Changes between Version 18 and Version 19 of Encode/H.264


Ignore:
Timestamp:
Sep 6, 2012, 7:11:43 PM (6 years ago)
Author:
rogerdpack
Comment:

tweak layout

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  • Encode/H.264

    v18 v19  
    116116libx264 offer a "-tune zerolatency" option see See the [[StreamingGuide]]. 
    117117 
    118 == Pre-testing your settings == 
     118=== Pre-testing your settings === 
    119119Encode a random section instead of the whole video with the `-ss` and `-t` options to quickly get a general idea of what the output will look like. 
    120120* `-ss`: Offset time from beginning. Value can be in seconds or HH:MM:SS format. 
     
    124124 
    125125== FAQ == 
     126 
    126127=== Will two-pass provide a better quality than CRF? === 
    127128[http://doom10.org/index.php?PHPSESSID=okj08qe73ictdtv532augv8nu7&topic=267.msg2071#msg2071 No], though it does allow you to target a file size accurately. 
    128129 
    129130=== Why is `placebo` a waste of time? === 
     131 
    130132It helps at most ~1% compared to the `veryslow` preset at the cost of a much higher encoding time. It's diminishing returns: `veryslow` helps about 3% compared to the `slower` preset, `slower` helps about 5% compared to the `slow` preset, and `slow` helps about 5-10% compared to the `medium` preset. 
    131133 
    132134=== Why doesn't my lossless output look lossless? === 
    133 Blame the rgb->yuv conversion.  Though if you convert to yuv422p, it should still be lossless (which is the default now). 
     135 
     136Blame the rgb->yuv conversion.  If you convert to yuv422p, it should still be lossless (which is the default now). 
    134137 
    135138=== Will a graphics card make x264 encode faster? === 
    136 No. There are some proprietary encoders that utilize the GPU, but that does not mean they are very good or well optimized; and they're still [http://phoronix.com/forums/showthread.php?50697-Test-tool-for-snb-h264-encoder-in-libva-git&p=205580#post205580 slower than x264] anyway. 
    137139 
     140No. There are some proprietary encoders that utilize the GPU, but that does not mean they are very good or well optimized; and they might be [http://phoronix.com/forums/showthread.php?50697-Test-tool-for-snb-h264-encoder-in-libva-git&p=205580#post205580 slower than x264] anyway.