FFmpeg v6.1 official version

7 tips for ffmeg:

1.Audio conversion

ffmpeg -i my_audio.wav my_audio.mp3 -i is the audio file to be converted, and my_audio.mp3 is the destination audio file.

2.video conversion

ffmpeg -i my_video.mpeg -s 500×500 my_video.flv -i is the source video file, -s means setting the resolution of the target video file and my_video.flv is the destination video file.

3. From the videointerceptpicture

ffmpeg -i test.mpg image%d.jpg intercepts 25 pictures per second by default. You can set the number of pictures intercepted per second through -r.

-r fps sets the frame rate, which is the number of pictures captured per second (default 25)

ffmpeg -i test.mpg -r 1 image%d.jpg captures 1 picture every 1 second

You can also set the interception interval, starting and ending

-ss sets the time position, syntax: hh:mm:ss[.xxx]

-t duration: limit the time for transcoding/capturing video, syntax: hh:mm:ss[.xxx]

ffmpeg -i test.mpg -r 25 -ss 00:00:10 -t 00:00:05 images%05d.png starts at the 10th second and intercepts 5 seconds of pictures at a rate of 25 pictures per second.

4. Capture audio from video

ffmpeg -i video.avi -f mp3 audio.mp3-f force format selection

ffmpeg -i video.avi -vn audio.mp3-vn cancels video interception (that is, only outputs audio files)

5. Create screencasts

ffmpeg -f x11grab -r 25 -s wxga -i :0.0 /tmp/outputFile.mpg0.0 Is this the screen display number of your X11 server? It is the same as DISPLAY.

This command intercepts wxga screen video at a rate of 25 frames per second. Of course, you can use -s to set the video resolution. The output file is /tmp/outputFile.mpg

6. Make videos with pictures

ffmpeg -f image2 -i img%d.jpg /tmp/a.mpg

Convert image files arranged in this order like `img001.jpg', `img002.jpg' into videos

7. Capture video from webcam

ffmpeg -f video4linux2 -s 320x240 -i /dev/video0 out.mpg

Capture audio and video simultaneously:

ffmpeg -f oss -i /dev/dsp -f video4linux2 -s 320x240 -i /dev/video0 out.mpg

/dev/video0 is the video device /dev/dsp is the audio device

ffmpeg software features1.FFmpeg is a set of open source computer programs that can be used to record, convert digital audio and video, and convert them into streams. FFmpeg operates under the LGPL or GPL license. FFmpeg provides a complete solution for recording, converting and streaming audio and video. FFmpeg includes the very advanced audio/video codec library libavcodec. In order to ensure high portability and codec quality, many codes in libavcodec were developed from scratch.

2.FFmpeg is developed under the Linux platform, but FFmpeg can also be compiled and run in other operating system environments, including Windows, Mac OS X, etc. This project was first initiated by Fabrice Bellard and was mainly maintained by Michael Niedermayer from 2004 to 2015. Many FFmpeg developers come from the MPlayer project, and currently FFmpeg is also placed on the server of the MPlayer project team. The name of the project comes from the MPEG video coding standard, with the "FF" in front of it standing for "Fast Forward".

3.FFmpeg is an LGPL open source program under Linux, and compilation under Windows requires special tools. The version I provide here is compiled with MinGW and has only one executable file that can be run directly (command line program).

Convert FLV to other formats (avi(mpeg4), asf, mpeg)The easy way:

(Required within round brackets, optional within square brackets)

1.Convert to wmv/asf

ffmpeg -i (full path to the flv file to be converted) -f asf -vcodec (wmv1 or wmv2) [-b video bitrate] -acodec mp3 [-ab audio bitrate] (full path to the output asf/wmv file)

2.Convert to mpeg1

ffmpeg -i (full path to the flv file to be converted) -f mpeg -vcodec mpeg1video [-b video bitrate] -acodec mp2 [-ab audio bitrate] (full path to the output mpg file)

4.Convert to avi (msmpeg4)

ffmpeg -i (full path to the flv file to be converted) -f avi -vcodec (msmpeg4 or msmpeg4v1 or msmpeg4v2) [-b video bitrate] -acodec mp3 [-ab audio bitrate] (full path to the output avi file)

Features

The multimedia video processing tool FFmpeg has very powerful functions, including video capture, video format conversion, video capture, adding watermarks to videos, etc.

