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• concat 2 videos with sound and loop with the other audio which is longer or shorter

  27 juillet 2021, par Andy

  I have audio.mp3 can be longer or shorter than concat of 2 videos with sound.

  


  

  • If audio > video, video will be looped until audio stops

  


  • If audio < video, ffmpeg will ends when audio stops

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  Currently, I have to use 2 lines :

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  ffmpeg -y -i v1.mp4 -i v2.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0?]concat=n=2:v=1:a=1[outv][outa]" -c:v libx264 -map "[outv]" -map "[outa]" v12.mp4


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  and

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  ffmpeg -i audio.mp3 -stream_loop -1 -i v12.mp4 -filter_complex "amovie=${BODY12}:loop=0,volume=0.5,apad[A];[0:a][A]amerge[outa]" -c:v copy -c:a aac -map 1:v -map "[outa]" -shortest -y newvideo.mp4


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  Do you have any suggestions to combine 2 lines above to 1 line ffmpeg to reduce time for rendering ? Thanks.

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• Build ffmpeg on a build machine

  18 juillet 2019, par RDI

  Build ffmpeg on build PC using libx264 and shared libraries (not static).
  I am building on a Red Hat 6.6 Server and final target machine is CentOS 6.6.
  I am trying, as said, to build ffmpeg with encoding enabled (with libx264) and shared libraries ; of course I do not want to install the libraries on the build PC, they should be only extracted and then delivered together with the final RPM.
  After the "./configure" I get all RPMs (related to ffmpeg) but when trying to installing ffmpeg-libs on the build pc it fails because the libx264.so.157 is not found, even if as test I installed it (configure/make/make install) and present at /usr/local/lib.

  Where am I wrong ?

  Thanks

  This is my SPEC file at the moment :

  ldconfig /usr/local/lib
  
  export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
  
  
  
  
  
  # configure 
  
  ./configure \
  
   --enable-gpl --disable-static --enable-shared --extra-cflags="-I/usr/local/include" --extra-ldflags="-L/usr/local/lib" --extra-libs=-ldl --disable-autodetect --disable-doc --disable-postproc --disable-ffplay --disable-everything --enable-encoder=aac --enable-encoder=png --enable-encoder=mjpeg --enable-encoder=libx264 --enable-decoder=aac --enable-decoder=h264 --enable-decoder=mpeg4 --enable-decoder=rawvideo --enable-decoder=png --enable-muxer=mp4 --enable-muxer=stream_segment --enable-muxer=image2 --enable-demuxer=aac --enable-demuxer=h264 --enable-demuxer=mov --enable-demuxer=rtp --enable-parser=aac --enable-parser=h264 --enable-parser=mpeg4video --enable-bsf=aac_adtstoasc --enable-protocol=file --enable-protocol=http --enable-protocol=tcp --enable-protocol=rtp --enable-protocol=udp --enable-indev=xcbgrab --disable-alsa --enable-libxcb --enable-libxcb-xfixes --enable-libxcb-shape --enable-zlib --prefix=%{_prefix} --bindir=%{_bindir} --datadir=%{_datadir}/%{name} --shlibdir=%{_libdir} --enable-alsa --enable-avfilter --enable-avresample --enable-libx264 --enable-filter=scale \

• avformat/mxfdec : do not use sound essence descriptor quantization bits for bits_per_c...

  26 août 2018, par Marton Balint

  avformat/mxfdec : do not use sound essence descriptor quantization bits for bits_per_coded_sample
  It refers to the uncompressed quantization, therefore is not correct for AAC.
  Also change mxf_set_pts to work based on current edit unit if
  
  bits_per_coded_sample is not available.
  Fixes error messages in the sample of ticket #7366.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/mxfdec.c