Ffmpeg slow seek. Set custom interval .

• Ffmpeg slow seek 264 video in well under a second. exe -i video. mp4" -ss 4370. Therefore, for processing large amount of data, fspp is a good option (It gives good results if parameters are chosen wisely). mp4 -c:v libx264 -preset ultrafast -tune zerolatency -c:a aac -hls_time 1 -hls_playlist_type event -hls_flags single_file output. Be aware that in a codec which isn't "I Frame only," you may get garbage for the first few frames after a seek until ffmpeg gets enough information to give you a full frame. I could successfully get the clip without the black frames with the slow seek, but it takes over 4 minutes just for seeking. Seeking forward with the right arrow key causes mpv to exit immediately, even if there is plenty of the video left. Some options can be changed during the operation of the filter using a command. I am trying to seek to different positions on a video file encoded in H264 (or MPEG-4 AVC (part10)) using VideoCapture and the time taken to seek to the position seems to be proportional to the frame number queried. With fast seek, Try re-package it by using: ffmpeg -i <<INPUT>> -c copy <<OUTPUT. ffmpeg -discard nokey -i input. txt FFmpeg is a powerful and versatile library for multimedia processing, capable of handling various audio, video, and container formats. FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. ͏ The input will Using -ss after the -i is going to need to decode that amount before it gets to where you want to start processing from. seems ffmpeg caching make future seeks fast. This was referenced Dec 2, 2023. When transcoding and -accurate_seek is enabled (the default), this extra segment between the seek point and position will be decoded and discarded. ffmpeg should report back if any issue arise or data is damaged on the file. How can I keep the fast seek that I normally get with QuickTime? My hardware: Macbook Pro 16 - i9 9880H 2. mp4: Specifies the input file. . Since I can't upgrade at the moment, I'm looking to optimize what I have. The doc says : "ffmpeg will seek to the I found that using the "HLS protocol" instead of the "HLS demuxer" worked better for seeking. Call of av_seek_frame() in my code using FFmpeg LibAV takes about 3-10 seconds to jump to a middle position in 1-2 hours video. mp4 with the name of your video file. webm -q:a 0 -map a -t hh:mm:ss -y out. 在执行跳转之前使用AV_TIME_BASE进行一个时间戳的转换。 在代码中使用到了 boost::program_options 对命令行参数进行操作，如果要编译成功需要使用boost::program_options,如果不想使用可以直接将那部分代码删除，然后编译连接的时候要链接到ffmpeg lib即可。 FFmpeg includes the following post-processing filters: spp - Simple Postprocessing uspp - Ultra Simple or Slow Also, uspp is very slow as compared to other filters. When clicking on the OSD, seeking is slow, taking longer to seek the longer into the video you try to seek. ts I use -c:v h264 because the pad filter changes the h264 video codec to mpeg2video, which greatly reduces the video quality. mkv -shortest -c:v libvpx-vp9 -pass 2 -b Seek to pos. How to reproduce. Closed mifi mentioned this issue Jan 31, 2024. Keyframe cut mode bug? #1795. Set the speed of this 4s clip to 32x. c files. mkv To slow down your video, you have to use a multiplier greater than 1: ffmpeg -i input. 534 1 1 gold FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. How to fix it? ffmpeg; Share. 95 -c:a copy -c:v hevc_nvenc -rc vbr_hq -cq 19 -b:v 10000k -maxrate:v 12500k "C:\Users\user\Videos\obs\____delete1. fps video filter. 0 means lossless. If there is a time delay then this is the likely cause. mkv -r 16 -filter:v "setpts=0. You should try this. In this case, you want to have a live stream with more/less constant bit rate (using the option -b:v), to be able to control the bandwidth used. Cuts from 00:01:00 to 00:02:00, using the faster seek. After some initial flawed designs, the new, better design sent me down a rabbit hole debugging ffmpeg, x264 and libtheora until finally coming to the point where I can generate and evaluate all the This slows down one part of a video and keeps the rest as is. But the forward or rewind are seem to be disabled. In the lavf API this process is represented by the avformat_open_input() function for opening a file, av_read_frame() for reading a single packet and finally avformat_close_input(), It tells FFmpeg seek to the specified time before start decoding. com> wrote: > Hello > > I've been tasked with making a Python-based, cross-platform application > that centres around (but which is not limited to) a central video player > window. The -g option can be used to set the maximum keyframe interval. FFmpeg is a robust and actively developed cross-platform command-line utility that can process audio and video files. 09 seconds — that’s an improvement of 34% from the slow, naive 1 Synopsis. mp3 But you'll have to specify a duration instead of to with most formats. Top. flv I recieve the resultant file. I'm trying to convert a scene from a soft-subbed MKV file into a hard-subbed WEBM file with two-pass. 3600 frame in 32 seconds. ffmpeg -y -i "C:\Users\user\Videos\obs\part1. I get slow seek when I transcode to x264 or x265. if I want frame 150 and my video is 29. mkv Smooth. The latter takes considerably longer to seek than the former after stopping the video and restarting (around the 2 hr mark). Viewed 1k times 2 . Figure 3: Utilizing threading with cv2. This can be slow. 1, the main advantage is that when applying filters to the output stream, the timestamps aren't reset prior to filtering (i. 3GHz 8 core The purpose of the single-file m3u8 is to be able to jump to an approximate location fast, then slow seek accurately from there. Special characters must be escaped with backslash or single quotes. I don't know what videos you have available. The format is HH:MM:SS. For example it can be used to