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Unpacking (8): AV_ seek_ Frame change playback progress ...
https://chowdera.com/2022/02/202202031624086339.html
Unpacking (8): AV_ seek_ Frame change playback progress function. Seek to the keyframe at timestamp. ‘timestamp’ in ‘stream_index’. from AV_TIME_BASE units to the stream specific time_base. or, if no stream is specified, in AV_TIME_BASE units. analysis : The first parameter of the above function is the context of our encapsulation ...
media player - ffmpeg av_seek_frame with …
https://stackoverflow.com/questions/20734814/ffmpeg-av-seek-frame-with-avseek-flag-any-causes-grey-screen
Problem: omxplayer's source code calls the ffmpeg av_seek_frame() method using the AVSEEK_FLAG_BACKWARD flag. Although not 100% sure, I believe this seeks to the closest i-frame. Instead, I want to seek to exact locations, so I modified the source code such that the av_seek_frame() method now uses the AVSEEK_FLAG_ANY flag. Now, when the movie loads, I …
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的调用_xiaojun11的专栏-CSDN博客_av_seek_frame
https://blog.csdn.net/xiaojun111111/article/details/52846165
static int seek_to_start(InputFile *ifile, AVFormatContext *is) { InputStream *ist; AVCodecContext *avctx; int i, ret, has_audio = 0; int64_t duration = 0; ret = av_seek_frame(is, -1, is->start_time, 0); <span style="font-family: Arial, Helvetica, sans-serif;">//=====***** </span> if (ret < 0) return ret; for (i = 0; i < ifile->nb_streams; i++) { ist = input_streams[ifile->ist_index + i]; avctx = …
[Libav-user] Why does av_seek_frame() not seek to a keyframe?
https://libav-user.ffmpeg.narkive.com/wKMPnyG1/why-does-av-seek-frame-not-seek-to-a-keyframe
Seeking command: av_seek_frame (formatContext, -1, targetTimestamp , AVSEEK_FLAG_BACKWARD); (returns as successful; and yes, I'm flushing. my codec's buffers before seeking) The first packet retrieved after the seek belongs to the video stream, and has the following info: packet.pts == 7894091248.
ffmpeg中av_seek_frame使用样例_吐着泡泡说爱你的博客-CSDN博 …
https://blog.csdn.net/xujaiwei/article/details/77651562
av_seek_frame使用时需要使用四个参数 av_seek_frame(fmt_ctx, -1 , 20 * AV_TIME_BASE, AVSEEK_FLAG_ANY);参数一: fmt_ctx为容器内容; 参数二: 流索引, stream_index 参数三: 将要定位处的时间戳 参数四: seek功能flag容器即AVFormatContext, 其中包含了一些视频标准 …
About av_seek_frame() · Issue #151 · microsoft ...
https://github.com/Microsoft/FFmpegInterop/issues/151
I tried to make this change in my local project. And the performance of seeking is better than the old one. In FFmpeg document, it looks like the AVSEEK_FLAG cannot be 0.
audio: Seek issue with ffmpeg
https://audio32.blogspot.com/2014/12/seek-issue-with-ffmpeg.html
ret = av_seek_frame(fmt_ctx, seekStreamIndex, seekTime, flags); avcodec_flush_buffers(dec_ctx); Its working fine for most of the songs.But some of the mp3 songs getting duration problem.For example if the song length is 2 mins if i seek the song to some position then finally song ends with 2 mins 10 seconds.I get this issue with only mp3 songs.Without seeking the same song …
Seeking in FFmpeg: Know Your Timestamp! - mjbshaw
http://www.mjbshaw.com/2012/04/seeking-in-ffmpeg-know-your-timestamp.html
When seeking (audio), use the DTS/PTS for the first frame, because that's all you have. But as you start decoding and playing, use the sample count as your timestamp and don't keep using the DTS/PTS. In the end, seeking was my …
FFmpeg: Demuxing
https://www.ffmpeg.org/doxygen/trunk/group__lavf__decoding.html
If the audio frames have a variable size (e.g. MPEG audio), then it contains one frame. pkt->pts, pkt->dts and pkt->duration are always set to correct values in AVStream.time_base units (and guessed if the format cannot provide them). pkt->pts can be AV_NOPTS_VALUE if the video format has B-frames, so it is better to rely on pkt->dts if you do …
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