Tag Archives: encoding

Encoding – h264

Encoding – h264 – Trac.

Ffmpeg/x264 (profile High, level 3.0) (latest versions of x264)

We have successfully been using ffmpeg/libx264 with two pass encoding using the following commands:

  infile ="video.avi"
  tmpfile="video_tmp.mp4"
  outfile="video.mp4"
  options="-vcodec libx264 -b 512k -flags +loop+mv4 -cmp 256 \
	   -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 \
	   -me_method hex -subq 7 -trellis 1 -refs 5 -bf 3 \
	   -flags2 +bpyramid+wpred+mixed_refs+dct8x8 -coder 1 -me_range 16 \
           -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10\
	   -qmax 51 -qdiff 4"

  ffmpeg -y -i "$infile" -an -pass 1 -threads 2 $options "$tmpfile"

  ffmpeg -y -i "$infile" -acodec libfaac -ar 44100 -ab 96k -pass 2 -threads 2 $options "$tmpfile"

  qt-faststart "$tmpfile" "$outfile"

The last line ‘qt-faststart’ is optional. It doesn’t hurt though and it even may save a little time on the server which is hosting the movie files.

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