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• Using ffmpeg library

  29 juillet 2014, par DAVIDBALAS1

  Thx all for helping <3

  So, I have downloaded the ffmpeg library, imported it to eclipse, added it as a library to my android application and tried to use it, it doesn’t work.

  Step by step :

  • Downloaded this file : https://github.com/guardianproject/android-ffmpeg-java
  • Extracted it to an empty folder.
  • At Eclipse, "import" and then I have selected this empty folder.
  • Right click at my project, properties, android, added the ffmpeg library.

  • At my on create I used this code(just for checking) :

    ffmpeg -t 30 -i inputfile.mp3 -acodec copy outputfile.mp3

  But I get a lot of errors :

  Multiple markers at this line
  
  - Syntax error on token(s), misplaced 
  
   construct(s)
  
  - Syntax error on token "inputfile", delete this 
  
   token
  
  - Syntax error on token "30", delete this token
  
  - Syntax error on token ".", ; expected

  Can you see my problem ?

• Inserting clips into mp4 via ffmpeg

  15 septembre 2024, par lfgan

  I am looking to create mp4 files by combining multiple static mp4s and mp3s.&#xA;I have a script already to convert mp3 to mp4 and using the album art as a static background image, and inserting the intro.&#xA;What I am having problems with is that it cannot concatenate the videos reliably, or at all for that matter.

  &#xA;

  This is the code that I currently have, it is ChatGPT, however I gave up as it seemed like it was just running in circles.

  &#xA;

  setlocal

:: Set variables
set "mp3file=myfile.mp3"
set "coverart=extracted_cover.jpg"
set "outputfile=music.mp4"
set "introfile=intro.mp4"
set "outputendfile=Outro.mp4"
set "wowfile=Wow!.mp4"

:: Step 1: Extract cover art from MP3
ffmpeg -i "%mp3file%" -an -vcodec copy "%coverart%"
if %errorlevel% neq 0 (
    echo Error: Failed to extract cover art from MP3 file.
    exit /b 1
)

:: Step 2: Convert MP3 to MP4 using the extracted cover art
ffmpeg -loop 1 -i "%coverart%" -i "%mp3file%" -c:v libx264 -tune stillimage -c:a aac -b:a 192k -shortest "%outputfile%"
if %errorlevel% neq 0 (
    echo Error: Conversion from MP3 to MP4 failed.
    exit /b 1
)

:: Step 3: Randomly generate two positions for Wow!.mp4 insertions
:: Random positions will be between 10 and 50 seconds
set /a "pos1=%random% %% 40 + 10"
set /a "pos2=%random% %% 40 + 10"

:: Ensure pos1 and pos2 are different
if %pos1% EQU %pos2% (
    set /a "pos2=%pos1%+10"
)

:: Print positions for debugging
echo Random insertion positions:
echo Position 1: %pos1%
echo Position 2: %pos2%

:: Step 4: Split the music mp4 into parts at the random positions
:: Part 1: From the beginning to pos1
ffmpeg -i "%outputfile%" -c copy -ss 0 -to %pos1% -y "part1.mp4"
if not exist "part1.mp4" (
    echo Error: Failed to create part1.mp4
    exit /b 1
)

:: Part 2: From pos1 to pos2
ffmpeg -i "%outputfile%" -c copy -ss %pos1% -to %pos2% -y "part2.mp4"
if not exist "part2.mp4" (
    echo Error: Failed to create part2.mp4
    exit /b 1
)

:: Part 3: From pos2 to the end
ffmpeg -i "%outputfile%" -c copy -ss %pos2% -y "part3.mp4"
if not exist "part3.mp4" (
    echo Error: Failed to create part3.mp4
    exit /b 1
)

:: Step 5: Concatenate the files in the required order
(
    echo file 'intro.mp4'
    echo file 'part1.mp4'
    echo file 'Wow!.mp4'
    echo file 'part2.mp4'
    echo file 'Wow!.mp4'
    echo file 'part3.mp4'
    echo file 'Outro.mp4'
) > concat_list.txt

ffmpeg -f concat -safe 0 -i concat_list.txt -c copy final_output.mp4
if %errorlevel% neq 0 (
    echo Error: Failed to concatenate the video files.
    exit /b 1
)

:: Cleanup
del part1.mp4 part2.mp4 part3.mp4 concat_list.txt "%coverart%"

echo Done! The final video is saved as final_output.mp4


  &#xA;

  exactly what it is supposed to do :

  &#xA;

  &#xA;
  1. Convert "myfile.mp3" to "music.mp4" with image (works)

  &#xA;

  2. Add "intro.mp4" to the start of "music.mp4" and "Output.mp4" to the end (works)

  &#xA;

  3. Split "music.mp4" into 3 parts, randomly, at a minimum 10s after intro.mp4 and 10s before Outro.mp4 (can for some reason only create part 1)

  &#xA;

  4. Put all clips in order (unknown, probably works but part 2 and 3 wont generate so it cannot get to that step.)

  &#xA;

  &#xA;

  Edit :&#xA;I forgot to add the error message that I am getting. Here it is :

  &#xA;

  [out#0 @ 000002e024a6ed00] -to value smaller than -ss; aborting.
Error opening output file part2.mp4.
Error opening output files: Invalid argument
Error: Failed to create part2.mp4


  &#xA;

• Building ffmpeg on Windows

  27 février 2014, par Niranjan

  I've the source code of ffmpeg and would like to build it in my win7. I've minGW installed on my machine. I found a step by step instruction from this link :

  http://www.gooli.org/blog/building-ffmpeg-for-windows-with-msys-and-mingw/

  The link 'Download updated bash for MSYS' did not follow. It showed the file is not found. When I try to build the program the way explained in the site, it shows an error :

  Unknown option “–extra-cflags=-mno-cygwin”.
  See ./configure –help for available options.
  ./myconfig : –extra-ldflags=-Wl,–add-stdcall-alias : command not found
  ./myconfig : –target-os=mingw32 : command not found

  From a similar question posted here, I followed the link http://ffmpeg.arrozcru.org/ but the static build downloaded from the site was corrupted. Pls help.