17 mai

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 14:16
  Burning subtitles into video with ffmpeg with specific margin not working - Anthony Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to build a tool where people can position their subtitles on an HTML5 video and then I will burn the subtitles into the video for them. I can easily get the position of the subtitles, in whatever format I need, that's easy. However, no combination of values that I feed to ffmpeg are working. My holy grail is an x and y offest (aka offset 5% from the left, 10% from the bottom, in terms of video height/width). To achieve this, I would like the subtitles to start in the very bottom-left corner. ffmpeg -y -i english.mp4 -vf (...)
• 10:12
  FFMPEG - colorkey - Acnologla Newest 'ffmpeg' Questions - Stack Overflow
  i am using the following command to remove chroma key: ffmpeg -i black.png -i video.mp4 -filter_complex '[1:v]colorkey=0x70d021:0.35:0.15[ckout];[0:v][ckout]overlay[out]' -map '[out]' video-.mp4 but it results in these strange things around her original video Out video -- original video, Out video
• 10:00
  What are all of the file extensions supported by FFmpeg - zjevander Newest 'ffmpeg' Questions - Stack Overflow
  How would I go about getting a list of all the file extensions supported by FFmpeg for use in an ExtensionFilter used by FileChooser in JavaFX? I am familiar with the "-codecs" and "-formats" options from FFmpeg, but these list the format and codec names which do not necessarily coincide with their file extensions. e.g. (partial output from "ffmpeg -formats") D aac raw ADTS AAC (Advanced Audio Coding) DE ac3 raw AC-3 E matroska Matroska parsing aac and ac3 from the output of ffmpeg would work fine to create file extensions for those (...)
• 09:28
  Convert a bash script to Windows bat script [closed] - gyandoo Newest 'ffmpeg' Questions - Stack Overflow
  I have a bash script, now I need to convert it to bat. What the script does is based on the shortcut the script checks the audio codec and video codec using ffprobe and then loops through all the files in the folder to convert the file(s) using the presets based on which one the shortcut calls. It also limits the processor usage before running ffmpeg. Here's the script: #!/bin/sh FILES="/home/red/Downloads/to_convert/*" to_convert="/home/red/Downloads/to_convert" TYPE="$1" #echo "$TYPE" if [ -e '/tmp/convert.txt' ]; then echo (...)
• 03:46
  ffmpeg: Apply a time-based expr to control intensity of lowpass, highpass, aphaser, or aecho [closed] - Wes Modes Newest 'ffmpeg' Questions - Stack Overflow
  I am procedurally constructing complexFilters for ffmpeg via fluent-ffmpeg. My fluent-ffmpeg complex filters look like: "filter": "volume", "options": "volume": "min(1, max(0, ((cos(PI * t * 1 / 13) * 1 + cos(PI * t * 1 / 7) * 0.5 + cos(PI * t * 1 / 3) * 0.25) + -0.5 ) * 0.75 * -1 + 0.5))", "eval": "frame" , "inputs": "track_1_output", "outputs": "track_1_adjusted" , Note that I am using an expression to determine the volume dynamically. Here I'm testing on the command line, to understand the (...)

