22 décembre

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

• 04:08
  Real time playback of two blended videos with alpha channel and synched audio in pygame? - Francesco Calderone Newest 'ffmpeg' Questions - Stack Overflow
  I need to play two videos with synched sound in real-time with Pygame. Pygame does not currently support video streams, so I am using a ffmpeg subprocess. The first video is a prores422_hq. This is a background video with no alpha channel. The second video is a prores4444 overlay video with an alpha channel, and it needs to be played in real-tim on top of the first video (with transparency). All of this needs synched sound from the first base video only. I have tried many libraries, including pymovie pyav and opencv. The best result so far is to use a subprocess with (...)
• 04:14
  Encapsulation of raw opus frames to ogg using ffmpeg.autogen - Miloš Šula Newest 'ffmpeg' Questions - Stack Overflow
  I need to encapsulate raw opus frames ( from rtpdump similar format ), but i have trouble with function ffmpeg.avformat_write_header - Error writing opus headers -1094995529 public unsafe class OpusMuxer public static void ConvertRawOpusToOggOpus(string inputPath, string outputPath, int sampleRate = 48000, int channels = 2) ffmpeg.av_log_set_level(ffmpeg.AV_LOG_INFO); AVOutputFormat* fmt = ffmpeg.av_guess_format("ogg", null, null); if (fmt == null) Console.WriteLine("Nepodařilo se zjistit výstupní formát (ogg).");  (...)
• 01:13
  Read multiple frames in demuxer - Aycon Newest 'ffmpeg' Questions - Stack Overflow
  I use FFmpeg.AutoGen. This is C# wrapper of ffmpeg (7.0) C++ library for reading mediafiles and generate stream of frames for other application. I want get n frames and hold pointers in memory indefinitely. However, I am completely confused trying to figure out which API is deprecated and how I can tell ffmpeg to hold the pointers in memory until I tell it to. I don't want to copy the frame after receiving it if I can avoid it. I tried many ways. My last attempt was to receive the frames using ffmpeg.avcodec_send_packet(), ffmpeg.av_read_frame() and (...) -- manual

