Commit 4611078b40 for ffmpeg

commit 4611078b40931f0a42056f78b9e37d02f905b881
Author: James Almer <jamrial@gmail.com>
Date:   Wed Oct 28 14:58:07 2026 -0300

    avcodec/lcevc_parser: handle four byte long start codes

    Start codes can be 0x000001 or 0x00000001, but lcevc_find_frame_end() was
    only looking for the former. This resulted in a stray zero being included in
    the following packet.

    Signed-off-by: James Almer <jamrial@gmail.com>

diff --git a/libavcodec/lcevc_parser.c b/libavcodec/lcevc_parser.c
index d3d6c38bd3..6a49cf29de 100644
--- a/libavcodec/lcevc_parser.c
+++ b/libavcodec/lcevc_parser.c
@@ -52,12 +52,12 @@ static int lcevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
     for (int i = 0; i < buf_size; i++) {
         int nut;

-        pc->state = (pc->state << 8) | buf[i];
+        pc->state64 = (pc->state64 << 8) | buf[i];

-        if (((pc->state >> 8) & 0xFFFFFF) != START_CODE)
+        if (((pc->state64 >> 24) & 0xFFFFFF) != START_CODE)
             continue;

-        nut = (pc->state >> 1) & 0x1F;
+        nut = (pc->state64 >> 17) & 0x1F;

         // Beginning of access unit
         if (nut == LCEVC_IDR_NUT || nut == LCEVC_NON_IDR_NUT) {
@@ -65,7 +65,7 @@ static int lcevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
                 pc->frame_start_found = 1;
             else {
                 pc->frame_start_found = 0;
-                return i - 3;
+                return i - (5 + !((pc->state64 >> 48) & 0xFF));
             }
         }
     }