Вырезать тишину из видеолекций. ffmpeg encoders etc.

#!/bin/bash

# === CONFIG ===
INPUT="$1"
OUTPUT="$2"
SILENCE_THRESHOLD="-35dB"     # Silence detection threshold
MIN_SILENCE_DURATION="0.2"    # Silence must be at least this long to be considered
MIN_SEGMENT_DURATION="0.1"    # Skip non-silent segments shorter than this

# === Get total duration of input video ===
DURATION_TOTAL=$(ffprobe -v error -show_entries format=duration \
    -of default=noprint_wrappers=1:nokey=1 "$INPUT")

# === Function to parse silencedetect log and print non-silent segments ===
get_non_silent_segments() {
    ffmpeg -hide_banner -i "$INPUT" \
        -af "silencedetect=noise=$SILENCE_THRESHOLD:d=$MIN_SILENCE_DURATION" \
        -f null - 2>&1 |
    awk -v total="$DURATION_TOTAL" '
    BEGIN {
        silence_start = 0;
        silence_end = 0;
    }
    /silence_start/ {
        silence_start = $NF;
        printf("%f %f %f\n", silence_end, silence_start, (silence_start - silence_end));
    }
    /silence_end/ {
        silence_end = $(NF-3);
    }
    END {
        printf("%f %f %f\n", silence_end, total, (total - silence_end));
    }'
}

# === Search for non-silent segments ===
echo "Searhing silent parts..." >&2
mapfile -t segments < <(get_non_silent_segments)

# === Main Processing Pipeline ===
{
    for line in "${segments[@]}"; do
        read start end duration <<< "$line"
        if (( $(echo "$duration >= $MIN_SEGMENT_DURATION" | bc -l) )); then
            echo "Extracting segment: $start to $end (duration $duration)" >&2
            ffmpeg -hide_banner -loglevel error \
                -i "$INPUT" -ss "$start" -t "$duration" \
                -c:a copy -c:v h264 -crf 22 -preset fast -f mpegts - 2>/dev/null
        else
            echo "Skipping short segment: $start to $end (duration $duration)" >&2
        fi
    done
} | ffmpeg -hide_banner -loglevel error -f mpegts -i - -c copy "$OUTPUT" -y

./sr.sh input.mp4 output.mp4