26 juin

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

• 23:37
  FFMPEG MKV -> MP4 Batch Conversion - blaziken386 Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to write a program that lets me convert a series of .mkv files with subtitle files into .mp4 files with the subs hardcoded. Right now, the script I use is ffmpeg -i input.mkv -vf subtitles=input.mkv output.mp4 This is fine, but it means I can only convert them one at a time, and it's kind of a hassle because it means I have to fiddle with it every few minutes to set up the next one. I have another script I use for converting .flac files to .mp3 files, which is ⓐECHO OFF FOR %%f IN (*.flac) DO ( echo Converting: (...)
• 14:36
  Get audio amplitude list using FFmpeg, which contains n (could be set manually) items [closed] - Xavier Hugo Newest 'ffmpeg' Questions - Stack Overflow
  I am working on a recorder app and need to generate audio spectrum for my files. I need to get amplitude list from audio file so that I can draw audio wave with Canvas by my own. I have read the fantastic answer by llogan. However, I don't know how to set the time interval manually. By the way, when I try to run the command, I got a list full of negetive numbers: command-running-image. Hope someone can explain it. -- command-running-image
• 17:46
  Detect if "faststart" has been applied to video - Will Ashworth Newest 'ffmpeg' Questions - Stack Overflow
  When running "qt-faststart" on an MP4, you're essentially taking the meta data from the back and placing it at the front of the file. In my case, so Flash can properly start playing the video before it's fully done loading. I have a large number of videos that I'm running through a shell script to encode overnight. When I upload, however, I won't necessarily know in my final folder of videos (on the server) have "qt-faststart" run on it. My goal is to find the straggler videos and run qt-faststart on them manually, but I'll need a way to (...)
• 13:01
  While using skvideo.io.FFmpegReader and skvideo.io.FFmpegWriter for video throughput the input video and output video length differ - Kaesebrotus Anonymous Newest 'ffmpeg' Questions - Stack Overflow
  I have a h264 encoded mp4 video of about 27.5 minutes length and I am trying to create a copy of the video which excludes the first 5 frames. I am using scikit-video and ffmpeg in python for this purpose. I do not have a GPU, so I am using libx264 codec for the output video. It generally works and the output video excludes the first 5 frames. Somehow, the output video results in a length of about 22 minutes. When visually checking the videos, the shorter video does seem slightly faster and I can identify the same frames at different timestamps. In windows explorer, when clicking (...)
• 08:19
  Efficiently Merging Multiple Videos in iOS: Alternatives to AVFoundation - Levan Karanadze Newest 'ffmpeg' Questions - Stack Overflow
  What is the most efficient way to merge two or more videos into a single video in an iOS application? I've tried using AVFoundation, but it's quite slow. I have tried different presets (even AVAssetExportPreset1280x720) and the process is still very slow. Are there any GPU-accelerated frameworks or techniques that can improve the performance? Here is my current implementation. func mergeVideos( _ items: [VideoItem], presetName: String, overlay: Overlay?, completionHandler: ⓐescaping (Result) -> Void ) let fileName = (...)
• 05:40
  Cross compiling Rust app depending on ffmpeg fails - user253530 Newest 'ffmpeg' Questions - Stack Overflow
  Trying to cross compile an application depending on ffmpeg-next from Linux to Windows. It works well on Linux but when using cross to compile for Windows I get this error error: failed to run custom build command for `ffmpeg-sys-next v7.0.0` Caused by: process didn't exit successfully: `/target/debug/build/ffmpeg-sys-next-a15fd7744c0ae4bc/build-script-build` (exit status: 101) --- stdout cargo:rerun-if-env-changed=LIBAVUTIL_NO_PKG_CONFIG cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_x86_64-pc-windows-gnu cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROS

