FFmpeg命令行工具学习(一)：查看媒体文件头信息工具ffprobe

一、简述

ffprobe是ffmpeg命令行工具中相对简单的，此命令是用来查看媒体文件格式的工具。

二、命令格式

在命令行中输入如下格式的命令：

ffprobe [文件名] 

三、使用ffprobe查看mp3格式的文件

本文使用的是歌曲《社会摇》，执行的命令为：

ffprobe shy.mp3 

输出内容为：

Input #, mp3, from 'shy.mp3':
  Metadata:
    genre           : Blues
    encoder         : Lavf56.4.101
    comment         :  key(Don't modify):L64FU3W4YxX3ZFTmbZ+8/UO6KmVXLfTij3uZN/wCXE4a00XHtvOwccwFlS+8ednRD4MnrdUH+aUYZFVY8bObsrabtBM2Ps/UAWPJtsmW/3RXnn6eJcNUHrPALM0003fIpQnn6MOWbdXqog6WFDLpaZJhoPMnFy9u41HxCalUwMEc+mkHNn+nSLlioJfpv4wPBwUhxfLNmOScmXPzOary2k37A/brRx7QUlMD9rkaZ
    album           : 社会摇
    title           : 社会摇
    artist          : 萧全
    track           :
  Duration: ::09.34, start: 0.025056, bitrate:  kb/s
    Stream #:: Audio: mp3,  Hz, stereo, s16p,  kb/s
    Stream #:: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 500x500 [SAR : DAR :], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      comment         : Media (e.g. label side of CD)

首先我们看以下这行信息：

Duration: ::09.34, start: 0.025056, bitrate:  kb/s

这行信息表示，该视频文件的时长是4分9秒340毫秒，开始播放时间是0.025056，整个文件的比特率是256Kbit/s，然后我们看下一行信息：

Stream #:: Audio: mp3,  Hz, stereo, s16p,  kb/s

这行信息表示，第一个流是音频流，编码格式是MP3格式，采样率是44.1KHz，声道是立体声，采样表示格式是SInt16(short)的planner(平铺格式)，这路流的比特率320Kbit/s。

四、使用ffprobe查看mp4格式的文件

本文使用的是视频《泡沫》，执行的命令为：

ffprobe pm.mp4 

输出内容为：

Input #, mov,mp4,m4a,3gp,3g2,mj2, from 'pm.mp4':
  Metadata:
    major_brand     : isom
    minor_version   :
    compatible_brands: isomavc1
    creation_time   : --17T16::.000000Z
    album           : Yinyuetai
    artist          : yinyuetai.com
    comment         : Yinyuetai-1TR1151
    date            : // ::
  Duration: ::33.51, start: 0.000000, bitrate:  kb/s
    Stream #:(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 960x540,  kb/s,  fps,  tbr, 25k tbn,  tbc (default)
    Metadata:
      creation_time   : --17T16::.000000Z
      handler_name    : @GPAC0.5.1-DEV-rev5472
    Stream #:(und): Audio: aac (LC) (mp4a / 0x6134706D),  Hz, stereo, fltp,  kb/s (default)
    Metadata:
      creation_time   : --17T15::.000000Z
      handler_name    : Sound Media Handler

首先我们看以下这行信息：

Duration: ::33.51, start: 0.000000, bitrate:  kb/s

这行信息表示，该视频文件的时长是4分33秒510毫秒，开始播放时间是0，整个文件的比特率是1104Kbit/s，然后我们看下一行信息：

Stream #:(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 960x540,  kb/s,  fps,  tbr, 25k tbn,  tbc (default)

这行信息表示，第一个流是视频流，编码格式是H264格式(封装格式为AVC1)，每一帧的数据表示为yuv420p，分辨率为960x540，这路流的比特率为1108Kbit/s，帧率为每秒钟25帧。

接下来我们看下一行：

Stream #:(und): Audio: aac (LC) (mp4a / 0x6134706D),  Hz, stereo, fltp,  kb/s (default)

这行信息表示第二个流是音频流，编码方式为ACC（封装格式为MP4A），并且采用的Profile是LC规格，采样率是44.1KHz，声道是立体声，这路流的比特率92Kbit/s。

