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• C Code Using FFmpeg libraries - Compilation Error

  17 août 2013, par Ardatr

  I've been recently trying to compile C code that uses the FFmpeg libraries ; however, the compilation fails due to a reason that I cannot determine.

  The code that I've been trying to compile is the filtering_audio.c file on the Doxygen Documentation website for FFmpeg (I'll provide the link, since the code is too long to quote here) : http://ffmpeg.org/doxygen/trunk/doc_2examples_2filtering_audio_8c-example.html

  I use gcc to compile the code :

      gcc filter.c -lavformat -lavcodec -lavfilter  -lavutil

  And I get the following undefined reference errors :

      /tmp/cc90K2S5.o: In function `init_filters':
  
      filter.c:(.text+0x3e5): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x407): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x42d): undefined reference to `av_opt_set_bin'
  
      filter.c:(.text+0x482): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x4a4): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x4ca): undefined reference to `av_opt_set_bin'
  
      filter.c:(.text+0x51f): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x541): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x567): undefined reference to `av_opt_set_bin'
  
      /tmp/cc90K2S5.o: In function `print_frame':
  
      filter.c:(.text+0x76b): undefined reference to `av_frame_get_channel_layout'
  
      /tmp/cc90K2S5.o: In function `main':
  
      filter.c:(.text+0x831): undefined reference to `av_frame_alloc'
  
      filter.c:(.text+0x83d): undefined reference to `av_frame_alloc'
  
      filter.c:(.text+0x9de): undefined reference to `av_buffersrc_add_frame_flags'
  
      filter.c:(.text+0xa16): undefined reference to `av_buffersink_get_frame'
  
      filter.c:(.text+0xa58): undefined reference to `av_frame_unref'
  
      filter.c:(.text+0xab6): undefined reference to `av_frame_free'
  
      filter.c:(.text+0xac5): undefined reference to `av_frame_free'
  
      collect2: error: ld returned 1 exit status

  I understand that the undefined reference error indicates that it wasn't able to find the functions referenced from filtering_audio.c, but this doesn't make sense, since these functions should exist in the FFmpeg libraries.

  Any help is appreciated, thank you !

• avfilter/vf_ssim : Fix x86 assembly code for SSIM calculation

  31 juillet 2023, par Evgeny Pavlov

  avfilter/vf_ssim : Fix x86 assembly code for SSIM calculation
  This commit fixes bug #10495
  The code had several bugs related to post-loop compensation code :
  
   test assembly instruction performs bitwise AND operation and
  
  generate flags used by jz branch instruction. Wrong test condition
  
  leads to incorrect branching
  
   Incorrect compensation code for some branches
  Signed-off-by : Evgeny Pavlov <lucenticus@gmail.com>
  

  • [DH] libavfilter/x86/vf_ssim.asm

• lavu/riscv : indent code

  18 novembre 2023, par Rémi Denis-Courmont

  lavu/riscv : indent code
  This reindents code to prepare for the next changeset.
  
  No functional changes.
  

  • [DH] libavutil/riscv/cpu.c