Build video enc
From M1Research
!!!! WARNING !!!! Article migrated to Encoding prerecorded video at streaming411.com.
Contents |
Encoding video using ffmpeg
One-pass encoding video MPEG4,h264,h263; audio AAC
Encoding mpeg4 video example:
ffmpeg -i /home/video/U0003765.avi -vcodec mpeg4 -r 12 -s qcif -b 64 -acodec aac -ac 1 -ar 16000 -ab 16 /home/enc/test01.mp4
Where
-vcodec h263- video codec h263-r 12- 12 frame per seconds-s qcif- qcif=176x144 pixels-b 64- 64kbit/s video stream
-acodec aac- audio codec is AAC-ac 1- 1 audio channel (mono)-ar 16000- audio sampling frequency - 16kHz-ab 16- 16kBit/s audio stream
For lower bitrates i used 24kHz/32kBit (-ar 24000 -ab 32) or 16kHz/16kBit (-ar 16000 -ab 16).
Encoding h264 video example:
ffmpeg -i /home/video/U0003765.avi -vcodec h264 -r 12 -s qcif -b 64 -acodec aac -ac 1 -ar 16000 -ab 16 /home/enc/test02.mp4
Encoding h263 video example (QT player required, IMHO, .3pg extension for files with h263 codec):
ffmpeg -i /home/video/U0003765.avi -vcodec h263 -r 12 -s qcif -b 64 -acodec aac -ac 1 -ar 16000 -ab 16 /home/enc/test04.mp4
Two-pass encoding video h263,MPEG4,h264; audio AAC
Using two pass encoding could be VERY usefull to create more smother video. If you have pre-recorded material - use two pass encoding.
MPEG4,AAC (h264 has the same manner):
#pass 1 ffmpeg -i /home/video/U0003773.avi -pass 1 -passlogfile logfile -vcodec mpeg4 -r 12 -s qcif -b 64 -an /home/enc/test04.mp4 #delete temp file rm -f /home/enc/test04.mp4 #pass 2 ffmpeg -i /home/video/U0003773.avi -pass 2 -passlogfile logfile -vcodec mpeg4 -r 12 -s qcif -b 64 -acodec aac -ac 1 -ar 24000 -ab 32 /home/enc/test06.3gp
H263,AAC:
#pass 1 ffmpeg -i /home/video/U0003773.avi -pass 1 -passlogfile logfile -vcodec h263 -r 12 -s qcif -b 64 -an /home/enc/test04.mp4 #delete temp file rm -f /home/enc/test06.3gp #pass 2 ffmpeg -i /home/video/U0003773.avi -pass 2 -passlogfile logfile -vcodec h263 -r 12 -s qcif -b 64 -acodec aac -ac 1 -ar 24000 -ab 32 /home/enc/test06.3gp
Encoding H263+amr_nb (amr narrow band)
Befor start to encode check if your ffmpeg version support AMR codec:
[root@dev-3 enc]# ffmpeg -formats | grep amr FFmpeg version SVN-r5504, Copyright (c) 2000-2004 Fabrice Bellard configuration: --prefix=/usr/local/enctools --enable-mp3lame --enable-libogg --enable-vorbis --enable-theora --enable-faad --enable-faadbin --enable-faac --enable-xvid --enable-x264 --enable-a52 --enable-a52bin --enable-amr_nb --enable-amr_wb --enable-dc1394 --enable-gpl --enable-pp --enable-shared --extra-cflags=-I/usr/local/enctools/include --extra-ldflags=-L/usr/local/enctools/lib libavutil version: 49.0.0 libavcodec version: 51.9.0 libavformat version: 50.4.0 built on Jun 29 2006 13:27:24, gcc: 4.1.1 20060525 (Red Hat 4.1.1-1) DE amr 3gpp amr file format DEA amr_nb DEA amr_wb
Used amr encoder supports sampling freq is 8kHz only ( -ar 8000 ) and eight bitrate ranges:
min,Hz max,Hz Bitrate 0 4999 MR475 5000 5899 MR515 5900 6699 MR59 6700 7000 MR67 7001 7949 MR74 7950 9999 MR795 10000 11999 MR102 12000 64000 MR122
encoding h263, arm_nb (4.75kBit):
ffmpeg -i /home/video/U0003765.avi -vcodec h263 -r 12 -s qcif -b 64 -acodec amr_nb -ac 1 -ar 8000 -ab 4 /home/enc/test07.3gp
encoding h263, arm_nb (12.2kBit):
ffmpeg -i /home/video/U0003765.avi -vcodec h263 -r 12 -s qcif -b 64 -acodec amr_nb -ac 1 -ar 8000 -ab 12 /home/enc/test08.3gp
Two-pass encoding could be processed like in previous topic (h263,5fps,32kbs;amr_nb,8kHz,12kB/s):
#pass 1 ffmpeg -i /home/video/U0003773.avi -pass 1 -passlogfile logfile -vcodec h263 -r 5 -s qcif -b 32 -an /home/enc/test10.3gp #delete temp file rm -f /home/enc/test10.3gp #pass 2 ffmpeg -i /home/video/U0003773.avi -pass 2 -passlogfile logfile -vcodec h263 -r 5 -s qcif -b 32 -acodec amr_nb -ac 1 -ar 8000 -ab 12 /home/enc/test10.3gp
Encoding video using VLC.
