External Video Decoder - Linux 32-bit Compatibility

If you are running mencoder on a 64-bit Linux platform, you may encounter run-time failures. These problems may also present themselves when running other 32-bit video decoder programs, such as ffmpeg. There is no compile-time solution for these problems; they can only be fixed by installing additional packages in the Linux operating system. These packages are generally referred to as "32-bit compatibility libraries” or “multi-arch support”, and the exact number and names of the required libraries may vary depending on the brand of Linux you are using.

Diagnosis

On the 64-bit Linux platform, if you attempt to load a video and you have to use the external decoder and it fails, determine if your Linux platform needs patching by running 32-bit mencoder or other video decoders.

To test for this problem:

1.	Go to the root of your Altair HyperWorks installation, then go to the hw/examples/video/bin/linux64 directory.

2.	Run ./mencoder. If the following message is displayed:

mencoder: error while loading shared libraries: libsmbclient.so.0: wrong ELF class: ELFCLASS64

then you need a 32-bit version of the package mentioned in the error. In this case, libsmbclient.

To fix this problem:

•	Obtain and install the missing 32-bit compatibility packages stated in the error message for your Linux 64-bit platform.

Note:

You may support from your IT department, as you need to be logged in with root access to install the package, and also must determine the exact 32-bit packages that are missing.

Why not just use a 64-bit video decoder?

Most of the important video compression formats cannot be obtained in 64-bit libraries. A 64-bit version of mencoder cannot use the 32-bit codecs that come with it and are necessary to decode such video formats as Indeo 4 and 5.

Requirements from mencoder

•	POSIX system - You need a POSIX-compatible shell and POSIX-compatible system tools like grep, sed, awk, and so on, in your path.

•	GNU make 3.81 or later

•	binutils - GNU binutils 2.11 or later.

•	compiler - We mostly use gcc, the recommended versions on x86 are 2.95 and 3.4+. On PowerPC, use 4.x+. icc 10.1+ is also recommended.

•	Xorg/XFree86 - recommended version is 4.3 or later. Make sure the development packages are installed, too, otherwise it will not work. It is not required that you have X; some video output drivers work without it.

•	FreeType - 2.0.9 or later is required for the OSD and subtitles

•	ALSA - optional, for ALSA audio output support. At least 0.9.0rc4 is required.

•	libjpeg - required for the optional JPEG video output driver

•	libpng - required for the optional PNG video output driver

•	directfb - optional, 0.9.22 or later required for the directfb/dfbmga video output drivers

•	lame - 3.98.3 or later, necessary for encoding MP3 audio with MEncoder

•	zlib - recommended, many codecs use it.

•	LIVE555 Streaming Media - optional, needed for some RTSP/RTP streams

•	cdparanoia - optional, for CDDA support

•	libxmms - optional, for XMMS input plug-in support. At least 1.2.7 is required.

•	libsmb - optional, for SMB networking support

•	libmad - optional, for fast integer-only MP3 decoding on FPU-less platforms

Requirements from ldd

•	linux-gate.so.1 => (0xffffe000)

•	libncurses.so.5 => /usr/lib/libncurses.so.5 (0xf7f05000)

•	libsmbclient.so.0 => not found

•	libpng12.so.0 => /usr/lib/libpng12.so.0 (0x00311000)

•	libz.so.1 => /lib/libz.so.1 (0x00944000)

•	libmng.so.1 => /usr/lib/libmng.so.1 (0xf7e82000)

•	libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x00531000)

•	libungif.so.4 => /usr/lib/libungif.so.4 (0xf7e7f000)

•	libasound.so.2 => /lib/libasound.so.2 (0x00738000)

•	libdl.so.2 => /lib/libdl.so.2 (0x006fb000)

•	libpthread.so.0 => /lib/libpthread.so.0 (0x006e0000)

•	libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x0041f000)

•	libbz2.so.1 => /usr/lib/libbz2.so.1 (0x004b6000)

•	libm.so.6 => /lib/libm.so.6 (0x00702000)

•	libc.so.6 => /lib/libc.so.6 (0x00585000)

•	liblcms.so.1 => /usr/lib/liblcms.so.1 (0xf7e47000)

