Now that we have the commands to transcode a video into multiple bitrate variants, let’s start creating HLS VOD Playlists FFmpeg. Creating HLS Playlists (m3u8) using FFmpeg Now, we move on to the next step which is to create an HLS m3u8 playlist file for each of the renditions/variants. Importantly, we have set the -keyint_min value to 48 which should force a keyframe periodically as this is very important in ABR streaming. You can choose between a combination of presets, crf values, CBR settings, etc. There are probably a zillion ways to transcode your videos using FFmpeg. I’ve used some simple parameters to mimic a CBR encode in this example. Note: You can also choose your own encoding parameters and modify it to your liking and requirements. map -c:v:2 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v:2 1M -maxrate:v:2 1M -minrate:v:2 1M -bufsize:v:2 1M -preset slow -g 48 -sc_threshold 0 -keyint_min 48 \Ĭan you see what’s been done here? We have taken the three variables, , and as our inputs and transcoded each of the inputs using libx264‘s slow preset, and at the desired bitrates. Let’s use those directly as inputs for the transcoding step. Remember, that we have already scaled the video at the required resolutions and stored the output in, , and. Next, we move on to Steps 3 & 4 – we have to transcode the video to multiple bitrates as is typically done for ABR Video Streaming. Transcode a Video to Multiple Bitrates for HLS Packaging using FFmpeg For more on this topic, please check our tutorial on resizing and scaling videos using FFmpeg. Else, you can force it and apply letterboxing if necessary. Note, here we are assuming that the scaling process is going to retain the aspect ratio. Here, we are scaling the input video to 1080p, 720p, and 360p.Īnd,, , are variables that contain the output of the scaling process. Each of these are taken as inputs to a scaling function in FFmpeg that accepts a height and width number. In our case, there is only one video stream and this is split into 3 outputs.
refers to the input file’s first video stream. This can be done in a single command as follows – ffmpeg -i brooklynsfinest_clip_1080p.mp4 \ Okay, Step 1 and 2 involve reading a video from disk and scaling it to multiple resolutions. Now, let’s tackle this step by step, shall we? Resize a Video to Multiple Resolutions using FFmpeg create a master playlist that points to each of the variants.combine the video and audio, package each combination, and create the individual TS segments and the playlists.transcode the audio to the required bitrates.transcode each of the scaled videos to the required bitrates.scale/resize the video to the multiple resolutions required.Okay, let’s see what the fundamental steps to packaging a VOD file using HLS are, shall we? Other useful HLS Packaging options in FFmpegīasic Steps to HLS Packaging using FFmpeg.Final Script for HLS Packaging using FFmpeg – VOD.Create an HLS Master Playlist (m3u8) using FFmpeg.Creating HLS Playlists (m3u8) using FFmpeg.Transcode a Video to Multiple Bitrates for HLS Packaging using FFmpeg.Resize a Video to Multiple Resolutions using FFmpeg.Basic Steps to HLS Packaging using FFmpeg.NAB Show New York to Feature 230+ Exhibitors 32 First-Time ExhibitorsĪstro Malaysia goes live with Synamedia Clarissa for business insights clarity
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