Newest 'libx264' Questions - Stack Overflow

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  • flv file (with 264 video stream) cannot be decoded.

    5 septembre 2012, par Hong

    I have generate an flv file using libx264. It only contains video tags and some meta data. It can be played by ffmpeg, however, most commercial players cannot decode it.

    The file is at, http://www.kuaipan.cn/file/id_3690055512098762.htm, the livestream_test.flv.

    Very thanks if you know any possible errors in the file, I'm really confused now.

  • libx264 2 pass encoding with mbtree option, first pass fails

    25 août 2012, par lightdee

    I'm working on an application which uses libx264. When doing 2-pass encodes, if the mbtree option is enabled, the 1st pass doesn't seem to put anything into the stats files:

        x264_1345845358591.L.mbtree.temp (size of 0)
    x264_1345845358591.L.temp

    $ cat x264_1345845358591.L.temp 
    #options: 288x162 fps=2997/100 timebase=100/2997 bitdepth=8 cabac=0 ref=3 
    deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 
    mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 
    fast_pskip=1 chroma_qp_offset=-2 threads=48 sliced_threads=0 nr=0 
    decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 
    weightp=0 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 
    rc=abr mbtree=1 bitrate=210 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 
    ip_ratio=1.40 aq=1:1.00**

    When I do x264_encoder_open() for the 2nd pass, I get the failure message:

        x264 [error]: ratecontrol_init: can't open stats file
    x264 [error]: x264_encoder_open failed

    So it seems to be failing in the first pass. 2pass works fine if I turn off mbtree. I can run it with presets or tune parameters as long as mbtree is turned off. What parameter (see above list) might make mbtree fail in the first pass?

  • no c compiler found libx264 build [closed]

    24 août 2012, par kerim yucel

    I have been trying to build ffmpeg for Android and I have managed to do so by using roman10's tutorial.

    However, I needed x264 and I enabled libx264 in the configurations but it wasn't able to find the library. A quick internet search led me to the answer that I have to build x264 seperately and include it to ffmpeg config by editing ExternalLibs flags.

    Currently I am using this script to build x264. Everything is fine except the fact that the error saying "No working C compiler is found" pops up. I have updated and installed build-essential and my gcc version is up to date.

    Any help will be appreciated. Thanks a lot.

    P.S. I am using ndk 4 just to make everything compatible with the tutorial link given above. I am running Ubuntu with VirtualBox from Windows 7.

    Edit: I have been trying this tutorial as well, I am getting the same error along with unknown options error for each configuration options.

    Another edit: I have tried this code and obtained the following.

    echo 'int main() { return 0;}' > main.c && arm-eabi-gcc main.c || echo $?

    /home/mehmet/Android_NDK_r4/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/../../../../arm-eabi/bin/ld: crt0.o: No such file: No such file or directory collect2: ld returned 1 exit status 1

    I have checked the flags as well, flags seem ok or I can't see the faulty line. Above you may find the build script I am using.

    export ARM_ROOT=/home/mehmet/Android_NDK_r4
export ARM_INC=$ARM_ROOT/build/platforms/android-8/arch-arm/usr/include/
export ARM_LIB=$ARM_ROOT/build/platforms/android-8/arch-arm/usr/lib/
export ARM_TOOL=$ARM_ROOT/build/prebuilt/linux-x86/arm-eabi-4.4.0
export ARM_LIBO=$ARM_TOOL/lib/gcc/arm-eabi/4.4.0
export PATH=$ARM_TOOL/bin:$PATH
export PATH=$ARM_TOOL/arm-eabi/bin:$PATH
export ARM_PRE=arm-eabi 
./configure --prefix=/sdcard/arm_and \
--disable-gpac \
--extra-cflags=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-prote
ctor -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv5te -mtu
ne=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID -Wa,--noexecstack -
MMD -MP " \
--extra-ldflags=" -nostdlib -Bdynamic -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/system
/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -nostdlib $ARM_LIB/crtbegin_dynamic.o $ARM_LIB/crtend_android.o -lc -lm -ldl -lgcc " \
--cross-prefix=${ARM_PRE}- \
--disable-asm\
--host=arm-linux \

    Third edit:

    Config.log gives the following.

