[Libav-user] Programmatically setting bit_rate ?
Carl Eugen Hoyos
cehoyos at ag.or.at
Fri Nov 21 18:23:19 CET 2014
Philip Schneider <pjschneider at ...> writes:
> The sample code has "c->bit_rate = 400000”. For a
> moderate-sized image (1280 x 720) at 30fps, the
> resulting movie shows terrible visual artifacts
What kind of source material is this?
If is is interlaced, you have to tell the encoder.
If you don't tell the encoder, you either get very
bad quality or you need a very high bitrate.
> Given those caveats, can someone explain how I
> can programmatically set the bit_rate?
Do you mean "how do I set the bitrate"? Since you
answered it above, I don't understand the question.
Or do you mean "what value should I choose for
birate"? If you ask the question, I consider it an
indication that you actually want constant
Using a bitrate makes mostly sense if you have a
known upper limit.
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