Changes between Version 67 and Version 68 of Encode/H.264


Ignore:
Timestamp:
Jul 30, 2018, 10:36:42 PM (5 months ago)
Author:
slhck
Comment:

note that -an can be used in first pass

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  • Encode/H.264

    v67 v68  
    120120* In pass 1, output to a null file descriptor, not an actual file. (This will generate a logfile that ffmpeg needs for the second pass.) 
    121121* In pass 1, you need to specify an output format (with `-f`) that matches the output format you will use in pass 2. 
    122 * In pass 1, specify the audio codec used in pass 2; in many cases, `-an` in pass 1 will not work. 
     122* In pass 1, you can leave audio out by specifying `-an`. 
    123123 
    124124For example: 
    125125 
    126126{{{ 
    127 ffmpeg -y -i input -c:v libx264 -b:v 2600k -pass 1 -c:a aac -b:a 128k -f mp4 /dev/null && \ 
     127ffmpeg -y -i input -c:v libx264 -b:v 2600k -pass 1 -an -f mp4 /dev/null && \ 
    128128ffmpeg -i input -c:v libx264 -b:v 2600k -pass 2 -c:a aac -b:a 128k output.mp4 
    129129}}}