Are we really speaking about the same thing, generating multiple tracks in a QuickTime movie, and not a track with 4 overlays or a multi-channel (audio) track? May I ask what the name of the filter is that merges the crop filter outputs in 4 tracks in a single output (not overlay, not amerge ... I must have overlooked the relevant one)?
For reference, what I'm doing now is create a pipe to ffmpeg -y -v 1 -i - -vf crop=360:288:0:0 -b:v 500k -vcodec mjpeg cam1.mov -vcodec mjpeg -vf crop=360:288:360:0 -b:v 500k cam2.mov -vf crop=360:288:0:288 -vcodec mjpeg -b:v 500k cam3.mov -vf crop=360:288:360:288 -vcodec mjpeg -b:v 500k cam4.mov to generate single-track 4 quicktime movies from an m4v 4000kbit/s stream that contains the recorded output of 4 cameras, in 'quad' arrangement. I then combine those 4 movies into a single QuickTime movie with 4 tracks using QuickTime SDK functions. NB: at 12Hz there isn't much gain of mpeg4 encoding over mjpeg encoding, which however plays back much smoother on a wider range of hardware. René On Dec 07, 2012, at 13:19, Carl Eugen Hoyos wrote: > René J.V. Bertin <rjvbertin@...> writes: > >> I discovered yesterday that it's possible to split an input >> movie (a raw m4v stream) into 4 separate output movies (.mov) >> each containing a quarter of the original image (obtained with >> -vf crop=w/2:h/2:x:y), using a single invocation of ffmpeg. >> Is it possible to generate a single output movie with 4 >> tracks instead > > The complex filter allows this, please RTFM for examples. > > Carl Eugen _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