25 juin

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

• 20:17
  FFmpegInteropX in Unity Hololens 2 - CocoaMilka Newest 'ffmpeg' Questions - Stack Overflow
  I'm building a UDP video stream decoder for the Hololens 2 in Unity 2021. I've compiled FFmpegInteropX for ARM64 UWP, however I'm having issues setting it up within Unity. With the binaries included in /Plugins/WSA I get the following error: ArgumentException: The Assembly WinRT.Runtime is referenced by FFmpegInteropX.DotNet ('Assets/Plugins/WSA/FFmpegInteropX.DotNet/Release/FFmpegInteropX.DotNet.dll'). But the dll is not allowed to be included or could not be found. I've wrapped all of my WinRT dependent code with the appropriate preprocessor (...) -- FFmpegInteropX
• 18:04
  How to resolve "ffmpeg was killed with signal SIGSEGV" in docker container - Gmanicus Newest 'ffmpeg' Questions - Stack Overflow
  I have a Node.js application deployed to a docker container with fluent-ffmpeg, ⓐffmpeg-installer/ffmpeg, and ⓐffprobe-installer/ffmprobe. Here is the fluent-ffmpeg init script: import ffmpeg = require('fluent-ffmpeg'); const ffmpegPath = require('ⓐffmpeg-installer/ffmpeg').path; const ffprobePath = require('ⓐffprobe-installer/ffprobe').path; ffmpeg.setFfmpegPath(ffmpegPath); ffmpeg.setFfprobePath(ffprobePath); export default ffmpeg; This gets used to take a snapshot of a video and save that image to (...)
• 19:30
  ffmpeg: libavfilter API av_buffersink_get_frame returns alway EAGAIN - aculnaig Newest 'ffmpeg' Questions - Stack Overflow
  I want to resize an image with libavfilter C API through zscale filter and libplacebo filter but no matter how I call av_buffersink_get_frame, it always returns EAGAIN and no data is filled in the filtered_frame. #include #include #include #include #include #include #include #include #include #include #include #include int main(int argc, char **argv) if (argc != 4) fprintf(stderr, "usage: %s \\n", argv[0]); exit(EXIT_FAILURE); const char *filename = argv[1]; const size_t (...)
• 13:07
  Can MinGW's static library be linked to MSVC - ValueError Newest 'ffmpeg' Questions - Stack Overflow
  I use mingw-w64 on linux to cross compile the ffmpeg static library for windows with the following command: ./configure --arch=x86 --disable-doc --disable-ffplay --disable-ffprobe --disable-ffmpeg --prefix=/mnt/c/ffmpeg --enable-gpl --enable-nonfree --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --pkg-config=pkg-config --disable-shared --enable-static make -j16 make install Then I got some .a files instead of .lib files. Can I directly link these files to MSVC? If not, what should I do (...)
• 07:22
  FFMPEG node.js using with ytdl - zlElo Newest 'ffmpeg' Questions - Stack Overflow
  I have nodejs javascript code and I want that the video and the audio is downloaded, to combine it with ffmpeg. First, the video is longer that it should be, idk why. Second, the ffmpeg is not working because I'm getting an error, that ffmpeg can't find (but I installed fluent-ffmpeg via npm correctly) My code: const fs = require('fs'); const ytdl = require('ytdl-core'); const ffmpeg = require('fluent-ffmpeg'); // Function to download the youtube video function download() const linkInput = (...)
• 04:46
  ffmpeg library resizing and uploading output file in the folder on localh but on server file doesn't upload after resizing - user24973246 Newest 'ffmpeg' Questions - Stack Overflow
  Here is my function: try if (!empty($_FILES['file2'])) $files = true; // Handle the file uploads $files2 = $_FILES['file2']; $maxFileSize = 500 * 1024 * 1024; // 500 MB in bytes foreach ($files2['name'] as $key2 => $value2) if ($files2['error'][$key2] == UPLOAD_ERR_OK) if ($files2['size'][$key2] <= $maxFileSize) $job_file = $files2['name'][$key2]; $inputFile = $files2['tmp_name'][$key2]; $file_name = pathinfo($job_file, PATHINFO_FILENAME);  (...)
• 01:29
  Remove a section from the middle of a video without concat - minseong Newest 'ffmpeg' Questions - Stack Overflow
  How do I cut a section out of a video with ffmpeg? Imagine I have a 60 second mp4 A. I want to remove all the stuff from 0:15 to 0:45. The result should be a 30-second mp4, which is composed of the first 15 seconds of A directly followed by the last 15 seconds of A. How can I do this without using concat? I know how I could do it by creating two intermediary files and then using ffmpeg to concat them. I don't want to have to perform so much manual work for this (simple?) operation. I have also seen the trim filder used for removing multiple parts from a (...)