21 décembre

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

• 21:12
  Detect if an interlaced video frame is the Top or Bottom field? - Danny Newest 'ffmpeg' Questions - Stack Overflow
  I'm decoding video PES packets (packetized elementary stream) containing H.264/AVC and H.265/HEVC using libavcodec like this: while (remainingESBytes > 0) int bytesUsed = av_parser_parse2( mpParser, mpDecContext, &mpEncPacket->data, &mpEncPacket->size, pIn, remainingESBytes, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0); // send encoded packet for decoding int ret = avcodec_send_packet(mpDecContext, mpEncPacket); if (ret < 0) // failed continue; while (ret >= 0) ret = (...)
• 14:35
  My discord music bot is not playing the entire music - james12 Newest 'ffmpeg' Questions - Stack Overflow
  My discord music bot based on discord.py, yt_dlp and ffmpeg is not working. I downloaded every module that is required and added environmental variables. But, my discord bot is not working properly. The bot plays the music properly at first, but the music ends before the song finishes. Full code below: import discord from discord.ext import commands import yt_dlp app = commands.Bot(command_prefix='!', intents=discord.Intents.all()) ydl_opts = 'format': 'bestaudio/best', 'extractaudio': True,  (...)
• 15:03
  Python aiortc: How to record audio and video come from client in the same file? - Chris P Newest 'ffmpeg' Questions - Stack Overflow
  I have an aiortc app, which html5 client send data (microphone,camera) into server. In server side i sucessfully played this two streams seperatly. But when i try to record using aiortc MediaRecorder helper class, only the voice is recording, and the video is dropped (mp4 format). I think this is due sync issue. The audio_frame and the video_frame (each pair of them) have different time_base. (I don't know if this is strange). But it also has different time. I can share code, but couldn't help at all right now. Edit: I also tried to (...)
• 01:21
  How to render a blend of two videos with alpha channel in python in real time? [closed] - Francesco Calderone Newest 'ffmpeg' Questions - Stack Overflow
  I need to play two videos in real time in Python. One video is a background video with no alpha channel. I am using H264 but it can be any codec. The second video is an overlay video. This video with an alpha channel needs to be played in real-time on top of the first video. I am using Quicktime 444 with an alpha channel but again, it can be any codec. In terms of libraries, I tried a combination of cv and numpy, I tried pymovie, pyAV, ffmpeg... so far, all the results have been unsuccessful. When the videos render, the frame rate drops way below 30FPS, and the resulting (...)
• 10:41
  How to render two videos with alpha channel in real time in pygame with synched audio? - Francesco Calderone Newest 'ffmpeg' Questions - Stack Overflow
  I need to play two videos with synched sound in real-time with Pygame. Pygame does not currently support video streams, so I am using a ffmpeg subprocess. The first video is a prores422_hq. This is a background video with no alpha channel. The second video is a prores4444 overlay video with an alpha channel, and it needs to be played in real-tim on top of the first video (with transparency). All of this needs synched sound from the first base video only. I have tried many libraries, including pymovie pyav and opencv. The best result so far is to use a subprocess with (...)
• 09:51
  How to render two videos with alpha channel in real time in pygame? - Francesco Calderone Newest 'ffmpeg' Questions - Stack Overflow
  I need to play two videos with synched sound in real-time with Pygame. Pygame does not currently support video streams, so I am using a ffmpeg subprocess. The first video is a prores422_hq. This is a background video with no alpha channel. The second video is a prores4444 overlay video with an alpha channel, and it needs to be played in real-tim on top of the first video (with transparency). All of this needs synched sound from the first base video only. I have tried many libraries, including pymovie pyav and opencv. The best result so far is to use a subprocess with (...)
• 09:57
  Rounded corners in subtitle (Advanced Substation Alpha [.ass]) - Leander Mihm Newest 'ffmpeg' Questions - Stack Overflow
  Is it possible to have rounded corners with the BorderStyle 4 in .ass (Advanced Substation Alpha)? I only found out that the BorderStyle 4 exists, because I was looking at this stackoverflow. Is there any good and complete documentation of the Advanced Substation Alpha format? I'm currently using the following configuration: BorderStyle=4 Outline=10 --
• 05:49
  How to improve the fluency of rtsp streaming through ffmpeg (processing 16 pictures at the same time) - Ling Yun Newest 'ffmpeg' Questions - Stack Overflow
  When the button is clicked, I create 16 threads in Qt, and then pass the rtsp data address and the label to be rendered to the process, and then the process does this: run: void rtspthread::run() while(!shouldStop) openRtspStream(rtspUrl.toUtf8().constData(),index); qDebug() << "RTSP stream stopped."; emit finished(); open input stream: void rtspthread::openRtspStream(const char* rtspUrl,int index) AVDictionary *options = nullptr; AVFrame *pFrameRGB = nullptr; uint8_t (...)
• 04:02
  ffprobe newer version detect audio codec incorrectly - alancc Newest 'ffmpeg' Questions - Stack Overflow
  I find a strange problem. I have a test video with h264 video codec and aac audio codec. It is at https://drive.google.com/file/d/1YAyz5cO0kb9r0MgahCpISR4bZ_1_n8PL/view?usp=sharing I build a ffmpeg version by myself, its version is: ffprobe version 7.0.2 Copyright (c) 2007-2024 the FFmpeg developers built with gcc 14.1.0 (Rev3, Built by MSYS2 project) configuration: --enable-shared libavutil 59. 8.100 / 59. 8.100 libavcodec 61. 3.100 / 61. 3.100 libavformat 61. 1.100 / 61. 1.100 libavdevice 61. 1.100 / 61. 1.100 libavfilter 10. 1.100 / 10. (...) -- https://drive.google.com/file/d/1YAyz5cO0kb9r0MgahCpISR4bZ_1_n8PL/view?usp=sharing

