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-rwxr-xr-xlocalvideowebencode44
1 files changed, 35 insertions, 9 deletions
diff --git a/localvideowebencode b/localvideowebencode
index d4670da..b225aac 100755
--- a/localvideowebencode
+++ b/localvideowebencode
@@ -31,6 +31,11 @@ Usage: $PRG [OPTION...] [--] [ARG=VALUE...] INPUTFILE... [ARG=VALUE...]
Encode video file in multiple web-optimized formats, and provide sample
html favoring open formats with optional non-JavaScript Flash fallback.
+ --video Video style:
+ ref-bpp
+ talkinghead 0.1
+ action 0.15
+ (default: none)
-p, --profile Video format - size with optional rate suffix,
delimited by @ (except for widescreen labels):
e.g. 848x480@25 480p25 wvga@25
@@ -51,8 +56,11 @@ html favoring open formats with optional non-JavaScript Flash fallback.
-r, --rate Video framerate - integer or fraction:
e.g. 15 1001/24000 25 1001/30000
(default: use input framerate)
- -b, --bitrate Video bitrate in bytes, with optional ISO suffix
- (default: none)
+ --refbpp Reference bits-per-pixel (relative to 360p30),
+ for computing average bitrate when not fixed.
+ (default: 0.12)
+ -b, --bitrate Fixed video bitrate in bytes: e.g. 768k 1M
+ (default: none - use variable bitrate)
--h264profile MPEG-4 AVC target profile: baseline main high
(default: baseline)
--h264preset MPEG-4 AVC target preset: slow ultrafast etc.
@@ -81,15 +89,12 @@ Examples:
Options before input files are passed to melt producer, and after to
melt avformat consumer.
-When video bitrate is set, 2-pass encoding is used for MPEG-4 output.
-
Hints:
* Use square-pixel max. 480 width (vga 480p) for widest compatibility.
* Use a modulus 16 profile (qvga vga 480p 720p) for best compression.
- * Set bitrate for optimal MPEG-4/WebM bits-per-pixel ratio:
- + talking head: 0.1
- + high-motion or detailed content: 0.15
- (inspect bits-per-pixel ratio with mediainfo)
+ * Try lower reference bits-per-pixel until visual quality is affected.
+ * Raise reference bits-per-pixel if needed, but no higher than 0.2.
+ (you can inspect actual bits-per-pixel and bitrate with mediainfo)
More info:
<http://camendesign.com/code/video_for_everybody>
@@ -110,7 +115,7 @@ exit1() {
h264profile=baseline
# parse cmdline options
-TEMP="`getopt -s sh -o hp:s:a:r:b:t: -l help,profile:,size:,aspect:,rate:,bitrate:,h264profile:,h264preset:,webmpreset:,audio:,stem:,title:,filter:,sample:: -n "$PRG" -- "$@"`" || exit1 "Internal getopt error."
+TEMP="`getopt -s sh -o hp:s:a:r:b:t: -l help,profile:,size:,aspect:,rate:,video:,refbpp:,bitrate:,h264profile:,h264preset:,webmpreset:,audio:,stem:,title:,filter:,sample:: -n "$PRG" -- "$@"`" || exit1 "Internal getopt error."
eval set -- "$TEMP"
while true ; do
case "$1" in
@@ -119,6 +124,8 @@ while true ; do
-s|--size) size="$2"; shift 2;;
-a|--aspect) aspect="$2"; shift 2;;
-r|--rate) framerate="$2"; shift 2;;
+ --video) video="$2"; shift 2;;
+ --refbpp) refbpp="$2"; shift 2;;
-b|--bitrate) bitrate_fixed="$2"; shift 2;;
--h264profile) h264profile="$2"; shift 2;;
--h264preset) h264preset="$2"; shift 2;;
@@ -241,6 +248,19 @@ done << EOF
$(mediainfo --Inform="Video;%Width% %Height% %FrameRate%" "$infile_first")
EOF
+case "$video" in
+ talkinghead)
+ refbpp="${refbpp:-0.1}"
+ ;;
+ action)
+ refbpp="${refbpp:-0.15}"
+ ;;
+ '')
+ refbpp="${refbpp:-0.12}"
+ ;;
+ *) exit1 "Unknown video style \"$video\".";;
+esac
+
case "$h264profile" in
baseline|main)
_melt_h264="properties=x264-medium-$h264profile ${h264preset:+-vpre=libx264-$h264preset}"
@@ -264,6 +284,12 @@ if [ -n "$_pixels" ] && [ $_pixels -ge $((1024*768)) ]; then
fi
bitrate="$bitrate_fixed"
+# compute average bitrate from reference bits-per-pixel and "power of .75"
+if [ -n "$_pixels" ] && [ -n "$_frames" ]; then
+ bitrate="${bitrate_fixed:-$(perl \
+ -E "say int( +(($_pixels/(640*360))**0.75" \
+ -E "*640*360*$_frames*${refbpp:-$refbpp_default}) )")}"
+fi
# default per-codec-channel bitrates
bitrate_vorbis=64