•	libgif.so.4 => /usr/lib/libgif.so.4 (0xf7e3e000)

•	librt.so.1 => /lib/librt.so.1 (0x0072d000)

•	/lib/ld-linux.so.2 (0x00566000)

•	libX11.so.6 => /usr/lib/libX11.so.6 (0x00101000)

•	libXau.so.6 => /usr/lib/libXau.so.6 (0x0092b000)

•	libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00d47000)

Requirements for Linux 64-bit

Below are the names only, minus version number, of all the i686 packages that are needed to make this tool work:

1.	ncurses-libs

2.	libsmbclient

libcap

libattr

5.	libcom_err

db4

7.	cyrus-sasl-lib

8.	keyutils-libs

9.	libselinux

10.

krb5-libs

11.

sqlite

12.

readline

13.

openldap

14.

nspr

15.

nss-util

16.

nss

17.	nss-softokn

18.

zlib

19.	audit-libs

20.

pam

21.

cracklib

22.

libtdb

23.	samba-winbind-clients

24.

libtalloc

25.

libpng

26.

libmng

27.

lcms-libs

28.

libjpeg

29.

giflib

30.

libICE

31.

libSM

32.

libX11

33.

libXau

34.

libuuid

35.

libxcb

36.

libuuid

37.

alsa-lib

38.

freetype

39.	bzip2-libs

Example - libsmbclient Library Requirement

Package	Arch	Version	Repository	Size
Installing:
libsmbclient	i686	3.5.10-114.el6	/libsmbclient-3.5.10-114.el6.i686	6.5 M
Installing for dependencies:
audit-libs	i686	2.1.3-3.el6	dvd	59 k
cracklib	i686	2.8.16-4.el6	dvd	70 k
cyrus-sasl-lib	i686	2.1.23-13.el6	dvd	135 k
db4	i686	4.7.25-16.el6	dvd	580 k
keyutils-libs	i686	1.4-3.el6	dvd	20 k
krb5-libs	i686	1.9-22.el6	dvd	716 k
libselinux	i686	2.0.94-5.2.el6	dvd	107 k
libtalloc	i686	2.0.1-1.1.el6	dvd	18 k
libtdb	i686	1.2.1-3.el6	dvd	29 k
nspr	i686	4.8.8-3.el6	dvd	113 k
nss	i686	3.12.10-16.el6	dvd	778 k
nss-softokn	i686	3.12.9-11.el6	dvd	172 k
nss-util	i686	3.12.10-2.el6	dvd	46 k
openldap	i686	2.4.23-20.el6	dvd	261 k
pam	i686	1.1.1-10.el6	dvd	656 k
readline	i686	6.0-3.el6	dvd	176 k
samba-winbind-clients	i686	3.5.10-114.el6	dvd	1.1 M
sqlite	i686	3.6.20-1.el6	dvd	307 k
zlib	i686	1.2.3-27.el6	dvd	72 k
Transaction Summary Install 20 Package(s)

Example 2 - giflib requirements

Package	Arch	Version	Repository	Size
Installing:
giflib	i686	4.1.6-3.1.el6	/giflib-4.1.6-3.1.el6.i686	78 k
Installing for dependencies:
libICEi686	i686	1.0.6-1.el6	dvd	52 k
libSM	i686	1.1.0-7.1.el6	dvd	26 k
libX11	i686	1.3-2.el6	dvd	585 k
libXau	i686	1.0.5-1.el6	dvd	22 k
libuuid	i686	2.17.2-12.4.el6	dvd	65 k
libxcb	i686	1.5-1.el6	dvd	103 k
Transaction Summary Install 7 Package(s)

External Video Decoder - Linux 32-bit Compatibility

External Video Decoder - Linux 32-bit Compatibility

External Video Decoder - Linux 32-bit Compatibility

Diagnosis

To test for this problem:

To fix this problem:

Why not just use a 64-bit video decoder?

Requirements from mencoder

Requirements from ldd

Requirements for Linux 64-bit

Example - libsmbclient Library Requirement

Package

Arch

Version

Repository

Size

Example 2 - giflib requirements

Package

Arch

Version

Repository

Size