBRI\s0),
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otherwise seeking can be broken. This will be fixable in the future
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|
versions.
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.PP
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\&\fIWrong \s-1CRC\s0 in ... frames\fR
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.PP
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+
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.PP
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Some frames in the file are protected by \s-1CRC,\s0 but the checksum is
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wrong. It means that either the file was encoded or processed by broken
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software, or it was broken during storage or transmission. MP3val
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reports a number of frames with incorrect \s-1CRC,\s0 which can be used as a
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hint (if this number equals or is about the total number of frames,
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then it's likely due to a bad encoder). Note that only a minority of
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files is protected by \s-1CRC.\s0
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.PP
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\&\fINon-layer-III frame encountered\fR
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.PP
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\&\-
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.PP
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MP3val was primarily designed for \s-1MP3\s0 files. That's why it warns about
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\&\s-1MPEG\s0 frames with layers other than \s-1III.\s0 If it is an \s-1MP2\s0 or \s-1MP1\s0 file,
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this warning should be ignored. If you want to fix this issue, you
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should reencode the file.
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.PP
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\&\fIDifferent \s-1MPEG\s0 versions or layers in one file\fR
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.PP
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\&\-
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.PP
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|
Mixing different \s-1MPEG\s0 versions and/or layers in one file is not very
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good. As in the previous case, this issue can be fixed only by
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reencoding.
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.PP
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\&\fISeveral APEv2 tags in one file\fR
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.PP
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+
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.PP
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Normally there would be only one APEv2 tag in the file.
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.PP
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\&\fINo supported tags in the file\fR
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.PP
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\&\-
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.PP
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This is only a warning. It's a good practice to store metadata in tags.
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.SS "5. Licensing and copyright"
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|
.IX Subsection "5. Licensing and copyright"
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|
Copyright (c) 2005\-2009 by Alexey Kuznetsov (ring0) and Eugen Tikhonov
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(jetsys).
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.PP
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This program is free software; you can redistribute it and/or modify it
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under the terms of the \s-1GNU\s0 General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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.PP
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Contacts: mp3val at ring0 dot pp dot ru
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