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• How to combine a video with audio from another video using FFMPEG ?

  21 août 2023, par Sigmond Kukla

  I have two videos of the same length that I'd like to combine. Video A has audio, video B does not. I'd like to take the audio from video A and put it onto Video B. I'd like to do this with FFMPEG, but I can't figure out the arguments I need ? Should I use map ?

  


  There's a lot of questions about combining a video with audio, but not two videos.

  


  Do I maybe need an intermediate step of converting my original video to audio ?

  


  I have tried using this FFMPEG command, and a couple of variations. All of the resulted in just Video A (the one with audio) being the output.

  


  ffmpeg -i videoB.mp4 -i video A.mp4 -c:v copy -c:a aac output.mp4


  


• FFmpeg v0.12 is not working for Angular 16

  30 septembre 2024, par Amrut Kumar

  Currently, I have tried integrating ffmpeg v0.12 for my angular 16 project. But it takes forever for the ffmpeg to load. It goes into infinite loop. My guess is that its unable to load the worker script due to incompatibility with Angular 16 dependencies and functionalities.
I have tried ffmpeg v0.12 in my angular 18 app and everything is working just fine. The same changes wont work for my angular 16 application.
To take a step further, I have downgraded ffmpeg version to 0.11 and its now working perfectly fine for my angular 16 app.
Have any of you faced similar issue as I have explained above ? If yes, what steps did you take to resolve it ?

  


  I tried loading ffmpeg v0.12 with angular 16 app and I was expecting it to load just fine as I was able to achieve this with angular 18 with totally similar code changes.

  


• Dividing, processing and merging files with ffmpeg

  9 novembre 2015, par João Carlos Santos

  I am trying to build an application that will divide an input video file (usually mp4) into chunks so that I can apply some processing to them concurrently and then merge them back into a single file.

  To do this, I have outlined 4 steps :

  1. Forcing keyframes at specific intervals so to make sure that each
     chunk can be played on its own. For this I am using the following
     command :

     ffmpeg -i input.mp4 -force_key_frames
"expr:gte(t,n_forced*chunk_length)" keyframed.mp4

     where chunk_length is the duration of each chunk.

  2. Dividing keyframed.mp4 into multiple chunks.
     Here is where I have my problem. I am using the following command :

     `ffmpeg -i keyframed.mp4 -ss 00:00:00 -t chunk_length -vcodec copy -acodec copy test1.mp4`

     to get the first chunk from my keyframed file but it isn’t capturing
     the output correctly, since it appears to miss the first keyframe.

     On other chunks, the duration of the output is also sometimes
     slightly less than chunk_length, even though I am always using the
     same -t chunk_length option

  3. Processing each chunk For this task, I am using the following
     commands :

     ffmpeg -y -i INPUT_FILE -threads 1 -pass 1 -s 1280x720 -preset
medium -vprofile baseline -c:v libx264 -level 3.0 -vf
"format=yuv420p" -b:v 2000k -maxrate:v 2688k -bufsize:v 2688k -r 25
-g 25 -keyint_min 50 -x264opts "keyint=50:min-keyint=50:no-scenecut" -an -f mp4 -movflags faststart /dev/null
     ffmpeg -y -i INPUT_FILE -threads 1 -pass 2 -s 1280x720 -preset
medium -vprofile baseline -c:v libx264 -level 3.0 -vf
"format=yuv420p" -b:v 2000k -maxrate:v 2688k -bufsize:v 2688k -r 25
-g 25 -keyint_min 50 -x264opts "keyint=50:min-keyint=50:no-scenecut" -acodec libfaac -ac 2 -ar 48000 -ab 128k -f mp4 -movflags faststart OUTPUT_FILE.mp4

     This commands are not allowed to be modified, since my goal here is
     to parallelize this process.

  4. Finally, to merge the files I am using concat and a list of the
     outputs of the 2nd step, as follows :

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

  In conclusion, I am trying to find out a way to solve the problem with step 2 and also get some opinions if there is a better way to do this.