On Sat, 2 Mar 2019, Bouke / VideoToolShed wrote:
Bouke
www.VideoToolShed.com
van Oldenbarneveltstraat 33
6512 AS Nijmegen
+31 6 21817248
To send files, go here:
https://videotoolshed.wetransfer.com/
On 26 Feb 2019, at 13:20, Moritz Barsnick <[email protected]> wrote:
On Tue, Feb 26, 2019 at 11:00:40 +0100, [email protected] 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.
Any way to avoid this behavior ?
My second recommendation with "tail" here works for me:
https://lists.ffmpeg.org/pipermail/ffmpeg-user/2016-July/032874.html
<https://lists.ffmpeg.org/pipermail/ffmpeg-user/2016-July/032874.html>
Hi Moritz,
Great trick, works here too, except that it of course never stops.
So, it’s either telling FFmpeg how long the file ‘should’ be, or do a 'pkill
tail'.
Is there a more sophisticated way?
Next, it is dog slow, sorta kinda defeating the whole idea.
(Since the data is piped at a speed that FFmpeg will never be able to catch up
with the original…)
bouke$ ffmpeg -i /Users/bouke/Desktop/Judith/Harding.mxf -an -s 120x40 -t 15
-y /Users/bouke/Desktop/Judith/test.mp4
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%
Another approach is to use -rw_timeout 1000000 and -follow 1 options.
Stangely the 'follow' option is documented under the ftp protocol when it
in fact applies to the file protocol...
Regards,
Marton
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