On 03/24/2016 05:28 PM, Moritz Barsnick wrote:
On Thu, Mar 24, 2016 at 17:05:06 -0600, jd1008 wrote:
ffmpeg -i The_Previous_River_Trip.mp4 -s:v:1 1920x1080 -vcodec
mpeg1video -q:v 1 -y The_Previous_River_Trip.mp4
If you have only one video output, you are fine with just "-s
1920x1080".
warning, clipping 1 dct coefficients to -255..255:02:37.06
bitrate=66271.0kbits/s
[mpeg1video @ 0xa618f00] warning, clipping 1 dct coefficients to -255..255
That has nothing to do with a "physical" clipping of the scale, this is
a mathematical clipping in the mpeg1video encoder. (It may or may not
lead to visual impact.) I haven't seen this for a while, but I can
hardly recall when I used mpeg1video. ;-) I couldn't find a source for
this info, but remember it from "way back when", that changing the
macroblock decision algorithm may get rid of these warnings: Add "-mbd
rd" as an output option. (I just tried, it works for me.) So replace
[...] -s 1920x1080 -c:v mpeg1video -q:v 1 [...]
with
[...] -s 1920x1080 -c:v mpeg1video -q:v 1 -mbd rd [...]
I can't guarantee though that you won't still get one or the other
warning...
Moritz
_________________
Thanx a lot!!!
It does work :) :)
Reason I am transcoding into mpeg1 is because the apps that create the
DVD format for playback on regular DVD's
take them way freaking too long to do the transcoding to mpeg1 (and that
is what they do to every video I try to
convert to DVD using the dvd creation apps.
ffmpeg seems to do it a lot faster.
So, when is ue these apps and the input video is already in mpeg1
format, they just proceed to create the
DVD format without transcoding.
Cheers,
JD
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