Cai dat x264 - ffmpeg - psnr-tools

2 link tham khao:
- http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide
- http://imedia.disi.unitn.it/QoE/

1. x264
Download:

git clone --depth 1 git://git.videolan.org/x264

(Hoac lay truc tiep tren trang videolan.org)

Cai dat:

cd x264

./configure --enable-shared 

(chu y mac dinh file configure cua x264 la disable-shared, do do khi ffmpeg goi mot so ham theo kieu lien ket dong se ko goi duoc) 

make

sudo make install (thuong duong dan mac dinh se o /usr/local/include/x264.h va /usr/local/lib/libx264*)

2. fdk-aac

Download: 

git clone --depth 1 git://github.com/mstorsjo/fdk-aac.git

(Hoac lay truc tiep o day: ftp://ftp.videolan.org/pub/x264/snapshots/last_x264.tar.bz2)

Cai dat:

autoreconf -fiv (chay lenh nay truoc vi fdk-aac chua sinh file configuration)

./configuration

make 

sudo make install

3. libvpx

Download:
git clone --depth 1 http://git.chromium.org/webm/libvpx.git

(Hoac lay truc tiep o day: http://code.google.com/p/webm/downloads/list) 

Cai dat:

./configure

make

sudo make install

4. ffmpeg

Download: Chu y can download dung goi ffmpeg for psnr-tools 

(neu lech phien ban se thieu nhieu ham ma psnr-tools goi)

wget http://imedia.disi.unitn.it/QoE/ffmpeg-for-psnrtools.tgz

tar xvfz ffmpeg-for-psnrtools.tgz 

Cai dat:

./configure --enable-gpl --enable-libfaac --enable-libfdk-aac --enable-libmp3lame \
  --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora \
  --enable-libvorbis --enable-libvpx --enable-x11grab --enable-libx264 --enable-nonfree \
  --enable-version3

--> se xuat hien ra nhieu loi trong do co loi libx264 not found; 

(Nguyen nhan la do version cua ffmpeg va x264 khong tuong ung voi nhau

Rat nhieu ham ffmpeg goi tu x264, nhung ban x264 lastest khong co hoac da sua ten ham)

Khac phuc:

b1. Mo file configure cua ffmpeg, xem ffmpeg dang require nhung thu vien nao va ham nao trong thu vien do

vd:  require  libx264 x264.h x264_encoder_open -lx264 -lm

b2. Kiem tra lai ten ham dung trong x264 dang dinh nghia

lenh: nm /usr/local/lib/libx264.a | grep x264_encoder_open

ket qua: 0000000000007b10 T x264_encoder_open_128

(Co nghia la ham nay da duoc implement trong x264 nhung ten la x264_encoder_open_128)

b3. Mo lai file configure cua ffmpeg va sua lai ham x264_encoder_open --> x264_encoder_open_128

Luc nay bien dich lai se khong con loi x264 not found nua nhung xuat hien them vo so loi khac

(Nguyen nhan mot so ham trong x264 da thay doi interface, co 2 cach khac phuc: hoac la sua code x264

hoac sua code ffmpeg; o day toi chon sua code ffmpeg vi se de sua hon)

File can sua code:

- libavcodec/libx264.c:

Doan code cu: 

if(x264_nal_encode(x4->sei, &x4->sei_size, 1, nals + i) < 0)

    return -1;

==> sua lai nhu sau: (do x264 define ham x264_nal_encode chi co 3 tham so)

x264_nal_encode(x4->sei, &x4->sei_size, nals + i);

if(nals + i < 0) return -1;

Bay gio bien dich se het loi (khong nho la minh con sua loi nao o ffmpeg nua ko :)

5. psnr-tools

download: 

git clone http://brenta.disi.unitn.it/~kiraly/PublicGits/psnr-tools.git

Cai dat: (psnr-tools khong tao bo cai theo autoconfig tool nen khong co file configure

chi can chay thang lenh make; chu y trong Makefile cuar psnr-tools co su dung bien FFDIR;

can chinh cho FFDIR tro dung den thu muc ffmpeg va x264 tren may cua minh)

make FFDIR=$PWD/../ffmpeg/ X264DIR=$PWD/../x264/ 

--> se sinh ra vo so loi

(Nguyen nhan khong hieu tai sao Makefile cua psnr-tools link thieu rat nhieu thu vien???; 

luu y Makefile ngoai thu muc psnr-tools chi goi den Makefile trong cac thu muc con

--> can phai sua Makefile cua cac thu muc con; cu the: Analyser/Makefile)

Chi thi bien dich ban dau:

LDLIBS = -lavformat -lavcodec -lavutil

sua them nhu sau:(de ra them duoc cac lib cho dung thi can bien dich, 

co loi lai tim xem ham nao khong reference duoc nam trong thu vien nao) 

LDLIBS = -lavformat -lavcodec -lavutil -lfaac -lfdk-aac -lmp3lame -lopencore-amrnb 

-lopencore-amrwb -ltheora -ltheoradec -ltheoraenc -lvorbis -lvorbisenc -lvpx -lx264 -lrtmp

Chu y: vd voi chi thi bien dich -lavformat --> ban chat trinh dich se tim thu vien 

libavformat.a (hoac khi chay chuong trinh se goi ham trong libavformat.so) 

trong mot trong cac thu muc mac dinh sau: /usr/local/lib; /usr/lib/; /lib/

--> mot so thu vien mac du da cai roi nhung nam trong /usr/lib/x86_64-linux-gnu/ 

(so di nam o day la vi cai bang apt-get install)

can duoc  copy den cac thu muc mac dinh (hoac chuan nhat la tao symbolic link)

lenh: ln ...

Luc nay make se OK

psnr-tools Makefile khong ho tro make install --> co the viet them vao make file hoac copy

bang tay nhung file chay can thiet den /usr/local/bin hoac /usr/sbin de co the chay tu bat 

ky dau

(con cap nhat...)