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Audio Frame - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/engineering/audio-frame
The Zero-Crossing Rate (ZCR) of an audio frame is the rate of sign-changes of the signal during the frame. In other words, it is the number of times the signal changes value, from positive to negative and vice versa, divided by the length of the frame. The ZCR is defined according to the following equation:
c++ - FFmpeg av_read_frame returns packets from audio ...
https://stackoverflow.com/questions/51595363/ffmpeg-av-read-frame-returns-packets-from-audio-stream
Then when retrieving the frame data, it seams grabbing the audio channel. while (av_read_frame (pFormatCtx, &packet) >= 0) { // read returns 0 // Is this a packet from the video stream? if (packet.stream_index == videoStream) { //packet.stream_index == 1, which correspond to the audio stream } }
c++ - ffmpeg copies packet pts to frame pts during audio ...
https://stackoverflow.com/questions/70711098/ffmpeg-copies-packet-pts-to-frame-pts-during-audio-decoding-without-time-base-co
I have the MKV file.I am taking an audio stream from it and using ffmpeg and its opus decoder to decode audio packets into audio frames. The problem is that the resulting frames have unexpected presentation timestamps (pts): during decoding, ffmpeg just copies pkt->pts to frame->pts, ignoring the fact that the time base for pkt->pts is 1/1000, while for frame …
[MS-RTP]: RTP Packets | Microsoft Docs
https://docs.microsoft.com/en-us/openspecs/office_protocols/ms-rtp/3b8dc3c6-34b8-4827-9b38-3b00154f471c
Failure to do so can result in reduced audio quality at the receiving end. If silence suppression is disabled, the marker bit can be one for the first packet in the stream, but SHOULD <3> be zero for all other packets. In video streams, the marker bit MUST be one for the last packet sent for each video frame, and zero for all other packets.
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