24 juin

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

• 22:55
  Using FFmpeg in .net? - daniel Newest 'ffmpeg' Questions - Stack Overflow
  So I know its a fairly big challenge but I want to write a basic movie player/converter in c# using the FFmpeg library. However, the first obstacle I need to overcome is wrapping the FFmpeg library in c#. I've downloaded ffmpeg but couldn't compile it on Windows, so I downloaded a precompiled version for me. Ok awesome. Then I started looking for C# wrappers. I have looked around and have found a few wrappers such as SharpFFmpeg (http://sourceforge.net/projects/sharpffmpeg/) and ffmpeg-sharp (http://code.google.com/p/ffmpeg-sharp/). First of all, I wanted to use (...) -- http://sourceforge.net/projects/sharpffmpeg/, http://code.google.com/p/ffmpeg-sharp/
• 19:58
  How does sunshine capture and stream the desktop - user16235056 Newest 'ffmpeg' Questions - Stack Overflow
  I am looking to understand the Sunshine project by Loki which works with moonlight to stream a desktop with very low latency based on Nvidia's GameStream. I looked at the source code on GitHub, but couldn't figure out how the screen is captured and the stream is converted to an RTSP packet. I think they use ffmpeg to capture the screen. I did find the RTSP packet definition here Could someone explain how this works? I am trying to understand this on a low level, since I want to implement a similar program as part of a project later(probably in (...) -- Sunshine project by Loki, moonlight, here
• 20:07
  Uploading Reel to Instagram via API error: The video format is not supported - Ben Fox Newest 'ffmpeg' Questions - Stack Overflow
  I'm using FFMPeg to create a video with backing audio to upload to Instagram via the Graph API. I've followed the specs here as closely as I can: https://www.facebook.com/business/help/1197310377458196?id=376980407544978 and I've used ffprobe and MediaInfo to try and debug differences between my generated file and the requirements from Meta but every time, I get "Video process failed with error: Unsupported format: The video format is not supported. Please check spec for supported duration format". I've tried doing binary uploads and supplying a URL via their (...) -- https://www.facebook.com/business/help/1197310377458196?id=376980407544978, ,
• 18:56
  Laravel unable to load FFProbe? - marked-down Newest 'ffmpeg' Questions - Stack Overflow
  I'm using the PHP-FFMpeg repository to do some video work inside my Laravel application, but I'm encountering some issues setting it up. Once I've installed the PHP-FFMpeg repo, I try and create an FFMpeg instance: $ffmpeg = \\FFMpeg\\FFMpeg::create(); However, this does not work. In response, I get an ErrorException that simply states: Unable to load FFProbe This does not make sense to me, as when I run ffmpeg and ffprobe from my Mac's terminal, I can see they are installed. This is clearly a path/resolving issue, but (...)
• 18:34
  Convert ogg audio to wav in python without ffmpeg - Talha Anwar Newest 'ffmpeg' Questions - Stack Overflow
  I am getting oga file from javascript blob and I want to convert it to PCM compatible wav file in python. The approach I am using is as follow AudioSegment.converter = r"C:/ffmpeg/bin/ffmpeg.exe" AudioSegment.ffprobe = r"C:/ffmpeg/bin/ffprobe.exe" sound = AudioSegment.from_file("file.oga") sound.export("file.wav", format="wav") For this I have to download ffmpeg locally. Is there any way to convert oga file to wave directly. This is how i am saving file f = open('./file.oga', (...)
• 15:36
  How to send AVPacket through a QTcpSocket.write() with all of its data? - CottonBuds Newest 'ffmpeg' Questions - Stack Overflow
  I want to send an AVPacket though a QTcpSocket.write() I tried to cast the avpacket pointer to an char * but it only shows 8 bytes of the avpacket and without the avpacket.data. here is my code void DisplayStreamServer::sendDataToClient(AVPacket* packet) if (client == nullptr) return; client->write((char*) packet); client->waitForBytesWritten(); av_packet_unref(packet); av_packet_free(&packet); I can see that my packet.data has data inside it using the visual studio memory viewer. but it seems like when (...) -- ,
• 11:06
  Streaming raw h264 video from Raspberry PI to server for capture and viewing [closed] - tbullers Newest 'ffmpeg' Questions - Stack Overflow
  This is really an optimization question - I have been able to stream h264 from a raspberry pi 5 to a linux system and capture the streams and save them to .mp4 files. But I intend to run the video capture and sending on a battery powered Pi Zero 2 W and want to use the least amount of power to maximize battery life and still providing good video quality. I've explored many different configuration settings but am getting lost in all the options. This is what I run on the pi: rpicam-vid -t 30s --framerate 30 --hdr --inline --listen -o tcp://0.0.0.0:5000 I (...)
• 12:08