Single file encoding
Encoding MPEG4,AAC video:
vlc -I dummy /home/video/R0004529.avi vlc:quit --sout '#transcode{
vcodec=mp4v,vb=168,width=176,height=144,deinterlace,
acodec=mp4a,ab=32,channels=2,samplerate=22100}:
std{access=file,mux=mp4,dst=/home/enc/test12.mp4}'
Where:
-I dummy- use text mode (do not start GUI)vlc:quit- exit from VLC after end of playlist (finish encoding)vcodec=mp4v- encode video with MPEG4 codec.vb=168- with 168kB/s bitrate.width=176,height=144- scale video to 176x144 px.deinterlace- deinterlace incoming video.fps=12- frame rate to 12 fps.acodec=mp4a- encode audio with AAC codecab=32- with 32kB/s bitrate.channels=2- stereosamplerate=22100- audio sampling freq
In the same manner encoding h264,H263:
vlc -I dummy /home/video/R0004529.avi vlc:quit
--sout '#transcode{
vcodec=h264,vb=168,width=176,height=144,deinterlace,
acodec=mp4a,ab=32,channels=2,samplerate=22100
}:std{access=file,mux=mp4,dst=/home/enc/test13.mp4}'
vlc -I dummy /home/video/R0004529.avi vlc:quit --sout '#transcode{
vcodec=H263,vb=168,width=176,height=144,deinterlace,
acodec=mp4a,ab=32,channels=2,samplerate=22100
}:std{access=file,mux=mp4,dst=/home/enc/test14.3gp}'
Multiple files encoding
Using duplicate feature of VLC (multiple files output from one source):
vlc -vvv -I dummy /home/video/R0004529.avi vlc:quit --sout '#duplicate{
dst="transcode{
vcodec=H263,vb=96,width=352,height=288,deinterlace,fps=10,
acodec=mp4a,ab=32,channels=2,samplerate=22050}:
std{access=file,mux=mp4,dst=/home/enc/test14_a.3gp}
",dst="transcode{
vcodec=mp4v,vb=96,width=352,height=288,deinterlace,fps=10,
acodec=mp4a,ab=32,channels=2,samplerate=22050}:
std{access=file,mux=mp4,dst=/home/enc/test14_b.mp4}
",dst="transcode{
vcodec=h264,vb=96,width=352,height=288,deinterlace,fps=10,
acodec=mp4a,ab=32,channels=2,samplerate=22050}:
std{access=file,mux=mp4,dst=/home/enc/test14_c.mp4}
"}'
Hinting.
For hinting media files we will use mpeg4ip packet. ([1])
NB!
