On Wed, Nov 15, 2017 at 10:48 AM Carl Eugen Hoyos <[email protected]> wrote:
> 2017-11-15 4:58 GMT+01:00 Roman Puttkammer <[email protected]>: > > I did run into another issue; though the frame rate 320/240 @ 120fps is > set > > successfully, ffmpeg reports only 30+ fps later on. > > Please test without encoding to analyse whether this is a performance > issue: > $ ffmpeg -f avfoundation -video_size 320x240 -r 120.101366 -pixel_format > uyvy422 > -i "0:none" -f null - > > The status line will tell you the actual reading speed. > Carl - thanks. Running the test, the status line says fps=34 and speed 0.297 (see below.) What are the hardware bottlenecks? It doesn't seem to be the CPU which remains 90% or more idle. (I noticed you suggested -r 120 as opposed to -framerate 120. If I use -framerate, fps remains similar but the speed shows a value > 1.) *Romans-MBP:ffmpeg putt$ ffmpeg/ffmpeg -f avfoundation -video_size 320x240 -r 120.101366 -pixel_format uyvy422 -i "0:none" -f null -* Input #0, avfoundation, from '0:none': Duration: N/A, start: 1748.307600, bitrate: N/A Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 320x240, 33 tbr, 1000k tbn, 1000k tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: encoder : Lavf58.2.100 Stream #0:0: Video: wrapped_avframe, uyvy422, 320x240, q=2-31, 200 kb/s, 120.10 fps, 120.10 tbn, 120.10 tbc Metadata: encoder : Lavc58.3.101 wrapped_avframe *frame= 311 fps= 36 q=-0.0 size=N/A time=00:00:02.58 bitrate=N/A speed=0.297x * _______________________________________________ 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".
