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media player - ffmpeg av_seek_frame with …
https://stackoverflow.com/questions/20734814/ffmpeg-av-seek-frame-with-avseek-flag-any-causes-grey-screen
void seekFrame(unsigned frameIndex) { // Seek is done on packet dts int64_t target_dts_usecs = (int64_t)round(frameIndex * (double)m_video_stream->r_frame_rate.den / m_video_stream->r_frame_rate.num * AV_TIME_BASE); // Remove first dts: when non zero seek should be more accurate auto first_dts_usecs = (int64_t)round(m_video_stream->first_dts * …
ffmpeg tutorial - dranger.com
http://dranger.com/ffmpeg/tutorial07.html
Seeking centers around the av_seek_frame function. This function takes a format context, a stream, a timestamp, and a set of flags as an argument. The function will seek to the timestamp you give it. The unit of the timestamp is the time_base of the stream you pass the function.
av_seek_frame (ffmpeg.libavformat.avformat.av_seek_frame)
https://ffmpeg4d.dpldocs.info/ffmpeg.libavformat.avformat.av_seek_frame.html
av_seek_frame. ffmpeg libavformat avformat. Seek to the keyframe at timestamp. 'timestamp' in 'stream_index'. @param s media file handle @param stream_index If stream_index is (-1), a default stream is selected, and timestamp is automatically converted from AV_TIME_BASE units to the stream specific time_base. @param timestamp Timestamp in …
using ffmpeg to demux stream(video h.264 , audio aac) and ...
http://joyxu.github.io/2017/03/06/ffmpeg-demux-seek/
6 read frame from stream by calling ‘av_read_frame’ 7 check the type of stream(audio or video) 8 after read all the frame calling ‘av_close_input_stream’ to close the stream. ##if want to do time search,the procedure is as following: 1 call ‘av_seek_frame’ to seek by time or by byte. 2 call ‘av_read_frame’ to read packet and do demux and decode. #refer …
#2877 (Unable to rewind/seek a mp3) – FFmpeg
https://trac.ffmpeg.org/ticket/2877
av_seek_frame( container, audio_stream, 0, AVSEEK_FLAG_FRAME ); by avformat_seek_file( container, audio_stream, INT64_MIN, container->start_time, INT64_MAX, 0 ) No change. I can still see the bug. I ran ffprobe IN.mp3 -read_intervals "%2,0%2" -of compact -show_packets. Here is the output (truncated): [...]
audio: Seek issue with ffmpeg
https://audio32.blogspot.com/2014/12/seek-issue-with-ffmpeg.html
I implemented one audio player using with ffmpeg for playing all format audio files in android.I used following code for seek the song. int64_t seekTime = av_rescale_q(seekValue * AV_TIME_BASE, AV_TIME_BASE_Q, fmt_ctx->streams[seekStreamIndex]->time_base); int64_t seekStreamDuration = fmt_ctx->streams[seekStreamIndex]->duration;
mjbshaw: Seeking in FFmpeg: Know Your Timestamp!
http://www.mjbshaw.com/2012/04/seeking-in-ffmpeg-know-your-timestamp.html
Here's the catch: the documentation for av_seek_frame and avformat_seek_file both talk about being able to seek by a timestamp. This whole time, I thought FFmpeg was seeking by the PTS. As Reimar points out in the bug report, this is not the case. FFmpeg seeks by the DTS, not the PTS.* Why This is Important
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