= melt encoding sniplets

siehe auch https://www.mltframework.org/plugins/ConsumerAvformat/

== VOC export profile encoding profile
  * XML code for manually editing the mlt file
<code>
<consumer pix_fmt="yuv420p" rescale="bilinear" width="1920" aspect="1,77778" top_field_first="2" preset="medium" f="mp4" flags2="-dct8x8" g="13" maxrate="5000k" bufsize="8192k" threads="0" vcodec="libx264" progressive="1" real_time="-3" bf="2" ab="192k" target="/mnt/usb/lnp256_fade2b.mp4" vpre="medium" r="50" height="1080" minrate="100k " acodec="aac" deinterlace_method="yadif" crf="21" ar="48000" vprofile="main" movflags="+faststart" mlt_service="avformat"/>
</code>
  * if you want to endoder with Shotcut, add a new profile and paste the following options:
<code>
pix_fmt=yuv420p
rescale=bilinear
width=1920
aspect=1,77778
top_field_first=2
preset=medium
f=mp4
flags2=-dct8x8
g=13
maxrate=5000k
bufsize=8192k
threads=0
vcodec=libx264
progressive=1
real_time=-3
bf=2
ab=192k
vpre=medium
r=50
height=1080
minrate=100k
acodec=aac
deinterlace_method=yadif
crf=21
ar=48000
vprofile=main
movflags=+faststart
</code>

== group sniplets to uncut.mlt
<code>
melt -consumer xml babylon-2018-05-26_21-08-38-22834.ts babylon-2018-05-26_21-11-38-22834.ts > uncut.mlt
</code>


== dg50 encoding
Direkter encode aus den fuse-ts files
<code>
/home/voc/Shotcut.app/melt -progress -track \
 /video/datengarten/intros/50.ts \
/opt/crs/fuse/datengarten/hd-capture-2/50/uncut.ts in=1857 out=$((1*60*60*25+3*60*25+52*25)) \
/opt/crs/fuse/datengarten/hd-capture-2/50/uncut.ts in=$((1*60*60*25+18*60*25+2*25)) out=162370 \
 /video/datengarten/intros/outro.ts \
 -attach-track frei0r.hqdn3d \
 -consumer avformat:/video/datengarten/tmp/dg50-out3.mp4 f=mp4 acodec=aac ab=192k \
 vcodec=libx264 crf=20 vminrate=100k vmaxrate=5000k vpreset="medium" \
 movflags=+faststart bufsize=8192k pix_fmt=yuv420p threads=8
</code>

Reencode des fertigen hd.mp4 um die pause herauszuschneiden (pause 1:04:00 -> 1:18:11)
<code>
melt -progress \
 /video/datengarten/tmp/50-hd-camonly.mp4 in=0 out=96000 \
 /video/datengarten/tmp/50-hd-camonly.mp4 in=117275 \
 -consumer avformat:/home/voc/dg50-out.mp4 f=mp4 acodec=aac ab=192k vcodec=libx264 crf=20\
 bufsize=8192k minrate=100k maxrate=5000k vprofile=main vlevel=4.0 movflags=+faststart pix_fmt=yuv420p
</code>

== timvideo
<code>xvfb-run -a melt /encode-final/lca2014-intro.dv \
 -filter watermark:"/encode-tmp/gentilli/101/101-title.png" \
  in=300 out=500 composite.progressive=1 producer.align=centre composite.valign=c  composite.halign=c \
 /encode-tmp/gentilli/101/start-101.dv \
 /encode-tmp/gentilli/101/2014-01-09_15-42-23.dv \
 /encode-tmp/gentilli/101/2014-01-09_16-18-04.dv \
 /encode-tmp/getilli/101/2014-01-09_16-21-59.dv \
 /encode-fin1al/lca2014-exit.dv -consumer avformat
</code>

== channel mapping
  melt ./${file[$i]} $INOUT -profile pal -filter channelcopy to=1 from=0 \
  -consumer avformat:./${output[$i]}.webm progress=1 vb=1000k quality=good deadline=good \
  deinterlace=1 deinterlace_method=yadif

== shotcut/kdenlive project file rendern

mono mp4 z.B. Repair mit Backup Recording aus Kamera rendern:

  melt -progress -track --project 1005.mlt  -consumer avformat:./1005-cut.mp4 f=mp4 acodec=aac ab=192k channels=1 vcodec=libx264 crf=20 bufsize=8192k minrate=100k maxrate=5000k vprofile=main vlevel=4.0 movflags=+faststart pix_fmt=yuv420p

  
== melt transcode (fosdem)
<code bash>
#!/bin/bash
#
#        (c) 2013-2015 Holger Levsen         holger@layer-acht.org
#        GPL2 licenced

title[0]="Stretching out for trustworthy reproducible builds"
speaker[0]="Holger and Lunar"
file[0]="k1105_la_fontaine_a_31_142433.mp4"
begin_offset[0]="9385"
end_offset[0]="17913"


videos=1

for i in $(seq 0 $videos) ; do
	if [ -z "${file[$i]}" ] ; then 
		continue
	fi
	if [ -z "${speaker[$i]}" ] ; then 
		echo "${title[$i]} using ${file[$i]}"
		output[$i]=$(echo ${title[$i]} | sed -s "s# #_#g" )
	else	
		echo "${title[$i]} by ${speaker[$i]} using ${file[$i]}"
		output[$i]=$(echo ${title[$i]} by ${speaker[$i]} | sed -s "s# #_#g" )
	fi
	echo "                 -> ${output[$i]}"
	IN=""
	OUT=""
	# 25 frames per second
	if [ ! -z ${begin_offset[$i]} ] ; then
		IN="in=$(echo ${begin_offset[$i]}*25|bc)"
	fi
	if [ ! -z ${end_offset[$i]} ] ; then
		OUT="out=$(echo ${end_offset[$i]}*25|bc)"
	fi
	INOUT="$IN $OUT"
	echo $INOUT
	if [ ! -f ./${output[$i]}.webm ] ; then
		melt ./${file[$i]} $INOUT -profile pal -filter channelcopy to=1 from=0 \
		 -consumer avformat:./${output[$i]}.webm progress=1 vb=1000k quality=good \
		 deadline=good deinterlace=1 deinterlace_method=yadif
	fi
done
</code>