Chiebot-Mirror/FFmpeg - FFmpeg - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Rostislav Pehlivanov	7303962f14	aacenc_ltp: adjust and speed up autocorrelation calculations There were some errors in the calculation as well as an entire unnecessary loop to find the gain coefficient. Merge the two loops. Thanks to @ubitux for the suggestions and testing.	10 years ago
Rostislav Pehlivanov	4c9805538d	aacenc_ltp: correct header description comment	10 years ago
Rostislav Pehlivanov	b0a3c614b4	aacenc_ltp: replace av_clip() with av_clip_uintp2() Suggested by ubitux. Convenient.	10 years ago
Rostislav Pehlivanov	780dba01f9	aacenc_ltp: fix assertion A value of 2048 will overflow 11 bits.	10 years ago
Rostislav Pehlivanov	27d23ae074	aacenc: add support for encoding files using Long Term Prediction Long Term Prediction allows for prediction of spectral coefficients via the previously decoded time-dependent samples. This feature works well with harmonic content 2 or more frames long, like speech, human or non-human, piano music or any constant tones at very low bitrates. It should be noted that the current coder is highly efficient and the rate control system is unable to encode files at extremely low bitrates (less than 14kbps seems to be impossible) so this extension isn't capable of optimum operation. Dramatic difference is observable with some types of audio and speech but for the most part the audiable differences are subtle. The spectrum looks better however so the encoder is able to harvest the additional bits that this feature provies, should the user choose to enable it. So it's best to enable this feature only if encoding at the absolutely lowest bitrate that the encoder is capable of.	10 years ago