I built a segment that accepts video and h264 / AAC segments as input according to the HLS specification. The source code for it can be seen here: https://gist.github.com/cpnielsen/f36729c371aac0fe535d
It is implemented as a python extension, but the interesting parts are in the process_video() function. It uses the libav library (alternatively ffmpeg ) for heavy lifting.
It works 95% of the time, but we come across some videos where it creates segments with audio sync. If I used the command line tool, I could just add -async 1 to fix it, but how to implement the same functionality in my C code?
I found a code snippet in avconv_filter.c (for libav , not sure what the equivalent of ffmpeg ) where they trigger the filter, but without any documentation it’s hard to figure out how to do this outside the whole modular configuration.
I just need to:
- Initiate the correct filter
- Apply it to input (or output? Not sure)
- Be aware of any errors when using the filter.
Any help is appreciated; code sample, filter description, etc.
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