Video capture function

The ffmpeg video capture function is very powerful. It can not only capture images from a video capture card or USB camera, but also perform screen recording. It also supports streaming video in RTP mode to a streaming media server that supports RTSP, supporting live broadcast applications.

ffmpeg video collection under Linux

On the Linux platform, ffmpeg provides good support for V4L2 video devices, such as:

./ffmpeg -t 10 -f video4linux2 -s 176*144 -r 8 -i /dev/video0 -vcodec h263 -f rtp rtp://192.168.1.105:5060 > /tmp/ffmpeg.sdp

The above command means: capture 10 seconds of video, capture the video4linux2 video device, capture QCIF (176*144) video, 8 frames per second, the video device is /dev/video0, the video encoding is h263, and the output format is RTP. The IP address and port are defined later, the SDP file corresponding to the code stream is redirected to /tmp/ffmpeg.sdp, and the SDP file is uploaded to the streaming media server to achieve live broadcast.

ffmpeg video collection under windows

There is very little information about ffmpeg video capture under Windows, but ffmpeg still supports video capture under Windows. ffmpeg supports video capture for video for windows (VFW) devices under Windows. However, VFW devices are outdated and are being replaced by WDM video devices. However, ffmpeg has no plans to support WDM yet, but there seems to be a tool to convert WDM to VFW. Therefore, ffmpeg can still capture videos under windows.

1.SeeVideo format conversion function

ffmpeg video conversion function. Video format conversion, for example, can convert multiple video formats to flv format, but not video signal conversion.

ffmpeg can easily convert between multiple video formats (wma, rm, avi, mod, etc.). For example, it can convert recorded video avi to the flv format used by video websites.

2.SeeVideo screenshot function

For the selected video, capture a thumbnail at the specified time. Capture video to obtain static images and dynamic images. Capturing gif files is not recommended because the captured gif files are large and playback is not smooth.

3.Add watermark function to video

Add watermark (logo) to video using ffmpeg.

FAQ

1. Video format is incompatible

Problem description: The video format you are trying to process or splice is not supported by FFmpeg.

Solution:

Use FFmpeg for format conversion to convert all videos to FFmpeg supported formats, such as MP4, AVI, etc.

2. Codec mismatch

Problem description: The video uses a codec that is not supported by FFmpeg.

Solution:

Use FFmpeg for codec conversion to convert all videos to FFmpeg supported codec formats.

3. Resolution and frame rate are inconsistent

Problem description: The resolution and frame rate of the spliced ​​video are inconsistent, which may cause black edges, deformation, or abnormal playback speed in the resulting video.

Solution:

Use FFmpeg to adjust the resolution and frame rate of the video to make it consistent before splicing.

4. Timestamps are not continuous

Problem description: The spliced ​​video timestamps are discontinuous, which may cause frame skipping or freezing in the resulting video.

Solution:

Use FFmpeg to recalculate timestamps or use pts filter to adjust so that all video timestamps are continuous.

5. The screen flickers or trembles

Problem description: The processed video appears to flicker or shake.

Solution:

Re-encode using FFmpeg to unify all videos to the same encoding parameters.

ffmpeg software update logA new major version is now available! Some highlights:

AudioToolbox output device

        MacCaption Splitter

PGX decoder

​ AV1 encoding supports SVT-AV1

Cineform HD Encoder

ADPCM Argonaut Game Encoder

                    Argonaut Games ASF Multiplexer

​​ AV1 low-overhead demultiplexer

​ ​ RPZA Video Encoder

Through librist’s RIST protocol

We strongly recommend that users, resellers and system integrators upgrade unless they are using current git master