• 音视频同步测试方法

    1.计算依据

    延迟结果=图像出现时间-音频出现时间+客户端校验值(可正可负)

    判断依据：一般延时结果在200ms内属于正常范围

    2.获取视频信息

    a.mediainfo

    cd到视频文件的路径，然后在终端输入如下命令：

    mediainfo a.mp4

    输出结果：

    Javacv使用ffmpeg实现音视频同步播放
    pdf 0星 超过10%的资源 178KB
    下载
    1. General
    2. Complete name                            : a.mp4
    3. Format                                   : MPEG-4
    4. Format profile                           : Base Media
    5. Codec ID                                 : isom (isom/iso2/avc1/mp41)
    6. File size                                : 13.1 MiB
    7. Duration                                 : 19 s 947 ms
    8. Overall bit rate mode                    : Variable
    9. Overall bit rate                         : 5 491 kb/s
    10. Writing application                      : Lavf58.20.100
    11.  
    12. Video
    13. ID                                       : 1
    14. Format                                   : AVC
    15. Format/Info                              : Advanced Video Codec
    16. Format profile                           : High@L4
    17. Format settings                          : CABAC / 4 Ref Frames
    18. Format settings, CABAC                   : Yes
    19. Format settings, Reference frames        : 4 frames
    20. Codec ID                                 : avc1
    21. Codec ID/Info                            : Advanced Video Coding
    22. Duration                                 : 19 s 920 ms
    23. Bit rate                                 : 5 490 kb/s
    24. Width                                    : 1 920 pixels
    25. Height                                   : 1 080 pixels
    26. Display aspect ratio                     : 16:9
    27. Frame rate mode                          : Constant
    28. Frame rate                               : 25.000 FPS
    29. Color space                              : YUV
    30. Chroma subsampling                       : 4:2:0
    31. Bit depth                                : 8 bits
    32. Scan type                                : Progressive
    33. Bits/(Pixel*Frame)                       : 0.106
    34. Stream size                              : 13.0 MiB (100%)
    35. Writing library                          : x264 core 155 r2917 0a84d98
    36. Encoding settings                        : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
    37. Language                                 : English
    38. Codec configuration box                  : avcC
    39.  
    40. Audio
    41. ID                                       : 2
    42. Format                                   : AAC LC
    43. Format/Info                              : Advanced Audio Codec Low Complexity
    44. Codec ID                                 : mp4a-40-2
    45. Duration                                 : 19 s 947 ms
    46. Bit rate mode                            : Variable
    47. Bit rate                                 : 2 277 b/s
    48. Maximum bit rate                         : 128 kb/s
    49. Channel(s)                               : 2 channels
    50. Channel layout                           : L R
    51. Sampling rate                            : 48.0 kHz
    52. Frame rate                               : 46.875 FPS (1024 SPF)
    53. Compression mode                         : Lossy
    54. Stream size                              : 5.54 KiB (0%)
    55. Language                                 : English
    56. Default                                  : Yes
    57. Alternate group                          : 1

