Recherche avancée

Sur d’autres sites (11596)

• Has anyone used Azure vm's for gpu-accelerated video enc/decoding with FFmpeg/libav ?

  4 mai 2017, par user3776020

  I am trying to use NVIDIA hardware acceleration with FFmpeg/libav on a Microsoft Azure GPU vm (any of the new N-series). I am able to get it working with a comparable AWS vm, but am not having luck with Azure.

  I have a different question posted here detailing the specific problem I’m running into (Trouble with hardware-assisted encoding/decoding via FFmpeg on Azure GPU vm’s (ubuntu 16.04)), but have since realized that the better question to ask is if anyone has been able to achieve it, full-stop.

  If so, would you please share the details of your environment (type of vm, os version, installation commands, etc). Thanks !

• FFMPEG compilation without compiler optimization

  4 avril 2018, par Kamil_H

  I’m compiling ffmpeg for win32 using Microsoft cl compiler. I need to compile it without any optimization, so added configure —extra-cflags= -Od".

  Compilation goes fine, but there are a few places like this :

  Last 3 ifs.

  The code compiles, but doesn’t link because calls like ff_sbrdsp_init_arm(s) ; are not removed by compiler. Of course everything is fine when compiling with optimization. Then compiler removes all if(0)s.

  There are several similar places in ffmpeg. Why if(0) is used instead of preprocessor’s #if 0 ?

  Is there any hidden trick behind this ?

• How to compile ffmpeg in yocto to get a working binary

  3 novembre 2020, par Dharma B

  In our yocto project,the SDK has default "poky/meta/recipes-multimedia/ffmpeg/ffmpeg_3.3.3.bb" bb file. and this is our bbappend file
meta-qti-bsp/recipes-multimedia/ffmpeg/ffmpeg_%.bbappend

  


      EXTRA_OEMAKE = ""

FILES_${PN} += "/lib/lib*.so.*" FILES_${PN} += "/lib/pkgconfig/*" FILES_${PN}-dev += "/usr/share/*" FILES_${PN}-dev += "/lib/lib*.so"

PACKAGECONFIG = "avdevice avfilter avcodec avformat swresample swscale postproc bzlib gpl theora"

# Support multilib compilation for libav PROVIDES += "${MLPREFIX}libav"

EXTRA_CFLAGS_append += " -fPIC" EXTRA_CFLAGS_append += " ${@ bb.utils.contains('TUNE_FEATURES', 'callconvention-hard', '-mfloat-abi=hard', '', d)}" EXTRA_CFLAGS_append += " ${@ bb.utils.contains('TUNE_FEATURES', 'neon', '-mfpu=neon', '', d)}" EXTRA_CFLAGS_append += " ${@ bb.utils.contains('TUNE_FEATURES', 'armv7a', '-march=armv7-a', '', d)}" EXTRA_CFLAGS_append += " ${@ bb.utils.contains('TUNE_FEATURES', 'cortexa8', '-mtune=cortex-a8', '', d)}"

EXTRA_OECONF_append += " \
    --target-os=linux --sysroot=${STAGING_DIR_TARGET} --arch=${TARGET_ARCH} --disable-mmx \
    --enable-shared --disable-doc --disable-htmlpages --disable-manpages --disable-podpages \
    --disable-txtpages --enable-small --disable-debug --disable-ffserver --disable-ffplay \
    --extra-cflags="${EXTRA_CFLAGS}" --disable-network --disable-zlib \
    --enable-fft --libdir=${base_libdir} --shlibdir=${base_libdir} \
    --enable-muxer=mov --enable-muxer=mp4 --enable-encoders --enable-zlib --enable-encoder=png \
    --prefix=${base_libdir} --incdir=${includedir} \ "

do_install() {
    oe_runmake 'DESTDIR=${D}' install
    # Info dir listing isn't interesting at this point so remove it if it exists.
    if [ -e "${D}${infodir}/dir" ]; then
    rm -f ${D}${infodir}/dir
    fi }  NORMAL


  


  with this I could able to get ffmpeg bin. I pushed it on to the device (vr360 chipset : qcs605).
But when I try to invoke any ffmpeg commands say

  


  ffmpeg -ss 00:00:00 -i "input.mp4"  -t 00:01:00 "out.mp4"


  


  I'm getting this error

  


  


  [NULL @ 0xaf61a380] Unable to find a suitable output format for
'out.mp4' out.mp4 : Invalid argument

  


  


  for all ffmpeg operation related to video/image processing I'm getting the same error.

  


  Is there anything else,do I need to enable ?