20 décembre

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

• 13:13
  How to check if OpenCV VideoCapture uses multithreading or multiprocessing internally when connecting to a camera [closed] - Chen Newest 'ffmpeg' Questions - Stack Overflow
  I'm using OpenCV's cv::VideoCapture in C++ (or Python) to connect to a camera stream. I would like to know if OpenCV internally uses multithreading or multiprocessing when opening and capturing frames from the camera. Specifically, I'm curious about: Whether OpenCV spawns new threads or processes when using cv::VideoCapture. If FFmpeg is enabled as the backend, does it use multithreading or multiprocessing under the hood? How can I verify the threading or process behavior during camera streaming? What I Tried: I checked the (...)
• 16:50
  Cannot display a decoded video frame on Raylib - gabriel_tiso Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to explore libav and raylib just to understand how audio and video work, and also to learn how to build nice interfaces using the raylib project. I've implemented a simple struct capable of decoding audio and video frames. When a video frame appears, I convert it to the RGBA format, which packs the values into 32bpp. This is the setup: if (av_image_alloc((uint8_t **)media->dst_frame->data, media->dst_frame->linesize, media->ctxs[0]->width, media->ctxs[0]->height, AV_PIX_FMT_RGBA, 1) < 0) fprintf(stderr, "Failed to setup dest image\\n");  (...) --
• 11:02
  FFMPEG spoils the extreme pixels when converting and cropping images [closed] - Jacob Newest 'ffmpeg' Questions - Stack Overflow
  I have a side image processing task in my work. I am using the following command to translate a spherical panorama into a cubemap: Path/ffmpeg.exe -i "Path/PanoImageInput.png" -vf v360=equirect:c6x1:fin_pad=64:out_frot=002200,scale=-1:2048:flags=neighbor "Path/CubemapOutput.png" And then I slice it into separate images, 1 face for example: Path/ffmpeg.exe -i "Path/CubemapOutput.png" -vf crop=2048:2048:0:0 -sws_flags neighbor "Path/face_1.png" I get artifacts on both cubemap and images of this kind that really bother me: Cubemap image junction The junction (...) -- Cubemap image junction, The junction and part of the edge of the cubemap image
• 10:23
  LibAV: converting PTS to frame number - Michael IV Newest 'ffmpeg' Questions - Stack Overflow
  I am developing an mp4 demuxer with LibAV. I need a helper function which converts PTS to frame numbers. I came up with the following code which works. But I am not sure how correct it is in the LibAV realm for any video input. In my case video fps = 25, timescale = 25000. Each next PTS is incremented by 40,giving me correct frameNumber. static double get_frame_rate(AVStream* stream) if (stream->r_frame_rate.num > 0 && stream->r_frame_rate.den > 0) return av_q2d(stream->r_frame_rate); else if (stream->avg_frame_rate.num > 0 && (...)
• 08:05
  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 (...)
• 07:57
  How to adjust audio volume with AVFilter API from FFmpeg in Linux? - wangt13 Newest 'ffmpeg' Questions - Stack Overflow
  I am working on an embedded Linux system (kernel-5.10.24), and developing an audio player by using FFmpeg and ALSA libraries. Now the basic functions are done, and I can play MP3 file by using AVCodec and SWresample interfaces of FFmpeg. int decode_play(void) ..... while (1) if (av_read_frame(pfmtctx, packet) < 0) avcodec_flush_buffers(pcodectx); printf("Got end of media, breaking\\n"); break; if (packet->stream_index != stream) continue; int res = avcodec_send_packet(pcodectx, packet); if (res < 0)  (...)
• 01:18
  ffmpeg underutilizes cpu on AWS EC2 instance [closed] - Denis Newest 'ffmpeg' Questions - Stack Overflow
  i'm running video encoding with ffmpeg on EC2 instance (c5.xlarge - 4 vcpus) ffmpeg \\ -i "$INPUT_URL" \\ -c:v libvpx-vp9 -b:v 1M -threads 4 \\ -tile-columns 1 -frame-parallel 1 \\ -row-mt 1 \\ -cpu-used 0 \\ -quality 1 \\ -speed 3 \\ -r 6 \\ -f segment -segment_time "$SEGMENT_DURATION" -reset_timestamps 1 \\ "$OUTPUT_DIR/$OUTPUT_FILE_PREFIX$(date +%s)%03d.webm" > ffmpeg.log 2>&1 & I expected the CPU utilization to be around 390%, but I observed it to be around 170% via top why and what i'm doing (...)
• 00:16
  iOS Radio App: Need to extract and stream audio-only from HLS streams with video content - Bader Alghamdi Newest 'ffmpeg' Questions - Stack Overflow
  I'm developing an iOS radio app that plays various HLS streams. The challenge is that some stations broadcast HLS streams containing both audio and video (example: https://svs.itworkscdn.net/smcwatarlive/smcwatar/chunks.m3u8), but I want to: Extract and play only the audio track Support AirPlay for audio-only streaming Minimize data usage by not downloading video content Technical Details: iOS 17+ Swift 6 Using AVFoundation for playback Current implementation uses AVPlayer with AVPlayerItem Current Code Structure: class StreamPlayer: (...) -- https://svs.itworkscdn.net/smcwatarlive/smcwatar/chunks.m3u8, https://mbcfm-radio.mbc.net/mbcfm-radio.m3u8
• 00:06
  ffmpeg command not found but pip list shows ffmpeg - your_doomsday07 Newest 'ffmpeg' Questions - Stack Overflow
  I have been trying to install ffmpeg using the command pip install ffmpeg and I am doing this in a server where we dont have sudo permissions. On writing ffmpeg I get ffmpeg: command not found. Then I checked with pip list and it showed ffmpeg. Please help me.

