使用ffprobe获取音频信息（JSON格式）
用ffmpeg中ffprobe以JSON格式获取音频信息
在外部程序调用并处理音频视频信息时，通过ffmpeg/ffprobe查看音频视频文件信息并输出为json格式是非常实用的功能,在终端输入以下命令：
ffprobe -v quiet -print_format json -show_format -show_streams #{source}#{source}部分替换为mp3文件所在路径。输出如下：
{
"streams": [
{
"index": 0,
"codec_name": "mp3",
"codec_long_name": "MP3 (MPEG audio layer 3)",
"codec_type": "audio",
"codec_time_base": "1/44100",
"codec_tag_string": "[0][0][0][0]",
"codec_tag": "0x0000",
"sample_fmt": "s16p",
"sample_rate": "44100",
"channels": 2,
"channel_layout": "stereo",
"bits_per_sample": 0,
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/14112000",
"start_pts": 353600,
"start_time": "0.025057",
"duration_ts": 3346145280,
"duration": "237.113469",
"bit_rate": "128000",
"disposition": {
"default": 0,
"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": {
"encoder": "LAME3.99r"
},
"side_data_list": [
{
"side_data_type": "Replay Gain"
}
]
},
{
"index": 1,
"codec_name": "mjpeg",
"codec_long_name": "Motion JPEG",
"codec_type": "video",
"codec_time_base": "0/1",
"codec_tag_string": "[0][0][0][0]",
"codec_tag": "0x0000",
"width": 500,
"height": 500,
"coded_width": 500,
"coded_height": 500,
"has_b_frames": 0,
"sample_aspect_ratio": "0:1",
"display_aspect_ratio": "0:1",
"pix_fmt": "yuvj444p",
"level": -99,
"color_range": "pc",
"color_space": "bt470bg",
"chroma_location": "center",
"refs": 1,
"r_frame_rate": "90000/1",
"avg_frame_rate": "0/0",
"time_base": "1/90000",
"start_pts": 2255,
"start_time": "0.025056",
"duration_ts": 21340212,
"duration": "237.113467",
"bits_per_raw_sample": "8",
"disposition": {
"default": 0,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 1,
"timed_thumbnails": 0
},
"tags": {
"comment": "Cover (front)"
}
}
],
"format": {
"filename": "/Users/mac123/Desktop/music/张学友 - 吻别 (摇滚版).mp3",
"nb_streams": 2,
"nb_programs": 0,
"format_name": "mp3",
"format_long_name": "MP2/3 (MPEG audio layer 2/3)",
"start_time": "0.025056",
"duration": "237.113469",
"size": "3864162",
"bit_rate": "130373",
"probe_score": 51,
"tags": {
"ID": "7063568",
"title": "吻别 (摇滚版)",
"artist": "张学友",
"album": "Jacky cheung 15",
"genre": "Blues"
}
}
}