check the format of the container used by a multimedia stream and the format and type of each media stream contained in it. ts My problems; hoping that you have any workarounds to solve them: 1- As you can see the wanted output's duration is 5 seconds which I didn't get at all. I use PHP but I am aware that a C method exists by using av_seek_frame, I barely know C so I'm unable to implement this into a PHP This will be done relatively slow, frame-by-frame. VideoCapture, so it could help to ask again with a Yes, it is possible to achieve low-latency HTTP Live Streaming (LL-HLS) using FFmpeg. pos must be a time duration specification, see (ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual. 97 and 30fps (so they're in super slow motion). You Even for pretty slow computers, you should be able to seek anywhere within a low-resolution H. 98 bitrate=4346. Lex Lex. In this article, we will explore how to harness the power of FFmpeg in your C++ projects, discussing the necessary steps for integrating the library, and providing example code to help you get started. Stack Exchange Network. mp4 -ss 00:00:15 -t 00:00:10 -async -1 clip. mkv -filter:v "setpts=2. order=ffmpeg,copy copy-ext=. However VLC seeks very fast in same MVK avformat_seek_file() 函数默认是把文件的读取位置，设置到离 ts 参数最近的关键帧的地方。 而且默认情况，是容器里面所有流的读取位置都会被设置，包括 音频流，视频流，字幕流。 只要流的 discard 属性小于 AVDISCARD_ALL 就会被设置。. I am also uploading to the ftp site the full video file of the slow seeking Half-Blood Prince under my user name. 0. ffmpeg -ss 5000ms -i input. /ffmpeg -i input -vf "select=gt(scene\,0. Note that Seek to the end of the first clip. If video codec is not set to copy. The upper (lower) bound of the output interval is rounded up (down) such that the output interval always falls within the intput interval. 0, and always return 0 which means success. mov -vf "setpts=(PTS-STARTPTS)/10" -crf 18 output. When i seek, the CPU useage jumps up and it takes up to minutes until the seeking process finishes. 0 Lsize=N/A time=00:57:28. To use the "HLS protocol" prefix the HLS playlist url with hls+https:// instead of just https:// (which uses the HLS demuxer apparently), and doing that got the seek working for me. 2 相关函数说明 AVPacket *av_packet_alloc(void) // AVPacket空间的创建和初始化。 I would to do a live streaming with ffmpeg from my webcam. so it's searching the video file for that 1. mp4 Slow Output Seeking: The -ss parameter needs to be specified after -i. ) The suggestions to When used as an input option, ffmpeg will directly seek the video file to that position. You can use -ss + -to/-t input options to quickly In order to achieve frame-accurate fast-ish seek, ffmpeg fast-seeks to the requested position or before it. However, no matter what I do, I cannot seek/scrub/fast forward the resulting file, and I have no idea why. Oh sure, I can move the cursor ahead in Finder's "Quick Look," VLC, Have you tried moving the flush after the seek (not sure if that will make a difference). Tutorial 07: Seeking Code: tutorial07. Set the speed to 8x. 48 -to 4384. Only when playing some H264 encoded video, uwp mediaplayer will automatically use key frame seek. Download in other formats: Plain Text; Powered by Trac 1. mp4 -c copy -f mpegts - | ffmpeg -f mpegts -i - -c copy newinput. If you need to play back a video at rates above 2. ffmpeg -i input. This command works and runs perfectly, but it is dirt slow. h264 All of the commands below are equivalent in the amount of video to seek in comparison to previous commands. – Christopher Jarvis. Sometimes seeking code I'm trying to do some screencasting, but since my computer is much too old and slow the video being produced is laggy and the application I'm trying to record becomes unresponsive due to the CPU consumption. Seek back 4 seconds, and split. Why was it really fast to select a thumbnail the first time, and painfully slow the next time? time ffmpeg -ss 1800 -i https://embed-ssl. This will be done very slowly, frame by frame. png This example will seek to the position of 0h:0m:14sec:435msec and output one frame (-frames:v 1) from that position into a PNG file. The output duration of the video will stay the same. I guess that -ss lets ffmpeg seek from the beginning of the original file to the start time as I can observe disk action when seeking. This will tell FFmpeg to seek the 5th second of your video. To use Ffmpeg to slow down an audio file, use the atempo filter. Previous message: [FFmpeg-user] Reducing seek time when start time offset (-ss) is large Next message: [FFmpeg-user] Reducing seek time when start time offset -ss after -i uses skipping and is very slow, you want a new option that does most of the work by seeking and then skips from the last keyframe until the target time. This page is about the library libav, which is a part of FFmpeg. mp4 -threads 0 -i damage_file. How to reproduce: C:\ffmpeg>ffmpeg -ss 00:30:00 -i f. log Detailed Description. 264 video works very slow. VideoCapture and OpenCV leads to higher FPS and a larger throughput rate. ts you may observe slow-motion-like effect (FFplay) or slight offsync (MPlayer), but those will stabilize in a few seconds. mp4 -filter:v "setpts=0. However, FFMPEG seems terribly slow. 264 encoder), while retaining the same visual quality. These commands adjust the video speed by manipulating the presentation timestamps (PTS). mpeg, split2. Ffmpeg. png, out2. So, I tried recoding the original into a new, trimmed clip: ffmpeg -i test. mp4 -vf "setpts=2*PTS" slow. Though it may, if applicable: auto-adjust the stream's start time to negative to compensate. To slow down a video by a factor (e. ffmpeg, how to cut to exactly at the start and end time? FFmpeg : Slow seeking on compression process. pstjwda ffybf eporx lollfbx bukdh pcvil hgyeq dqhwc utdrzej zubmptfr zwyg ssqsa gge dygvb lda