  AVPacket->Data is empty "0/0" but has size - CottonBuds Newest 'ffmpeg' Questions - Stack Overflow
  I am using libAV* to encode frames(unsigned char*) from my streaming application. I encoded my initialized frames but when I tried to get the avpacket. it returns an avpacket with a size but without data inside it "0/0" here is my code StreamCodec.h class StreamCodec : public QObject Q_OBJECT public: StreamCodec(int height, int width, int fps); public slots: void encodeFrame(std::shared_ptr pData); void run(); signals: void encodeFinish(AVPacket* packet); private: void initializeSWS(); void (...) -- ,
• 12:04
  "Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning - goldie Newest 'ffmpeg' Questions - Stack Overflow
  For a captcha solver I need to use FFmpeg on Windows 10. Warning when running the code for the first time: C:\\Users\\user\\AppData\\Roaming\\Python\\Python310\\site-packages\\pydub\\utils.py:170: RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning) Running the script anyway while it required ffprobe I got: C:\\Users\\user\\AppData\\Roaming\\Python\\Python310\\site-packages\\pydub\\utils.py:198: RuntimeWarning: Couldn't find ffprobe or (...)
• 10:51
  Android ffmpeg white space in input path causing "no such file or directory" - Mehran Newest 'ffmpeg' Questions - Stack Overflow
  I'm using the latest version of WritingMinds/ffmpeg-android-java library. I've tried single/double quoting the path with no success. I Logged my command after execution, please look to the input path where a subDirectory contains whiteSpace, a comma has been added between the space: ffmpeg, -i, "storage/emulated/0/Telegram/Telegram, Video/4_5828137322067002802.mp4", -vf... I split and run my command like this: String crop = "-ss " + skipTimeForCrop + " -noautorotate -i " + newPath + " -vframes 10 -vf (...) -- WritingMinds/ffmpeg-android-java
• 09:19
  I can't compile Whisper Ai into EXE file with Pyinstaller - das saew Newest 'ffmpeg' Questions - Stack Overflow
  i'm not sure if its a ffmpeg issue or a whisper ai issue but after compiling my .py file with pyinstaller into one exe file using this command pyinstaller --onefile --add-binary="ffmpeg.exe;." --recursive-copy-metadata "openai-whisper" 123.py this is what i get as an error when i run the exe file that comes out enter image description here can someone help me figure out what's missing? -- enter image description here
• 09:02
  avdevice_capabilities_create This function is deprecated, what should I replace it? - 中野梓喵 Newest 'ffmpeg' Questions - Stack Overflow
  I wanted to get the support information about the device as a string, but this function was completely abolished in ffmpeg 6 int avdevice_capabilities_create (AVDeviceCapabilitiesQuery **caps, AVFormatContext *s, AVDictionary **device_options) void avdevice_capabilities_free (AVDeviceCapabilitiesQuery **caps, AVFormatContext *s) Alternative solutions
• 01:49
  ffmpeg command to convert 720p to 1080p, 1440p, 2160p compatible with YouTube [closed] - Tendekai Muchenje Newest 'ffmpeg' Questions - Stack Overflow
  I have a video that I created in Final Cut Pro. When i uploaded it to Youtube, it only maxes out at 720p. I would like it to have higher options like 1080, 1440 and 2160 even if the quality does not change. Maybe 2160 is impossible, but 1440p would be nice. I have tried this command, but the resulting file is unplayable, it only plays audio. ffmpeg -i Hey\\ Girl.mov -vf scale=3840x2160:flags=lanczos -c:v libx264 -crf 13 -c:a aac -b:a 512k -preset slow hey_girl_hd.mov I am looking for a command that would make at least 1080 and 1440 work on YouTube. If 2160 can work, that (...)
• 06:47
  Nginx RTMP module not creating .m3u8 in correct format - Moiz Hassan Newest 'ffmpeg' Questions - Stack Overflow
  I am creating a rtmp server using nginx-rtmp-module inside a docker container. Using OBS I can connect with the server to start a live stream. M3U8 and .ts files are being created successfully but the .m3u8 file isn't in format I want. The generated .m3u8 file is like: #EXTM3U #EXT-X-VERSION:3 #EXT-X-MEDIA-SEQUENCE:5 #EXT-X-TARGETDURATION:10 but I want to generate .m3u8 file so it is simialr to this: #EXTM3U #EXT-X-VERSION:3 #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:0 #EXT-X-PLAYLIST-TYPE:VOD #EXTINF:10.000000, 0.ts #EXTINF:10
• 00:02
  Cross compile ffmpeg output .a files - ValueError Newest 'ffmpeg' Questions - Stack Overflow
  I use mingw-w64 on linux to cross compile the ffmpeg static library for windows with the following command: ./configure --arch=x86 --disable-doc --disable-ffplay --disable-ffprobe --disable-ffmpeg --prefix=/mnt/c/ffmpeg --enable-gpl --enable-nonfree --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --pkg-config=pkg-config --disable-shared --enable-static make -j16 make install Then I got some .a files instead of .lib files. Can I directly link these files to MSVC? If not, what should I do (...)

