ffmpeg Chinese parameter description and usage examples

1. When ffmpeg pushes video files, the encoding formats of audio and video can only be H264 and AAC.

ffmpeg -re -i "E:\片源\Avengers 720p.mov" -vcodec copy -acodec copy -f flv rtmp://192.168.11.75/live/test1
ffmpeg -re -i "E:\片源\Avengers 720p.mov" -vcodec copy -acodec copy -f flv rtmpt://192.168.11.75:8080/live/test1

2. IP camera rtsp streaming push rtmp live broadcast (but there is packet loss, please give more advice)

ffmpeg -i rtsp://ip address/original -crf 30 -preset ultrafast -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 96k -vcodec libx264 -r 25 -b:v 500k -s 640*480 -f flv rtmp://ip address/live/stram

ffmpeg parameter description:

Basic options:
-formats	Export to all available formats
-f fmt	Specify the format (audio or video format)
-i filename	Specify the input file name. In Linux, you can also specify: 0.0 (screen recording) or camera
-y	Overwrite existing files
-t duration	The recording time is t
-fs limit_size	Set a maximum file size
-ss time_off	Starting from the specified time(s), the format of [-]hh:mm:ss[.xxx] is also supported
-itsoffset time_off	Set the time offset (s). This option affects all subsequent input files. The offset is added to the input file's timestamp, defining a positive offset means that the corresponding stream is delayed by offset seconds. [-]hh:mm:ss[.xxx] format is also supported
-title string	title
-timestamp time	Timestamp
-author string	author
-copyright string	Copyright Information
-comment string	Comment
-album string	album name
-v verbose	Log related
-target type	Set the target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd", "ntsc-svcd", ...)
-dframes number	Set the number of frames to record
Video Options:
-b	Specify the bit rate (bits/s). It seems that ffmpeg is automatically VBR. If you specify it, it will be the average bit rate.
-bitexact	Use standard bitrate
-vb	Specify the video bit rate (bits/s)
-vframes number	Set the number of frames of video to convert
-r rate	Frame rate (fps) (can be changed, but non-standard frame rates will cause audio and video to be out of sync, so it can only be set to 15 or 29.97)
-s size	Specify resolution (320x240)
-aspect aspect	Set video aspect ratio (4:3, 16:9 or 1.3333, 1.7777)
-croptop size	Set the top cutoff size (in pixels)
-cropbottom size	Set bottom cutoff size (in pixels)
-cropleft size	Set the left cutoff size (in pixels)
-cropright size	Set the right cutoff size (in pixels)
-padtop size	Set the top padding size (in pixels)
-padbottom size	Bottom padding (in pixels)
-padleft size	Left padding (in pixels)
-padright size	Right padding (in pixels)
-padcolor color	Fill in the color (000000-FFFFFF)
-vn	Cancel Video
-vcodec codec	Force the use of codec encoding and decoding mode ('copy' to copy stream)
-sameq	Use the same video quality as source (VBR)
-pass n	Select the number of passes (1 or 2). Two-pass encoding is very useful. The first pass generates statistics, the second pass generates the exact requested bitrate
-passlogfile file	Select the two recorded files named file
-newvideo	Add a new video stream after the current video stream

Advanced Video Options
-pix_fmt format	set pixel format, 'list' as argument shows all the pixel formats supported
-intra	Only available for intraframe coding
-qscale q	VBR based on <value> quality, 0.01-255, lower quality is better
-loop_input	Set the number of loops for the input stream (currently only valid for images)
-loop_output	Set the number of loops for the output video. For example, when outputting GIF, set it to 0 for infinite loops.
-g int	Set the group of images size
-cutoff int	Set the cutoff frequency
-qmin int	Set minimum quality, used together with -qmax (set maximum quality), e.g. -qmin 10 -qmax 31
-qmax int	Set Maximum Quality
-qdiff int	Maximum deviation between quantizer scales (VBR)
-bf int	Use frames B frame, support mpeg1, mpeg2, mpeg4
Audio Options:
-ab	Set the bit rate (unit: bit/s, maybe kb/s in the old version). When -ac is set to stereo, set it to half the bit rate, for example, 192kbps is set to 96. The default bit rate for conversion is relatively small. If you want to hear higher quality sound, it is recommended to set it to above 160kbps (80).
-aframes number	Set the number of frames of audio to convert
-aq quality	Set audio quality (specify encoding)
-ar rate	Set the audio sampling rate (unit: Hz), PSP only recognizes 24000
-ac channels	Set the number of channels, 1 is mono, 2 is stereo. To convert a mono TVrip, you can use 1 (saving half the capacity), and a high-quality DVDrip can use 2.
-an	Cancel Audio
-acodec codec	Specify audio encoding ('copy' to copy stream)
-vol volume	Set the recording volume (default is 256) <percentage>. Some DVDrip AC3 tracks have very low volume. You can use this to increase the volume when converting. For example, 200 means twice the original volume.
-newaudio	Add a new audio stream after the current audio stream
Subtitle options:
-sn	Cancel subtitles
-scodec codec	Set subtitle encoding ('copy' to copy stream)
-newsubtitle	Add after the current subtitle
-slang code	Sets the ISO 639 code used for subtitles (3 letters)
Audio/Video Capture Options:
-vc channel	Set the video capture channel (DV1394 only)
-tvstd standard	set up

Convert to flv:
ffmpeg -i test.mp3 -ab 56 -ar 22050 -b 500 -r 15 -s 320x240 test.flv
ffmpeg -i test.wmv -ab 56 -ar 22050 -b 500 -r 15 -s 320x240 test.flv

Convert the file format and capture the thumbnail at the same time:
ffmpeg -i "test.avi" -y -f image2 -ss 8 -t 0.001 -s 350x240 'test.jpg'

To capture an existing flv:
ffmpeg -i "test.flv" -y -f image2 -ss 8 -t 0.001 -s 350x240 'test.jpg'

Convert to 3gp:
ffmpeg -y -i test.mpeg -bitexact -vcodec h263 -b 128 -r 15 -s 176x144 -acodec aac -ac 2 -ar 22500 -ab 24 -f 3gp test.3gp
ffmpeg -y -i test.mpeg -ac 1 -acodec amr_nb -ar 8000 -s 176x144 -b 128 -r 15 test.3gp

The above is the ffmpeg Chinese parameter description and usage examples. For more related articles, please click the following related links

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