FFmpeg user manual-common ffprobe commands

FFmpeg user manual-common ffprobe commands
In the FFMpeg suite, there are ffmpeg and ffprobe, which are mainly used to view the information of multimedia files. The following describes common basic commands in ffprobe.
5.1 ffprobe common parameters
Ffprobe has many common parameters. You can use ffprobe -- help to view detailed information:

5.2 The following focuses on several examples:
5.2.1 use show_packets to view multimedia reports:

The multimedia package information displayed by show_packets is included by the PACKET tag. The information contained in the PACKET tag is as follows:
Codec_type: multimedia type, such as video package and audio package;
Stream_index: multimedia stream index;
Pts: display time value of Multimedia
Pts_time: The display time of multimedia after calculation based on different formats
Dts: multimedia decoding Time Value
Dts_time: multimedia decoding time after calculation based on different formats
Duration: the time used by the multimedia package.
Duration_time: the time used by the multimedia package after calculation based on different formats
Size: the size of the multimedia package.
Pos: The file offset location of the multimedia package
Flags: multimedia package tag, key package tag and non-key package tag

In addition to the preceding fields and information, you can use the show_data and show_packets combinations to display the specific data in the packets package:

The figure shows the data contained in the multimedia package. The initial information is 0000 01b6 51e0 47ff. We can view the data based on the pos in the figure, that is, the file offset position. According to the figure, the pos value is 3273. It is converted to hexadecimal with the position 0x00000cc9, which can correspond to data:

Use ffprobe to read packets for corresponding data analysis. Use show_packets with show_data for more accurate analysis.
5.2.2 In addition to packets and data, ffprobe can also analyze the multimedia Encapsulation FORMAT. The show_format parameter can be used to view the multimedia Encapsulation FORMAT, but the FORMAT label is used for display:

By reading the format information, we can see that this video file has only one channel. The starting time is 0.000000, the length is 85.867000, the file size is 2377700 bytes, And the bit rate is 221523 bytes per second, this file may be mov, mp4, m4a, 3gp, 3g2, or mj2, and ffprobe outputs this way, because the labels identified by these encapsulation formats are basically the same in ffmpeg, so there are so many display modes, and Other encapsulation formats are not necessarily like this, next, let's look at the Encapsulation Format of A wmv.

The input. wmv file contains two channels. The file Encapsulation Format is asf.
5.2.3 you can use the show_frame parameter of ffprobe to view the FRAME information in the video file. The output FRAME information is enclosed by the FRAME tag.

You can view the information of each frame through the-show_frame parameter. The following describes the important information.

Attribute	Description	Value
Media_type	Frame Type (video, audio, subtitles, etc)	Video
Stream_index	Index Area of the frame	0
Key_frame	Whether it is a key frame	1
Pkt_pts	Pts of the Frame package	0
Pkt_pts_time	Display the pts time of the Frame package	0.000000
Pkt_dts	Frame package dts	0
Pkt_dts_time	Frame package dts Time Display	0.000000
Pkt_duration	Duration of the Frame package	1024
Pkt_duration_tine	Frame package duration display	0.066667
Pkt_pos	Offset position of the file where the Frame package is located	44
Width	Frame display width	608
Height	Frame display height	320
Pix_fmt	Frame image color format	Yuv420p
Pict_type	Frame Type	I

When the commonly used Elecard Stream Eye in windows is opened to view mp4, a very intuitive Frame Type display is displayed, and the judgment of each frame can be seen using the pict_type of ffprobe, the size of each frame can also be seen through the pkt_size of ffprobe. pict_type can be used to obtain the video frame I, P, or B.
The-show_streams parameter allows you to view the stream information in the multimedia file. The stream information is enclosed by the STREAMS Tag:

To view the stream information:

Attribute	Description	Value
Index	Index Area of the stream	0
Codec_name	Encoding name	Mpeg4
Codec_long_name	Full name	MPEG-4 part 2
Profile	Encoded profile	Simple Profile
Level	Encoding level	1
Has_ B _frames	Contains B frame information	0
Codec_tyoe	Encoding type	Video
Codec_time_base	Encoding timestamp calculation base unit	1/15
Pix_fmt	Image Display image color format	Yuv420p
Coded_width	Image Width	608
Coded_height	Image Height	320
Codec_tag_string	Encoded tag data	Mp4v

In addition to the above information, there is more information

Next we will introduce the information in section 1.

Attribute	Description	Value
R_frame_rate	Actual Frame Rate	15/1
Avg_frame_rate	Average Frame Rate	15/1
Time_base	Time Base (used for timestamp calculation)	1/15360
Bit_rate	Bit Rate	220914
Max_bit_rate	Maximum Bit Rate	220914
Nb_frames	Frames	1288

5.3 ffprobe can obtain the corresponding key-value by using the preceding parameters, but some people think it is convenient and some people think it is inconvenient to read because they are used to it, in this way, the print_format parameter of ffprobe is used for corresponding format output. The following are several output examples:
5.3.1XML format output:

5.3.2ini output

5.3.3flat format output

5.3.4json output

5.3.5csv format output

You can use the corresponding Plotting Method to draw a visual image through various output formats:
Use excel to open a table after output in csv format

Graph The data in the table

When the image is drawn, you can see that the corresponding image is basically the same as Elecard Stream Eye.

5.4 If you only want to view the audio stream or video stream, use the select_streams parameter. For example, you can only view the frames information of the Video Stream:

Ffprobe-show_frames-select_streams v-ofxml input.mp4

After the command line is executed, the output information is as follows, all of which are video frames information: