Changes between Version 6 and Version 7 of Encode/MP3
- Timestamp:
- Jan 27, 2014, 6:18:22 PM (12 years ago)
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Encode/MP3
v6 v7 22 22 || -V 9 || 65 || 45...85 || -q:a 9 23 23 24 In our example above, we selected `-qscale:a 2`, meaning we used LAME's option `-V 2`, which gives us a VBR MP3 audio stream with an average stereo bitrate of 170-210 kBit/s.24 In our example above, we selected `-qscale:a 2`, meaning we used LAME's option `-V 2`, which gives us a VBR MP3 audio stream with an average stereo bitrate of 170-210 kBit/s. 25 25 26 26 = CBR Encoding = … … 28 28 If you need constant bitrate (CBR) MP3 audio, you need to use the `-b:a` option instead of `-qscale:a`. Here you can specify the number of bits per second, for example `-b:a 256k` if you want 256 Kbit/s (25.6 KB/s) audio. 29 29 30 == Troubleshooting == 31 32 Sometimes it will give you *less* bits per second than you request. If you're doing CBR, it could be because you chose a value "in between" its allowable settings (if defaults down to the next lower). If you're doing VBR, it could be because the input itself is already in a lower bitrate than the requested, in which case, it basically just re-encodes it at the bitrate the input already was. 33 34 30 35 == Also see == 31 36 * [http://ffmpeg.org/ffmpeg-codecs.html#libmp3lame-1 FFmpeg Codecs Documentation for libmp3lame]
