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vc1_parser: Reset unesc_index after extracting header with complete frames

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When PARSER_FLAG_COMPLETE_FRAMES is set (e.g. in Matroska),
unesc_index is not reset after the first frame, which causes
subsequent frames to inherit leftover header data.

This leads to incorrect keyframe marking and broken decoding.

See also this bug report: https://trac.ffmpeg.org/ticket/8515

Signed-off-by: DE-AI <max.christoph@pentaxmedical.com>
This commit is contained in:
DE-AI
2025-09-05 15:27:01 +00:00
committed by James Almer
parent 1f2de0f618
commit fbbb2996d5
1 changed files with 1 additions and 0 deletions
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libavcodec/vc1_parser.c
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@@ -179,6 +179,7 @@ static int vc1_parse(AVCodecParserContext *s,
// start codes if we know it contains a complete frame and
// we've already unescaped all we need of the frame header
vc1_extract_header(s, avctx, unesc_buffer, unesc_index);
unesc_index = 0;
break;
}
if (unesc_index >= UNESCAPED_THRESHOLD && !start_code_found) {