CODEWITHSUNDEEP
ffmpeg
Nader
Nader

Reputation: 45

FFMPEG Video Multiplexer

I am a DirectShow developer, I used to build multiplexers that take 2 video inputs and generate one output, I would then use a video encoder mux to feed it the output + anothrr audio stream to generate the final video output. The multiplexer (DirectShow framework) allows me to process the input video from two sources (for example, adding effects using the two frames).

How can this can be done using FFMPEG?

Upvotes: 0

Views: 3529

Answers (1)

llogan
llogan

Reputation: 134173

Since your question is very vague I will provide three "solutions".

Muxing

Muxing streams from various inputs is easy. This example will stream copy all video streams from input0.mkv, all video streams from input1.mp4, and all audio streams from input2.oga. The resulting output file will have at least 2 video streams and at least 1 audio stream. The exact number of streams in the output depends on the number of streams present in the inputs.

ffmpeg -i input0.mkv -i input1.mp4 -i input2.oga -map 0:v -map 1:v -map 2:a -c copy -shortest output.mkv

Also see:

Concatenating

If you want to concatenate the video streams and add an audio stream you can use the concat filter or the concat demuxer. Here's a basic example using the concat filter:

ffmpeg -i video0.webm -i video1.mp4 -i audio.wav -filter_complex \
"[0:v][1:v]concat=n=2:v=1:a=0[v]" -map "[v]" -map 2:a output.mkv

See FFmpeg Wiki: Concatenate for more examples.

Concatenating with additional filtering

ffmpeg -i video0.webm -i video1.mp4 -i audio.wav -filter_complex \
"[0:v]scale=1280:-2,vflip,setpts=PTS-STARTPTS[v0]; \
 [1:v]fps=25,curves=preset=increase_contrast,setpts=PTS-STARTPTS[v1]; \
 [v0][v1]concat=n=2:v=1:a=0[v]" \
-map "[v]" -map 2:a output.mkv

  • The first filterchain will scale, vertically flip, and set timestamp to 0 for the first video input.

  • The second filterchain will set the frame rate to 25, apply curves, and set timestamp to 0 for the second video input.

  • The third filterchain concatenates the filtered videos.

Upvotes: 1

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