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• How to write comments in batch files for ffmpeg ?

  10 octobre 2019, par Niraj

  I’m quite new to ffmpeg and writing batches for command-line. I have a bunch of ffmpeg batch files, for various video processing tasks, that I’d like to add comments to so that other users can understand them and customize as required. Can anyone advise on methods of adding comments ? Here’s a simplified example showing what I’ve tried :

  C:\some_location\ffmpeg.exe ^
  
  -i input_file -vsync cfr ^            rem /COMMENT_01
  
  -map 0:v ^                            rem /COMMENT_02
  
  -r 24000/1001 ^                       rem /COMMENT_03
  
  -pix_fmt yuv444p10le ^                rem /COMMENT_04
  
  -c:v prores_ks -profile:v 4444 ^      rem /COMMENT_05
  
  -map_metadata -1 ^                    rem /COMMENT_06
  
  output_file

  which gives the message : "Unable to find a suitable output format for ’rem’"

  C:\some_location\ffmpeg.exe ^
  
  -i input_file -vsync cfr ^            & :: /COMMENT_01
  
  -map 0:v ^                            & :: /COMMENT_02
  
  -r 24000/1001 ^                       & :: /COMMENT_03
  
  -pix_fmt yuv444p10le ^                & :: /COMMENT_04
  
  -c:v prores_ks -profile:v 4444 ^      & :: /COMMENT_05
  
  -map_metadata -1 ^                    & :: /COMMENT_06
  
  output_file

  which gives the message : "Trailing options were found on the commandline." And then none of the options are recognized as commands.

  C:\some_location\ffmpeg.exe ^
  
  rem /COMMENT_01
  
  -i input_file -vsync cfr ^
  
  rem /COMMENT_02
  
  -map 0:v ^
  
  rem /COMMENT_03
  
  -r 24000/1001 ^
  
  rem /COMMENT_04
  
  -pix_fmt yuv444p10le ^
  
  rem /COMMENT_05
  
  -c:v prores_ks -profile:v 4444 ^
  
  rem /COMMENT_06
  
  -map_metadata -1 ^
  
  output_file

  which gives the message : "Unable to find a suitable output format for ’rem’"

  Does anyone have any ideas ?

• ffmpeg - Audio not playing on iOS with transcoded video

  23 juin 2015, par Dev

  I am using Laravel 4.2.

  I am working on a project that provides video services. To transcode video (to play on all devices) I’ve used git-hub package php ffmpeg.

  By transcoding video, I found it is NOT working with iPhone 5s. I searched for solution and found some changes in parameters passed to the library.

  Finally, I come up with the command below that the library uses to transcode the video.

  ffmpeg -y -i video.mp4 -async 1 -metadata:s:v:0 start_time=0 -s 560x320 
  
      -vcodec libx264 -strict experimental -pix_fmt yuv420p -profile:v baseline 
  
      -acodec aac -profile:a aac_low -b:v 466k -refs 6 -coder 1 -sc_threshold 40 
  
      -flags +loop -me_range 16 -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 
  
      -trellis 1 -b:a 256k -ac 2 transcode_video.mp4

  The video is playing well but the audio is NOT working on iOS. Hence the video is playing without audio. I am using HTML 5 player to play the video and auto play option is off.

  Any suggestions ?

• Convert .heic to .jpg using ffmpeg ?

  19 novembre 2018, par Ketan Chauhan

  Using MP4Box :

  MP4Box -info IMG_5915.HEIC

  I get :

  prof colour profile not supported

  prof colour profile not supported

  Root Meta type : "pict" - 52 resource item(s)

  Primary Item - ID 49

  Item #1 - ID 1 - Name :
  .

  .

  .

  Item #49 - ID 49 - Name :

  Item #50 - ID 50 - Name : Item #51 - ID 51 - Name :

  File has no movie (moov) - static data container

  Then if I extract all of these :

  for i in seq 51 ; do MP4Box -dump-item $i:path=item$i.hevc
  IMG_5915.HEIC ; done

  Then if i continue, and convert these tiles to jpeg with ffmpeg it convert one tile to jpeg i.e it creates 51 HEVC tiles.

  ffmpeg -i item1.hevc -frames:v 1 -vsync vfr -q:v 1 -an image1.jpg

  How can I combine these tiles into a single jpg file ?