Hi I am successfully recording videos from my webcam using ffmpeg under windows with the Direct Show source type with the following command line:
ffmpeg -f dshow -video_size 640x360 -rtbufsize 4MB -framerate 30 -pixel_format yuyv422 -i video="Logitech BRIO" out.mp4 All is working nicely, however I encountered the following problem: since the ffmpeg command line is launched, the webcam takes some time (around 2-3 seconds) to start streaming. I know that this is a limitation that depends on the webcam way of functioning / driver, since this will happen with any other software accessing it (e.g. Skype). The thing is that I would need video recording start to be as fast as possible since the command line is started. I was thinking that a possible solution would be to use a first instance of ffmpeg to read the webcam, keeping it running and continuously "streaming" it to a second ffmpeg instance that could then access the live stream of data only when needed. I thought that in this way webcam video recording startup delay would be eliminated or greatly reduced. A note: I need to record more than one video, so I would let instance 1 always run, and only launch instance 2 when I want to record a new video. So, my question are the following: 1. is such two "ffmpeg instances" configuration possible? 2. if so, what is the most efficient way to stream / pipe the video data from instance 1 (hot webcam) to instance 2 (save to disk) with minimal video quality loss? Thanks for your help! Regards -- Mathieu Bosi www.mathieubosi.com _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
