Recherche avancée

Sur d’autres sites (5798)

• FFMPEG video output size is too long

  12 mars 2021, par fahad

  I am trying to merge videos in FFmpeg reading through a .txt file, it merges the videos but increases the total timeline. Expected timeline is 2 minutes but after merging the videos the output file has a timeline of 18 hours.I am using the following command in my cmd :

  


  ffmpeg -f concat -i mylist.txt -c copy output.mp4

  


• fftools/ffmpeg : use a separate counter for encoded packet data size

  25 août 2022, par Anton Khirnov

  fftools/ffmpeg : use a separate counter for encoded packet data size
  update_video_stats() currently uses OutputStream.data_size to print the
  
  total size of the encoded stream so far and the average bitrate.
  
  However, that field is updated in the muxer thread, right before the
  
  packet is sent to the muxer. Not only is this racy, but the numbers may
  
  not match even if muxing was in the main thread due to bitstream
  
  filters, filesize limiting, etc.
  Introduce a new counter, data_size_enc, for total size of the packets
  
  received from the encoder and use that in update_video_stats(). Rename
  
  data_size to data_size_mux to indicate its semantics more clearly.
  No synchronization is needed for data_size_mux, because it is only read
  
  in the main thread in print_final_stats(), which runs after the muxer
  
  threads are terminated.
  

  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_mux.c

• Working with -filter_complex in ffmpeg with a batch concat array

  21 avril 2014, par user3555008

  What I am trying to do here is write an ffmpeg script that takes all songs from a folder and combines them into one audio file using the command line in Windows.

  So far I have

  ffmpeg -i "pathforinput1" -i "pathforinput2" -i "pathforinputn" -filter_complex "[0:0] [1:0] concat=n=(number of songs goes here):v=0:a=1 "[a]"" -map "[a]" -acodec libmp3lame -ab 320k "output file.mp3"

  My problem is that I want to combine it with the existing script :

  for %A in ("input folder\*.extension") do ffmpeg

  to create a total script that uses -i "%A" for the input. The problem I am having here is that each input file requires an entry in the array -filter_complex "[0:0] [1:0] as well as having the total number of input files present in concat=n=(number of files). I’ m willing to use a batch script to make this possible, but I can’t see how I would go about finding the total number of files in a folder and then creating an array for each (for example if there were 7 songs the array would be [0:0] [1:0] [2:0] [3:0] [4:0] [5:0] [6:0]).

  Any help or pointers for making this possible would be great. Someone in this question managed to make something similar for a Unix system but I am using batch files and I don’t know how to modify it for Windows.

  Thanks in advance for any help

  Ok, progress made with the help of the first commenter. However, I think ffmpeg isn’t liking what I’ve made. My code thus far is :

  :: Give you a list of the .wav filenames in -i "filename1" -i "filename2" format
  
  
  
  for %%a in ("C:\Users\James\Input\*.*") do call set var=%%var%% -i "%%a"
  
  echo %var%
  
  
  
  :: Give you the number of .mp3 files
  
  
  
  for /f %%a in ('dir "C:\Users\James\Input\*.*" /b /a-d ^|find /c /v "" ') do set "numfiles=%%a"
  
  echo there are "%numfiles%" files
  
  set /a totalnum=numfiles
  
  
  
  :: dir "C:\Users\James\Input\" /b >> C:\Users\James\Output\filelist.txt
  
  :: print some text
  
  set /a numfiles=numfiles-1
  
  for /L %%b in (0,1,%numfiles%) do call set array=%%array%% [%%b:0]
  
  :: for /L %%b in (0,1,%numfiles%) do call set array=%%array%% [0:0]
  
  echo %array%
  
  for /f "tokens=* delims= " %%C in ('echo %array% ') do set array=%%C
  
  set array=%array:~0,-1%
  
  echo %array%
  
  :: for %%d in ("C:\Users\James\Input\*.*") do ffmpeg -i "%%d" -filter_complex "%array% concat=n=%totalnum%:v=0:a=1 "[a]"" -map "[a]" -acodec libmp3lame -ab 320k "C:\Users\James\Output\outputtestbatch1.mp3"
  
  for %%d in ("C:\Users\James\Input\*.*") do ffmpeg -i "%%d" -filter_complex "%array% concat=n=%totalnum%:v=0:a=1 "[a]"" -map "[a]" -acodec libmp3lame -ab 320k "C:\Users\James\Output\outputtestbatch1.mp3"
  
  pause`

  The issue I am having now is that I think ffmpeg is assuming each input file has audio stream [0:0] rather than incrementing them one after the other. Is there a way to fix this with the input method I’m using ?

  **SECOND EDIT**L : Success ! I modified foxidrive’s script a bit because it was slightly misconfigured. Final product is here :

  @echo off
  
  
  
  for %%a in ("C:\Users\James\Input\*.*") do call set var=%%var%% -i "%%a"
  
  :: echo %var%
  
  :: Give you the number of files
  
  
  
  for /f %%a in ('dir "C:\Users\James\Input\*.*" /b /a-d ^|find /c /v "" ') do set "numfiles=%%a"
  
  echo there are "%numfiles%" files
  
  
  
  for /L %%b in (0,%numfiles%) do call set array=%%array%% [%%b:0]
  
  set array=%array:~1%
  
  echo "%array%"
  
  
  
  ffmpeg %var% -filter_complex "%array% concat=n=%numfiles%:v=0:a=1 "[a]"" -map "[a]" -acodec libmp3lame -ab 320k "C:\Users\James\Output\outputtestbatch1.mp3"
  
  
  
  popd    
  
  pause