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• FFMPEG width not divisible by 2 (639x360)

  5 octobre 2020, par yasgur99

  I am using python wrapper command of ffmepeg. I followed the tutorial from here for a "Production ready HLS" : https://docs.peer5.com/guides/production-ready-hls-vod/

  


  This is my code :

  


   subprocess.call(['ffmpeg', '-y', '-i', download_path,
                     '-vf', 'scale=w=640:h=360:force_original_aspect_ratio=decrease', \
                     '-c:a', 'aac', '-ar', '48000', '-c:v', 'h264', \
                     '-profile:v', 'main', '-crf', '20', '-sc_threshold', '0', \
                     '-g', '48', '-keyint_min', '48', '-hls_time', '4', \
                     '-hls_playlist_type', 'vod',  '-b:v', '800k', \
                     '-maxrate', '856k', '-bufsize', '1200k', '-b:a', '96k', \
                     '-hls_segment_filename', upload_path + \
                     '/360p_%03d.ts', upload_path + '/360p.m3u8', \
                     '-vf', 'scale=w=842:h=480:force_original_aspect_ratio=decrease', \
                     '-c:a', 'aac', '-ar', '48000', '-c:v', 'h264', \
                     '-profile:v', 'main', '-crf', '20', '-sc_threshold', '0', \
                     '-g', '48', '-keyint_min', '48', '-hls_time', '4', \
                     '-hls_playlist_type', 'vod', '-b:v', '1400k', \
                     '-maxrate', '1498k', '-bufsize', '2100k', '-b:a', '128k', \
                     '-hls_segment_filename', upload_path + \
                     '/480p_%03d.ts', upload_path + '/480p.m3u8', \
                     '-vf', 'scale=w=1280:h=720:force_original_aspect_ratio=decrease', \
                     '-c:a', 'aac', '-ar', '48000', '-c:v', 'h264', \
                     '-profile:v', 'main', '-crf', '20', '-sc_threshold', '0', \
                     '-g', '48', '-keyint_min', '48', '-hls_time', '4', \
                     '-hls_playlist_type', 'vod', '-b:v', '2800k', \
                     '-maxrate', '2996k', '-bufsize', '4200k', '-b:a', '128k', \
                     '-hls_segment_filename', upload_path + \
                     '/720p_%03d.ts', upload_path + '/720p.m3u8', \
                     '-vf', 'scale=w=1920:h=1080:force_original_aspect_ratio=decrease', \
                     '-c:a', 'aac', '-ar', '48000', '-c:v', 'h264', \
                     '-profile:v', 'main', '-crf', '20', '-sc_threshold', '0', \
                     '-g', '48', '-keyint_min', '48', '-hls_time', '4', \
                     '-hls_playlist_type', 'vod', '-b:v', '5000k', \
                     '-maxrate', '5350k', '-bufsize', '7500k', '-b:a', '192k', \
                     '-hls_segment_filename', upload_path + '/1080p_%03d.ts', upload_path + '/1080p.m3u8'])


  


  And getting this output

  


  [libx264 @ 0x7fb95500c800] width not divisible by 2 (639x360)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


  


  Any ideas of whats going wrong ?

  


• "Relocation cannot be used against local symbol" only for one platform (x86)

  10 janvier 2023, par JonasVautherin

  Problem

  


  I am cross-compiling gstreamer using Meson, and it works for 3 different platforms (android-arm, android-arm64, android-x86_64) but fails for android-x86 with errors like :

  


  ld: error: relocation R_386_32 cannot be used against local symbol; recompile with -fPIC


  


  I can't seem to understand which component was not built with -fPIC, and I don't understand why this would differ between the 4 platforms. If 3 are built with -fPIC, why would the fourth be different ?

  


  Details

  


  More specifically, it fails with a bunch of the following errors :

  


  FAILED: subprojects/FFmpeg/test_avcodec_utils
/usr/i686-linux-android/bin/clang  -o subprojects/FFmpeg/test_avcodec_utils subprojects/FFmpeg/test_avcodec_utils.p/libavcodec_tests_utils.c.o -Wl,--as-needed -Wl,--no-undefined -Wl,-O1 -pie -Wl,-Bsymbolic -fPIC -Wl,--start-group subprojects/FFmpeg/libavcodec-static.a subprojects/FFmpeg/libavutil.a subprojects/FFmpeg/libavutil-static.a subprojects/FFmpeg/libswresample.a subprojects/FFmpeg/libswresample-static.a -pthread -lm -lz -lz -Wl,--end-group
ld: error: relocation R_386_32 cannot be used against local symbol; recompile with -fPIC
>>> defined in subprojects/FFmpeg/libavcodec-static.a(libavcodec-static.a.p/dirac_dwt.o)
>>> referenced by x86util.asm:1315 (/work/build/android-x86/dependencies/gstreamer/gstreamer/src/gstreamer/subprojects/FFmpeg/libavutil/x86/x86util.asm:1315)
>>>               libavcodec-static.a.p/dirac_dwt.o:(.text+0x9F) in archive subprojects/FFmpeg/libavcodec-static.a


  


  I essentially run $ meson setup --cross-file my-crossfile build . in a Dockcross container, with some options, so nothing special there as far as I can tell.

  


  My cross-file looks like this (similar to the other 3 that work, except for cpu and cpu_family that differ) :

  


  [constants]
cross_triple = 'i686-linux-android'
cross_root = '/usr/' + cross_triple

[properties]
pkg_config_libdir = ''

[binaries]
c = cross_root + '/bin/clang'
cpp = cross_root + '/bin/clang++'
ar = cross_root + '/bin/llvm-ar'
as = cross_root + '/bin/llvm-as'
ranlib = cross_root + '/bin/llvm-ranlib'
ld = cross_root + '/bin/ld'
strip = cross_root + '/bin/llvm-strip'
pkgconfig = 'pkg-config'

[host_machine]
system = 'android'
cpu_family = 'x86'
cpu = 'i686'
endian = 'little'


  


• Is it okay to execute ffmpeg and do not use their library ?

  18 juillet 2017, par Michael Pravilov

  I need to extract audio from video and save it. FFmpeg has command for this purpose. I wonder if it is a right way to execute ffmpeg from my code and not to write code with their API functions.

  The lack of this approach is that I use Qt Framework and need cross-platform application. Sometimes (especially in windows, because PATH variable doesn’t set up automatically so call ffmpeg won’t work) a user will need to indicate path to executable file to run in command line.

  So both variants are possible to realize, but which is the best and correct one ?

  I don’t really want to use their API because it is not so easy to understand and will take time to write my own code.

  Thanks for any advice !