Converting FLAC audio files: Difference between revisions
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=== ffmpeg === | === ffmpeg === | ||
This is a command line utility which relies on the `libfdk_aac` library, which is a separate install. | This is a command line utility which relies on the `libfdk_aac` library, which is a separate install. See [[#Troubleshooting|troubleshooting]]. | ||
[https://trac.ffmpeg.org/wiki/Encode/AAC AAC encoding documentation] | [https://trac.ffmpeg.org/wiki/Encode/AAC AAC encoding documentation] | ||
Variable bit rate AAC files seem to come out smaller in size than constant bit rate files. | Variable bit rate AAC files seem to come out smaller in size than constant bit rate files. | ||
| Line 33: | Line 31: | ||
Wrap the `ffmpeg` command in a loop: | Wrap the `ffmpeg` command in a loop: | ||
< | <syntaxhighlight lang="bash"> | ||
$ for i in *.flac; do ffmpeg -i "$i" -c:a libfdk_aac | # using mac os's built-in aac library | ||
</pre> | $ for i in *.flac; do ffmpeg -i "$i" -c:a aac_at -vbr 3 -c:v copy "${i%.*}.m4a"; done | ||
# using libfdk_aac | |||
$ for i in *.flac; do ffmpeg -i "$i" -c:a libfdk_aac -vbr 3 -c:v copy "${i%.*}.m4a"; done | |||
</syntaxhighlight> | |||
==== Troubleshooting ==== | |||
===== "Could not find tag for codec h264 in stream #0" ===== | |||
AAC output files are 0 bytes after an error to the effect of `Could not find tag for codec h264 in stream #0`. | |||
Adding `-c:v copy` as a parameter to the `ffmpeg` command fixed this. | |||
===== "Unknown encoder 'libfdk_aac'" with Mac OS ===== | |||
Use Mac OS's built in codec (`aac_at`) instead: | |||
<syntaxhighlight lang="bash"> | |||
$ ffmpeg -i input.flac -c:a aac_at -vbr 3 output.m4a | |||
</syntaxhighlight> | |||
===== Message that variable bitrate not supported ===== | |||
Running `ffmpeg` with `libfdx_aac` results in the following warning: <pre>Note, the VBR setting is unsupported and only works with some parameter combinations</pre> | |||
Use Mac OS's built in codec (`aac_at`) instead: | |||
<syntaxhighlight lang="bash"> | |||
$ ffmpeg -i input.flac -c:a aac_at -vbr 3 output.m4a | |||
</syntaxhighlight> | |||
=== Audacity === | === Audacity === | ||
Latest revision as of 13:28, 4 November 2023
Mac OS[edit]
ffmpeg[edit]
This is a command line utility which relies on the libfdk_aac library, which is a separate install. See troubleshooting.
Variable bit rate AAC files seem to come out smaller in size than constant bit rate files.
Constant bit rate[edit]
With AAC, 128k is supposedly indistinguishable from CD quality.
$ ffmpeg -i input.flac -c:a libfdk_aac -b:a 128k output.m4a
Variable bit rate[edit]
A variable bit rate setting of 3 is supposedly indistinguishable from CD quality.
$ ffmpeg -i input.flac -c:a libfdk_aac -vbr 3 output.m4a
Batch conversion[edit]
Wrap the ffmpeg command in a loop:
# using mac os's built-in aac library
$ for i in *.flac; do ffmpeg -i "$i" -c:a aac_at -vbr 3 -c:v copy "${i%.*}.m4a"; done
# using libfdk_aac
$ for i in *.flac; do ffmpeg -i "$i" -c:a libfdk_aac -vbr 3 -c:v copy "${i%.*}.m4a"; done
Troubleshooting[edit]
"Could not find tag for codec h264 in stream #0"[edit]
AAC output files are 0 bytes after an error to the effect of Could not find tag for codec h264 in stream #0.
Adding -c:v copy as a parameter to the ffmpeg command fixed this.
"Unknown encoder 'libfdk_aac'" with Mac OS[edit]
Use Mac OS's built in codec (aac_at) instead:
$ ffmpeg -i input.flac -c:a aac_at -vbr 3 output.m4a
Message that variable bitrate not supported[edit]
Running ffmpeg with libfdx_aac results in the following warning:
Note, the VBR setting is unsupported and only works with some parameter combinations
Use Mac OS's built in codec (aac_at) instead:
$ ffmpeg -i input.flac -c:a aac_at -vbr 3 output.m4a
Audacity[edit]
- File > Chains > Apply Chain
- Select MP3 Conversion
- Click Apply to Files... button
- Navigate to directory containing FLAC files.
- Select FLAC files to convert.
- Conversion process will start automatically (default conversion rate is 320kps)
- mp3 files are deposited in a directory in the source directory named
cleaned
Other software options[edit]
- XLD - (X Lossless Decoder) This gets mentioned and recommended a lot
- xACT (does converting and splitting)
- dBpoweramp
ffmpeg(command line)
Windows[edit]
- AVS Audio Converter
- Drag the
.flacfiles into the files pane. - Settings
- Codec: mp3
- Channels: stereo
- Bitrate: 192kps
- Sample Rate: 44100 Hz
- Sample Size: 16 bit