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• Convert image and audio in background to Video file in React Native

  4 avril 2020, par Foram Trada

  I am trying to convert the images to video with audio in the background in React Native. I had used ffmpeg but I am not getting the expected result.
https://www.npmjs.com/package/react-native-ffmpeg
Here is the code that I had tried !

  



  RNFFmpeg.execute('-i http://192.168.43.4/ReactFirstProject/images/song.jpeg -i http://192.168.43.4/ReactFirstProject/screens/music/frog.wav -c:v mpeg4 output.mp4').then(result => (console.log("RESULT:",result)))


  



  Can anyone suggest any other libraries for doing the same ? Please help me out. I would be glad.

  


• Merge a sequence of JPEG images into a grid losslessly with FFmpeg

  20 janvier 2020, par Mody

  I have a sequence of images that are blocks of a larger image, which together make up the whole image. The blocks are the result of splitting the original image along evenly spaced horizontal and vertical lines, so they don’t have weird dimensions.

  Is there a way to combine them with FFmpeg (or something else like ImageMagick) without re-encoding the images ?

  This answer suggests the hstack or vstack FFmpeg filter, but my image blocks aren’t necessarily the full width or the full height of the original image.

  ---

  Like this :

  

  Perhaps this could be achieved with multiple FFmpeg commands using hstack or vstack (I’d prefer just one command though). Or with a complex filter ?

  ---

  e.g.

  ---

  Edit : I tried using filter_complex with FFmpeg :

  ffmpeg -i 0.jpg -i 1.jpg -i 2.jpg -i 3.jpg -i 4.jpg -i 5.jpg \
  
  -filter_complex "[0][1]hstack=inputs=2[row 0]; \
  
                   [2][3]hstack=inputs=2[row 1]; 
  
                   [4][5]hstack=inputs=2[row 2]; 
  
                   [row 0][row 1][row 2]vstack=inputs=3[out]" \
  
  -map "[out]" -c copy out.jpg

  but it can’t filter and copy streams at the same time.

• How to set comma delimited values from stdout ?

  28 octobre 2017, par gregm

  I have a batch file that processes the output of an ffprobe query. It retrieves several bits of data that I use to determine some ffmpeg directives. In particular I’m converting h264 videos into h265 if the video frame height is 720 or greater. I also convert the audio stream to aac if it isn’t already and if that stream is higher than 128 kbps I convert it down to 128.

  I can do all of that by calling ffprobe a number of times and use if statements to decide what my ffmpeg command will be.

  I’d like my batch file to be more efficient so I was thinking that if I could take the output of one (maybe two) ffprobe queries and then stick that output into a for /f token=.... loop then I could set each ffprobe data point to a variable and then just check the variables to decide what the resulting ffmpeg command will be.

  Here’s what I have right now to simply check if the video stream is hevc. If it isn’t then ffmpeg converts the video to hevc and copies the audio to aac.

  for %%a in ("*.*") do (
  
  ffprobe -v quiet -show_entries stream=index,codec_name,height -of csv "%%a" 2>&1 | findstr "hevc"
  
  if errorlevel 1 (
  
      ffmpeg.exe -hwaccel cuvid -i "%%a" -pix_fmt p010le -c:v hevc_nvenc -preset slow -rc vbr_hq -b:v 4M -maxrate:v 10M -c:a aac "%%~na.h265-convert.mp4"
  
  ))

  That ffprobe query output looks like this :

  stream,0,h264,480

  I was thinking if I could tokenize that output with something like :

  for /f "tokens=1,2,3,4 delims= " %%a in ("______") do set codec=%%b&set fheight=%%d

  I don’t know what to put in the spot where I have the _______. I really don’t want to create a temp file unless that’s the only option though.

  1) Is this an efficient way to achieve what I’m trying to do ?

  2) What do I use where I have a blank line above ________ to call the output of the ffprobe query to use in my for loop ?