Comments on: FFMPEG Settings for Optimal Flash H264 Encoding http://www.ostalks.com/2009/12/09/ffmpeg-settings-for-optimal-flash-h264-encoding/ Open Source, Operating Systems, Offtopic Stuff! Wed, 01 Feb 2012 06:36:59 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: flashtastic http://www.ostalks.com/2009/12/09/ffmpeg-settings-for-optimal-flash-h264-encoding/comment-page-1/#comment-43 flashtastic Thu, 04 Mar 2010 19:13:34 +0000 http://www.ostalks.com/?p=176#comment-43 After much experimentation, this worked really great! Thanks! After much experimentation, this worked really great! Thanks!

]]> By: Abid Hussain http://www.ostalks.com/2009/12/09/ffmpeg-settings-for-optimal-flash-h264-encoding/comment-page-1/#comment-42 Abid Hussain Tue, 23 Feb 2010 06:50:57 +0000 http://www.ostalks.com/?p=176#comment-42 Thanks mate, your command work really great with me too. Thanks mate, your command work really great with me too.

]]> By: clintcan http://www.ostalks.com/2009/12/09/ffmpeg-settings-for-optimal-flash-h264-encoding/comment-page-1/#comment-39 clintcan Wed, 17 Feb 2010 08:46:52 +0000 http://www.ostalks.com/?p=176#comment-39 Hey, nice one Kaizoku. :D. Hey, nice one Kaizoku. :D .

]]> By: Kaizoku http://www.ostalks.com/2009/12/09/ffmpeg-settings-for-optimal-flash-h264-encoding/comment-page-1/#comment-38 Kaizoku Wed, 17 Feb 2010 08:39:59 +0000 http://www.ostalks.com/?p=176#comment-38 Forgot to add the t variable is what you want your target height is, mine is set to 432. t=432 Forgot to add the t variable is what you want your target height is, mine is set to 432.

t=432

]]> By: Kaizoku http://www.ostalks.com/2009/12/09/ffmpeg-settings-for-optimal-flash-h264-encoding/comment-page-1/#comment-37 Kaizoku Wed, 17 Feb 2010 08:37:57 +0000 http://www.ostalks.com/?p=176#comment-37 Very neat, just what I was looking for :) To have filesize down even further, why not resize the video. ffmpeg doesn't have built in scale caluculation, so we have to do it manually. #!/bin/bash # get original dimensions dm=$(ffmpeg -i "${1}" 2>&1 | grep Video | cut -d ' ' -f 10) # put the width in a variable ow=$(echo ${dm} | cut -d 'x' -f 1) # put the height in a variable oh=$(echo ${dm} | cut -d 'x' -f 2) # calculate the width to proportion of height and make sure its divisible by 16 width=$(echo ${t}*${ow}/${oh}/16*16 | bc) # run the encode ffmpeg -i "${1}" -vcodec libx264 -r 25 -s ${width}x${t} -crf 28 -threads 0 -flags +loop -cmp +chroma -deblockalpha -1 -deblockbeta -1 -refs 3 -bf 3 -coder 1 -me_method hex -me_range 18 -subq 7 -partitions +parti4x4+parti8x8+partp8x8+partb8x8 -g 320 -keyint_min 25 -level 41 -qmin 10 -qmax 51 -qcomp 0.7 -trellis 1 -sc_threshold 40 -i_qfactor 0.71 -flags2 +mixed_refs+dct8x8+wpred+bpyramid -acodec libfaac -ar 44100 -ab 64k -ac 2 "${output}" Very neat, just what I was looking for :)

To have filesize down even further, why not resize the video. ffmpeg doesn’t have built in scale caluculation, so we have to do it manually.

#!/bin/bash
# get original dimensions
dm=$(ffmpeg -i “${1}” 2>&1 | grep Video | cut -d ‘ ‘ -f 10)
# put the width in a variable
ow=$(echo ${dm} | cut -d ‘x’ -f 1)
# put the height in a variable
oh=$(echo ${dm} | cut -d ‘x’ -f 2)
# calculate the width to proportion of height and make sure its divisible by 16
width=$(echo ${t}*${ow}/${oh}/16*16 | bc)
# run the encode
ffmpeg -i “${1}” -vcodec libx264 -r 25 -s ${width}x${t} -crf 28 -threads 0 -flags +loop -cmp +chroma -deblockalpha -1 -deblockbeta -1 -refs 3 -bf 3 -coder 1 -me_method hex -me_range 18 -subq 7 -partitions +parti4x4+parti8x8+partp8x8+partb8x8 -g 320 -keyint_min 25 -level 41 -qmin 10 -qmax 51 -qcomp 0.7 -trellis 1 -sc_threshold 40 -i_qfactor 0.71 -flags2 +mixed_refs+dct8x8+wpred+bpyramid -acodec libfaac -ar 44100 -ab 64k -ac 2 “${output}”

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