    x264 configure script
Command line options: "--prefix=/sdcard/arm_and" "--disable-gpac" "--extra-cflags=" "-I/home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/include/" "-fPIC" "-DANDROID" "-fpic" "-mthumb-interwork" "-ffunction-sections" "-funwind-tables" "-fstack-prote" "ctor" "-fno-short-enums" "-D__ARM_ARCH_5__" "-D__ARM_ARCH_5T__" "-D__ARM_ARCH_5E__" "-D__ARM_ARCH_5TE__" "-Wno-psabi" "-march=armv5te" "-mtu" "ne=xscale" "-msoft-float" "-mthumb" "-Os" "-fomit-frame-pointer" "-fno-strict-aliasing" "-finline-limit=64" "-DANDROID" "-Wa,--noexecstack" "-" "MMD" "-MP" "--extra-ldflags=" "-nostdlib" "-Bdynamic" "-Wl,--no-undefined" "-Wl,-z,noexecstack" "-Wl,-z,nocopyreloc" "-Wl,-soname,/system" "/lib/libz.so" "-Wl,-rpath-link=/home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/lib/,-dynamic-linker=/system/bin/linker" "-L/home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/lib/" "-nostdlib" "/home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/lib//crtbegin_dynamic.o" "/home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/lib//crtend_android.o" "-lc" "-lm" "-ldl" "-lgcc" "--cross-prefix=arm-eabi-" "--disable-asm" "--host=arm-linux"

    checking whether arm-eabi-gcc works... no
    Failed commandline was:
    --------------------------------------------------
    arm-eabi-gcc conftest.c -Wall -I. -I$(SRCPATH) -I/home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/include/ -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-prote
    ctor -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv5te -mtu
    ne=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID -Wa,--noexecstack -
    MMD -MP -nostdlib -Bdynamic -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/system
    /lib/libz.so -Wl,-rpath-link=/home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/lib/,-dynamic-linker=/system/bin/linker -L/home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/lib/ -nostdlib /home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/lib//crtbegin_dynamic.o /home/mehmet/Android_NDK_r4/build/platforms/android-8/arch-arm/usr/lib//crtend_android.o -lc -lm -ldl -lgcc -lm -o conftest
    arm-eabi-gcc: ctor: No such file or directory
    arm-eabi-gcc: ne=xscale: No such file or directory
    arm-eabi-gcc: MMD: No such file or directory
    arm-eabi-gcc: /lib/libz.so: No such file or directory
    cc1: error: unrecognized command line option "-mtu"
    cc1: error: unrecognized command line option "-fstack-prote"
    cc1: error: to generate dependencies you must specify either -M or -MM
    arm-eabi-gcc: -E or -x required when input is from standard input
    --------------------------------------------------
    Failed program was:
    --------------------------------------------------
    int main () { return 0; }
    --------------------------------------------------
    DIED: No working C compiler found.

    Last edit Problem solved. It was just a mistake related to typos. It works well now.

  • What, if any, guarantees are there for when `nalu_process` will be called ?

    1er août 2012, par gspr

    In particular, can a call to x264_encoder_encode return before every nalu_process callback associated to it has returned? Someone in #x264 suggested it's settings-dependent; I'm talking here about the "zerolatency" preset.

    If the answer to the above question is yes, then how common is it, empirically?

  • GStreamer x264enc and SIGSEGV on Android

    18 juillet 2012, par Cipi

    I am trying to play around with GStreamer-java and it's h.264 encoder (x264enc) on Android.

    Now, I tried to encode raw video from test video source (set its is-live property to TRUE), and when data starts flowing into the x264enc Element, I get SIGSEGV in libx264.so and my app crashes. And it looks like code is dereferencing a NULL... Exact error location is in file "gstreamer_ndk_bundle/x264/encoder/analyse.c" line 963. And it is this line:

    h->mc.memcpy_aligned( h->mb.pic.i8x8_dct_buf, h->dct.luma8x8, sizeof(h->mb.pic.i8x8_dct_buf) );

    My device's CPU is Cortex 8 and it has NEON feature...

    I tried to printout to a file all h structure fields, and no field is uninitialized.

    Android DEBUG info from LogCat: HERE

    My questions:

    1. How can I know what is throwing SIGSEGV, because this line of code seems to be ok?
    2. Is this a known bug or an expected behavior of x264 encoder on ARM CPU or I am missing some encoder configuration?
    3. I noticed that if I set property analyse of the encoder to 0x3:0x113 (some random value I found online) I don't get SIGSEGV, encoder seems to work, but I get error in pipeline: Data flow error. Can I just set analyse to a meaningful value?

    Update

    I fprintf-ed all important "h" fields just before execution runs in x264_mb_analyse_intra() function and just before the line that it breaks, guess it could help: http://pastebin.com/sAfX239j

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