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• vorbisenc : Separate copying audio samples from windowing

  14 juin 2017, par Tyler Jones

  vorbisenc : Separate copying audio samples from windowing
  Audio samples are shifted around when copying from the frame queue so that
  
  analysis can be done without negatively impacting calculation of the MDCT.
  Window coefficients are applied to the current two overlapped windows
  
  simultaneously instead of applying overlap for the next frame ahead of time.
  
  This improves readability when applying windows of varying lengths.
  Signed-off-by : Tyler Jones <tdjones879@gmail.com>
  
  Reviewed-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/vorbisenc.c

• avformat : Remove unnecessary av_packet_unref()

  7 janvier 2020, par Andreas Rheinhardt

  avformat : Remove unnecessary av_packet_unref()
  Since bae8844e the packet will always be unreferenced when a demuxer
  
  returns an error, so that a lot of calls to av_packet_unref() in lots of
  
  demuxers are now redundant and can be removed.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/aacdec.c
  • [DH] libavformat/adp.c
  • [DH] libavformat/adxdec.c
  • [DH] libavformat/amr.c
  • [DH] libavformat/ape.c
  • [DH] libavformat/avs.c
  • [DH] libavformat/brstm.c
  • [DH] libavformat/c93.c
  • [DH] libavformat/cdxl.c
  • [DH] libavformat/concatdec.c
  • [DH] libavformat/dfa.c
  • [DH] libavformat/dsicin.c
  • [DH] libavformat/dss.c
  • [DH] libavformat/dxa.c
  • [DH] libavformat/electronicarts.c
  • [DH] libavformat/fitsdec.c
  • [DH] libavformat/flic.c
  • [DH] libavformat/g723_1.c
  • [DH] libavformat/gdv.c
  • [DH] libavformat/gsmdec.c
  • [DH] libavformat/hls.c
  • [DH] libavformat/icodec.c
  • [DH] libavformat/idcin.c
  • [DH] libavformat/idroqdec.c
  • [DH] libavformat/ilbc.c
  • [DH] libavformat/img2dec.c
  • [DH] libavformat/iv8.c
  • [DH] libavformat/libmodplug.c
  • [DH] libavformat/lxfdec.c
  • [DH] libavformat/mov.c
  • [DH] libavformat/mpc.c
  • [DH] libavformat/mpegts.c
  • [DH] libavformat/mpjpegdec.c
  • [DH] libavformat/ncdec.c
  • [DH] libavformat/nuv.c
  • [DH] libavformat/oggdec.c
  • [DH] libavformat/redspark.c
  • [DH] libavformat/rl2.c
  • [DH] libavformat/rpl.c
  • [DH] libavformat/s337m.c
  • [DH] libavformat/sapdec.c
  • [DH] libavformat/sdr2.c
  • [DH] libavformat/sierravmd.c
  • [DH] libavformat/siff.c
  • [DH] libavformat/spdifdec.c
  • [DH] libavformat/swfdec.c
  • [DH] libavformat/thp.c
  • [DH] libavformat/vivo.c
  • [DH] libavformat/vpk.c
  • [DH] libavformat/vqf.c
  • [DH] libavformat/wvdec.c
  • [DH] libavformat/yuv4mpegdec.c

• How to generating waveform from video & show it with video

  25 novembre 2016, par Salil

  We are using Rails as a backend & AngularJS on Front End side in my App where we need to show Video & audio waveform of that video.

  We are using ’wavesurfer.js’ to show the waveform on Front End side & ’node-pcm’ to generate pcm from video file on BackEnd side.

  This is working as expected but in some of the videos while creating waveform from pcm data instead of showing small sine waves we get flat line.
  Also it takes too much time to show the waveform for every page reload.

  To overcome this issue we are planning to create waveform image using ffmpeg

  ffmpeg -i 'https://s3.amazonaws.com/aadasdsadsadasdas/xyz.mp4' -filter_complex showwavespic -frames:v 1 output.png

  This is working fine but it also takes too much time (Ofcourse only once ) to generate the image for remote video (i.e. We are saving videos on S3)

  Problem with this i don’t get any library to integrate the waveform image with the Video.

  Can someone suggest any better approach related to this.