Hi,
Thanks for your quick reply. I have another related question. If there is negative pts/dts in packet output from audio encoder, the total duration of output audio packets will be bigger than original audio duration. Are those packets with negatvie pts/dts useful in audio decoding process? Can I discard those packets with negative pts/dts? I want to mux video and audio streams into one mp4 file, but there are several audio packets with negtive pts/dts at the beginning, and pts/dts of video packets start from 0. How to put those packets with negtive pts/dts into mp4 file? Thanks! B.R. Andrew At 2015-10-09 16:49:57, "Hendrik Leppkes" <[email protected]> wrote: >On Fri, Oct 9, 2015 at 7:53 AM, qw <[email protected]> wrote: >> Hi, >> >> I use avcodec_encode_audio2() to call aac encoder to compress audio. >> AVFrame::pts is set to 0 for 1st frame, 1 for 2nd frame, 2 for 3rd frame, >> and so on. But I find pts and dts are negtive values in 1st two output >> packets, and 3rd packet's pts/dts is 0. Why pts and dts are less than 0 in >> 1st two output packets? > >Encoders will produce negative timestamps when they have a delay. >Otherwise they would cause A/V desync, since the audio is delayed. >_______________________________________________ >Libav-user mailing list >[email protected] >http://ffmpeg.org/mailman/listinfo/libav-user
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