> Hi,
>
> august wrote
> > I'm sure you have thought about this more than I have, but wouldn't it
> > make sense to have the same low-level, but generic api for encoding as
> > well as decoding?
>
> Maybe it would make sense, but it wasn't necessary for achieving my goals.
>
> Actually the "level" is similar for encoding and decoding, because
> gmerlin-avdecoder exports pretty much exactly what a gmerlin input plugin
> needs, so
> the i_avdec.so is also a simple wrapper, like the encoding plugins.
>
> The only difference is, that the gmerlin-avdecoder plugin uses the
> gmerlin-avdecoder library, while e.g. the gmerlin ogg encoder plugin uses
> libogg/libtheora/libvorbis etc. directly.
>
> It was a pragmatic decision. Ideally one would not need an extra decoding
> library, but all available decoding libs sucked badly at the time
> I started the avdecoder. The reason for putting the whole decoding stuff
> into a single library was that all the formats share *lots* of code.
I guess that is what I don't understand. Why treat encoding differently
than decoding?
> > It seems almost crucial to me that the encoding libs should be away from
> > the display, audio/video output, and capture libs, no?
>
> Well they are somewhat separated because they are *plugins*, so an
> encoding plugin will never need libalsa for example. Also, all GUI related
> stuff is split off in libgmerlin_gtk. Only some plain Xlib stuff is in
> libgmerlin, because that's shared between the X11 output plugin, the X11
> grabber and lemuria.
>
> One issue could be that all plugins need the (somewhat large) libgmerlin.
> But any splitting here would mean a huge maintenance burdon.
It's not a problem to me if the plugins are optional.
Maybe I am just looking for symmetry where it is not actually there, but
my dream is to have some API like gavl/gmerlin_avdecoder as a
gavl/gmerlin_avencoder .
Something like:
-------------------------------------------------------
bgav_t *outfile;
bgav_open(outfile, video_format, audio_format);
// do some setup stuff...
bgav_endocode_params encode_params;
encode_params.bitrate=2000;
encode_params.iframe=30;
encode_params.quality=0.4;
bgav_set_encoding_params(outfile, encode_params);
while( imaginary_loop ) {
// generate audio/video in loop
bgav_write_audio(outfile, audio_frame, audio_stream);
bgav_write_video(outfile, video_frame, video_stream);
}
// do some followup, shut things down
bgav_close(outfile);
------------------------------------------------
I assume that can be done with gmerlin in some other way. I've been
looking into the source and doku for a while now, and admit I am slow,
but any suggestions on where to look or how I could do that using the
gmerlin plugin encoders?
thanks -august.
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