19 décembre

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

• 23:26
  Accurately calculate concatenated audio file size without actually concatenating for rss enclosure length - askrill Newest 'ffmpeg' Questions - Stack Overflow
  A little background. Im working on implementing DAI into a podcast hosting and the solution I’m working with is splitting the audio file for mid role ads and then just concatenating the files with the ad in middle. All files will be the same encoding, bitrate… what I need to figure out is what to put as the length of the encloser in the rss feed. In addition if the ad is gonna change per request then there’s no way to keep that encloser length accurate unless all the ads are the same (...)
• 20:55
  FFmpeg MOV to MP4, do I also need .OGG , .WEBM files too? - Chris Newest 'ffmpeg' Questions - Stack Overflow
  I am new to FFmpeg and I'm just getting started. I have the two following commands to take a .mov upload and downsize it and save it out as an .mp4. I also produce a thumbnail version of the same. What I am doing here seems to work well and I manage to get the .mov file from 12.5mb to about a 1mb .mp4. My question from here is, can I get away with only providing a .mp4 for the source video, or do I need to provide additional .ogg and/or .webm files too? An if so, how is that best achieved? Would I have to loop that FFmpeg command again to output new .ogg and .webm (...)
• 15:28
  ffmpeg fails to convert several ts files into one mp3 - Nadia Ghebreial Newest 'ffmpeg' Questions - Stack Overflow
  I'm joining several .ts files into one .mp3 file like this: import ffmpeg from 'fluent-ffmpeg' const tsDest = 'dir/file.ts' const mp3Dest = 'dir/file.mp3' const ff = ffmpeg(urls[0]) urls.slice(1).map(url => ff.input(url)) ff.on('error', function (err) logger.error('An error occurred: ' + err.message) reject(err) ) .on('end', function () return ffmpeg(tsDest) .videoCodec('libx264') .audioCodec('libmp3lame')  (...) -- https://github.com/damianociarla/node-ffmpeg/issues/101
• 12:31
  ffmpeg crash when updating overlay file (c# console app) - Vlad Stefan Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to develop a colsole app that can record the screen and have cpu/ram/gpu usage of the machine noted on the recording. The problem i am facing is that after a while (2-3 hours) the recording stops because ffmpeg is trying to read the filetext while my C# code tries to update the file. I managed to find out that I should use a temp file and replace the original instead of rewriting the whole file but that way I encounter another problem, ffmpeg will try to read the file while the file is replaced or even for that split second when is considered deleted. Any ideas what I should (...)
• 09:28
  FFmpeg `FileNotFoundError` ([WinError 2]) when probing a video file in Python - Mannu Newest 'ffmpeg' Questions - Stack Overflow
  I'm encountering a FileNotFoundError with the message [WinError 2] The system cannot find the file specified when trying to probe a video file using the Python ffmpeg-python library. This occurs despite the file existing, being readable, and having the correct path. I have verified file existence and permissions in my script. Here's the relevant output and my Python code: Output: Checking sample folder contents... Script location: C:\\Users\\me\\A\\B\\ProjFile\\vid_pro_tool\\src\\video_processing\\video_compressor.py Project root: (...)
• 04:39
  [ffmpeg]How to use libfdk_aac to encode pcm to constant bitrate - qyt Newest 'ffmpeg' Questions - Stack Overflow