16 mai

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 05:54
  fluent-ffmpeg use without installation ffmpeg in Window [closed] - Vishal Kumar Newest 'ffmpeg' Questions - Stack Overflow
  can I use fluent-ffmpeg library without installation of FFMPEG in my window PC. I try to use fluent-ffmpeg library without installation of ffmpeg in my PC so i am not able to mux audio with video file . so it is compulsory to install ffmpeg first in local sysytem ?
• 22:13
  Making a video with opencv and ffmpeg. How to find the right color format? - luc Newest 'ffmpeg' Questions - Stack Overflow
  I have a webcam video recorder program built with python, opencv and ffmpeg It works ok except that the color of the video is more blue than the reality. The problem seems to come from color format of images. It seems that OpenCv is giving BGR images and ffmpeg+libx264 is expecting YUV420p. I've read that YUV420p correspond to YCbCr. opencv has no conversion from BGR to YCbCr. It only has a conversion to YCrCb. I have made some searchs and tried different alternatives to try converting opencv image to something that could be ok for (...)
• 20:42
  LL-HLS (CMAF/fMP4) minimize latency with FFplay - DanielB6 Newest 'ffmpeg' Questions - Stack Overflow
  How do I minimize latency when streaming LL-HLS (CMAF/fMP4) via FFplay? I configured a live video stream which is broadcast from a media server using LL-HLS. I see the following results: HLS.js: ~2 seconds behind the source FFplay (./ffplay "https:////playlist.m3u8"): ~8 seconds behind the source FFplay (./ffplay -fflags nobuffer -flags low_delay -strict experimental "https:////playlist.m3u8"): ~5 seconds behind the source My goal is to achieve what HLS.js can achieve in a browser, ~2 seconds behind the (...)
• 17:34
  Generating timestamps in webm transport stream with ffmpeg - Vlad Feinstein Newest 'ffmpeg' Questions - Stack Overflow
  I am recording screen capture of my Electron app to a file, as suggested here: Save captured video to file in Electron It works great, but the file is a “transport stream”. I can play it in Chrome browser, but can’t adjust the time slider. The suggestion was to use ffmpeg to post-process the file. The simplest, straight-forward command I found is: ffmpeg -fflags +genpts -i in.webm out.webm I thought that this simply generates timestamps. However, the out.webm file is 15 times smaller than in.webm! I don’t see any change in the quality. The downside is - the (...)
• 18:44
  How do I configure codec parameters for a RTSP stream? - Kermit Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to stream a network camera source into /dev/video0. However, all attempts keep telling me I have set incorrect codec parameters. Any suggestions? # works ffplay rtsp://admin:passwordⓐ172.16.0.184:554/live Then trying any of these to feed into /dev/video0 (valid from list of ls /dev/video*): ffmpeg -rtsp_transport tcp -i "rtsp://admin:passwordⓐ172.16.0.184:554/live" -c:v rawvideo -pix_fmt yuv420p -f v4l2 /dev/video0 Results in ffmpeg version 5.1.4-0+rpt3+deb12u1 Copyright (c) 2000-2023 the FFmpeg developers built with gcc 12 (...)
• 16:21
  C# server problem with FFmpeg Visual Studio 2022 - seanofdead Newest 'ffmpeg' Questions - Stack Overflow
  Hello everyone I've spent countless hours on my server I'm trying to create that will share video from one stream to another client computer. That is the goal anyway. I'm using Visual Studio 2022 most recent update. Currently this is my code using System; using System.IO; using System.Net; using System.Net.Sockets; using System.Threading.Tasks; using FFmpeg.AutoGen; using NLog; public class VideoStreamServer private const int Port = 5000; private TcpListener server; private FFmpegVideoEncoder encoder; private (...) --
• 14:02
  PHP/ffmpeg (Windows 7): - Permission Denied. Tried everything, but still doesn't work - user365465 Newest 'ffmpeg' Questions - Stack Overflow
  I have a command-line PHP script that, when given the folder name as an argument when executing the script, will find all images in said folder and resize them using FFmpeg. Problem is, I always get a Permission Denied error in FFmpeg when it attempts to get at the files within the folder. This is while being on Windows 7. The big problem is that I've tried every solution that keeps popping up on the interwebs when I search for how to fix it. I've changed the settings in Avast!, did the attrib command (both as normal and "Run as Administrator") to unmark as read-only, (...)
• 12:51
  How to stop ffmpeg remotely? - Adam Newest 'ffmpeg' Questions - Stack Overflow
  I'm running ffmpeg on another machine for screen capture. I'd like to be able to stop it recording remotely. FFMPEG requires that q is pressed to stop encoding as it has to do some finalization to finish the file cleanly. I know I could kill it with kill/killall however this can lead to corrupt videos. Press [q] to stop encoding I can't find anything on google specifically for this, but some there is suggestion that echoing into /proc//fd/0 will work. I've tried this but it does not stop ffmpeg. The q is however shown in the terminal (...)
• 10:24
  how to concat multiple files using ffmpeg - user3189881 Newest 'ffmpeg' Questions - Stack Overflow
  I want to concat multiple files using ffmpeg. I have few video files, few audio files, few images and few text files. I have to concat all the files one by one. Now, I am doing on video files like this: For the videos, first I converted both the video into same resolution using this: C:/FFmpeg/bin/ffmpeg -i E:/xampp/htdocs/ffmpeg_test/v1.mp4 -f lavfi -i anullsrc -vcodec copy -acodec aac -shortest video_with_silence.mp4 Then this command: C:/FFmpeg/bin/ffmpeg -i E:/xampp/htdocs/ffmpeg_test/output3.mp4 -i E:/xampp/htdocs/ffmpeg_test/output2.mp4 (...)
• 06:54
  ffmpeg Unrecognized option 'preset' [closed] - Lalaluye Newest 'ffmpeg' Questions - Stack Overflow
  Hello I just recently upgraded ffmpeg from 4.3.1 to 7.0 and getting the following error: my command is ffmpeg -y -f image2pipe -framerate 24 -i pipe: -c:v libx264 -preset veryfast -crf 29 -pix_fmt yuv420 and getting the below error: 16 May 2024 06:43:28,979 [DEBUG] testIntent (pool-7-thread-3) ffmpeg built with gcc 7 (GCC) 16 May 2024 06:43:28,979 [DEBUG] testIntent (pool-7-thread-3) configuration: --prefix=/local/p4clients/pkgbuild-JklBW/workspace/src/FFmpeg/build/private/install 16 May 2024 06:43:28,979 [DEBUG] testIntent (pool-7-thread-3) ffmpeg (...)
• 05:18
  Output file not specified - Rich Madrid Newest 'ffmpeg' Questions - Stack Overflow
  I have been messing around with ffmpeg working on basic mkv to mp4 conversions the last couple of days on my Mac and Windows computers. Mac was easier buy my windows desktop has a much faster OS so I wanted to do some conversions on it tonight. Got ffmpeg installed and working. After having some issues with the command prompt not finding the directory, I solved that with the following basic code to convert an mkv file to an mp4 for me: ffmpeg -i "C:\\Users\\Computer\\videos\\decade.mkv" "C:\\Users\\Computer\\Videos\\RJ videos\\Complete\\decade.mp4" I moved on to wanting to scale (...)
• 03:29
  How FPS reduction for H264 without transcode? [duplicate] - Александр А Newest 'ffmpeg' Questions - Stack Overflow
  There is a USB camera that sends H264 frames with a frequency of 30 fps in a resolution of 1920x1080, GOP size 30 or 60 (1 or 2 I frame per second depending on the camera and only P-frames), which requires throughput of about 6 mbit/s. It is necessary to reduce this to no more than 2 mbit/s. All this is done on a weak ARMv7, so the option of transcoding is extremely resource intensive, especially considering that I did not find how to do it as a GPU Mali (NanoPi Neo Core). Given that the basic functionality is performed on the framework ffmpeg, is it possible to reduce the frame (...)