23 juin

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

• 19:58
  Not able to display first frame of mp4 file - Jatin Parmar Newest 'ffmpeg' Questions - Stack Overflow
  I am learning OpenCV from YouTube, and I just created a very basic program in Python. import cv2 as cv sources = cv.VideoCapture("test.mp4"); if not sources.isOpened(): print("Failed to open video file"); else: print("video file opened successfully"); win_name = "test" cv.namedWindow(win_name) (has_input, frame) = sources.read() if has_input: cv.imshow(win_name, frame[...,::-1]) cv.waitKey(0) sources.release() But when I run the program, I have the following errors: I have tried Googling it, but I (...) -- https://drive.google.com/file/d/1TgY5O6pFLU3eEGsvmU0LoAw6_I8kGM6s/view?usp=sharing
• 19:54
  Which library lets me manipulate Audio Objetc's metadata right before decoding? - BunnyMerz Newest 'ffmpeg' Questions - Stack Overflow
  I have read that in the MPEG-H part 3, the 3D audio one, you have the option to encode Objects with certain meta-data, such as volume and coordinates. And it is defined by the Standard that you can alter those information as it goes trough the decoder. Here is an image taken from and article. I'm referring to the box called Meta-data Decoder I am struggling to find a library that gives me that option, programmatically. I have looked into libmpegh and ffmpeg (which is also tagged in this question). Are there any known Libs that will let me alter the metadata as the audio is (...) -- , libmpegh, ffmpeg
• 18:12
  How to remove ID3 audio tag image (or metadata) from mp3 with ffmpeg - Buzut Newest 'ffmpeg' Questions - Stack Overflow
  FFMPEG is really a great tool. I know it can edit ID3 tags and even remove all tags in a row : ffmpeg -i tagged.mp3 -map_metadata -1 untagged.mp3 But even after that, there's still the cover image. I don't know how to remove it using ffmpeg. I know there's other soft out there that can do the job - like eyed3 - but what's the point to install it if ffmpeg can do it too, in one line, while encoding the audio (...)
• 16:51
  FFMPEG eating up ram in railway deployment [flask app] - Eshan Das Newest 'ffmpeg' Questions - Stack Overflow
  I created a flask app , meme generator, hosting it in railway using gunicorn, i am suspecting ffmpeg is eating the most ram..... so what i am doing is , generating a tts, and a text adding into one of the parts of the video , and then finally combining all together from flask import Flask, request, jsonify, send_file, url_for from moviepy.editor import VideoFileClip, ImageClip, CompositeVideoClip, AudioFileClip, concatenate_videoclips from pydub import AudioSegment from PIL import Image, ImageDraw, ImageFont from gtts import gTTS from flask_cors import (...)
• 16:46
  How to manipulate Objetc's metadata right before decoding? - BunnyMerz Newest 'ffmpeg' Questions - Stack Overflow
  I have read that in the MPEG-H part 3, the 3D audio one, you have the option to encode Objects with certain meta-data, such as volume and coordinates. I want to build a demo, in which you can change the volume and other meta-data information while the video/audio is being played/decoded, but I am struggling to find a library that gives me that option. I have looked into libmpegh and ffmpeg (which is also tagged in this question). For the libmpegh, I have read the docs and read some of their implementation for their main function that gets called by their command line integration. It (...) -- libmpegh, ffmpeg,