    从输出结果可以看到延迟结果=(19.920-19.947)*1000=27ms，属于正常范围

    b.ffprobe

    cd到视频文件的路径，然后在终端输入如下命令：

    ffprobe -v quiet -print_format json -show_format -show_streams -show_error -show_chapters a.mp4
    1. {
    2.     "streams": [
    3.         {
    4.             "index": 0,
    5.             "codec_name": "h264",
    6.             "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
    7.             "profile": "High",
    8.             "codec_type": "video",
    9.             "codec_tag_string": "avc1",
    10.             "codec_tag": "0x31637661",
    11.             "width": 1920,
    12.             "height": 1080,
    13.             "coded_width": 1920,
    14.             "coded_height": 1080,
    15.             "closed_captions": 0,
    16.             "film_grain": 0,
    17.             "has_b_frames": 2,
    18.             "pix_fmt": "yuv420p",
    19.             "level": 40,
    20.             "chroma_location": "left",
    21.             "field_order": "progressive",
    22.             "refs": 1,
    23.             "is_avc": "true",
    24.             "nal_length_size": "4",
    25.             "id": "0x1",
    26.             "r_frame_rate": "25/1",
    27.             "avg_frame_rate": "25/1",
    28.             "time_base": "1/12800",
    29.             "start_pts": 0,
    30.             "start_time": "0.000000",
    31.             "duration_ts": 254976,
    32.             "duration": "19.920000",
    33.             "bit_rate": "5489806",
    34.             "bits_per_raw_sample": "8",
    35.             "nb_frames": "498",
    36.             "extradata_size": 43,
    37.             "disposition": {
    38.                 "default": 1,
    39.                 "dub": 0,
    40.                 "original": 0,
    41.                 "comment": 0,
    42.                 "lyrics": 0,
    43.                 "karaoke": 0,
    44.                 "forced": 0,
    45.                 "hearing_impaired": 0,
    46.                 "visual_impaired": 0,
    47.                 "clean_effects": 0,
    48.                 "attached_pic": 0,
    49.                 "timed_thumbnails": 0,
    50.                 "captions": 0,
    51.                 "descriptions": 0,
    52.                 "metadata": 0,
    53.                 "dependent": 0,
    54.                 "still_image": 0
    55.             },
    56.             "tags": {
    57.                 "language": "eng",
    58.                 "handler_name": "\u001fMainconcept Video Media Handler",
    59.                 "vendor_id": "[0][0][0][0]"
    60.             }
    61.         },
    62.         {
    63.             "index": 1,
    64.             "codec_name": "aac",
    65.             "codec_long_name": "AAC (Advanced Audio Coding)",
    66.             "profile": "LC",
    67.             "codec_type": "audio",
    68.             "codec_tag_string": "mp4a",
    69.             "codec_tag": "0x6134706d",
    70.             "sample_fmt": "fltp",
    71.             "sample_rate": "48000",
    72.             "channels": 2,
    73.             "channel_layout": "stereo",
    74.             "bits_per_sample": 0,
    75.             "id": "0x2",
    76.             "r_frame_rate": "0/0",
    77.             "avg_frame_rate": "0/0",
    78.             "time_base": "1/48000",
    79.             "start_pts": 0,
    80.             "start_time": "0.000000",
    81.             "duration_ts": 956400,
    82.             "duration": "19.925000",
    83.             "bit_rate": "2277",
    84.             "nb_frames": "935",
    85.             "extradata_size": 5,
    86.             "disposition": {
    87.                 "default": 1,
    88.                 "dub": 0,
    89.                 "original": 0,
    90.                 "comment": 0,
    91.                 "lyrics": 0,
    92.                 "karaoke": 0,
    93.                 "forced": 0,
    94.                 "hearing_impaired": 0,
    95.                 "visual_impaired": 0,
    96.                 "clean_effects": 0,
    97.                 "attached_pic": 0,
    98.                 "timed_thumbnails": 0,
    99.                 "captions": 0,
    100.                 "descriptions": 0,
    101.                 "metadata": 0,
    102.                 "dependent": 0,
    103.                 "still_image": 0
    104.             },
    105.             "tags": {
    106.                 "language": "eng",
    107.                 "handler_name": "#Mainconcept MP4 Sound Media Handler",
    108.                 "vendor_id": "[0][0][0][0]"
    109.             }
    110.         }
    111.     ],
    112.     "chapters": [
    113.  
    114.     ],
    115.     "format": {
    116.         "filename": "a.mp4",
    117.         "nb_streams": 2,
    118.         "nb_programs": 0,
    119.         "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
    120.         "format_long_name": "QuickTime / MOV",
    121.         "start_time": "0.000000",
    122.         "duration": "19.947000",
    123.         "size": "13691488",
    124.         "bit_rate": "5491146",
    125.         "probe_score": 100,
    126.         "tags": {
    127.             "major_brand": "isom",
    128.             "minor_version": "512",
    129.             "compatible_brands": "isomiso2avc1mp41",
    130.             "encoder": "Lavf58.20.100"
    131.         }
    132.     }
    133. }

    从输出结果依然可以看到延迟结果=(19.920-19.947)*1000=27ms，属于正常范围

  • 相关阅读:
    java-net-php-python-jspm在线作业提交系统计算机毕业设计程序
    数据库理论知识及相关发展方向
    uniapp 跳转页面保存和刷新 拦截器的使用
    Vue 路由懒加载
    uniapp引入uniapp打包的H5跳转H5以及H5返回app方法
    .Net Core 3.0 对 MongoDB 的多条件（两种）查询操作
    针对语音服务提供厂商的记录（2022-08-16）
    关于content-type的理解
    【简单易操作】图漾TM460-E2深度网络相机在ROS-melodic环境下的配置过程
    43_Object类
  • 原文地址：https://blog.csdn.net/weixin_39810558/article/details/126226242