[Ffmpeg-devel] Differences between mencoder and ffmpegwhenencoding using x264 (original) (raw)

Wolfram Gloger wmglo
Mon Feb 27 11:51:28 CET 2006

Hi,

I started looking at this. The libavcodec side of it is easy enough. The problem is making ffmpeg.c use it. More specifically, it sets all the parameters in AVCodecContext before deciding which codec to use.

I've looked at this yesterday and well -- ffmpeg.c shouldn't do this, if only for preparation of the day when per-codec parameters arrive..

I would suggest for ffmpeg.c:

  1. When parsing options and recognizing them as codec options, don't do anything with them except storing them in opt_names[], opt_args[] arrays (this is already partially the case right now, opt_names[] already exists).

  2. For each input and output file, store an index into opt_names which is one past the last option valid for this file (important for per-file options)

  3. avcodec_open() gets three new parameters, or at least a new variant like:

int avcodec_open(AVCodecContext *s, AVCodec *codec, const char *opt_names[], const char *opt_args[], int opt_n)

In the future, this could also set options in contexts derived from AVCodecContext, e.g. when a "parent" pointer is added to AVClass.

Unfortunately, I won't have time to actually implement this before next week.

Regards, Wolfram.

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