Tanya 7 : Konversi ogv ke flv dengan mencoder

Tanya :
Mas, tahu konverter ogv ke flv via terminal ndak ? Saya menggunakan Ubuntu Lucid
Jawab :
Coba mencoder
Install dengan :

sudo apt-get install mencoder

Lalu gunakan perintah :

mencoder -of lavf -oac mp3lame -lameopts abr:br=56 -srate 22050 -ovc  lavc \
-lavcopts  vcodec=flv:vbitrate=250:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 \
-vf  scale=640:480 -o filekeluaran.flv fileinput.ogv

Keterangan :
mencoder : Menjalankan program mencoder
-of lavf : Melakuan enkoding video dengan libavformat muxers
-oac mp3lame : Melakukan enkoding audio dengan LAME menjadi MP3
-lameopts : opsi untuk mp3lame
abr : average bit rate
:br : bitrate dalam kbps –> 56 berarti 56 kbps
-srate : memilih sampel rate keluaran yang ingin digunakan
-ovc lavc : Melakukan enkoding video dengan libavcodec codec.
-lavcopts : Menetapkan av codec yang diinginkan yakni : vcodec=flv:vbitrate=250:mbd=2:mv0:trell:v4mv:cbp:last_pred=3
Contoh :

mencoder -of lavf -oac mp3lame -lameopts abr:br=56 -srate 22050 -ovc lavc -lavcopts vcodec=flv:vbitrate=250:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 -vf scale=640:480 -o outputmovie.flv inkscapegradasiwarna.ogv

Anda akan melihat proses konversi seperti berikut, lamanya bergantung besarnya file yang sedang anda konversi.

MEncoder SVN-r1.0~rc3+svn20090426-4.4.3 (C) 2000-2009 MPlayer Team
success: format: 0  data: 0x0 - 0x86bad
Ogg stream 0 is of an unknown type
[Ogg] stream 1: video (Theora v3.2.1), -vid 0
[Ogg] stream 2: audio (Vorbis), -aid 0
Ogg file format detected.
VIDEO:  [theo]  1280x800  24bpp  15.000 fps    0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:18  fourcc:0x6F656874  size:1280x800  fps:15.000  ftime:=0.0667
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 22050 Hz, 1 ch, s16le, 90.0 kbit/25.51% (ratio: 11248->44100)
Selected audio codec: [ffvorbis] afm: ffmpeg (FFmpeg Vorbis)
==========================================================================
** MUXER_LAVF *****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit.
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
Opening video filter: [scale w=640 h=480]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
[theora @ 0x8b4d500]Missing extradata!
Could not open codec.
VDecoder init failed :(
Opening video decoder: [theora] Theora/VP3
VDec: vo config request - 1280 x 800 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.60:1 - prescaling to correct movie aspect.
SwScaler: reducing / aligning filtersize 9 -> 8
 Last message repeated 1 times
SwScaler: reducing / aligning filtersize 8 -> 7
 Last message repeated 1 times
[swscaler @ 0x8c69340]BICUBIC scaler, from yuv420p to yuv420p using MMX2
[swscaler @ 0x8c69340]using 8-tap MMX scaler for horizontal luminance scaling
[swscaler @ 0x8c69340]using 8-tap MMX scaler for horizontal chrominance scaling
[swscaler @ 0x8c69340]using n-tap MMX scaler for vertical scaling (YV12 like)
[swscaler @ 0x8c69340]1280x800 -> 640x480
videocodec: libavcodec (640x480 fourcc=31564c46 [FLV1])
[VE_LAVC] High quality encoding selected (non-realtime)!
Selected video codec: [theora] vfm: theora (Theora (free, reworked VP3))
==========================================================================
MP3 audio selected.
VIDEO CODEC ID: 22
AUDIO CODEC ID: 15001, TAG: 0
Writing header...
[flv @ 0x8b4ac90]Codec for stream 0 does not use global headers but container format requires global headers
[flv @ 0x8b4ac90]Codec for stream 1 does not use global headers but container format requires global headers
Pos:   6.3s     94f (99%) 33.58fps Trem:   0min   0mb  A-V:0.062 [200:51]
Flushing video frames.
Writing index...
Video stream:  200.364 kbit/s  (25045 B/s)  size: 156952 bytes  6.267 secs  94 frames
Audio stream:   51.192 kbit/s  (6398 B/s)  size: 37443 bytes  5.851 secs

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