FFmpeg-iOS | Swift package of FFmpeg libraries for iOS | iOS library

To do what you want, you have to use your compiled FFmpeg library in your code.

What you are looking for is exactly the code providing by FFmpeg documentation libavformat/output-example.c (that mean AVFormat and AVCodec FFmpeg's libraries in general).

Stackoverflow is not a "do it for me please" platform. So I prefer explaining here what you have to do, and I will try to be precise and to answer all your questions.

I assume that you already know how to link your compiled (static or shared) library to your Xcode project, this is not the topic here.

So, let's talk about this code. It creates a video (containing video stream and audio stream randomly generated) based on a duration. You want to create a video based on a picture list and sound file. Perfect, there are only three main modifications you have to do:

• The end condition is not reaching a duration, but reaching the end of your file list (In code there is already a #define STREAM_NB_FRAMES you can use to iterate over all you frames).
• Replace the dummy void fill_yuv_image by your own method that load and decode image buffer from file.
• Replace the dummy void write_audio_frame by your own method that load and decode the audio buffer from your file.

(you can find "how to load audio file content" example on documentation starting at line 271, easily adaptable for video content regarding documentation)

In this code, comparing to your CLI, you can figure out that:

• const char *filename; in the main should be you output file "result.mp4".
• #define STREAM_FRAME_RATE 25 (replace it by 30).
• For MP4 generation, video frames will be encoded in H.264 by default (in this code, the GOP is 12). So no need to precise libx264.
• #define STREAM_PIX_FMT PIX_FMT_YUV420P represents your desired yuv420p decoding format.

Now, with these official examples and related documentation, you can achieve what you desire. Be careful that there is some differences between FFmpeg's version in these examples and current FFmpeg's version. For example:

I've tried mobile-ffmpeg, and it works (swift 4.2 - Xcode 10.1)
installation is very easy by cocoapods pod 'mobile-ffmpeg-full-gpl', '~> 4.2'
you can use different binaries if you don't need all features, for example: pod 'mobile-ffmpeg-min', '~> 4.2' link

for using in swift you should add ProjectName-Bridging-Header.h to your project and then import the library in that: #import

you can run a command like this in swift (converting mkv to mp4):

Fixed it. Following is missing in the linker list

I was able to implement this using this code for decoding and this code to actually write the WAV header/body.

As an added bonus, this was very helpful in decoding NSData instead of a file.

Here is my finished decoder, though I wouldn't expect it to work in any case except mine.