diff options
Diffstat (limited to 'bin/capture+encode+serve')
| -rwxr-xr-x | bin/capture+encode+serve | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/bin/capture+encode+serve b/bin/capture+encode+serve index 26c5f40..9c78374 100755 --- a/bin/capture+encode+serve +++ b/bin/capture+encode+serve @@ -43,51 +43,61 @@ chomp @ADEVICES; #use Data::Dump; die dd @ADEVICES; -my $HEIGHT = 240; +my $HEIGHT = 288; my $FRAMERATE = 25; my $AUDIORATE = 48000; -# * height steps and bitrates based on https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html +my $RATIO_NUM = 4; +my $RATIO_DEN = 3; + +# * bitrates and bits in parens based on https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html +# + bits rounded up to include nearby modulo 16 formats +# + best (i.e. high-modulo) 16:9 heights: 216 288 360 432 576 720 +# + best (i.e. high-modulo) 4:3 heights: 288 312 384 480 624 816 # * speeds tuned to just below 100% cpu usage for each combination on a multi-core computer -# TODO: adjust height steps or bitrates for 4:3 aspect ratio -# TODO: resolve steps from source height using http://aarmstrong.org/tutorials/aspect-ratios-and-h264 # TODO: Externalize speeds to site-specific configfile -my ( $VBITRATE, $SPEED_X264, $SPEED_X264_ALONE ); -if ( $HEIGHT le 234 ) { +my ( $VBITRATE, $SPEED_X264, $SPEED_X264_ALONE, $SPEED_VP8, + $SPEED_VP8_ALONE ); +$RATIO_NUM ||= 16; +$RATIO_DEN ||= 9; +my $WIDTH ||= $HEIGHT * $RATIO_NUM / $RATIO_DEN; +$BITS = $WIDTH * $HEIGHT; + +if ( $BITS le 110592 ) { # 234p → 97344 $VBITRATE = 145000; $SPEED_X264 = 'fast'; $SPEED_X264_ALONE = 'fast'; $SPEED_VP8 = 3; $SPEED_VP8_ALONE = 2; } -elsif ( $HEIGHT le 270 ) { +elsif ( $BITS le 150528 ) { # 270p → 129600 $VBITRATE = 365000; $SPEED_X264 = 'faster'; $SPEED_X264_ALONE = 'fast'; $SPEED_VP8 = 4; $SPEED_VP8_ALONE = 2; } -elsif ( $HEIGHT le 360 ) { +elsif ( $BITS le 196608 ) { # 360p → 172800 $VBITRATE = 730000; $SPEED_X264 = 'veryfast'; $SPEED_X264_ALONE = 'fast'; $SPEED_VP8 = 5; $SPEED_VP8_ALONE = 3; } -elsif ( $HEIGHT le 432 ) { +elsif ( $BITS le 331776 ) { # 432p → 331776 $VBITRATE = 1100000; $SPEED_X264 = 'ultrafast'; $SPEED_X264_ALONE = 'fast'; $SPEED_VP8 = 8; $SPEED_VP8_ALONE = 4; } -elsif ( $HEIGHT le 540 ) { +elsif ( $BITS le 589824 ) { # 540p → 518400 $VBITRATE = 2000000; $SPEED_X264 = 'toofast'; $SPEED_X264_ALONE = 'veryfast'; $SPEED_VP8_ALONE = 5; } -elsif ( $HEIGHT le 720 ) { +elsif ( $BITS le 921600 ) { # 720p → 921600 $VBITRATE = 3000000; $SPEED_X264 = 'toofast'; $SPEED_X264_ALONE = 'ultrafast'; |