15 mai

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 22:11
  avpriv_h264_has_reorder_num_frame error on av_send_packet - KaisoHHH Newest 'ffmpeg' Questions - Stack Overflow
  I'm facing the error in the title which crashes my thread. int decode(AVPacket* pPacket) int count = 0; int response = avcodec_send_packet(_pCodecContext, pPacket); while(response >= 0) AVFrame* pFrame = av_frame_alloc(); response = avcodec_receive_frame(_pCodecContext, pFrame); This is the general structure of where I'm decoding the video into frames. I do use seek_frame to change position around avstream to get different frames with this: avformat_seek_file(_pFormat, -1, INT64_MIN, location, INT64_MAX, (...)
• 21:22
  ffmpeg: PNGs to mp4 video is strange scaled quicktime - v_b Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to create a video from multiple PNG files. The files contain an animation of a line. However, the output MP4 video looks really strange, as if the content is stretched or scaled. Below, you can see screenshots of one of the PNG files and the resulting video file. Some additional information: I am on a MacPro M3 w. latest MacOs updates. The images have transparent backgrounds. Command: ffmpeg -framerate 30 -pattern_type glob -i "*.png" -s:v 1600x800 -pix_fmt yuv420p -c:v libx264 result.mp4 Example PNG file: PNG (...) -- , ,
• 20:06
  How do I make my discord.py bot play a sound effect? - Kronik71 Newest 'ffmpeg' Questions - Stack Overflow
  My bot is supposed to be some sort of jeopardy quiz show type of bot. /joinvc makes the bot connect to the call, however, I cant seem to make the bot make noise when its in a vc. Here's some of the code: ⓐinteractions.slash_command( name="press", description="Press the button" ) async def press(ctx: interactions.ComponentContext): await ctx.send(f"ctx.author.mention has pressed the button") vc = ctx.author.voice.channel player = vc.create_ffmpeg_player('audiopath', after=lambda: print('done')) player.start()  (...)
• 18:32
  Using FFMPEG: How to do a Scene Change Detection? with timecode? - Mozart Newest 'ffmpeg' Questions - Stack Overflow
  Based on this article it seems that it is possible to use FFMPEG to detect scene change in videos: http://www.luckydinosaur.com/u/ffmpeg-scene-change-detector Now I have a video that displays a book text and when the text (word or sentence) is spoken it gets highlighted. Something like this audio book: https://youtu.be/lA7L6ZNVKjc I need to know the timestamp when the text gets highlighted (hence scene change), this will allow me to add timestamp tags on my youtube video, so it becomes easier for listeners to navigate through the audiobook. What is (...)