Quoting "Aaron Newcomb" <[email protected]>:
This is pretty close to my workflow so I think you are on the right
track. x264 is definitely better than mp4 if you are looking for good
quality to file size ratio.
well....x264 is a video codec where .mp4 is better a format for
audio/video file.
Maybe when you say "mp4" you meant "mpeg4", which is definitly a video
codec you can compare with x264.
While, for example:
mpeg2 (standard format for dvd) or special mpeg you were trying to
use to render from cinelerra are are slightly different, beeing
lossless codec HIres;
Where h264/.mp4 are better used as lossy low res(1280x720) option to
upload video on hd mediabase (as vimeo is)
:D
vale
I am playing around with my x264 ffmpeg
command. Here is what it is currently, but I think I can do better.
ffmpeg -i inputfile -an -pass 1 -aspect 16:9 -vcodec h264 -b 512k -r
29.97 -flags +loop -cmp +chroma -partitions 0 -me_method epzs -subq 1
-trellis 0 -refs 1 -coder 0 -me_range 16 -g 250 -keyint_min 25
-sc_threshold 40 -i_qfactor 0.71 -bt 512k -maxrate 768k -bufsize 2M
-rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4
-level 13 outputfile.mp4 && ffmpeg -i inputfile -acodec aac -ab 128k
-pass 2 -aspect 16:9 -vcodec h264 -b 512k -r 29.97 -flags +loop -cmp
+chroma -partitions +parti4x4+partp4x4+partp8x8+partb8x8 -flags2
+mixed_refs -me_method umh -subq 7 -trellis 2 -refs 5 -coder 0
-me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71
-bt 512k -maxrate 768k -bufsize 2M -rc_eq 'blurCplx^(1-qComp)' -qcomp
0.6 -qmin 10 -qmax 51 -qdiff 4 -level 13 -y outputfile.mp4
On Sun, May 17, 2009 at 12:14 AM, Daniel Jircik<[email protected]> wrote:
Hi
Looking for critique and suggestions for hdv to web hd workflow. I like
vimeo... results:
http://vimeo.com/4684883
dvgrab -a -f hdv
Load clips and render to 720p Quicktime for Linux using translate,
deinterlace and sharpen
yuva 4:2:2 planar file is apr. 5 GB per min
uncompressed rgb is apr 10 GB per min.
Edit and render Quicktime for Linux.
As per this very informative thread:
http://flowplayer.org/forum/7/12671
I got pretty good h264 results.
mp4 from yuva 4:2:2 is apr 15 MB per min
mp4 from uncompressed rgb is 30 MB per min
the ffmpeg comandline is:
$ ffmpeg -y -i 720-yuv-test2.mov -acodec libfaac -ar 44100 -ab 96k -vcodec
libx264 -level 41 -crf 20 -bufsize 20000k -maxrate 25000k -g 250 -r 20 -s
1280x720 -coder 1 -flags +loop -cmp +chroma -partitions
+parti4x4+partp8x8+partb8x8 -flags2 +brdo+dct8x8+bpyramid -me umh -subq 7
-me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -rc_eq
'blurCplx^(1-qComp)' -bf 16 -b_strategy 1 -bidir_refine 1 -refs 6
-deblockalpha 0 -deblockbeta 0 vimeohd2.mp4
It ended up being a bit choppier than I had hoped and there is a small audio
delay.
Where I was not sucsessful was trying to render mpeg2 with cinelerra as per
crazed
mulehttp://crazedmuleproductions.blogspot.com/2007/06/beginners-guide-to-exporting-video-from.htmls
Audio rendered but video crashed with errors.
Is mpeg any better than x264 ?
Suggestions?
Kind Regards
Daniel Jircik
http://reggaecobras.com
--
Thanks,
Aaron Newcomb
http://www.thesourceshow.org
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