Recording MP4 files with webcam using FFmpeg
Context
This article explains how to record MP4 files using a webcam with FFmpeg. The command provided records video using the video4linux2 driver, with the MJPEG video codec, a video size of 1280x720, and saves the output as an MP4 file.
Command
ffmpeg -f video4linux2 -vcodec mjpeg -video_size 1280x720 -i /dev/video0 -falsa -ac1 -ihw:2 -g 64 -movflags frag_keyframe+empty
Explanation
The command uses the FFmpeg media player and streamer to record video from the webcam. The -f video4linux2 option specifies the video4linux2 driver to capture video. The -vcodec mjpeg option sets the video codec to MJPEG. The -video_size 1280x720 option sets the video size to 1280x720 pixels. The -i /dev/video0 option specifies the device node for the webcam. The -falsa option enables audio input from the ALSA sound card. The -ac1 option sets the audio codec to AC3. The -ihw:2 option enables hardware acceleration for H.264 and MPEG-4 video encoding. The -g 64 option sets the GOP size (group of pictures) to 64 frames. The -movflags frag_keyframe+empty option sets the MP4 file format and enables empty keyframes.
References
- FFmpeg documentation: https://ffmpeg.org/documentation.html
- Video4Linux documentation: https://www.linuxtv.org/downloads/v4l-dvb-apis/v4l-core-api/
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