  I have tried both libfdk_aac and aac, but the encoded PCM audio always has a variable bit rate. Why is this happening? How can I make it encode with a constant bit rate The code is as follows: #include #include #include extern "C" #include #include #include #include #include #include #include #include #include #include #include #include int main(int argc, char** argv) AVCodecContext* codec_context = NULL; const AVCodec* codec = NULL; AVFrame* frame = NULL; AVPacket* (...)

18 décembre

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

• 21:36
  sws_scale YUV --> RGB distorted image [closed] - Sami susu Newest 'ffmpeg' Questions - Stack Overflow
  I want to convert YUV420P image (received from H.264 stream) to RGB, while also resizing it, using sws_scale. The size of the original image is 480 × 800. Just converting with same dimensions works fine. But when I try to change the dimensions, I get a distorted image, with the following pattern: changing to 481 × 800 will yield a distorted B&W image which looks like it's cut in the middle 482 × 800 will be even more distorted 483 × 800 is distorted but in color 484 × 800 is ok (scaled correctly). Now (...)
• 20:12
  I need assistance of making a automated script for ffmpeg [closed] - user2614404 Newest 'ffmpeg' Questions - Stack Overflow
  Currently i use this script that GPT generated: ffmpeg -c:v av1_qsv -b:v 0 -global_quality 20 -preset veryslow -look_ahead 64 -c:a copy -c:s copy G:\\1ARC-movies\\A-View-to-a-kill.mkv -i Y:\\media\\Movies\\A_VIEW_TO_A_KILL_t05.mkv But sadly GPT being gpt, it hallucinates answers, and none of it's deeper automation code scripts were working when it made the scripts for a .ps1 script file. And as i find most of the docs quite overwhelming, i need help to simplify what i need. As i learn best when i get explained what i currently try to do, and not every variable ffmpeg can (...)
• 14:16
  How can I render a video in real time with custom parameters? - Joaquín L. Robles Newest 'ffmpeg' Questions - Stack Overflow
  Is it possible to render a video in real time with custom parameters? I'm trying to inject some parameters (text, image and other video portions) into a video template depending on user parameters, like the "Facebook 10 Years video".. The output format should be any video format such as H.264. I've been googling and asking and the closest I got is to make a video from HTML5 canvas captures, which I think is totally inefficient. Any insight or guidance would be great, (...) -- make a video from HTML5 canvas captures
• 11:47
  python - record and preview webcam at the same time, using e.g. ffmpeg - Jan Oechsler Newest 'ffmpeg' Questions - Stack Overflow
  I want to record webcam with sound using python. After tryng multiple different methods, ffmpeg with the python wrapper showed the best results. Recording works, but how can I preview the webcam at the same time, so I know where I am pointing the cam at? I've seen this post, but I dont understand how I could implement this in python, using the wrapper. Any ideas on how to do this? Or if there is another, easier, solution to record webcam video with sound and preview it simultaneously from within a python (Qt) application? This is my code so far: import (...)
• 10:16
  Create a bat file to exit FFMPEG (Windows) - user3812737 Newest 'ffmpeg' Questions - Stack Overflow
  Hello everyone I am using this bat file in order to capture my screen. ffmpeg -f dshow -i video=screen-capture-recorder -r 240001001 -q 1 lma_recording.avi When I press the q button the video capture stops. However I would like to stop the screen capturing with another bat file. I have tried this: taskkill /im ffmpeg.exe without luck Any suggestions?

