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• Concat two mp4 files with MP4Box error : Bad Parameter [on hold]

  6 février 2014, par user3279646

  I'm trying to concat two mp4 files. But I get an error : Bad Parameter

  Can someone help me with this problem ?

  I'm using de debian packages. On a previously version it worked fine. I moved from a old debian version to the new one and I also had to change the ffmpeg to avconv which I use to create these mp4 files. I also had to change the audio codec to '-acodec aac -strict experimental'

  Kind Regards,
  Marcel

      MP4Box -force-cat -cat conv1-1391608417314.mp4 -add conv1-1391608417345.mp4 -new output.mp4
  
      IsoMedia import - track ID 1 - Video (size 384 x 288)
  
      Error importing conv1-1391608417345.mp4: Bad Parameter

  ---

      MP4Box -info conv1-1391608417314.mp4
  
      Movie Info 
  
      Timescale 1000 - Duration 00:00:23.985
  
      Fragmented File no - 2 track(s)
  
      File Brand isom - version 512
  
      Created: UNKNOWN DATE
  
      File has root IOD (9 bytes)
  
      Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
  
      Visual PL: Not part of MPEG-4 Visual profiles (0xfe)
  
      Audio PL: Not part of MPEG-4 audio profiles (0xfe)
  
      No streams included in root OD
  
  
  
      iTunes Info:
  
      Encoder Software: Lavf53.21.1
  
  
  
      Track # 1 Info - TrackID 1 - TimeScale 1000 - Duration 00:00:23.985
  
      Media Info: Language "Undetermined" - Type "vide:avc1" - 23988 samples
  
      Visual Track layout: x=0 y=0 width=384 height=288
  
      MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
  
      AVC/H264 Video - Visual Size 384 x 288
  
      AVC Info: 1 SPS - 1 PPS - Profile High @ Level 4.2
  
      NAL Unit length bits: 32
  
      Self-synchronized
  
  
  
      Track # 2 Info - TrackID 2 - TimeScale 44100 - Duration 00:00:23.962
  
      Media Info: Language "Undetermined" - Type "soun:mp4a" - 1032 samples
  
      MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
  
      MPEG-4 Audio MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 44100
  
      Synchronized on stream 1
  
      Alternate Group ID 1

  ---

      MP4Box -version
  
      MP4Box - GPAC version 0.5.0-rev
  
      GPAC Copyright: (c) Jean Le Feuvre 2000-2005
  
      (c) ENST 2005-200X
  
      GPAC Configuration: --build=x86_64-linux-gnu --prefix=/usr --includedir=${prefix}/include --mandir=${prefix}/share/man --infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --libdir=${prefix}/lib/x86_64-linux-gnu --libexecdir=${prefix}/lib/x86_64-linux-gnu --disable-maintainer-mode --disable-dependency-tracking --prefix=/usr --mandir=${prefix}/share/man --libdir=lib/x86_64-linux-gnu --extra-cflags='-Wall -fPIC -DPIC -I/usr/include/mozjs -DXP_UNIX' --enable-joystick --enable-debug --disable-ssl
  
      Features: GPAC_HAS_JPEG GPAC_HAS_PNG

• Is there a way to filter out I/B/P frames in an MPEG Video stream and access the macroblock information ?

  1er mars 2014, par Vixian

  I am trying make a program for video analysis of MPEG streams in C or C++.

  I was able to find out the frame types in a video file using

  ffprobe -show_frames -pretty File.mpg | grep 'pict_type' > pict_type.txt

  However based on the order of the frames, it seems that they are in "display" (IBBPBBP...) order not in "transmission" order (IPBBPBBPBB...) and it's not exactly ideal way of doing things as I can't assure the command didn't skip any frames or anything as it's outside of my program.

  I have tried OpenCV, but it appears the information I require is too low-level for OpenCV and I believe the solution lies in ffmpeg or libavcodec but the documentation is a nightmare past the CLI. Although I am open to other solutions !

  The information I require are :

  • The type of each frame (I, B, or P)
  • The total number of macroblocks inside a frame
  • The number of intra-coded macroblocks inside a P frame
  • The number of both forward and backward predicted macroblocks inside a B frame
  • The number of just backward predicted macroblocks inside a B frame
  • The number of just forward predircted macroblocks inside a B frame

  I would be very grateful for your help !

• Révision 22981 : ne plus limiter la longueur maxi des logins dans test_login()

  12 avril 2016, par brunobergot@gmail.com

  ce comportement datait de 2005 cf https://github.com/spip/SPIP/commit/36791355d98365fdb272068837c65c210c14d968#diff-ff8f8af2b5be1267c742e9ff2c905087 (désolé pour le lien github, mais redmine ne sait pas afficher de révision aussi ancienne)