MKV封装的avs2文件在ffplay播放时无法快进/快退。

文件封装格式和流信息如下。
{
[davs2 info]: davs2: 1.6.205 b06d7585620f4e90.8, 2021-08-02 15:04:43
[davs2 info]: CPU Capabilities:  MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 LZCNT
[davs2 info]: Manager 7fd46f1f5020: using 1 thread(s): 1(frame/AEC)+0(pool/REC), 2 tasks
[davs2 info]: Manager 7fd46f1f5020: Sequence Resolution: 480x270.
Input #0, matroska,webm, from 'AVS2_480x270@25fps_410KBps.mkv':
  Metadata:
    COMPATIBLE_BRANDS: mp42mp41
    MAJOR_BRAND     : mp42
    MINOR_VERSION   : 1
    ENCODER         : Lavf58.45.100
  Duration: 00:00:40.00, start: 0.000000, bitrate: 418 kb/s
    Stream #0:0(eng): Video: avs2 (AVS2 / 0x32535641), yuv420p, 480x270, 25 fps, 25 tbr, 1k tbn, 25 tbc (default)
    Metadata:
      HANDLER_NAME    : Apple Video Media Handler
      ENCODER         : Lavc58.91.100 libxavs2
      DURATION        : 00:00:40.000000000
[davs2 info]: davs2: 1.6.205 b06d7585620f4e90.8, 2021-08-02 15:04:43
[davs2 info]: CPU Capabilities:  MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 LZCNT
[davs2 info]: Manager 5637f4401340: using 1 thread(s): 1(frame/AEC)+0(pool/REC), 2 tasks
    "streams": [
        {
            "index": 0,
            "codec_name": "avs2",
            "codec_long_name": "AVS2-P2/IEEE1857.4",
            "codec_type": "video",
            "codec_time_base": "1/25",
            "codec_tag_string": "AVS2",
            "codec_tag": "0x32535641",
            "width": 480,
            "height": 270,
            "coded_width": 480,
            "coded_height": 270,
            "closed_captions": 0,
            "has_b_frames": 0,
            "pix_fmt": "yuv420p",
            "level": -99,
            "chroma_location": "left",
            "refs": 1,
            "r_frame_rate": "25/1",
            "avg_frame_rate": "25/1",
            "time_base": "1/1000",
            "start_pts": 0,
            "start_time": "0.000000",
            "disposition": {
                "default": 1,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0
            },
            "tags": {
                "language": "eng",
                "HANDLER_NAME": "Apple Video Media Handler",
                "ENCODER": "Lavc58.91.100 libxavs2",
                "DURATION": "00:00:40.000000000"
            }
        }
    ],
    "format": {
        "filename": "AVS2_480x270@25fps_410KBps.mkv",
        "nb_streams": 1,
        "nb_programs": 0,
        "format_name": "matroska,webm",
        "format_long_name": "Matroska / WebM",
        "start_time": "0.000000",
        "duration": "40.000000",
        "size": "2092897",
        "bit_rate": "418579",
        "probe_score": 100,
        "tags": {
            "COMPATIBLE_BRANDS": "mp42mp41",
            "MAJOR_BRAND": "mp42",
            "MINOR_VERSION": "1",
            "ENCODER": "Lavf58.45.100"
        }
    }
}

pkuvcl/FFmpegAVS2

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pkuvcl/FFmpegAVS2 .gitee-modal { width: 500px !important; }

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