Recherche avancée

Sur d’autres sites (10735)

• libavcodec : Set hidden visibility on global symbols accessed from AArch64 assembly

  11 juillet 2022, par Martin Storsjö

  libavcodec : Set hidden visibility on global symbols accessed from AArch64 assembly
  The AArch64 assembly accesses those symbols directly, without
  
  indirection via e.g. the GOT on ELF. In order for this not to
  
  require text relocations, those symbols need to be resolved fully
  
  at link time, i.e. those symbols can't be interposable.
  Normally, so far, this is achieved when linking shared libraries
  
  in two ways ; we have a version script (libavcodec/libavcodec.v) which
  
  marks all symbols that don't start with av* as local. Additionally,
  
  we try to add -Wl,-Bsymbolic to the linker options if supported,
  
  making sure that such symbol references are resolved fully at link
  
  time, instead of making them interposable.
  When the libavcodec static library is linked into another shared
  
  library, there's no guarantee that it uses similar options (even though
  
  that would be favourable), which would end up requiring text relocations
  
  in the AArch64 assembly.
  Explicitly mark the symbols that are accessed from AArch64 assembly
  
  as hidden, so that they are resolved fully at link time even without
  
  the version script and -Wl,-Bsymbolic.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aacsbrdata.h
  • [DH] libavcodec/fft.h
  • [DH] libavcodec/vp9dsp.h
  • [DH] libavutil/attributes_internal.h

• FFmpeg gdigrab failed to capture image

  1er février 2023, par Marek Spišiak

  Hi I am trying to capture desktop with ffmpeg gdigrab. I am using SSH connection to remotely use admin cmd on windows 10 pc. When i execute this command normally it works but remotely it doesnt.

  


  ffmpeg -f gdigrab -framerate 30 -i desktop output.mkv

  


  error message

  


  ffmpeg version 4.4-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[gdigrab @ 000001f3e781e600] Capturing whole desktop as 1024x768x32 at (0,0)
[gdigrab @ 000001f3e781e600] Failed to capture image (error 5)
[gdigrab @ 000001f3e781e600] Could not find codec parameters for stream 0 (Video: bmp, none, 754987 kb/s): unspecified size
Consider increasing the value for the 'analyzeduration' (15000000) and 'probesize' (70000000) options
Input #0, gdigrab, from 'desktop':
  Duration: N/A, bitrate: 754987 kb/s
  Stream #0:0: Video: bmp, none, 754987 kb/s, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
Output #0, matroska, to 'pipe:':
Output file #0 does not contain any stream


  


  I tried to increase analyzeduration and probesize to max integer but it doesnt help.

  


• How to avoid ffmpeg failing to add chapters to mov file ?

  27 septembre 2022, par BabaG

  I've been trying all day to get ffmpeg to add chapters to a prores mov file. It does add the first two, but then it fails with the name of the text file and an error message :

  


  chapterstest_orig.txt: Invalid data found when processing input


  


  I see lots of online references to the format of both the ffmpeg command, as well as the text file containing the chapter metadata. Here are mine :

  


  ffmpeg -i chapterstest_orig.mov -i chapterstest_orig.txt -map_metadata 1 -codec copy chapterstest.mov


  


  i've also tried it with -map_chapters :

  


  ffmpeg -i chapterstest_orig.mov -i chapterstest_orig.txt -map_metadata 1 -map_chapters 1 -codec copy chapterstest.mov


  


  Here's a copy of my text file, containing the chapter info :

  


  ;FFMETADATA1
title=Angel's Gate Cultural Center
artist=Buzzworld

[CHAPTER]
TIMEBASE=1/1000
START=0
END=6999
title=Buzzworld 10-10-1997

[CHAPTER]
TIMEBASE=1/1000
START=7000
END=290999
title=The Road To Lisdoonvarna

[CHAPTER]
TIMEBASE=1/1000
START=291000
END=739999
title=Jack Orion

[CHAPTER]
TIMEBASE=1/1000
START=740000
END=992999
title=The Frieze Britches

[CHAPTER]
TIMEBASE=1/1000
START=993000
END=1295999
title=The Blackleg Miner

[CHAPTER]
TIMEBASE=1/1000
START=1296000
END=1559999
title=Johnny Jump Up

[CHAPTER]
TIMEBASE=1/1000
START=1560000
END=1867999
title=Tom Billy's

[CHAPTER]
TIMEBASE=1/1000
START=1868000
END=2143999
title=When Will We Be Married?

[CHAPTER]
TIMEBASE=1/1000
START=2144000
END=2500999
title=The Old Bush

[CHAPTER]
TIMEBASE=1/1000
START=2501000
END=2839000
title=Niamh's Capers


  


  If I delete everything after the second chapter, the file processes. It always fails if I add more chapters.

  


  I've also tried using things like :

  


  -map 0:v -map 0:a -map 0:s


  


  Any help is much appreciated. I'm kind of at my wits end here.

  


  Thanks.