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• avcodec/ac3dec : Keep track of band structure

  13 mai 2017, par Michael Niedermayer

  avcodec/ac3dec : Keep track of band structure
  It is needed in some corner cases that seem not to be forbidden
  
  Fixes : out of array index
  
  Fixes : 1538/clusterfuzz-testcase-minimized-4696904925446144
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/ac3dec.c
  • [DH] libavcodec/ac3dec.h

• How to add timecode & Hint Track after concat 2x MP4 to MOV (Quicktime Playback) FFMPEG

  17 février 2019, par Venkatesh R

  What I am trying to achieve :
  After concat 2 files with filter_complex i need to add timecode track and Hint track to the MOV file.

  2x MP4 files >> MOV ( Timecode Track (default:Yes) + Hint Track ( Default:No)

  Issues :

  1. Timecode track is not showing as a tag while playing in QT player like attached screen shot.
  2. If I add Hint Config -movflags rtphintin below command that throws error in quicktime player Error -2002: a bad public movie atom was found in the movie ()

  I have tried below code :

  ffmpeg -ss 00:00:00.000 -t 00:01:00.000 -i Input1.mp4 -ss 00:01:00.001 -t 00:01:00.000 -i Input2.mp4 -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1[v] [a]" -map "[v]" -c:v libx264 -aspect 4:3 -s 352:288 -coder 1 -profile:v main -level 3.1 -pix_fmt yuv420p -preset ultrafast -video_track_timescale 25 -g 12 -r 25 -bf 2 -refs 1 -x264-params "keyint_min=12:nal-hrd=cbr:b-pyramid=0" -b:v 2000k -minrate 2000k -maxrate 2000k  -map "[a]" -codec:a libfdk_aac -b:a 192k -vbr 4 -ac 2 -async 1 -timecode 09:59:59:10 -f mov 18785_V1.mov

  ---

  > FFMPEG Media Info : ID                                       : 3
  
  Type                                     : Time code
  
  Format                                   : QuickTime TC
  
  Duration                                 : 2 min 0 s
  
  Time code of first frame                 : 09:59:59:10
  
  Time code, striped                       : Yes
  
  Language                                 : English
  
  Default                                  : No

  Comparison Screenshot of Hardware vs FFMPEG Transcoder

  

• Replacing the audio track in the video with ffmpeg

  14 décembre 2019, par becauseim

  ffmpeg -i source_video.mp4 -i new_audio.aac -c:v copy -map 0:v:0 -map 1:a:0 -shortest new.mp4

  I’m a video editor and I often have to replace the audio track in a video file without decoding.

  This command replaces the audio track in the video file, but it is necessary to specify the names of the input files exactly.

  Please tell me :

  1. Can you tell me how not to write the name of the files by specifying only their extension ? To call the same command in a folder with different files.

  2. So that the resulting file has an identical name to the input video file, but with a postfix in the form of date and time, for example, source_video_14.12_14:50.mp4

  Thank you !