22 juin

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

• 23:25
  How to extract audio from a video in Flutter? - Mohammed Bekele Newest 'ffmpeg' Questions - Stack Overflow
  I have an image picker in Flutter to get the video from the device, and then I created a function to extract the audio using ffmpeg_kit_flutter package. Future _convertVideoToAudio() async if (_pickedVideo != null) bool? permissionGranted = await _requestStoragePermission(); if (permissionGranted != true) print("Storage permission denied."); return; String videoPath = _pickedVideo!.path; _outputPath = await getOutputFilePath(); // Get platform-specific path try // Ensure the output directory exists await (...)
• 10:30
  ffmpeg: removing hard subtitles from video [closed] - cahro88 Newest 'ffmpeg' Questions - Stack Overflow
  Is it possible to remove, e.g. to interpolation like done in images, hard embedded subtitles/text from a video using ffmpeg or any other solution for Linux? Example: https://www.youtube.com/shorts/2ZIwg9fjev0 I already tried it with images, thumbnail without subtitles and image with subtitles. Which worked quite fine. Is there any solution for videos out there?
• 17:21
  FFmpeg | Option loop not found - Praveen Tamil Newest 'ffmpeg' Questions - Stack Overflow
  The loop option is not working with gif image. When I'm working with png image the code good. But when I'm working with animated gif image the error is thrown Option loop not found. In my example I'm trying to create the video from input image with specific duration. ffmpeg -loop 1 -t 5 -i 15324210315b56e3a78abe5.png -i watermark.png -filter_complex "[0]scale=trunc(iw/2)*2:trunc(ih/2)*2[v];[v][1]overlay=x=(W-w-10):y=(H-h-10)" output.mp4 Below command is not working ffmpeg -loop 1 -t 5 -i 15323488345b55c9a2b2908.gif -i (...)
• 13:21
  Pass ffpmeg OpenCL filter output to NVenc without hwdownload? - w1th0utnam3 Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to do tonemapping (and resizing) of a UHD HDR video stream with ffmpeg. The following command: ffmpeg -vsync 0 -hwaccel cuda -init_hw_device opencl=ocl -filter_hw_device ocl -threads 1 -extra_hw_frames 3 -c:v hevc_cuvid -resize 1920x1080 -i "INPUT.hevc" -vf "hwupload, tonemap_opencl=tonemap=mobius:param=0.01:desat=0:r=tv:p=bt709:t=bt709:m=bt709:format=nv12, hwdownload,format=nv12,hwupload_cuda" -c:v hevc_nvenc -b:v 8M "OUTPUT.hevc" seems to work (around 200 FPS on an RTX 3080). However, I notice that it still uses one CPU core and (...)
• 13:54
  Not able to display first frame of mp4 file with opencv and python - Jatin Parmar Newest 'ffmpeg' Questions - Stack Overflow
  I am learning opencv from the youtube and I just created the very basic program in python import cv2 as cv sources = cv.VideoCapture("test.mp4"); if not sources.isOpened(): print("Failed to open video file"); else: print("video file opened successfully"); win_name = "test" cv.namedWindow(win_name) (has_input, frame) = sources.read() if has_input: cv.imshow(win_name, frame[...,::-1]) cv.waitKey(0) sources.release() But when i run the programm i have following errors, i have tried googling it but i (...)
• 12:27
  FFmpeg adding image watermark to video process is very slow - Tushar Lathiya Newest 'ffmpeg' Questions - Stack Overflow
  I am adding image watermark to video with help of FFmpeg but FFmpeg takes an inordinate amount of time with the below command- String[] cmd = "-i",videoPath, "-i", waterMark.toString(),"-filter_complex","overlay=5:5","-codec:a", "copy", outputPath; so i tried another command which was little bit faster but increase output file size(which i do not want) String[] cmd = "-y","-i", videoPath, "-i", waterMark.toString(), "-filter_complex", "overlay=5:5", "-c:v","libx264","-preset", "ultrafast", outputPath; Some one please explain to me how to (...)
• 11:41
  Is avcodec_send_frame thread safe for a single AVFrame? - Александр А Newest 'ffmpeg' Questions - Stack Overflow
  I'm doing video transcoding live stream. The H264 input stream from the usb camera, I decided to encode the same AVFrame in different threads for streaming x264 with low bitrate and for jpg snapshots, but at some points avcodec_send_frame is successful, at others it returns error -22, and sometimes even Segmentation fault. What can be done about it? My snapshot handler is for example int SnapshotEncode(int (*callback)(const char * topic, const uint8_t * buf, int lbuf), const char * topic) const AVCodec * pCdc = avcodec_find_encoder(AV_CODEC_ID_MJPEG); if (...)
• 08:03
  Download HLS ( HTTP ) Stream video using python - LeDerp Newest 'ffmpeg' Questions - Stack Overflow
  I need to download a streaming video(from a URL) using python the command line argument would be: ffmpeg -i URL stream.mp4 I know I can use the subprocess command subprocess.call('ffmpeg -i '+ URL +' stream.mp4', shell=True) Is there any alternative like a API that I can use instead of using subprocess command

