Download mp4 from ts segments in Bash

download-video.sh

if [ -z "$1" ]; then
  echo "Uso: $0 <url_segmento_ts>"
  exit 1
fi

URL="$1"

# Directory temporanea
TMP_DIR="segments"
LIST_FILE="list.txt"
OUTPUT="output.mp4"

mkdir -p "$TMP_DIR"
rm -f "$LIST_FILE"

# Estrae base URL e filename
BASE_URL="${URL%/*}"
FILE_NAME="${URL##*/}"

# Estrae prefisso, numero segmento e suffisso
# Esempio: seg-24-v1-a1.ts -> PREFIX=seg- , NUMBER=24 , SUFFIX=-v1-a1.ts
if [[ $FILE_NAME =~ ^(seg-)([0-9]+)(-v1-a1\.ts)$ ]]; then
  PREFIX="${BASH_REMATCH[1]}"
  NUMBER="${BASH_REMATCH[2]}"
  SUFFIX="${BASH_REMATCH[3]}"
else
  echo "Nome file non compatibile con pattern seg-<num>-v1-a1.ts"
  exit 1
fi

PAD=${#NUMBER}
i=$((10#$NUMBER))

echo "Download segmenti da $i in poi..."

while true; do
  NUM=$(printf "%0*d" "$PAD" "$i")
  SEGMENT="${PREFIX}${NUM}${SUFFIX}"
  SEGMENT_URL="$BASE_URL/$SEGMENT"

  HTTP_CODE=$(curl -s -o "$TMP_DIR/$SEGMENT" -w "%{http_code}" "$SEGMENT_URL")

  if [ "$HTTP_CODE" != "200" ]; then
    rm -f "$TMP_DIR/$SEGMENT"
    break
  fi

  echo "Scaricato: $SEGMENT"
  echo "file '$TMP_DIR/$SEGMENT'" >> "$LIST_FILE"

  ((i++))
done

if [ ! -s "$LIST_FILE" ]; then
  echo "Nessun segmento trovato."
  exit 1
fi

echo "Unione segmenti in $OUTPUT..."
ffmpeg -y -f concat -safe 0 -i "$LIST_FILE" -c copy "$OUTPUT"

echo "Completato ✅"