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Participer à sa traduction
10 avril 2011Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
Actuellement MediaSPIP n’est disponible qu’en français et (...) -
Encoding and processing into web-friendly formats
13 avril 2011, parMediaSPIP automatically converts uploaded files to internet-compatible formats.
Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
All uploaded files are stored online in their original format, so you can (...) -
Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
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ffmpeg libx264 neon optimization breaks execution
27 janvier 2014, par nmxprimeHi use libx264 source obtained from
x264-snapshot-20140122-2245
and compiling using below scriptNDK=~/Android/android-ndk-r7c
PLATFORM=$NDK/platforms/android-9/arch-arm/
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
function build_one
{
./configure --prefix=$PREFIX \
--sysroot=$PLATFORM \
--disable-avs \
--disable-lavf \
--disable-ffms \
--disable-gpac \
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
--host=arm-linux \
--enable-static \
--libdir=$PLATFORM/usr/lib \
--includedir=$PLATFORM/usr/include \
--extra-cflags="-march=armv7-a -mfloat-abi=softfp -mfpu=neon -mvectorize-with-neon-quad" \
--extra-ldflags="-Wl,--fix-cortex-a8" \
--enable-debugThe config log is :
platform: ARM
system: LINUX
cli: yes
libx264: internal
shared: no
static: yes
asm: yes
interlaced: yes
avs: no
lavf: no
ffms: no
mp4: no
gpl: yes
thread: no
opencl: yes
filters: crop select_every
debug: yes
gprof: no
strip: no
PIC: no
bit depth: 8
chroma format: all
You can run 'make' or 'make fprofiled' now.I hope the above code compiles and optimizes for
NEON
executionDoubts :
Why Threads is
no
, because i didn't specified--disable-thread
What is
cli
and it's significance here, also significance of opencl, such that libx264 uses opencl features ?
Then i built
ffmpeg 1.2.5
with following script./configure --target-os=linux \
--prefix=$PREFIX \
--enable-cross-compile \
--extra-libs="-lgcc" \
--arch=arm \
--cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
--nm=$PREBUILT/bin/arm-linux-androideabi-nm \
--sysroot=$PLATFORM \
--extra-cflags=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
--disable-shared \
--enable-static \
--extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog -lx264 $EXTRA_LD_FLAG" \
--disable-ffplay \
--disable-everything \
--enable-avformat \
--enable-avcodec \
--enable-libx264 \
--enable-gpl \
--enable-encoder=libx264 \
--enable-encoder=libx264rgb \
--enable-decoder=h264 \
--disable-network \
--disable-avfilter \
--disable-avdevice \
--enable-debug=3 \
$ADDITIONAL_CONFIGURE_FLAGwhere
ADDITIONAL_CONFIGURE_FLAG = --enable-debug=3
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -march=$CPU -mvectorize-with-neon-quad"The log shows NEON supported.
When i run the code (called in a while loop),
ret = avcodec_encode_video2(c, &pkt, picture, &got_output);//avcodec_encode_video(c, finalout, outbuf_size, picture);
fprintf(stderr,"ret = %d, got-out = %d \n",ret,got_output);
if (ret < 0)
fprintf(stderr, "error encoding frame\n");
if (got_output)
fprintf(stderr,"encoding frame %3d (size=%5d): (ret=%d)\n", 1, pkt.size,ret);it runs for 2 or 3 time(during which
if(got_output)
is not true), then i getSIGSEGV
. Triedaddr2line
andndk-stack
but no use[Though i enabled debug info, ndk-stack cannot find routine info].I edited
libx264's encoder.c
code with some fprintf statements.
Posting snippet of codeif( h->frames.i_input <= h->frames.i_delay + 1 - h->i_thread_frames )
{
/* Nothing yet to encode, waiting for filling of buffers */
pic_out->i_type = X264_TYPE_AUTO;
fprintf(stderr,"EditLog:: Returns as waiting for filling \n"); //edit
return 0;
}
}
else
{
/* signal kills for lookahead thread */
x264_pthread_mutex_lock( &h->lookahead->ifbuf.mutex );
h->lookahead->b_exit_thread = 1;
x264_pthread_cond_broadcast( &h->lookahead->ifbuf.cv_fill );
x264_pthread_mutex_unlock( &h->lookahead->ifbuf.mutex );
}
fprintf(stderr,"After wait for fill \n");
fprintf(stderr,"h: %p \n",h); //edit
fprintf(stderr,"h->i_frame = %p \n",&h->i_frame); //edit
h->i_frame++;
fprintf(stderr,"after i_frame++");in log, i don't see
after i_frame++
, here occurs (may be) theSIGSEGV
.Please help in solving it. The same works without neon optimization !!
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Wrapping an h264 stream with ts (transport stream)
20 août 2018, par ICU_Suppose I have an incoming stream of H264 data wrapped in RTP. After I strip the RTP header, how can I re-wrap it into a TS header (transport stream) for playing on the web browser ? I know Ffmpeg can do it, but am not on a windows or linux platform. So I need to manually do it. I would need a simple library in c or c++.
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Prevent libavformat (FFmpeg) from adding "ENCODER" tag to output / stripping tags
1er mars 2014, par Wyatt8740I made a bash script that transfers audio or video metadata from one file to another, regardless of media container format, via FFMpeg. My problem is that FFMpeg consistently adds a 'ENCODER' tag.
Example :
Before running through FFMpeg :
File : track01.cdda.flac
Metadata:
ALBUM : Wish You Were Here
ARTIST : Pink Floyd
COPYRIGHT : 1975 Harvest Records
DATE : 1975
GENRE : Experimental Rock
TITLE : Shine On You Crazy Diamond
track : 1After running through FFMpeg :
File : track01-iphone-alac.m4a
Metadata:
ALBUM=Wish You Were Here
ARTIST=Pink Floyd
COPYRIGHT=1975 Harvest Records
DATE=1975
GENRE=Experimental Rock
TITLE=Shine On You Crazy Diamond
track=1
ENCODER=Lavf55.12.100So really, I want to either force FFMpeg to not add the 'ENCODER' tag, or I want to strip that tag off afterwards. Is there a way to do this ? I really don't want to spend hours trying to compile FFMpeg again on my Pentium 4 HT - the only working computer I have at the moment. I'd prefer not to have to use another program unless it's related enough to FFMpeg or MPlayer/Mencoder that I won't have to install anything new if I have those installed.