21 juin

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

• 14:23
  MPEG DASH SRD: How to properly re-assemble multiple tiles into a single tile [closed] - ATrashInTheWorld Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to build a web player that is able to stream MPEG DASH, but with SRD information in the manifest. I have a problem at the "gluing" of the tiles part. How the data is set: I have a video of a resolution of XxY, which I've divided in tiles of NxM, meaning that I now have the NxM videos of the same duration as the original one, but which is reduced to a smaller resolution, a portion from the original (seeing only the upper left corner for example). I have fragmented those tiles for the MPEG DASH streaming format, meaning an init.mp4 and the m4s fragments for (...) -- reference
• 19:56
  MSE video fragments [closed] - Bogdan Rusu Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to build a Javascript web streammer, which uses MediSource and a buffer. I append to the buffer every new fragment that is comming, which allows me to stream a video. To be more in context, its done with MPEG DASH. I have the video init.mp4 file and the m4s fragments. However, I want to add some videos that are pure mp4 video, and I cannot append them to the buffer, since they are not fragments related to the first stream. I was thinking about converting them to m4s fragment, but I don't understand how to do it. As far as I've read, m4s fragments are (...)
• 13:40
  a problem with ffmpeg using pulse mode to open audio device blocking [closed] - ZhangKun Newest 'ffmpeg' Questions - Stack Overflow
  on linux x86 system, command line terminal, music on, "ffmpeg -f pulse -i xxxx(audio dev name,is a loudspeaker) /tmp/xxxx.wav" run perfect , "aplay -i /tmp/xxxx.wav" can play Captured speaker sound, but, in cpp code, ... AVInputFormat * fmt = av_find_input_format("pluse"); if(!fmt) return -1; AVFormatContext *ctx = avformat_alloc_context(); if(!ctx) return -1; int ret = avformat_open_input(&ctx,"xxxx dev name",fmt,NULL); //block....... ... why ternimal not,code blocking,Does anyone (...)
• 08:06
  FFmpeg error with ffmpeg.FS("readfile", "output.mp4"). trying to get ffmpeg to work in the react app - Paul Tham Newest 'ffmpeg' Questions - Stack Overflow
  const stackVideos = useCallback( async (video1) => try console.log("Fetching video2 from storage..."); const video2Ref = ref(storage, "video2.mp4"); const video2Url = await getDownloadURL(video2Ref); const video2Blob = await (await fetch(video2Url)).blob(); console.log("Writing video1 to FFmpeg FS..."); await ffmpeg.FS("writeFile", "video1.mp4", await fetchFile(video1)); console.log("Writing video2 to FFmpeg FS..."); await ffmpeg.FS("writeFile", "video2.mp4", await fetchFile(video2Blob)); console.log("Files in FFmpeg (...)
• 05:28
  Is there an elegant way to split a file by chapter using ffmpeg? - Kattern Newest 'ffmpeg' Questions - Stack Overflow
  In this page, Albert Armea share a code to split videos by chapter using ffmpeg. The code is straight forward, but not quite good-looking. ffmpeg -i "$SOURCE.$EXT" 2>&1 | grep Chapter | sed -E "s/ *Chapter #([0-9]+\\.[0-9]+): start ([0-9]+\\.[0-9]+), end ([0-9]+\\.[0-9]+)/-i \\"$SOURCE.$EXT\\" -vcodec copy -acodec copy -ss \\2 -to \\3 \\"$SOURCE-\\1.$EXT\\"/" | xargs -n 11 ffmpeg Is there an elegant way to do this (...) -- this page
• 04:42
  Segmenting video with ffmpeg not producing durations specified with -segment_time - JyrkeLumme Newest 'ffmpeg' Questions - Stack Overflow
  I have an .mp4 file that I'm trying to segment into equal duration clips of 5s each, but I cannot exactly achieve this. The input file was encoded to force key frames every 5s as follws: ffmpeg -i master.mp4 -force_key_frames expr:gte(t,n_forced*5) master_2.mp4 The first command I tried to used to achieve this is as follows, but the output files were all 8.91s in duration: ffmpeg -i master_2.mp4 -f segment -segment_time 5 -reset_timestamps 1 -output_%03d.mp4 After some research, I modified to the following, which produced better results - 4.91s each: ffmpeg (...)

