How to encode video in H264 format
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.
Thanks to S0ma for the updated options.
Ffmpeg/x264 (profile High, level 3.0) (older versions)
Replace the options above with:
options="-vcodec libx264 -b 512k -bf 3 -subq 6 -cmp 256 -refs 5 -qmin 10 \ -qmax 51 -qdiff 4 -coder 1 -loop 1 -me hex -me_range 16 -trellis 1 \ -flags +mv4 -flags2 +bpyramid+wpred+mixed_refs+brdo+8x8dct \ -partitions parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -g 250 \ -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71"
Ffmpeg/x264 (profile Baseline, level 3.0) (iPhone)
Replace the options above with:
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 0 \ -flags2 +mixed_refs -coder 0 -me_range 16 \ -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10\ -qmax 51 -qdiff 4" Mencoder & mp4creator
Thanks to Martin Bündgens for the following PHP script.
system("mencoder ". $file_input ." -o ". $file_output_raw ." -ovc x264 -x264encopts bitrate=300:threads=auto:subq=6:partitions=all:8x8dct:me=umh:frameref=5:bframes=3:b_pyramid:weight_b -vf bmovl=0:0:mylogo.fifo,scale=". $nw .":". $nh .",harddup -oac faac -faacopts br=56:mpeg=4:object=2 -srate 44100 -ofps 24000/1001"); system("mplayer ". $file_output_raw. " -dumpaudio -dumpfile ". $file_output_aac .""); system("mplayer ". $file_output_raw. " -dumpvideo -dumpfile ". $file_output_h264 .""); system("mp4creator -create=". $file_output_aac. " ". $file_output .""); system("mp4creator -create=". $file_output_h264. " -rate=23.976 ". $file_output .""); system("mp4creator -hint=1 ". $file_output .""); system("mp4creator -hint=2 ". $file_output .""); system("mp4creator -optimize ". $file_output .""); Telestream Episode Engine Pro 5
Files transcoded by a are reported to work. The files are H264/AAC in an MP4 container. They are compatible with both Flash and iPod.
Encoding H264 on Tiger
Here is a little wisdom snippet from challefredde:
I'm using different tools but mostly this combination: On Mac OS X 10.4 Tiger:
- Perian plugin installed (watch almost all videos in Quicktime)
- Mpeg Streamclip from Squared 5
- x264 Quicktime codec. Encodes better h264 videos than Quicktime's built-in.
- QTFastStart
Video: 900 kbit/s, Audio: AAC, stereo 96 kbit/s, Res: 640x360 (widescreen)
The video plays fine on iPod's.
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