Simple bash script to help trim video files.

trim.sh

#!/usr/bin/env bash

# --- Flag parsing ---
SUBS=false
POSITIONAL=()

for arg in "$@"; do
    case "$arg" in
        --subs|-s) SUBS=true ;;
        *) POSITIONAL+=("$arg") ;;
    esac
done

INPUT="${POSITIONAL[0]}"

if [[ -z "$INPUT" || ! -f "$INPUT" ]]; then
    echo "Usage: $0 [--subs|-s] <input_file.mp4|mkv>"
    exit 1
fi

# --- Whisper check (only if --subs is set) ---
if [[ "$SUBS" == true ]]; then
    if ! command -v whisper &>/dev/null; then
        echo "Error: 'whisper' not found. Install it with:"
        echo "  pip install openai-whisper"
        exit 1
    fi
fi

BASENAME="${INPUT%.*}"
EXT="${INPUT##*.}"

echo "Input file: $INPUT"
[[ "$SUBS" == true ]] && echo "Subtitles: enabled"
echo ""
echo "Enter timestamps one by one (e.g. 01:02:14)."
echo "Press Enter with no input when done."
echo ""

generate_subs() {
    local FILE="$1"
    echo "  Generating subtitles for: $FILE"
    whisper "$FILE" --output_format srt --output_dir "$(dirname "$FILE")" &>/dev/null
    if [[ $? -eq 0 ]]; then
        echo "  ✓ Subtitles saved: ${FILE%.*}.srt"
    else
        echo "  ✗ Whisper failed for: $FILE"
    fi
}

PREV="00:00:00"
SEGMENT=1

while true; do
    read -rp "Segment $SEGMENT start: $PREV — end timestamp (or Enter to finish): " NEXT

    if [[ -z "$NEXT" ]]; then
        OUTPUT="${BASENAME}_segment$(printf '%02d' $SEGMENT).${EXT}"
        echo "  Exporting: $PREV → end  →  $OUTPUT"
        ffmpeg -loglevel error -i "$INPUT" \
            -ss "$PREV" \
            -c:v libx264 -crf 18 -preset fast \
            -c:a copy \
            "$OUTPUT"
        if [[ $? -eq 0 ]]; then
            echo "  ✓ Saved: $OUTPUT"
            [[ "$SUBS" == true ]] && generate_subs "$OUTPUT"
        else
            echo "  ✗ ffmpeg failed for segment $SEGMENT."
        fi
        echo "Done. $SEGMENT segment(s) exported."
        break
    fi

    # Basic format validation
    if ! [[ "$NEXT" =~ ^[0-9]{2}:[0-9]{2}:[0-9]{2}$ ]]; then
        echo "  Invalid format. Use HH:MM:SS (e.g. 01:02:14). Try again."
        continue
    fi

    OUTPUT="${BASENAME}_segment$(printf '%02d' $SEGMENT).${EXT}"

    echo "  Exporting: $PREV → $NEXT  →  $OUTPUT"

    ffmpeg -loglevel error -i "$INPUT" \
        -ss "$PREV" -to "$NEXT" \
        -c:v libx264 -crf 18 -preset fast \
        -c:a copy \
        "$OUTPUT"

    if [[ $? -eq 0 ]]; then
        echo "  ✓ Saved: $OUTPUT"
        [[ "$SUBS" == true ]] && generate_subs "$OUTPUT"
    else
        echo "  ✗ ffmpeg failed for segment $SEGMENT."
    fi

    PREV="$NEXT"
    ((SEGMENT++))
    echo ""
done