mp4creator use extension to determinate file type. Next extensions should be used to name elementary stream files (in our case):
.263 - h263 elementary stream .264 - h264 elementary stream .mp4v, .m4v - mpeg4 elementary stream .aac - aac elementary stream .amr - amr elementary stream
Hinting mp4 files
check content of file:
[root@dev-3 enc]# mp4creator -list test05.mp4 Track Type Info 1 video H264 Baseline@5.1, 222.166 secs, 75 kbps, 176x144 @ 12.000036 fps 2 audio MPEG-4 AAC LC, 221.909 secs, 0 kbps, 24000 Hz
[root@dev-3 enc]# mp4creator -list test04.mp4 Track Type Info 1 video MPEG-4 Simple @ L1, 222.166 secs, 0 kbps, 176x144 @ 12.000036 fps 2 audio MPEG-4 AAC LC, 221.909 secs, 0 kbps, 24000 Hz
For creating proper mp4 or 3gp file with hint tracks we should remultplex and add hint track:
remultiplex:
[root@dev-3 enc]# mp4creator -extract=1 test05.mp4 test05.264 [root@dev-3 enc]# mp4creator -extract=2 test05.mp4 test05.aac [root@dev-3 enc]# mp4creator -extract=1 test04.mp4 test04.mp4v [root@dev-3 enc]# mp4creator -extract=2 test04.mp4 test04.aac
compose new file (mp4: h264,aac):
[root@dev-3 enc]# mp4creator -create=test05.264 -rate=12 -optimize -variable-frame-rate test05_r.mp4 [root@dev-3 enc]# mp4creator -hint=1 test05_r.mp4 [root@dev-3 enc]# mp4creator -create=test05.aac -interleave -optimize test05_r.mp4 [root@dev-3 enc]# mp4creator -hint=3 test05_r.mp4 [root@dev-3 enc]# mp4creator -list test05_r.mp4 Track Type Info 1 video H264 Baseline@5.1, 222.166 secs, 75 kbps, 176x144 @ 12.000036 fps 2 hint Payload H264 for track 1 3 audio MPEG-4 AAC LC, 221.909 secs, 32 kbps, 24000 Hz 4 hint Payload mpeg4-generic for track 3
compose new file (mp4: mpeg4,aac):
[root@dev-3 enc]# mp4creator -create=test04.mp4v -rate=12 -optimize -variable-frame-rate test04_r.mp4 [root@dev-3 enc]# mp4creator -hint=1 test04_r.mp4 [root@dev-3 enc]# mp4creator -create=test04.aac -interleave -optimize test04_r.mp4 [root@dev-3 enc]# mp4creator -hint=3 test04_r.mp4 [root@dev-3 enc]# mp4creator -make-isma-10-compliant test04_r.mp4 [root@dev-3 enc]# mp4creator -list test04_r.mp4 Track Type Info 1 video MPEG-4 Simple @ L1, 222.166 secs, 64 kbps, 176x144 @ 12.000036 fps 2 hint Payload MP4V-ES for track 1 3 audio MPEG-4 AAC LC, 221.909 secs, 32 kbps, 24000 Hz 4 hint Payload mpeg4-generic for track 3 5 od Object Descriptors 6 scene BIFS
Hinting 3gp files
check content of source files:
[root@dev-3 enc]# mp4creator -list test06.3gp Track Type Info 1 video H.263, 222.166 secs, 64 kbps, 176x144 @ 12.000036 fps 2 audio MPEG-4 AAC LC, 221.909 secs, 0 kbps, 24000 Hz
[root@dev-3 enc]# mp4creator -list test10.3gp Track Type Info 1 video H.263, 222.400 secs, 32 kbps, 176x144 @ 5.000000 fps 2 audio AMR, 222.020 secs, 13 kbps, 8000 Hz
demultiplex:
[root@dev-3 enc]# mp4creator -extract=1 test06.3gp test06.263 [root@dev-3 enc]# mp4creator -extract=2 test06.3gp test06.aac [root@dev-3 enc]# mp4creator -extract=1 test10.3gp test10.263 [root@dev-3 enc]# mp4creator -extract=2 test10.3gp test10.amr
multiplex (h263,aac):
[root@dev-3 enc]# mp4creator -create=test06.263 -rate=12 -force3GPCompliance -optimize test06_r.3gp [root@dev-3 enc]# mp4creator -create=test06.aac -interleave -optimize test06_r.3gp [root@dev-3 enc]# mp4creator -hint=1 test06_r.3gp [root@dev-3 enc]# mp4creator -hint=2 test06_r.3gp [root@dev-3 enc]# mp4creator -list test06_r.3gp Track Type Info 1 video H.263, 222.088 secs, 64 kbps, 176x144 @ 12.004251 fps 2 audio MPEG-4 AAC LC, 221.909 secs, 32 kbps, 24000 Hz 3 hint Payload H263-2000 for track 1 4 hint Payload mpeg4-generic for track 2
multiplex (h263,amr):
[root@dev-3 enc]# mp4creator -create=test10.263 -rate=5 -force3GPCompliance -optimize test10_r.3gp [root@dev-3 enc]# mp4creator -create=test10.amr -interleave -optimize test10_r.3gp [root@dev-3 enc]# mp4creator -hint=1 test10_r.3gp [root@dev-3 enc]# mp4creator -hint=2 test10_r.3gp [root@dev-3 enc]# mp4creator -list test10_r.3gp Track Type Info 1 video H.263, 222.222 secs, 32 kbps, 176x144 @ 5.004005 fps 2 audio AMR, 222.020 secs, 13 kbps, 8000 Hz 3 hint Payload H263-2000 for track 1 4 hint Payload AMR for track 2
