我正在交叉编译gst-libav-1.8.0并且有几天遇到阻塞我的问题。你能帮忙吗？
从build.log中启用了许多解复用器。但是当使用gst-inspect时我只发现以下多路分离器。在build.out中找不到错误
当我运行gst-inspect时，我收到了以下警告。不确定它是否与此问题有关：
(gst-inspect-1.0:4419): GStreamer-WARNING **: External plugin loader failed. This most likely means that the plugin loader helper binary was not found or could not be run. You might need to set the GST_PLUGIN_SCANNER environment variable if your setup is unusual. This should normally not be required though.
我使用以下构建脚本进行交叉编译：
#!/bin/sh
ROOT=$PWD/../../../../..
DIRECTORY=$ROOT/../gst/usr/local
if [ ! -d "$DIRECTORY" ]; then
mkdir -p $DIRECTORY
fi
if [ ! -d "$DIRECTORY" ]; then
exit;
fi
export PATH="$ROOT/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.8/bin:$PATH"
export SYS_ROOT="$ROOT/prebuilts/ndk/9/platforms/android-19/arch-arm"
export CC="arm-linux-androideabi-gcc --sysroot=$SYS_ROOT"
export CXX="arm-linux-androideabi-g++"
export LD="arm-linux-androideabi-ld"
export AR="arm-linux-androideabi-ar"
export RANLIB="arm-linux-androideabi-ranlib"
export STRIP="arm-linux-androideabi-strip"
#./configure --host=arm-linux-androideabi --prefix=$DIRECTORY --disable-rpath --includedir=$DIRECTORY/include --libdir=$DIRECTORY/lib --exec-prefix=$DIRECTORY CFLAGS="-fPIE -pie" LDFLAGS="-fPIE -pie" --with-pkg-config-path="$DIRECTORY/lib/pkgconfig" --with-libav-extra-configure="--disable-yasm --pkgconfigdir=$DIRECTORY/lib/pkgconfig --enable-ffmpeg"
./configure --host=arm-linux-androideabi --prefix=$DIRECTORY --disable-rpath --includedir=$DIRECTORY/include --libdir=$DIRECTORY/lib --exec-prefix=$DIRECTORY CFLAGS="-fPIE -pie" LDFLAGS="-fPIE -pie" --with-pkg-config-path="$DIRECTORY/lib/pkgconfig" --with-libav-extra-configure="--disable-yasm"
make
make install
使用gst-inspect只能找到以下解复用程序：
./gst-inspect-1.0 libav |grep demux
avdemux_yuv4mpegpipe: libav YUV4MPEG pipe demuxer
avdemux_wsvqa: libav Westwood Studios VQA demuxer
avdemux_wsaud: libav Westwood Studios audio demuxer
avdemux_wc3movie: libav Wing Commander III movie demuxer
avdemux_voc: libav Creative Voice demuxer
avdemux_vmd: libav Sierra VMD demuxer
avdemux_tta: libav TTA (True Audio) demuxer
avdemux_psxstr: libav Sony Playstation STR demuxer
avdemux_sol: libav Sierra SOL demuxer
avdemux_smk: libav Smacker demuxer
avdemux_film_cpk: libav Sega FILM / CPK demuxer
avdemux_pva: libav TechnoTrend PVA demuxer
avdemux_nuv: libav NuppelVideo demuxer
avdemux_nut: libav NUT demuxer
avdemux_nsv: libav Nullsoft Streaming Video demuxer
avdemux_mxf: libav MXF (Material eXchange Format) demuxer
avdemux_mpc8: libav Musepack SV8 demuxer
avdemux_mpc: libav Musepack demuxer
avdemux_mmf: libav Yamaha SMAF demuxer
avdemux_mm: libav American Laser Games MM demuxer
avdemux_ipmovie: libav Interplay MVE demuxer
avdemux_idcin: libav id Cinematic demuxer
avdemux_gxf: libav GXF (General eXchange Format) demuxer
avdemux_gif: libav CompuServe Graphics Interchange Format (GIF) demuxer
avdemux_4xm: libav 4X Technologies demuxer
avdemux_ffm: libav FFM (FFserver live feed) demuxer
avdemux_ea: libav Electronic Arts Multimedia demuxer
avdemux_daud: libav D-Cinema audio demuxer
avdemux_avs: libav AVS demuxer
avdemux_ape: libav Monkey's Audio demuxer
avdemux_aiff: libav Audio IFF demuxer
但是在build.log中它表示启用了以下解复用程序：
Enabled demuxers:
aa fourxm mpc8
aac frm mpegps
ac3 fsb mpegts
acm g722 mpegtsraw
act g723_1 mpegvideo
adf g729 mpjpeg
adp genh mpl2
ads gif mpsub
adx gsm msf
aea gxf msnwc_tcp
afc h261 mtv
aiff h263 mv
amr h264 mvi
anm hevc mxf
apc hls mxg
ape hnm nc
apng ico nistsphere
aqtitle idcin nsv
asf idf nut
asf_o iff nuv
ass ilbc ogg
ast image2 oma
au image2_alias_pix paf
avi image2_brender_pix pcm_alaw
