71 lines
3.3 KiB
Markdown
71 lines
3.3 KiB
Markdown
# flacconv
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flacconv is a 100% POSIX and (hopefully) portable[^1] shell script that recursively converts directories of flac files to opus/mp3.
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with no flags, it recursively converts flac files in the specified directory (or directories) to opus with a bitrate of 128k, retaining all metadata and not deleting the original flac files
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it also has options for you to change the bitrate, use a variable quality for mp3, keep/remove metadata, and parallel processing
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## dependencies
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- Some implementation of a shell and [POSIX Utilities](https://pubs.opengroup.org/onlinepubs/9699919799/idx/utilities.html) (usually, this is GNU coreutils, which you probably have)
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- `mktemp -u` (again, probably have this already)
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- `flac` and `metaflac` (usually bundled together)
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- `lame` (only if encoding to mp3)
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- `opus-tools` (only if encoding to opus)
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- [`opustags`](https://github.com/fmang/opustags) (optional, to use the -e option)
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- `curl` (optional, for checking for updates)
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## usage
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```
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usage: flacconv [-huvVipe3] [-b BITRATE] [-l LEVEL] [-k KEYS] [-r KEYS] [-j THREADS] [--] <DIRECTORY...>
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flacconv recursively converts directories of flac files to opus/mp3
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DIRECTORY can be specified multiple times
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IF ENCODING TO MP3, -k AND -r WILL NOT WORK. the only metadata that will be kept is the following:
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TITLE, ARTIST, ALBUM, ALBUMARTIST, DATE, GENRE, TRACKNUMBER, COMMENT, and the cover picture
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(blame id3. just use opus)
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-h show script help
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-u check for updates
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-v verbose output (messy with multithreading)
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-V very verbose output (VERY messy, use only for debugging and with like, -j 1)
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-i ignore script-stopping warnings
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-d delete original flac files after transcoding
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-3 switch output filetype to mp3
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-b <BITRATE> output bitrate in kbits (default 128)
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this value is variable for opus & CBR for mp3
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-l <LEVEL> mp3 only: use specified mp3 variable quality (0-9). integer only
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OVERRIDES -b
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-k <KEYS> keep specified flac metadata KEYS in output file
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keys can be seen using metaflac --export-tags-to=- file.flac
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argument is a comma or pipe-separated list of keys, case-insensitive
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(i.e. -k "artist,title,albumartist,album,date")
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if both -k and -r are not present, all keys are kept.
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-r <KEYS> remove specified flac metadata KEYS in output file
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option argument is of the same format as -k
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if set to "ALL" (with capitalization), all keys are removed
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-p remove embedded picture in output files
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-e remove the "encoder" tag that automatically gets applied with opusenc
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(requires opustags)
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-j <THREADS> use the specified amount of threads for parallel processing
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if omitted, CPU core count will be used
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```
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## examples
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recursively convert a directory of flacs to opus 128k, removing the picture and ENCODER tags for every file
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`flacconv -p -e /path/to/dir`
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recursively convert the current directory to mp3 320k
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`flacconv -b 320 -3 .`
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recursively convert current directory to opus 160k, while removing any COMMENT or DESCRIPTION tags
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`flacconv -b 160 -r comment,description .`
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recursively convert current directory to mp3 v0, removing all pictures
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`flacconv -3 -l 0 -p .`
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[^1]: tested with dash, bash, and yash (set -o posixly-correct) on linux. further testing encouraged
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