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• Header missing in mpg, in spite of using avformat_write_header

  23 novembre 2012, par TheSHEEEP

  I am encoding a live rendered video to mpg and/or mp4 (depends on the later usage of the video) using the ffmpeg C API. When encoding to mp4, everything is well. But when encoding to mpg, the resulting video cannot be played by any player. A quick call to ffprobe on it reveals that the header is missing. But this seems pretty much impossible, as I am explicitly writing it.

  This is how I write the header, before any frame is encoded :

  // ptr->oc is the AVFormatContext
  
  int error = avformat_write_header(ptr->oc, NULL);
  
  if (error < 0)
  
  {
  
      s_logFile << "Could not write header. Error: " << error << endl;
  
      fprintf(stderr, "Could not write header. Error: '%i'\n", error);
  
      return 1;
  
  }

  There never is any error when writing the header.

  For encoding, I am following the official muxing.c example, so I do set the CODEC_FLAG_GLOBAL_HEADER flag. I use CODEC_ID_MPEG2VIDEO (for video) and CODEC_ID_MP2 (for audio).

  The result mpg does work when I "encode" it in an additional step with an external ffmpeg executable like this : "ffmpeg -i ownEncoded.mpg -sameq -y working.mpg".
  So it seems all the data is there, only the header is missing for some reason...

  Here is the only thing ffmpeg is reporting before/when writing the header :

  mpeg -------------------
  
  lvl: 24
  
  msg: VBV buffer size not set, muxing may fail

  Could that be the problem ?

  I wonder what could be wrong here as I encode mp4 with the exact same function, except setting some special values like qmin, qmax, me_method, etc. when encoding to mp4. Do I probably have to set any special values so that ffmpeg really does write the header correctly ?

• Noobs approach to automate x264 cmd

  16 novembre 2012, par nightcrawler

  so here is my script to loop through specific video extensions » add a manual profile » generate necessary *.bat & finally a final 'loader' batch file to execute previous *.bat files sequentially & necessary logging (this gives quiet a deal of freedom if you so want)

  ::==
  
  :: gets lines into vars c1 v2 v...
  
  @echo off
  
  :: user input required
  
  cd /d "d:\Trainers\out\"
  
  setLocal EnableDelayedExpansion
  
  dir /B /O:N | findstr ".wmv$ " >filename.txt
  
  echo. >log.txt
  
  :: user input required
  
  for /f "tokens=* delims= " %%a in ('type filename.txt ^|findstr ".wmv$"') do (
  
  set /a n+=1
  
  echo. >file!n!.bat
  
  set in=%in%%%a
  
  :: user input required
  
  set out=!in:.wmv=.mp4!
  
  :: user input required
  
  set v=x264 --crf 23  --level 3.1 --tune film -o "d:\Trainers\out\!in!" "d:\Trainers\out\!out!"
  
  echo. !v!>file!n!.bat
  
  )
  
  dir /B /O:N | findstr ".bat$ " >x264_home.txt
  
  for /f "tokens=* delims= " %%a in (x264_home.txt) do (
  
  set /a n+=1
  
  :: mtee is an external library Google it
  
  set "z=call %%a | mtee /d/c/t/+ log.txt"
  
  echo. !z! >> x264_home.bat
  
  )
  
  echo. @echo off > newFile.bat
  
  type x264_home.bat >> newFile.bat
  
  type newFile.bat > x264_home.bat
  
  del newFile.bat,x264_home.txt,filename.txt
  
  echo. pause >> x264_home.bat
  
  echo. @echo All Operation done... >> x264_home.bat
  
  :: user input required
  
  move "d:\Trainers\out\*.bat" "d:\Program Files\x264_auto\test\"
  
  :: user input required
  
  move "d:\Trainers\out\log.txt" "d:\Program Files\x264_auto\test\"
  
  ::==

  Now the above code which is fairly easy to understand (bcz its written by a noob) run perfectly & create necessary files. For instance one of the file1.bat looks like this :

  x264 --crf 23  --level 3.1 --tune film --preset veryslow --deblock -2:-1 --zones 24233,25324,q=20 --acodec aac --abitrate 80 -o "d:\Trainers\out\1.wmv" "d:\Trainers\out\1.mp4"

  ...& the loader .bat file looks like

   @echo off 
  
   call file1.bat | mtee /d/c/t/+ log.txt 
  
   call file2.bat | mtee /d/c/t/+ log.txt
  
   call file3.bat | mtee /d/c/t/+ log.txt
  
   @echo All Operation done... 

  You see this is a quiet flexible approach in that you can use special filestr » set another loop » set another profile. Furthermore every batch file can be latter edited especiialy when you heavily use --zone x264 feature
  I am successful because there is no error in any output ...but its the x264.exe (provider/compiler x264GUI) throws error which it otherwise don't ?

  d:\Program Files\x264_auto\test>x264 --crf 23  --level 3.1 --tune film --preset
  
  veryslow --deblock -2:-1 --zones 24233,25324,q=20 --acodec aac --abitrate 80 -o
  
  "d:\Trainers\out\1.wmv" "d:\Trainers\out\1.mp4"
  
  ffms [error]: could not create index
  
  lavf [error]: could not open input file
  
  raw [error]: raw input requires a resolution.
  
  x264 [error]: could not open input file `d:\Trainers\out\1.mp4' via any method!

  its the x264 thats the culprit perhaps a senior guide is required here

• Revision 34324a98e7 : Restore vp9_asm_enc_offsets.c The previous commit 15255ee "Move dequant from BL

  26 avril 2013, par John Koleszar

  Changed Paths :
   Add /vp9/encoder/vp9_asm_enc_offsets.c

  
  
  Restore vp9_asm_enc_offsets.c

  The previous commit 15255ee "Move dequant from BLOCKD to per-plane MACROBLOCKD"
  removed the vp9_asm_enc_offsets.c file, but didn't update the various secondary
  build systems that special case these files. Restore it for now, to ensure any
  in-progress changes and builds continue working, to allow time to more carefully
  coordinate removal of these files.

  Change-Id : I24b78db3fb874d5fbd226548b7366a05ed98e536