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• ffmpeg options that work with Chrome

  21 avril 2015, par James

  I am trying to find the magic options that make mp4 work in Chrome. I think my videos were working, but don’t seem to any more after Chrome updated.

  Chrome, Version 41.0.2272.101 (Windows)

  I tried some other machines and found some of the videos worked on older versions, and my Mac seems to still work on the latest Chrome.

  I am using the ffmpeg options to convert from png series,

  ffmpeg -framerate 10 -i dance%02d.png  -r 10 -pix_fmt yuv420p dance.mp4

  Some videos work, some don’t, some work some of the time, or stop half way through.

  I tried various other options like,

  ffmpeg -start_number 16 -framerate 10 -i dance%02d.png -r 10 -an -s hd720 \
  
  -vcodec libx264 -pix_fmt yuv420p -preset slow -profile:v baseline \
  
  -movflags faststart -y dance.mp4

  but this just seemed to make things worse.

  here is one of the videos,
  http://www.botlibre.com/media/a786625.mp4

  and another one,
  http://www.botlibre.com/media/a812450.mp4

  Firefox seems to work no problem, on any version, grey background though.
  IE works fine, white background.
  Safari works, grey background.

  Another thing, they videos used to have white background on older Chrome version, but now are grey, except on Mac still white.

  and one more thing. Webm format works, but anyone know the option to remove transparency ? I’m using,

  ffmpeg -i dance%02d.png  -r 10 -c:v libvpx -crf 10 -b:v 512k -c:a libvorbis dance.webm

  just want a solid white background.

• checkasm : aacencdsp : Actually test nonzero values in quant_bands

  29 janvier, par Martin Storsjö

  checkasm : aacencdsp : Actually test nonzero values in quant_bands
  Previously, we read elements from ff_aac_pow34sf_tab ; however
  
  that table is initialized to zero ; one needs to call
  
  ff_aac_float_common_init() to make sure that the table is
  
  initialized.
  However, given the range of the input values, a large number of
  
  entries in ff_aac_pow34sf_tab would give results outside of the
  
  range for signed 32 bit integers. As the largest aac_cb_maxval
  
  entry is 16, it seems more reasonable to produce values within
  
  an order of mangitude of that value.
  (When hitting INT_MIN, implementations may end up with different
  
  results depending on whether the value is negated as a float or
  
  as an int. This corner case is irrelevant in practice as this
  
  is way outside of the expected value range here.)
  Coincidentally, this fixes linking checkasm with Apple's older
  
  linker. (In Xcode 15, Apple switched to a new linker. The one in
  
  older toolchains seems to have a bug where it won't figure out to
  
  load object files from a static library, if the only symbol
  
  referenced in the object file is a "common" symbol, i.e. one for
  
  a zero-initialized variable. This issue can also be reproduced with
  
  newer Apple toolchains by passing -Wl,-ld_classic to the linker.)
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] tests/checkasm/aacencdsp.c

• Has anyone gotten a windows build of FFMPEG to publish to Akamai's CDN via RTMP ?

  3 décembre 2013, par Ken Conner

  I am trying to live stream a file to Akamai's servers via RTMP from flash and I cannot get past the authentication step even though I know I am using the right username and password (the credentials work in FMLE). I Have found some posts online but they are older and its difficult because no one ever reports what build of FFMPEG they are using.

  Has anyone gotten this to work with Windows binaries ?