On Sat, Mar 02, 2019 at 11:02:03 +0100, Bouke / VideoToolShed wrote: > Next, it is dog slow, sorta kinda defeating the whole idea.
I thought the whole point was that the "receiving" ffmpeg was too fast, in relation to the processing "speed" of the sending ffmpeg. And that the "receiving" side needed a chance not to exit on EOF. The tail "pipe" shouldn't slow anything down, except that there's the disk R/W I/O involved. There could be a minor issue in "tail" processing in text mode, buffered line by line. You will find references online to a "bintail", but I am otherwise at a loss of tools which can ignore EOF. Named pipes as am alternative probably also transfer EOF. > (Since the data is piped at a speed that FFmpeg will never be able to > catch up with the original…) Huh? Gregor wrote: > 2 - Growing file generation slower than processing > ffmpeg.exe -i input.mxf growing.mkv > ffmpeg.exe -i growing.mkv -c copy output.mkv > > ffmpeg stops when it reaches the current end of the growing file. > > > > So Bouke, what's to catch up? Did you misread the original poster's request? > bouke$ ffmpeg -i /Users/bouke/Desktop/Judith/Harding.mxf -an -s 120x40 -t 15 > -y /Users/bouke/Desktop/Judith/test.mp4 You may have overlooked that /Users/bouke/Desktop/Judith/Harding.mxf is being created at a slower speed, and not an existing finalized file. > Stream #0:0 -> #0:0 (mpeg2video (native) -> mpeg4 (native)) > Press [q] to stop, [?] for help > frame= 375 fps=136 q=2.0 Lsize= 365kB time=00:00:15.00 bitrate= > 199.6kbits/s > video:363kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB > muxing overhead: 0.674411% > > vs > bouke$ tail -c +1 -F /Users/bouke/Desktop/Judith/Harding.mxf | ffmpeg -i - > -an -s 120x40 -t 15 -y /Users/bouke/Desktop/Judith/test.mp4 > Stream #0:0 -> #0:0 (mpeg2video (native) -> mpeg4 (native)) > frame= 375 fps= 28 q=2.0 Lsize= 365kB time=00:00:15.00 bitrate= > 199.5kbits/s dup=1 drop=0 > video:363kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB > muxing overhead: 0.674757% 28 vs 136 fps is certainly peculiar. Moritz _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