17 décembre

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

• 15:37
  Recursively convert images in each subfolder into individual videos using FFmpeg - arutan edram Newest 'ffmpeg' Questions - Stack Overflow
  I am using this script to convert all images in a folder into a video. Each image is shown for 4 seconds and the script runs from a bat file. `ffmpeg -framerate 1/4 -i %%03d.jpg -pix_fmt yuv420p video.mp4` I have hundreds of subfolders each containing images with the same resolution and I want to convert them into one moive per subfolder. I might be close to a solution but it still does not do the job ⓐecho off setlocal enabledelayedexpansion :: Set the frame rate and file format set "framerate=1/4" set "image_format=%%03d.jpg" set (...)
• 22:00
  OpenCV VideoWriter using ffmpeg with "Could not open codec 'libx264'" Error - user2262504 Newest 'ffmpeg' Questions - Stack Overflow
  I am new to OpenCV, and I want write Mat images into video using VideoWriter on Ubuntu 12.04. But when constructing VideoWriter, errors came out. It seems that OpenCV invoke ffmpeg API using default parameters and ffmpeg invoke x264 using its default parameters. Then these setting is broken for libx264. Thus the "Could not open codec 'libx264'" error. Anyone has ideas to solve this problem? More specifically: anyone knows where and how OpenCV invoke ffmpeg API? how to change ffmpeg default settings using code, hopefull, can be (...)
• 19:04
  Optimizing FFmpeg/x264 Configuration for Ultra-Low Latency UDP Streaming [closed] - pourjour Newest 'ffmpeg' Questions - Stack Overflow
  I'm implementing a real-time screen streaming application using FFmpeg's libraries (libavcodec, libavformat) with H.264 encoding and UDP transport. While I have basic low-latency settings in place, I'm looking to minimize latency as much as possible while maintaining reasonable quality. Here's my current encoder configuration: // Configure codec for low latency codecContext->width = WIDTH; codecContext->height = HEIGHT; codecContext->time_base = AVRational1, FPS; codecContext->framerate = AVRationalFPS, 1; codecContext->pix_fmt = (...)
• 15:23
  FFmpeg live editing - NikxDa Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to create a video editing tool in HTML/CSS and PHP. For the video editing, I am using ffmpeg. Now, the file upload and the general editing works pretty well, but I have a problem. I would like to preview the final result inside an HTML video-tag. Thus, wenn I upload 4 clips and then select seconds 5 to 10 to be cut out, I'd like to immediately view the result so I can decide whether I want to keep it or not. Does FFmpeg support something like this? If not, what would be the best solution? (...)

