View difference between Paste ID: xyQ1SEya and rEBwZGvQ
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#!/usr/bin/env zsh
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if [[ $1 -eq 0 ]] || ! [[ -f $2 ]]; then
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    echo "Usage: $0 limit_in_kb source_file"
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    exit 1
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fi
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((size_limit=$1*1024))
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mkvmerge --split timecodes:$(
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echo mkvmerge --split timecodes:$(
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    LANG=C mkvinfo -v -v $2 |
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    awk -F'[ ,()]+' '
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        !vtrack && /Track number:/ {t=$5}
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        !vtrack && /Track type: video at/ {vtrack=t}
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        $3!="SimpleBlock" || $4!="key" || $7!=vtrack {next}
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        $16-split_pos > '$size_limit' {printf("%s%s", comma, prev_time); comma=","; split_pos=prev_pos}
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        $16-split_pos > '$size_limit' {
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            printf("%s%s", comma, prev_time);
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#        ffprobe медленней на порядок, да и хуита выходит — время не совпадает, режет по следующим кадрам
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            comma=",";
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#        ffprobe -hide_banner -loglevel error $2 -show_frames -select_streams 0:v:0 -of csv |
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            # print (prev_pos-split_pos)/1024 > "/dev/stderr";
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#            awk -F, ' !$2 {next} $12-prev_pkt_pos>'$size_limit' { prev_pkt_pos=$12; printf("%s%d:%d:%f", comma, prev_kf/3600, prev_kf % 3600 / 60, prev_kf % 60); comma=","} {prev_kf=$9}'
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            split_pos=prev_pos-10240;  # 10kb for file header
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        }
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        {prev_time=$14; prev_pos=$16}'
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    ) $2 -o "${2:t:r}-split.${2:e}"
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du ${2:t:r}-split*.${2:e}