avr image2pipe pcm_f32be
avs image_bmp_pipe pcm_f32le
bethsoftvid image_dds_pipe pcm_f64be
bfi image_dpx_pipe pcm_f64le
bfstm image_exr_pipe pcm_mulaw
bink image_j2k_pipe pcm_s16be
bintext image_jpeg_pipe pcm_s16le
bit image_jpegls_pipe pcm_s24be
bmv image_pictor_pipe pcm_s24le
boa image_png_pipe pcm_s32be
brstm image_qdraw_pipe pcm_s32le
c93 image_sgi_pipe pcm_s8
caf image_sunrast_pipe pcm_u16be
cavsvideo image_tiff_pipe pcm_u16le
cdg image_webp_pipe pcm_u24be
cdxl ingenient pcm_u24le
cine ipmovie pcm_u32be
concat ircam pcm_u32le
data iss pcm_u8
daud iv8 pjs
dcstr ivf pmp
dfa ivr pva
dirac jacosub pvf
dnxhd jv qcp
dsf live_flv r3d
dsicin lmlm4 rawvideo
dss loas realtext
dts lrc redspark
dtshd lvf rl2
dv lxf rm
dvbsub m4v roq
dxa matroska rpl
ea mgsts rsd
ea_cdata microdvd rso
eac3 mjpeg sami
epaf mlp sbg
ffm mlv sdr2
ffmetadata mm segafilm
filmstrip mmf shorten
flac mov siff
flic mp3 sln
flv mpc smacker
smjpeg tmv w64
smush truehd wav
sol tta wc3
sox tty webm_dash_manifest
spdif txd webvtt
srt v210 wsaud
stl v210x wsvqa
str vag wtv
subviewer vc1 wv
subviewer1 vc1t wve
sup vivo xa
svag vmd xbin
swf vobsub xmv
tak voc xvag
tedcaptions vpk xwma
thp vplayer yop
threedostr vqf yuv4mpegpipe
tiertexseq
答案 0 :(得分：0)
启用日志后我发现了线索。从源代码来看，似乎有些解复用器被禁用了：
in file ext/libav/gstavdemux.c
/* Set the rank of demuxers known to work to MARGINAL.
* Set demuxers for which we already have another implementation to NONE
* Set All others to NONE*/
执行以下代码修改后，所有解复用程序都已注册：
if (1) {
/*if (!strcmp (in_plugin->name, "wsvqa") ||
!strcmp (in_plugin->name, "wsaud") ||
!strcmp (in_plugin->name, "wc3movie") ||
!strcmp (in_plugin->name, "voc") ||
!strcmp (in_plugin->name, "tta") ||
!strcmp (in_plugin->name, "sol") ||
!strcmp (in_plugin->name, "smk") ||
!strcmp (in_plugin->name, "vmd") ||
!strcmp (in_plugin->name, "film_cpk") ||
!strcmp (in_plugin->name, "ingenient") ||
!strcmp (in_plugin->name, "psxstr") ||
!strcmp (in_plugin->name, "nuv") ||
!strcmp (in_plugin->name, "nut") ||
!strcmp (in_plugin->name, "nsv") ||
!strcmp (in_plugin->name, "mxf") ||
!strcmp (in_plugin->name, "mmf") ||
!strcmp (in_plugin->name, "mm") ||
!strcmp (in_plugin->name, "ipmovie") ||
!strcmp (in_plugin->name, "ape") ||
!strcmp (in_plugin->name, "RoQ") ||
!strcmp (in_plugin->name, "idcin") ||
!strcmp (in_plugin->name, "gxf") ||
!strcmp (in_plugin->name, "ffm") ||
!strcmp (in_plugin->name, "ea") ||
!strcmp (in_plugin->name, "daud") ||
!strcmp (in_plugin->name, "avs") ||
!strcmp (in_plugin->name, "aiff") ||
!strcmp (in_plugin->name, "4xm") ||
!strcmp (in_plugin->name, "yuv4mpegpipe") ||
!strcmp (in_plugin->name, "pva") ||
!strcmp (in_plugin->name, "mpc") ||
!strcmp (in_plugin->name, "mpc8") || !strcmp (in_plugin->name, "gif"))
*/
rank = GST_RANK_MARGINAL;
}
else {
GST_DEBUG ("ignoring %s", in_plugin->name);
rank = GST_RANK_NONE;
goto next;
}
现在我得到了所有的解复用器。稍后会验证它们。
答案 1 :(得分：0)
由于demuxers支持这些libav。有一种更好的方法可以启用某些demuxer插件。
可以使用以下命令配置Demuxer插件：
--enable-muxer=NAME enable muxer NAME
# As you can see all muxers are disabled by default
--disable-muxers disable all muxers
您可以在libav来源下找到整个配置脚本：
alan@libav-11.7$ls
arch.mak avprobe.c COPYING.GPLv3 libavformat README.md
avconv.c Changelog COPYING.LGPLv2.1 libavresample RELEASE
avconv_dxva2.c cmdutils.c COPYING.LGPLv3 libavutil tests
avconv_filter.c cmdutils_common_opts.h CREDITS library.mak tools
avconv.h cmdutils.h doc libswscale VERSION
avconv_opt.c common.mak INSTALL LICENSE version.sh
avconv_vda.c compat libavcodec Makefile
avconv_vdpau.c configure libavdevice presets
avplay.c COPYING.GPLv2 libavfilter README
所以请使用
alan@libav-11.7$./configure --enable-demuxer=mux_name1 mux_name2