Android多媒体信息获取

Posted 2023-05-13

参考技术A android开发中，常常需要获取本地或者网络多媒体的一些基本信息。MediaMetadataRetriever类位于android.media包下，提供了用于从输入媒体文件检索帧和元数据的统一接口，可以很方便实现这些功能。

本例中提供了获取本地视频和网络视频第一帧图片的功能，首先初始化MediaMetadataRetriever，如果是本地视频设置数据源时通过 Uri.fromFile()转化为Uri对象，再通过MediaMetadataRetriever的getFrameAtTime()方法默认获取第一帧图片。如果是网络视频直接将url设置为数据源即可。

ffmpeg音视频开发: 使用ffprobe获取媒体信息

一、环境介绍

操作系统: win10 64位

ffmpge:  4.2.2 (官网下载的可执行文件命令) 

win32下使用FFMPEG 4.2.2库下载地址：https://download.csdn.net/download/xiaolong1126626497/12321684

二、ffprobe用法

2.1 基本使用: 查看媒体信息

用法：

C:/FFMPEG/ffmpeg_x86_4.2.2/bin/ffprobe.exe -i .\\jiyi.mp4

示例：

PS D:\\> C:/FFMPEG/ffmpeg_x86_4.2.2/bin/ffprobe.exe -i .\\jiyi.mp4
ffprobe version 4.2.2 Copyright (c) 2007-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\\jiyi.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:54.15, start: 0.000000, bitrate: 574 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 960x544, 518 kb/s, 29.97 fps, 29.97 tbr, 19200 tbn, 38400 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 47 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
PS D:\\>

2.2  使用JSON格式输出信息

 用法：

C:/FFMPEG/ffmpeg_x86_4.2.2/bin/ffprobe.exe -v quiet -of json -i .\\jiyi.mp4  -show_streams

示例:

PS D:\\> C:/FFMPEG/ffmpeg_x86_4.2.2/bin/ffprobe.exe -v quiet -of json -i .\\jiyi.mp4  -show_streams
{
    "streams": [
        {
            "index": 0,
            "codec_name": "h264",
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
            "profile": "High",
            "codec_type": "video",
            "codec_time_base": "8123/486900",
            "codec_tag_string": "avc1",
            "codec_tag": "0x31637661",
            "width": 960,
            "height": 544,
            "coded_width": 960,
            "coded_height": 544,
            "has_b_frames": 1,
            "pix_fmt": "yuv420p",
            "level": 31,
            "color_range": "tv",
            "color_space": "bt709",
            "color_transfer": "bt709",
            "color_primaries": "bt709",
            "chroma_location": "left",
            "refs": 1,
            "is_avc": "true",
            "nal_length_size": "4",
            "r_frame_rate": "30000/1001",
            "avg_frame_rate": "243450/8123",
            "time_base": "1/19200",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 1039744,
            "duration": "54.153333",
            "bit_rate": "518796",
            "bits_per_raw_sample": "8",
            "nb_frames": "1623",
            "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": "und",
                "handler_name": "Core Media Video"
            }
        },
        {
            "index": 1,
            "codec_name": "aac",
            "codec_long_name": "AAC (Advanced Audio Coding)",
            "profile": "LC",
            "codec_type": "audio",
            "codec_time_base": "1/44100",
            "codec_tag_string": "mp4a",
            "codec_tag": "0x6134706d",
            "sample_fmt": "fltp",
            "sample_rate": "44100",
            "channels": 1,
            "channel_layout": "mono",
            "bits_per_sample": 0,
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/44100",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 2387471,
            "duration": "54.137664",
            "bit_rate": "47025",
            "max_bit_rate": "47025",
            "nb_frames": "2332",
            "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": "und",
                "handler_name": "Core Media Audio"
            }
        }
    ]
}
PS D:\\>