$ ffmpeg -i PoTone_Outline_FA2020week2.mp4 You can specify the following parameters to select the appropriate rate.Original video by ffmpeg (1024:768, 11.3MB) ■Scale video The default parameters of transcoding are relatively slow. # Direct transcoding # The video file is converted to h264 encoding format, and directly converted to h264 encoding formatįfmpeg -i 88885. vcodec copy Copy video without transcodingįfmpeg -i 88885. acodec copy Copy audio without transcoding ab Audio converted bit rate (Default 64 k ) -acodec Develop encoder for audio use( -codecs) r Frame rate of video conversion (Default 25 frames per second ) -b Video conversion bit rate vcodec Codec used in video conversion( -codecs) s Resolution of video after video conversion
Private static void transferToH264 (File inputFile ,File outputDir ) FFmpeg common commands and parameters -i Specify the source file to convert the video to Java call system FFmpeg command to realize transcoding / * * * Calling system command to transcode each file The following is a successful installation Test whether ffmpeg is installed successfully.# Execute the following naming for the lib library to take effect after saving and exiting # Add the following lines /usr /local /lib Modify the configuration of the system library.If you cannot find the h264 module, you should enter the following configuration items You do not need to add system variables for FFmpeg. Note: the above installation does not specify the installation path, which is the default path.
configure -enable -shared -enable -static -enable -yasm Do not specify it here, or the library will fail to find it # Execution configuration. # -prefix=/usr/local/x264 specifies the installation directory. Wget http: / //projects /yasm /releases /yasm -1. When there are few video files, we can use player software (QQ audio and video). In this paper, we use Java to call FFmpeg command to convert MPEG encoding format to H264 format. When the video file does not support video label playback, you need to use encoding tools to convert its format to a supported format. Ogg = Ogg file uses Theora video codec and Vorbis audio codec WebM = WebM files using VP8 video codec and Vorbis audio codec MP4 = MPEG4 files use H264 video codec and AAC Audio Codec
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