FFmpeg Advanced Series 01-ffplay Command detailed

Overview

1. Ffplay is a multimedia player based on the FFmpeg Library and SDL Library development. Its main purpose is to test the various APIs of ffmpeg, such as Codec/format/filter and so on.
2. Mastering the design logic of Ffplay is very helpful for player developers to improve their experience. The ijkplayer of the Beep is based on the development of Ffplay two times. Command format

   ffplay [Options] [Input_url]

Main options

Options	Description
-X Width	Force display of broadband.
-Y Height	Force display height.
-S size	Frame size settings Display frame storage (WxH format), only available for videos that do not contain frame size (WxH) like original YUV. This parameter has been deprecated, please try to replace it with-video_size
-fs	Starts in full-screen mode.
-an	Disable audio (do not play sound)
-vn	Disable video (do not play video)
-sn	Disable subtitles (do not display subtitles)
-ss POS	Based on the set of seconds to locate the drag, note the time unit: such as ' seconds ', ' 12:03:45 ', hours, minutes and seconds, ' 23.189 ' 23.189 second
-T duration	Set playback video/audio length, time units such as-SS options
-bytes	Position the drag by byte.
-seek_interval interval	Custom left/Right key anchor drag interval (in seconds), default value is 10 seconds
-nodisp	Close the graphical display window and the video will not display
-noborder	No Border window
-volume Vol.	Sets the start volume. Volume range [0 ~100]
-F FMT	Forces parsing using the format of the setting. Like-f S16le
-window_title Title	Set the window caption (default = input file name)
-loop number	Set the number of playback cycles
-showmode mode	Set display mode, available mode values: 0 display video, 1 display audio waveform, 2 display audio spectrum. The default is 0, and automatically selects 2 if the video does not exist.
-VF Filtergraph	Set up a video filter
-af Filtergraph	Set Audio Filters
-I. Input_url	Input_url

Advanced options

Options	Description
-PIX_FMT format	Format the pixel format. This option has been deprecated and is beneficial for private options, Try-pixel_format
-stats	Print multiple playback statistics, including display stream duration, edit xxx parameters, current position in the stream, and audio/video sync difference. Enabled by default, you need to specify-nostats to explicitly disable it.
-fast	Multimedia compatibility optimization of non-standardized specifications
-genpts	Generate PTS.
-sync type	The sync type sets the master clock to Audio (Type=audio), Video (type=video), or external (type=ext), which is the main clock by default.
-ast Audio_stream_specifier	Specifies an audio stream index, such as-ast 3, which plays stream index 3
-vst Video_stream_specifier	Specifies the video stream index, such as-vst 4, which plays stream index 4
-sst Subtitle_stream_specifier	Specify a caption stream index, such as-sst 5, with a stream index of 5 subtitle stream
-autoexit	Exit after the video has finished playing.
-exitonkeydown	Keyboard Press any key to exit playback
-exitonmousedown	Mouse Press any key to exit playback
-codec:media_specifier Codec_name	Mandatory use of the set multimedia Xxx,media_specifier available values are a (audio), V (video) and S subtitles. such as-codec:v h265 mandatory video with h265 decoding
-acodec Codec_name	Force audio decoding with set audio xxx
-vcodec Codec_name	Force video decoding with set video xxx
-scodec Codec_name	Force subtitle decoding with set caption xxx
-autorotate	Automatically rotate video based on file metadata. Enabled by default, use-noautorotate if you want to disable
-framedrop	If the video is out of sync, the video frame is discarded. The primary clock is turned on by default when it is not a video clock. Use-noframedrop If you want to disable
-infbuf	The input buffer size is not limited. Read as much data as you can from the input as quickly as possible. It is enabled by default when the live stream is played, and data may be discarded if the data is not read in time. This option will not limit the size of the buffer. Use-NOINFBUF If you want to disable

Playback controls

Options	Description
Q, ESC	Exit playback
F	Full Screen Toggle
P, SPC	Time out
M	Mute Toggle
9, 0	9 volume reduction, 0 increase volume
/, *	/decrease volume, * increase volume
A	Cycle through audio streams
V	Cycle through video streams
T	Cycle through a caption stream
C	Cycle through programs
W	Cycle switch Filter or display mode
S	Play Frames by frame
Left/right	Drag backward/forward for 10 seconds
Down/up	Drag backwards/forwards for 1 minutes
Page Down/page up	Drag the previous/next. Or, if no chapters are dragged backwards/forwards for 10 minutes.
Right-click	Drag a file that corresponds to a percentage of the display width to play
Left mouse button Double-click	Full Screen Toggle

