first commit

.gitignore

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+examples

README.md

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+# Video sharding
+
+An attemp at something weird...

reunite.sh

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+#!/bin/bash
+
+# usage : 
+# ./reunite.sh video-name.part1.mp4
+
+filename=$(basename -- "$1")
+extension="${filename##*.}"
+filename=$(echo "${filename%.*}" | sed -r 's/(.+)\.part[0-4]{1}$/\1/g')
+
+# Extract audio track from one of the parts
+
+ffmpeg -i $1 -acodec copy $filename.aac
+
+# Let's use more explicit names for manipulation
+
+mv $filename.part1.$extension even_odd.mp4
+mv $filename.part2.$extension even_even.mp4
+mv $filename.part3.$extension odd_odd.mp4
+mv $filename.part4.$extension odd_even.mp4
+
+# Rotate the 4 sub-videos clockwise in order to merge them
+
+ffmpeg -i even_odd.mp4 -vf "transpose=1" even_90cw_odd.mp4
+ffmpeg -i even_even.mp4 -vf "transpose=1" even_90cw_even.mp4
+
+ffmpeg -i odd_odd.mp4 -vf "transpose=1" odd_90cw_odd.mp4 
+ffmpeg -i odd_even.mp4 -vf "transpose=1" odd_90cw_even.mp4
+
+
+# Merge the 4 sub-videos into 2
+
+ffmpeg -i even_90cw_odd.mp4 -i even_90cw_even.mp4 -filter_complex "[0][1]vstack,il=l=i:c=i" even_90cw.mp4
+ffmpeg -i odd_90cw_odd.mp4 -i odd_90cw_even.mp4 -filter_complex "[0][1]vstack,il=l=i:c=i" odd_90cw.mp4
+
+# Rotate the 2 videos back counter-clockwise
+
+ffmpeg -i odd_90cw.mp4 -vf "transpose=2" odd.mp4
+ffmpeg -i even_90cw.mp4 -vf "transpose=2" even.mp4
+
+# Merge the 2 videos
+
+ffmpeg -i odd.mp4 -i even.mp4 -filter_complex "[0][1]vstack,il=l=i:c=i" $filename.merged_no_sound.mp4
+
+# Merge video with audio track
+
+ffmpeg -i $filename.aac -i $filename.merged_no_sound.mp4 $filename.merged.mp4
+
+# Remove manipulation files
+
+rm even_odd.mp4 even_even.mp4 odd_odd.mp4 odd_even.mp4 even_90cw_odd.mp4 even_90cw_even.mp4 odd_90cw_odd.mp4 odd_90cw_even.mp4 even_90cw.mp4 odd_90cw.mp4 odd.mp4 even.mp4 $filename.merged_no_sound.mp4 $filename.aac
+
+

shard.sh

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+#!/bin/bash
+
+# See : 
+# https://stackoverflow.com/questions/49955100/how-do-i-split-a-video-to-2-separate-files-for-odd-and-even-fields-using-ffmpeg
+# Et : 
+# https://korben.info/ffmpeg-pour-les-nuls.html
+
+
+# Split the 1 video in 2
+
+ffmpeg -i $1 -filter_complex "[0]il=l=d:c=d,split[o][e];[o]crop=iw:ih/2:0:0[odd];[e]crop=iw:ih/2:0:ih/2[even]" -map "[odd]" odd.mp4 -map "[even]" even.mp4
+
+
+# Rotate the 2 videos clockwise
+
+ffmpeg -i odd.mp4 -vf "transpose=1" odd_90cw.mp4
+ffmpeg -i even.mp4 -vf "transpose=1" even_90cw.mp4
+
+
+# Split each of the 2 videos in 2
+# We now have 4 videos
+
+ffmpeg -i odd_90cw.mp4 -filter_complex "[0]il=l=d:c=d,split[o][e];[o]crop=iw:ih/2:0:0[odd];[e]crop=iw:ih/2:0:ih/2[even]" -map "[odd]" odd_90cw_odd.mp4 -map "[even]" odd_90cw_even.mp4
+ffmpeg -i even_90cw.mp4 -filter_complex "[0]il=l=d:c=d,split[o][e];[o]crop=iw:ih/2:0:0[odd];[e]crop=iw:ih/2:0:ih/2[even]" -map "[odd]" even_90cw_odd.mp4 -map "[even]" even_90cw_even.mp4
+
+# Rotate these 4 video back to normal (counter-clockwise)
+
+ffmpeg -i even_90cw_odd.mp4 -vf "transpose=2" even_odd.mp4
+ffmpeg -i even_90cw_even.mp4 -vf "transpose=2" even_even.mp4
+ffmpeg -i odd_90cw_odd.mp4 -vf "transpose=2" odd_odd.mp4
+ffmpeg -i odd_90cw_even.mp4 -vf "transpose=2" odd_even.mp4
+
+# Get filename
+
+filename=$(basename -- "$1")
+extension="${filename##*.}"
+filename="${filename%.*}"
+
+# Extract audio from original file
+
+ffmpeg -i $1 -acodec copy $filename.aac
+
+# Merge audio track into each one of the 4 videos
+
+ffmpeg -i $filename.aac -i even_odd.mp4 $filename.part1.$extension
+ffmpeg -i $filename.aac -i even_even.mp4 $filename.part2.$extension
+ffmpeg -i $filename.aac -i odd_odd.mp4 $filename.part3.$extension
+ffmpeg -i $filename.aac -i odd_even.mp4 $filename.part4.$extension
+
+# Remove useless files
+
+rm odd.mp4 even.mp4 odd_90cw.mp4 even_90cw.mp4 even_90cw_odd.mp4 even_90cw_even.mp4 odd_90cw_odd.mp4 odd_90cw_even.mp4 even_odd.mp4 even_even.mp4 odd_odd.mp4 odd_even.mp4 $filename.aac
+