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• Fix compile error on arm4/arm5 platform

  23 septembre 2014, par Bernd Kuhls

  Fix compile error on arm4/arm5 platform
  Since these commits
  
  http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=adf8227cf4e7b4fccb2ad88e1e09b6dc00dd00ed
  
  http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=db7f1c7c5a1d37e7f4da64a79a97bea1c4b6e9f8
  compilation on arm4/arm5 fails :
  libavcodec/libavcodec.so : undefined reference to
  
  `ff_startcode_find_candidate_armv6’
  Because libavcodec/arm/Makefile contains
  
  ARMV6-OBJS-$(CONFIG_STARTCODE)         += arm/startcode_armv6.o
  
  function ff_startcode_find_candidate_armv6 is not included for older ARM
  
  archs. The bug was found during automatic buildroot builds :
  http://autobuild.buildroot.net/results/ec7/ec71e4f16ee9106747dff5f15999cbd17903e76f//build-end.log
  
  Quote from configure summary :
  
  ARCH                      arm (armv4t)
  
  big-endian                no
  
  runtime cpu detection     yes
  
  ARMv5TE enabled           no
  
  ARMv6 enabled             no
  
  ARMv6T2 enabled           no
  http://autobuild.buildroot.net/results/be7/be72eb182eaccf0064a32c9dfc2ac1c0d6555506/build-end.log
  
  ARCH                      arm (armv5te)
  
  big-endian                no
  
  runtime cpu detection     yes
  
  ARMv5TE enabled           yes
  
  ARMv6 enabled             no
  
  ARMv6T2 enabled           no
  This patch provides the necessary #if clauses as discussed with Michael :
  
  https://ffmpeg.org/pipermail/ffmpeg-devel/2014-September/163329.html
  Signed-off-by : Bernd Kuhls <bernd.kuhls@t-online.de>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/arm/h264dsp_init_arm.c
  • [DH] libavcodec/arm/vc1dsp_init_arm.c

• FFMPEG - How to setup volume when merging two audio streams

  6 octobre 2014, par N3sh

  I just recently entered the magic and scary world of FFMPEG and, although I found quite a lot of guides online, I need help for my current problem.

  I am merging only audio files and I would like to be able to select their volume.

  Here is my current code for merging 2 files :

  ffmpeg -i test\audio00.mp3 -i test\audio01.mp3 -filter_complex amerge 
  
  -c:a libmp3lame -q:a 0 test\output_overlay.mp3

  I tried the following code, extracted from another answer here on SO (the User was also handling video), but it doesn’t work for me :

  ffmpeg -i test\audio00.mp3 -i test\audio01.mp3 -filter_complex "[0:a]volume=0.9[a1];  
  
  [1:a]volume=0.781250[a2]; [a1][a2]amerge,pan=stereo:c0code>

  I got this error :

  [AVFilterGraph @ 030fa8c0] The following filters could not choose their formats: 
  
  Parsed_amerge_2 Consider inserting the (a)format filter near their input or output.

  Is there a simple way to change the volume for the two streams (even for just the second one, it’s the background music) with FFMPEG ?

  P.S. Also, is it possible to have some sort of ’preview’ before actually rendering the file ?

• How to greatly reduce video size before downloading while maintaining good quality ? [closed]

  25 septembre 2017, par Momin Shaikh

  I need to download huge files from YouTube with my android phone.. need to download a lot of 360p videos for my study purposes but living in a 3rd country like Bangladesh where bandwidth costs is super high forcing me to afford less data. So, I am looking for a way to greatly reduce file size still maintaining good quality.

  I know that converting videos to x265 or HEVC format reduces video sizes as well as keeping the good quality keeping . But i think that can not be done online.. Is there any way to just reduce file size without reducing the quality ?