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Which is the best FFmpeg configuration for video recording?
-ac 1 : this is audio channels 2–> (stereo), 1–> (mono) try until you find what best for you. -ar 44100 : audio sampling rate 44.1KHz, you may change it as you want. -t 15 : this to record only 15 seconds, you may change it or remove it.
How to sync audio and video from Raspberry Pi?
Note it is perhaps wiser to have all the processes in a single pipe ( raspivid | ffmpeg) and ffmpeg read ALSA as well ( -f alsa -i hw:1,0 ). Thanks for contributing an answer to Raspberry Pi Stack Exchange!
Why is my Raspberry Pi camera out of sync?
The audio & video are grossly out of sync. I have tried changing the framerates on both raspivid & ffmpeg with no success. Not sure what piece of the puzzle i am missing. The problem is that the raspberry pi camera module does not, in fact, produce 25 frames per second.
How can I capture audio and video simultenaous?
You can use in terminal to see what video capture devices your OS has set up. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers.
What are the threads in the ffmpeg command line?
The -threads 4 option does what you think, it uses 4 threads. The -i udp://239.255.12.42:6666 connects to the stream we are broadcasting. The -map 0 tells ffmpeg that we need all streams (both video and audio). The -acodec copy and -vcodec copy are there to ensure that the streams are taken as is, instead of doing any compression/transcoding.
How often does FFmpeg go out of sync?
Sometimes it may be out of sync by a tiny amount like 0.150 seconds, but it makes all the difference in the world when you get it correct. Trial and error is the only way I know to get it, so working with a 1 minute clip instead of the whole video you can get a fast answer.
What are the switches in the FFmpeg program?
The ffmpeg program has numerous “switches” that help to adjust and convert audio and video files. Some of them are not explained very well in the documentation, and many websites have confusing postings by well-meaning people trying to make use of the switches.