20 juin

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

• 16:33
  Some mp4 files converted with ffmpeg are off by .01 frames/second, how can I fix this (without resampling) [closed] - twilightecologist Newest 'ffmpeg' Questions - Stack Overflow
  I have several mp4 files with a frame rate of 119.88 frames/second, I need to convert these to 29.97 frames/second without resampling. To do this, I ran ffmpeg -itsscale 4 -i input.mp4 -c copy output_con.mp4 However, some of these files return with a frame rate of 29.98 frames/second, this is messing me up in later analyses by throwing off some cross correlations between the mp4 files and related wav files. Any insight into how to remedy this would be much (...)
• 12:52
  HLS supported video quality control in MERN App [closed] - Utsav Raithatha Newest 'ffmpeg' Questions - Stack Overflow
  I want to convert the .mp4 video uploaded from the client side to be saved as HLS supported m3u8 playlist which contains videos for different video qualities in the server side. For this I would require ffmpeg command to do this. But the ffmpeg should be installed on the os. This would create problem if I deploy the application. What should I do? I tried ffmpeg command on windows. But it is not working.
• 16:57
  How to convert rtmp hevc video stream to srt av1 endpoint with ffmpeg? - Lulík Newest 'ffmpeg' Questions - Stack Overflow
  i want use ffmpeg to listen rtmp stream and send to srt endpoint. Flow: smartphone (camera) -> laptop (ffmpeg script) -> desktop (obs studio) ffmpeg script show warning message and in obs stuido i can see any video only audio. Thank you in advance. Console output while running script (error in the end is bcs i stoped sending data from phone): ffmpeg version git-2024-06-20-8d6014d Copyright (c) 2000-2024 the FFmpeg developers built with gcc 12 (Debian 12.2.0-14) configuration: --enable-libsvtav1 --enable-libsrt libavutil 59. 24.100 / 59. 24.100  (...)
• 11:21
  FFmpeg CPU Usage - faith0058 Newest 'ffmpeg' Questions - Stack Overflow
  Im using FFmpeg.AutoGen api to decode video stream. The problem is when i have one process, it consumes about 0.5% of cpu, screenshot from task manager: but when im trying to open more such processes (about 20) each of them takes up to 3% and its critical for me. another screenshot from task manager: Both reading packets and decoding happens in different threads. Reading func private static unsafe void Read(VideoStreamReader reader) while (true) reader.TryReadNextPacket(); public void (...)