init

2026-05-30 00:08:59 +05:00
commit d3afd698b6
52 changed files with 8150 additions and 0 deletions
@@ -0,0 +1,30 @@
+import sys
+p = sys.argv[1] if len(sys.argv) > 1 else '/tmp/cap.flv'
+d = open(p, 'rb').read()
+print('size', len(d))
+if d[:3] != b'FLV':
+    print('NOT FLV, first bytes:', d[:16].hex()); sys.exit(0)
+off = int.from_bytes(d[5:9], 'big')
+print('sig', d[:3], 'ver', d[3], 'flags', hex(d[4]), 'dataoffset', off)
+i = off + 4  # skip PrevTagSize0
+n = 0
+while i + 11 <= len(d) and n < 14:
+    ttype = d[i] & 0x1f
+    dsize = int.from_bytes(d[i+1:i+4], 'big')
+    body = d[i+11:i+11+dsize]
+    info = ''
+    if ttype == 9 and body:
+        b0 = body[0]; isEx = (b0 & 0x80) != 0
+        if isEx:
+            ft = (b0 >> 4) & 7; pt = b0 & 0xf; fourcc = bytes(body[1:5])
+            info = f'video EX frameType={ft} packetType={pt} fourcc={fourcc} head={body[:14].hex()}'
+        else:
+            cid = b0 & 0xf; ft = (b0 >> 4) & 0xf; avcpt = body[1] if len(body) > 1 else -1
+            info = f'video LEGACY codecId={cid} frameType={ft} avcPacketType={avcpt} head={body[:14].hex()}'
+    elif ttype == 18:
+        info = 'script/meta'
+    elif ttype == 8:
+        info = 'audio'
+    print(f'tag#{n} type={ttype} dsize={dsize} {info}')
+    i = i + 11 + dsize + 4
+    n += 1