88 lines
3.5 KiB
Bash
Executable File
88 lines
3.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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# compare_simple.sh file1.mp4 file2.mp4
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set -euo pipefail
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f1="${1:-}"; f2="${2:-}"
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if [[ -z "$f1" || -z "$f2" ]]; then
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echo "Usage: $0 <file1> <file2>" >&2
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exit 2
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fi
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for f in "$f1" "$f2"; do
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[[ -f "$f" ]] || { echo "Not found: $f" >&2; exit 2; }
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done
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probe() {
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local f="$1"
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# format props
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local size dur br
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size=$(stat -c%s "$f" 2>/dev/null || stat -f%z "$f")
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dur=$(ffprobe -v error -show_entries format=duration -of default=nw=1:nk=1 "$f" || echo "")
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br=$(ffprobe -v error -show_entries format=bit_rate -of default=nw=1:nk=1 "$f" || echo "")
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# first video stream
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local vcodec w h fps
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vcodec=$(ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=nw=1:nk=1 "$f" || echo "")
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w=$(ffprobe -v error -select_streams v:0 -show_entries stream=width -of default=nw=1:nk=1 "$f" || echo "")
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h=$(ffprobe -v error -select_streams v:0 -show_entries stream=height -of default=nw=1:nk=1 "$f" || echo "")
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# r_frame_rate like 24000/1001 → convert to float
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local rfr
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rfr=$(ffprobe -v error -select_streams v:0 -show_entries stream=r_frame_rate -of default=nw=1:nk=1 "$f" || echo "")
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if [[ "$rfr" == */* ]]; then
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fps=$(awk -v r="$rfr" 'BEGIN{split(r,a,"/"); if(a[2]==0) print 0; else printf "%.3f", a[1]/a[2]}')
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else
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fps=$(awk -v r="$rfr" 'BEGIN{printf "%.3f", r+0}')
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fi
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# audio summary (codec:channels@rate, semicolon-separated)
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local ainfo
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ainfo=$(ffprobe -v error -select_streams a -show_entries stream=codec_name,channels,sample_rate -of csv=p=0 "$f" \
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| awk -F, '{printf "%s:%s@%s", $1, $2, $3; if (NR!=0) printf "\n"}' \
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| paste -sd';' - || true)
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echo "$size|$dur|$br|$vcodec|${w}x${h}|$fps|$ainfo"
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}
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read -r s1 d1 br1 vc1 res1 fps1 a1 <<<"$(probe "$f1" | tr '|' ' ')"
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read -r s2 d2 br2 vc2 res2 fps2 a2 <<<"$(probe "$f2" | tr '|' ' ')"
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# helpers
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absdiff() { awk -v a="$1" -v b="$2" 'BEGIN{d=a-b; if(d<0)d=-d; print d}'; }
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pctdiff() { awk -v a="$1" -v b="$2" 'BEGIN{if(a==0&&b==0){print 0;exit} m=(a+b)/2; if(m==0){print 100;exit} d=a-b; if(d<0)d=-d; printf "%.2f", (d/m)*100 }'; }
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dur_diff=$(absdiff "${d1:-0}" "${d2:-0}")
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fps_diff=$(absdiff "${fps1:-0}" "${fps2:-0}")
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size_pct=$(pctdiff "${s1:-0}" "${s2:-0}")
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printf "File 1: %s\n" "$f1"
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printf " Size: %s bytes\n Duration: %.3fs\n Video: %s, %s, %.3f fps\n" "$s1" "${d1:-0}" "${vc1:-?}" "${res1:-?}" "${fps1:-0}"
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printf " Audio: %s\n" "${a1:-none}"
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printf "\n"
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printf "File 2: %s\n" "$f2"
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printf " Size: %s bytes\n Duration: %.3fs\n Video: %s, %s, %.3f fps\n" "$s2" "${d2:-0}" "${vc2:-?}" "${res2:-?}" "${fps2:-0}"
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printf " Audio: %s\n" "${a2:-none}"
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printf "\n"
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echo "Differences:"
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printf " Size delta: %s%%\n" "$size_pct"
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printf " Duration delta: %.3fs\n" "$dur_diff"
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printf " FPS delta: %.3f\n" "$fps_diff"
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printf " Resolution match: %s\n" "$([[ "$res1" == "$res2" ]] && echo yes || echo no)"
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printf " Video codec match: %s\n" "$([[ "$vc1" == "$vc2" ]] && echo yes || echo no)"
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printf " Audio tracks match: %s\n" "$([[ "$a1" == "$a2" ]] && echo yes || echo no)"
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echo
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# verdict heuristics
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likely="Different"
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# allow small tolerance on duration/fps
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dur_ok=$(awk -v d="$dur_diff" 'BEGIN{print (d<=1.0)?"1":"0"}')
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fps_ok=$(awk -v d="$fps_diff" 'BEGIN{print (d<=0.5)?"1":"0"}')
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if [[ "$res1" == "$res2" && "$dur_ok" == "1" && "$fps_ok" == "1" ]]; then
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likely="Likely same content (possibly different encode)"
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fi
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if [[ "$vc1" == "$vc2" && "$a1" == "$a2" && "$size_pct" == "0.00" ]]; then
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likely="Identical encode/container"
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fi
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echo "Verdict: $likely"
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