到此为止，我们就掌握了使用ffprobe提取媒体的头文件信息的方式，并了解了提取出来的信息的含义

五、ffprobe高级使用方式

1. 输出格式信息

appledeMacBook-Pro:Desktop renhui$ ffprobe -show_format  pm.mp4
ffprobe version 3.4. Copyright (c) - the FFmpeg developers
  built with Apple LLVM version 9.0. (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4. --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  libavutil      . 78.100 / . 78.100
  libavcodec     57.107. / 57.107.
  libavformat    . 83.100 / . 83.100
  libavdevice    . 10.100 / . 10.100
  libavfilter     6.107. /  6.107.
  libavresample   .  .   /  .  .
  libswscale      .  8.100 /  .  8.100
  libswresample   .  9.100 /  .  9.100
  libpostproc    .  7.100 / .  7.100
Input #, mov,mp4,m4a,3gp,3g2,mj2, from 'pm.mp4':
  Metadata:
    major_brand     : isom
    minor_version   :
    compatible_brands: isomavc1
    creation_time   : --17T16::.000000Z
    album           : Yinyuetai
    artist          : yinyuetai.com
    comment         : Yinyuetai-1TR1151
    date            : // ::
  Duration: ::33.51, start: 0.000000, bitrate:  kb/s
    Stream #:(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 960x540,  kb/s,  fps,  tbr, 25k tbn,  tbc (default)
    Metadata:
      creation_time   : --17T16::.000000Z
      handler_name    : @GPAC0.5.1-DEV-rev5472
    Stream #:(und): Audio: aac (LC) (mp4a / 0x6134706D),  Hz, stereo, fltp,  kb/s (default)
    Metadata:
      creation_time   : --17T15::.000000Z
      handler_name    : Sound Media Handler
[FORMAT]
filename=pm.mp4
nb_streams=
nb_programs=
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=273.506667
size=
bit_rate=
probe_score=
TAG:major_brand=isom
TAG:minor_version=
TAG:compatible_brands=isomavc1
TAG:creation_time=--17T16::.000000Z
TAG:album=Yinyuetai
TAG:artist=yinyuetai.com
TAG:comment=Yinyuetai-1TR1151
TAG:date=// ::
[/FORMAT]

2. 输出每个流的具体信息（以JSON格式）

appledeMacBook-Pro:Desktop renhui$ ffprobe -print_format json  -show_streams pm.mp4
ffprobe version 3.4. Copyright (c) - the FFmpeg developers
  built with Apple LLVM version 9.0. (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4. --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  libavutil      . 78.100 / . 78.100
  libavcodec     57.107. / 57.107.
  libavformat    . 83.100 / . 83.100
  libavdevice    . 10.100 / . 10.100
  libavfilter     6.107. /  6.107.
  libavresample   .  .   /  .  .
  libswscale      .  8.100 /  .  8.100
  libswresample   .  9.100 /  .  9.100
  libpostproc    .  7.100 / .  7.100
{
Input #, mov,mp4,m4a,3gp,3g2,mj2, from 'pm.mp4':
  Metadata:
    major_brand     : isom
    minor_version   :
    compatible_brands: isomavc1
    creation_time   : --17T16::.000000Z
    album           : Yinyuetai
    artist          : yinyuetai.com
    comment         : Yinyuetai-1TR1151
    date            : // ::
  Duration: ::33.51, start: 0.000000, bitrate:  kb/s
    Stream #:(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 960x540,  kb/s,  fps,  tbr, 25k tbn,  tbc (default)
    Metadata:
      creation_time   : --17T16::.000000Z
      handler_name    : @GPAC0.5.1-DEV-rev5472
    Stream #:(und): Audio: aac (LC) (mp4a / 0x6134706D),  Hz, stereo, fltp,  kb/s (default)
    Metadata:
      creation_time   : --17T15::.000000Z
      handler_name    : Sound Media Handler
    "streams": [
        {
            "index": ,
            "codec_name": "h264",
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
            "profile": "Main",
            "codec_type": "video",
            "codec_time_base": "1/50",
            "codec_tag_string": "avc1",
            "codec_tag": "0x31637661",
            "width": ,
            "height": ,
            "coded_width": ,
            "coded_height": ,
            "has_b_frames": ,
            "sample_aspect_ratio": "0:1",
            "display_aspect_ratio": "0:1",
            "pix_fmt": "yuv420p",
            "level": ,
            "chroma_location": "left",
            "refs": ,
            "is_avc": "true",
            "nal_length_size": "",
            "r_frame_rate": "25/1",
            "avg_frame_rate": "25/1",
            "time_base": "1/25000",
            "start_pts": ,
            "start_time": "0.000000",
            "duration_ts": ,
            "duration": "273.400000",
            "bit_rate": "",
            "bits_per_raw_sample": "",
            "nb_frames": "",
            "disposition": {
                "default": ,
                "dub": ,
                "original": ,
                "comment": ,
                "lyrics": ,
                "karaoke": ,
                "forced": ,
                "hearing_impaired": ,
                "visual_impaired": ,
                "clean_effects": ,
                "attached_pic": ,
                "timed_thumbnails":
            },
            "tags": {
                "creation_time": "2016-12-17T16:02:05.000000Z",
                "language": "und",
                "handler_name": "264@GPAC0.5.1-DEV-rev5472"
            }
        },
        {
            "index": ,
            "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": "",
            "channels": ,
            "channel_layout": "stereo",
            "bits_per_sample": ,
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/44100",
            "start_pts": ,
            "start_time": "0.000000",
            "duration_ts": ,
            "duration": "273.507846",
            "bit_rate": "",
            "max_bit_rate": "",
            "nb_frames": "",
            "disposition": {
                "default": ,
                "dub": ,
                "original": ,
                "comment": ,
                "lyrics": ,
                "karaoke": ,
                "forced": ,
                "hearing_impaired": ,
                "visual_impaired": ,
                "clean_effects": ,
                "attached_pic": ,
                "timed_thumbnails":
            },
            "tags": {
                "creation_time": "2016-12-17T15:50:54.000000Z",
                "language": "und",
                "handler_name": "Sound Media Handler"
            }
        }
    ]
}

3. 显示帧信息

ffprobe -show_frames pm.mp4

4. 查看包信息

ffprobe -show_packets pm.mp4