ReSearchIT Eng <researchiteng@...> writes: > the input or the output format?
As said, this is difficult to understand: FFmpeg / libavcodec support decoding audio (to raw audio, different formats depending on the input) and encoding audio (from raw audio, format depending on the encoder you requested, unfortunately not on what the user wishes). Some options apply to both encoding and decoding, some only for encoding, others only to decoding. "bit_rate" (to use one example) is only useful for encoded audio, not for the raw audio the decoder provides and the encoder needs. The documentation in avcodec.h explains it (or at least I believe so): /** * the average bitrate * - encoding: Set by user; unused for constant quantizer encoding. * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream. */ int bit_rate; One more thing: When decoding, you absolutely have to test sample_fmt: Do not rely on the fact that today you get s16 because this may change in the future! (without major version bump!) Similar with encoding: It may work fine with fltp at the moment but the encoder that you get at runtime in the future may need another format! Hope that helps, Carl Eugen _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
