12 lines
440 B
Plaintext
12 lines
440 B
Plaintext
make low-bitrate preview for finding cutpoints:
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ffmpeg -i src.m4a -acodec libvo_aacenc -ac 1 -ab 8k tmp.m4a
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convert to Matroska for faster editing:
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mkvmerge -o tmp.mka --split "timecodes:0:12:34,1:23:45,..." src.m4a
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merge cuts (we want the even-numbered files):
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mkvmerge -o tmp.mka `ls tmp-*[02468].mka | sed "s/^/+/;s/+\(.*\)-002.mka/\1-002.mka/"`
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put back into .m4a:
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mkvextract tracks tmp.mka 1:tmp.aac && MP4Box -add tmp.aac dest.m4a
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