For example: ffmpeg -i INPUT -map 0:1 out. You can use '-map' to select which streams to place in an output file. No other streams will be included in this output file. I assumed that -map_chapters 3 would take the 4th input (the chapters file) and just copy it over to both outputs, but when I inspect the encoded files there is no metadata stream for the chapter marks. For example, to map ALL streams from the first input file to output ffmpeg -i INPUT -map 0 output For example, if you have two audio streams in the first input file, these streams are identified by 0:0 and 0:1. The -map 1:a option will select all audio streams from the second input B.mp4. f tee "output_stereo.mkv|output_5.1.mkv" map 0:v -map 1:a -c:a copy -map 2:a -c:a copy -map_chapters 3 \ Map in FFmpeg can be best understood as selecting streams within a file you want to encode, keep or remove when creating an output.-map is the command. Here is what I am trying to map: video.mov -> output_stereo.mkvĪnd here's my FFMPEG command: -i video.mov -i stereo.wav -i 5.1.wav -i chapters.txt \ Because the video file only needs to be encoded once I am using tee muxing for efficiency, however this means I need to explicitly map my streams and for some reason the chapters stream seems to be getting lost. The tee pseudo-muxer was added to ffmpeg on, and allows you to duplicate the output to multiple files with a single instance of ffmpeg. You don't want to encode twice, that wastes cpu. Tada, you should have a new version of your video with the randomly chosen music looping for the duration of the video.ĭid you find this information useful? If so, consider heading over to my donation page and drop me some support.I am trying to encode 2 video files from: 1 source video, 2 source audio files, and 1 source chapter marks file. For example, when you are streaming a live audio/video and want to save a duplicate of that stream into the file at the same time. The audio stream technically never ends since it loops forever.
The byte at offset START will be the first byte in the output. ffmpeg -f data -start START -end END -i subfile:/path/to/file -map 0 -c copy -f data segX.mp4. amovie=$bgm:loop=0,volume=0.03 - this loads the randomly chosen music file to make its audio stream available and with the loop argument set to 0, loops it indefinitely. Using ffmpeg to split files is unusual but it can be done.I'll talk about the important parts of this FFmpeg command.We get the music file to load in using the random_music script and save it for later.The directory you want to pick the random music from.map 0:v -map "" -shortest -c:v copy "$output" Time for the FFmpeg magic: #!/usr/bin/env sh I write the output of all that to a text file for reference later, as well as using head to list that file to stdout.With the -n 1 flag, it will output only the first line I pipe that output to shuf, which randomizes the list of files. FFmpeg is a multiplatform, open-source library to record, convert and stream video and audio files, it supports nearly every digital format and codec known, it’s available on most.Just make sure each output file (or stream), is preceded by the proper output options. I list out of contents of that directory using find From FFMpeg documentation, FFmpeg writes to an arbitrary number of output 'files'.For this, I wrote a simple script: #!/usr/bin/env sh To convert the RTSP live stream into hls the command is ffmpeg There are three output files specified, and for the first two, no -map options are set. I wanted to pick a random music file from a directory for the first part and use it later.
The music I use for this is from a project called StreamBeats, you should check it out. Naturally, I turn to my weapon of choice in these cases, FFmpeg. So recently I decided to try adding some background music to my videos so it isn't just me blathering the whole time.
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