[book club issue 13] ffmpeg common methods for viewing media information and processing audio and video files

FFmpeg The engineering plan of

Transcoding of audio and video files is generally called multimedia processing , Huawei cloud also has corresponding media processing service 1 Media Processing Center, abbreviation MPC, It is a multimedia data processing service , Build based on Huawei cloud computing services , To solve the inevitable high investment cost of customers' self built audio and video processing capacity 、 High technical barriers , Help customers focus on building business capabilities , Fast delivery online .

1. Video processing
2. Audio processing

FFmpeg transcoding

Through the introduction of previous classes , We're right FFmpeg Have a certain understanding of multimedia processing ability .
Next , I will show you how to use FFmpeg Realize some audio and video processing functions of some Huawei cloud media processing services , Including transcoding capability 、 Video parameters 、 Three parts of audio parameters .

FFmpeg Actual demonstration

1. Audio transcoding
   ffmpeg -i XXX. mp3 -acodec aac -ab 3000 -ac 1 -ar 8000 output.aac
   Let's understand these parameters respectively ：
   -i： Input file
   -acodec: Set the audio encoding type
   -ab: Set the parameters of audio bit rate
   -ac： Set the number of channels
   -ar: Set the acquisition rate
2. Video transcoding
   ffmpeg -i XXX. mp4 -vcodec h263 -b:v 256000 -r 15 -s 352x288 -acodec copy
   output. ts
   -vcodec： Set up video encoding
   -b:v： Set video bitrate
   -r： Set video frame rate
   -s： Set video sampling rate

summary ：

Today's learning is mainly to practice the previous knowledge , You can experience it very clearly through two command lines FFmpeg A powerful , And simple applications , Look forward to applying them to work and life in the future ！ Thank you teacher ！