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• How to find transitions in a DVD ?

  6 juin 2019, par Conrad C

  I am watching instructional videos on a mp4 and I want to find the time at which each new instruction/chapter starts. Every time a new instruction is show, it is preceded with a transition video animation ex :" Instruction #3...."
  I tried this command :

  ffmpeg -i HowToCook.mp4 -filter:v "select='gt(scene,0.7)',showinfo" -f null - 2> ffout2

  But this doesn’t work, and it gives me the times everytime the camera man moves the camera. It doesn’t seem to work on transitions. Is there another command that could work better ?

• Revision c353da68aa : third_party/libwebm : pull from upstream Changes : b6de61a Adds support for simpl

  4 août 2015, par James Zern

  Changed Paths :
   Modify /third_party/libwebm/Android.mk

  
   Modify /third_party/libwebm/PATENTS.TXT

  
   Modify /third_party/libwebm/README.libvpx

  
   Modify /third_party/libwebm/mkvmuxer.cpp

  
   Modify /third_party/libwebm/mkvmuxer.hpp

  
   Modify /third_party/libwebm/mkvmuxerutil.cpp

  
   Modify /third_party/libwebm/mkvmuxerutil.hpp

  
   Modify /third_party/libwebm/mkvparser.cpp

  
   Modify /third_party/libwebm/mkvparser.hpp

  
   Modify /third_party/libwebm/webmids.hpp

  
  
  third_party/libwebm : pull from upstream

  Changes :
  b6de61a Adds support for simple tags
  75a6d2d sample_muxer : Don’t write huge files.
  cec1f85 mkvmuxer : remove unused timecode_scale variable
  8a61b40 Merge "mkvparser : Tiny whitespace fix."
  7affc5c clang-format re-run
  d6d04ac mkvmuxer : use generic Cluster::AddFrame
  4928b0b Merge "mkvmuxer : Write Block key frames correctly."
  c2e4a46 Merge "sample_muxer : Use AddGenericFrame to add frames."
  e97f296 mkvparser : Tiny whitespace fix.
  d66ba44 Merge "Add support to parse DisplayUnit."
  deb41c2 Add support to parse DisplayUnit.
  42e5660 Fix issues on EBML lacing block parsing
  fe1e9bb Fix block parsing to not allow frame_size = 0
  2cb6a28 Change assertions to checks when parsing TrackPositions
  d04580f Fixes issues on Block Group parsing
  c3550fd mkvmuxer : Write Block key frames correctly.
  5dd0e40 Merge "mkvmuxer : Set is_key to true for metadata blocks."
  8e96863 mkvmuxer : Set is_key to true for metadata blocks.
  a9e4819 sample_muxer : Use AddGenericFrame to add frames.
  5a3be73 Change assertions to checks when load CuePoints
  f99f3b2 mkvmuxerutil::EbmlDateElementSize : remove value param
  ff572b5 Frame::IsValid : fix track_number check
  b6311dc mkvmuxer : Refactor to remove a lot of duplicate code
  256cd02 Merge "mkvmuxer : DiscardPadding should be signed integer."
  16c8e78 mkvmuxer : s/frame/data in all AddFrame* functions.
  c5e511c mkvmuxer : DiscardPadding should be signed integer.
  4baaa2c Add framework build script : iosbuild.sh
  3d06eb1 PATENTS : fix a typo : constitutes -> constitute
  d3849c2 mkvparser : Dead code removal.
  f439e52 Change assertions to checks when preloading Cues
  d3a44cd Fix track transversal when listing Cues on sample
  c6255af Tweak .gitignore so git status is clean after checkout and
  build : - added missing underscore to sample_muxer - added cmake and make
  related files
  b5229c7 Makefile.unix : s/samplemuxer/sample_muxer/
  e3616a6 Add support to parse stereo mode, display width and display
  height in mkvparser
  a4b68f8 parser : Fix bug in Chapters::Atom::Parse()
  bab0a00 cmake : Set library and project name the proper way on Windows.
  feeb9b1 Set library name to match Windows expectations.
  b9a549b Fix CMakefile to generate libwebm.a
  b386aa5 Add CMakeLists.txt and msvc_runtime.cmake.
  b0f8a81 parser : Fix memory leak in Chapter parsing
  f06e152 mkvmuxer : Fix MoveCuesBeforeClustersHelper recursive call.
  27bb747 allow subtitle tracks with ContentEncodings
  623d182 DoLoadCluster : tolerate empty clusters
  1156da8 Update PATENTS to reflect s/VP8/WebM/g
  0d4cb40 mkvmuxerutil : Use rand() in MSVC builds.
  e12fff0 mkvmuxer : Overload WriteEbmlHeader for backward compatibility
  a321704 mkvmuxer : write correct DocTypeVersion
  574045e mkvmuxer : fix DiscardPadding
  8be6397 Include crop elements when calculating size of Video element
  8f2d1b3 mkvparser : fix DiscardPadding extraction
  1c36c24 mkvmuxer : fix style guide violations
  568504e Merge "UUIDs can have their high bit set"
  acf788b Add support for CropLeft, CropRight, CropTop and CropBottom
  elements.
  418188b Merge "muxer : codec_id is a mandatory element"
  07688c9 mkvmuxer : Reject frames if invalid track number is passed.
  2a63e47 muxer : codec_id is a mandatory element
  d13c017 UUIDs can have their high bit set

  Change-Id : Iba28acb1ff774349d03e565f2641ddea132cf1e7

• Unable to playback .mp4 audio file in Firefox, works in Chrome

  22 octobre 2015, par SpartanVXL

  I have been trying to play a file through Firefox to see if it is compatible for a website and cannot figure out why it cannot play whereas it will play on Chrome okay. It simply shows a error box that the "video cannot be played because the file is corrupt". I’ve trawled through information on .mp4 files and Firefox’s supported codec types but have not found much aside from recent posts on how FF should be able to play this content in 2015. Here is a ffprobe of the file.

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'two.mp4':
Metadata:
   major_brand     : mp42
   minor_version   : 0
   compatible_brands: M4A mp42isom
   creation_time   : 2015-08-06 08:17:05
   encoder         : Nero AAC codec / 1.5.4.0
   Duration        : 00:03:28.77, start: 0.000000, bitrate: 131 kb/s
   Chapter #0:0    : start 0.027333, end 208.768000
   Metadata:
     title           :
   Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 96000 Hz, stereo, flt p, 128 kb/s (default)

  Any reason why this local file wouldn’t play through FF on Windows 41.0.2 ?