Hi,
I was a bit too much enthusiastic about this speed thing.
The resizing and clipping options of course don't have the same purpose.
But generally -B is faster than -X (shrinking is faster than expanding).
I would love too know if there is a way to speed up the resizing thing or the
deinterlacing. I get totaly insane with the slowness of the encoding (And I
have a amd64 Athlon 3200+). I encode with xvid4 (with speed optimisations for
amd64), deinterlace option 3 (the slowest) and lots of resizing as you could
see in the previous message. I don't get more than 13 fps.
Without all the resizing and deinterlacing stuff I get 31 fps.
With the resizing and without deinterlacing i get 19 fps.
How can I speed up transcode.
Does anyone get more fps out of transcode having about the same options and
the same Computer (or of course a slower computer. Would be funny if a Athlon
1800+ could beat the 3200+ just using better commandlineswitches.)
Thank you!
On Sunday 28 May 2006 22:59, Marschall Kurt wrote:
> Hello,
>
> I have to resize DVB-T Streams so that they still look the same (have the
> same aspect ratio and Resolution as the original stream) after the
> transcoding. For some reason Transcode always meddles with the original
> resolution.
>
> The DVB-T Stream looks good, and after transcoding it it is distorted
> (streched or whatever).
>
> I retrieve the aspect ratio and the resolution with tcprobe.
> Then I use the following appropriate resizing options (found out by mere
> trying what looks best):
>
> _ASPECTRATIO=$(tcprobe -i "$1.vob" | grep aspect\ ratio: | awk -F: 'BEGIN
> {FS=" "} {print $3}' | sed 's/^ *\(.*\) *$/\1/')
> _FRAMESIZE=$(tcprobe -i "$1.vob" | grep frame\ size: | awk -F: 'BEGIN
> {FS=""} {print $5}' | sed 's/^ *\(.*\) *$/\1/')
>
> 720:576 aspect ratio 16:9:
> transcode -B 0,0,8 -X 0,38,8 x vob -y xvid4 -w $bitrate -I 3
>
> 704x576 [720x576] (*) aspect ratio 16:9:
> transcode -B 0,0,8 -X 0,40,8 -x vob -y xvid4 -I 3
>
> 4:3 720:576
> transcode -B 2,0,8 -X 0,3,8 -x vob -y xvid4 -I 3
>
> 4:3 704:576:
> transcode -B 4,0,8 -X 0,3,8 -x vob -y xvid4 -I 3
>
> -----------------------------
>
> I believe that I could improve the conversoning speed a lot.
>
> With the deinterlacing, the resizing and -a bitrate of 1200 I get a fps of
> 13 on an Amd64 3200+.
>
> Does someone know better resizing options? I am not asking about other
> comandline options. Just better values?
>
> For instance does -B 0,0,8 -X 0,38,8 the same job as -B 4,0 -Y 24,0 on a
> 720:576 aspect ratio 16:9, just that -B 4,0 -Y 24,0 works more than twice
> as fast.
>
> I would be very thankful, if someone could tell me some better values then
> the ones I found out. By the way it would be very nice if one could put
> these values on the transcoding wiki.
>
> Thank you in advance