Application example to play media files

1. To open a live stream, you can use the command
   Ffplay-window_title "rtmp Stream" rtmp://202.69.69.180:443/webcast/bshdlive-pc
   
2. Play a video from 2 seconds, play for 10 seconds, automatically exit Ffplay after playback is complete, the player's window title is "Test Time",
   Ffplay-window_title "Test Time"-ss 2-t 10-autoexit Test.mp4

3. Forcing the use of mp3xxx to decode AAC audio will cause an error:
   Ffplay-acodec mp3 Test.mp4

4. When more than one program appears in the video stream, the playback program differs from the normal playback method, specifying the corresponding stream, which can be specified by the VST, AST, SST parameters, for example, to play the audio and video stream in program 13, as specified by the following command line:
   Data visualization analysis Application of Ffplay-vst 4-ast 5 ~/movies/movie/chinatv-11.tsffplay
5. When playing video, experience how XXX decodes each macro block, you can use the command
   Ffplay-debug vis_mb_type-window_title "Show Vis_mb_type"-ss 20-t 10-autoexit titanic.ts
   Show Window Contents
   

In the output of the video information, you can see the different colors of the box, below to explain what these colors represent information:

2. View B-Frame prediction and P-frame prediction information by Ffplay, want to display the information in the window, use the command
   FFPLAY-VISMV PF Titanic.ts
   Show effect
   
   
   The information of P-frame motion estimation can be seen through the arrows in the graph.
   While the VISMV parameter is used to display the motion vector information when the image is decoded, the parameters can be set to display three types of motion vector information.
   
   This VISMV parameter will be replaced in the future, and in the future more is set using the Codecview filter, as above
   Image, or you can do this by following this command
   FFPLAY-FLAGS2 +export_mvs TITANIC.TS-VF CODECVIEW=MV=PF+BF+BB
   

3. When playing audio files, not sure whether the sound of the file is normal, noise data and other analysis, you can directly use Ffplay play audio files, playback will be decoded audio data in the audio waveform display:
   Ffplay-showmode 1 titanic.ts
   

Filters (Filter)

In multimedia processing, filter means a software tool that is used to modify the contents of an input file before it is encoded into an output file. For example: Video flip, rotate, zoom and so on.
Syntax: [INPUT_LINK_LABEL1] [Input_link_label1] ... filter_name=parameters [output_link_label1] [Output_link_label2] ...
Filter Diagram Link Label: is the input or output name of the tag filter

1. Video Filter-VF
   • Rotate the original video clockwise by 90 degrees
     Ffplay-i TEST.MP4-VF transpose=1
   • Flip the original video vertically
     Ffplay-i TEST.MP4-VF Vflip transpose=1
   • Overlay the following two effects
     Ffplay-i TEST.MP4-VF vflip,transpose=1
2. Audio Filter-AF
   • Fast playback with 1.5 times times the speed of the original sound
     Ffplay-i Test.mp4-af atempo=1.5

Do not complete resources available RTMP links

Hong Kong TV, RTMP://LIVE.HKSTV.HK.LXDNS.COM/LIVE/HKS (recent tests cannot be connected)
Hong Kong Finance, RTMP://202.69.69.180:443/WEBCAST/BSHDLIVE-PC
Korea GOODTV,RTMP://MOBLIESTREAM.C3TV.COM:554/LIVE/GOODTV.SDP
Korea Korea Daily, Rtmp://live.chosun.gscdn.com/live/tvchosun1.stream
United States 1,rtmp://ns8.indexforce.com/home/mystream
United States 2,rtmp://media3.scctv.net/live/scctv_800
American Chinese TV, Rtmp://media3.sinovision.net:1935/live/livestream

Multiple test code streams

http://samples.mplayerhq.hu/

Reference

Https://wenku.baidu.com/view/296eefcaf90f76c661371af1.html

More information, more sharing

Audio and video Technology Exchange Group 1 full
Audio and video Technology Exchange Group 2 full
Audio and video Technology Exchange Group 3 Group No. 782508536

FFmpeg Advanced Series 01-ffplay Command detailed