normalize multiple video files ffmpeg os x

NORMALIZE MULTIPLE VIDEO FILES FFMPEG OS X HOW TO
NORMALIZE MULTIPLE VIDEO FILES FFMPEG OS X INSTALL
NORMALIZE MULTIPLE VIDEO FILES FFMPEG OS X WINDOWS

Meaning key frames will be set in the exact same positions to allow smooth switching between them on the fly. It's very important that besides the resolution and bitrate parameters the commands will be identical so that the renditions will be properly aligned, Multiple renditions ¶Įach rendition requires its own parameters, though ffmpeg supports multiple inputs and outputs so all the renditions can be generated in parallel with one long command. This will generate a VOD HLS playlist and segments in beach folder. beach/720p.m3u8 - path of the playlist file - also tells ffmpeg to output HLS (.-hls_segment_filename beach/720p_%03d.ts - explicitly define segments files names.

-hls_playlist_type vod - adds the #EXT-X-PLAYLIST-TYPE:VOD tag and keeps all segments in the playlist.

-hls_time 4 - segment target duration in seconds - the actual length is constrained by key frames.

-b:v 2500k -maxrate 2675k -bufsize 3750k - limit video bitrate, these are rendition specific and depends on your content type - read more.

-sc_threshold 0 - don't create key frames on scene change - only according to -g.

-g 48 -keyint_min 48 - IMPORTANT create key frame (I-frame) every 48 frames (~2 seconds) - will later affect correct slicing of segments and alignment of renditions.

-crf 20 - Constant Rate Factor, high level factor for overall quality.

-profile:v main - set H264 profile to main - this means support in modern devices read more.

-c:v h264 - set video codec to be H264 which is the standard codec of HLS segments.

-c:a aac -ar 48000 -b:a 128k - set audio codec to AAC with sampling of 48kHz and bitrate of 128k.

-vf 'scale=w=1280:h=720:force_original_aspect_ratio=decrease' - scale video to maximum possible within 1280x720 while preserving aspect ratio.

-i beach.mkv - set beach.mkv as input file.

NORMALIZE MULTIPLE VIDEO FILES FFMPEG OS X INSTALL

Run brew install ffmpeg (extra options can be seen by running brew options ffmpeg)įfmpeg -i beach.mkv -vf scale=w=1280:h=720:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -b:a 128k -c:v h264 -profile:v main -crf 20 -g 48 -keyint_min 48 -sc_threshold 0 -b:v 2500k -maxrate 2675k -bufsize 3750k -hls_time 4 -hls_playlist_type vod -hls_segment_filename beach/720p_%03d.ts beach/720p.m3u8.

ffmpeg - you should see ffmpeg version and build information

Open a command prompt in the unzipped folder.

NORMALIZE MULTIPLE VIDEO FILES FFMPEG OS X WINDOWS

Installing FFMPEG ¶įfmpeg is a cross platform program that can run on Windows and OS X as well as Linux. In this guide will show a real world use of ffmpeg to create MBR HLS VOD stream from a static input file. The video with different resolutions and bitrates that can be switched seamlessly, this concept is called MBR (Multi Bit Rate).Ī powerful tool that supports conversion of various video formats from one to another, including HLS both as input and output. Since end users have different screen sizes and different network performance, we want to create multiple renditions of HLS is one of the most prominent video streaming formats on desktop and mobile browsers. Setting up HLS live streaming server using NGINXĬreating A Production Ready Multi Bitrate HLS VOD stream ¶

NORMALIZE MULTIPLE VIDEO FILES FFMPEG OS X HOW TO

How to enable and disable P2P connections programmatically How to add a Custom Label to the analytics Creating A Production Ready Multi Bitrate HLS VOD stream

Normalize multiple video files ffmpeg os x