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LAME & CPU usage

  • 02-07-2005 12:51am
    #1
    oscarBravo
    Technology & Internet Moderators Posts: 28,822 Mod ✭✭✭✭


    I could spend time determining this type of thing experimentally, but: does anyone know which LAME parameters will result in lowering the CPU usage? I'm looking for a tradeoff between bandwidth, quality and CPU usage.

    To explain: the quality needs to be good, but not CD: somewhat better than FM radio quality would be fine. Bandwidth is not an issue, so high bitrates are no problem. CPU is a bottleneck, because all this has to happen on a 600MHz processor. I'm encoding a live stream on the fly - I guess what I'm looking for is the equivalent of being able to encode a .wav file as quickly as possible.

    I'm looking for pointers as to correlations between, say, bitrate and CPU - will higher bitrates need more CPU? Is joint-stereo harder work than stereo? What's easiest - cbr? abr? vbr? If anyone totally groks LAME, I'd appreciate any help.

    Thanks!


Comments

  • #2
    Mutant_Fruit
    Closed Accounts Posts: 4,943 ✭✭✭Mutant_Fruit


    CBR at 320kbps (the max bitrate) should be easily reachable. Don't touch VBR with a 10ft barge pole though, its too slow on a 600mhz, you may not be able to encode at realtime safely.

    try the lame -alt-preset insane switch. or if you want something lower quality, lame --alt-preset INSERTBITRATEHERE (i.e. alt-preset 256)


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