16 décembre

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

• 15:12
  How do I get video frame buffer stream from a connected GoPro camera? - cleanrun Newest 'ffmpeg' Questions - Stack Overflow
  I'm creating an app that can connect to a GoPro camera and I want to get the frame buffer stream from the connected GoPro camera and use it on my iOS app (by converting the buffer data into CMSampleBuffer). I'm currently trying to use the FFmpeg library but so far it doesn't work. Here's the logic I've implemented (I'm using ChatGPT to generate the code): import Foundation import CoreMedia import AVFoundation import ffmpegkit final class FFmpegBufferProcessor: AnyBufferProcessor weak var delegate: (...) --
• 12:17
  How to Match ASS Subtitle Font Size with Flutter Text Size for a 1080p Video? - Mostafa Fathi Newest 'ffmpeg' Questions - Stack Overflow
  I’m working on a project where I need to synchronize the font size of ASS subtitles with the text size a user sees in a Flutter application. The goal is to ensure that the text size in a 1080p video matches what the user sees in the app. What I've Tried: Calculating font size using height ratio (PlayResY/DeviceHeight): I used the formula: FontSize_ASS = FontSize_Flutter * (PlayResY / DeviceHeight) While the result seemed logical, the final output in the video was smaller than expected. Adding a scaling (...)
• 10:48
  ffmpeg_kit_flutter_full : Video created from ffmpeg not showing in the web - Đoàn Thanh Thảo Newest 'ffmpeg' Questions - Stack Overflow
  I am implementing a screen capture widget to create a video. The video was successfully created in MP4 format and I can view it in my app and then I posted it to my web. However, on the web, I cannot see the video preview, only when I download the video and view it on my phone can I see it. I think the problem is that there is some missing format that makes the video not playable on Https. Here is my code: final command = '-y -f image2 -i $imagesPath ' '$fps != null ? "-r $fps" : "" ' '-vf "scale=2000:5000" ' // '-vf (...)
• 05:03
  ffmpeg hstack long list of files [closed] - Elle Fiorentino-Lange Newest 'ffmpeg' Questions - Stack Overflow
  I have 1920 images that are 1920x1080 in resolution. I've sliced each image into 1x1080 slices. They are in folders labeled img0001_slices, img0002_slices, ... img1920_slices. In the folders the slices are labeled img0001_slice_0, img0001_slice_1, ... img0001_slice_1919. I want to use ffmpeg to form new images out of the slices. New image one should be the first slice of all the original images lined up horizontally from img1920 on the left to img0001 on the right. New image two should be the second slice of the original images in the same order, new image three should be the third, (...)
• 04:28
  ffmpeg complex concat audio [closed] - s0mbre Newest 'ffmpeg' Questions - Stack Overflow
  I've got one video file (let's say "vid.mp4") and two audio files ("1.aac" and "2.aac") as inputs. I need to replace two parts in the original video's sound track with these two new audios, while retaining the original video track. The first cutout is at timecode from 0.44 to 1.85 sec. The second is from 15.6 sec to end of video. I'm doing it like this: ffmpeg -y -i vid.mp4 -i 1.aac -i 2.aac -filter_complex "[0:a]atrim=end=0.44[a1]; [0:a]atrim=start=1.85:end=15.6; [a1][1:a][a2][2:a]concat=n=4:v=0:a=1[a]" -map 0:v -map "[a]" -c:a aac out.mp4 But (...)
• 02:42
  ffmpeg concat and preserve metadata streams - Andrew Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to concat multiple files that are the result of a GoPro Hero6 splitting movies to avoid the FAT 4GB limit. ffmpeg works great for this purpose but I need the telemetry data that is encoded in the metadata streams, and ffmpeg by default doesn't seem to preserve this. Using the ffprobe command you can see that the source videos have: Stream #0:3(eng): Data: none (gpmd / 0x646D7067), 36 kb/s (default) Metadata: creation_time : 2018-07-15T16:16:26.000000Z handler_name : GoPro MET I know from research that this is the stream I need (...)

15 décembre

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

• 10:21
  how to change ffmpeg time format information? [closed] - Martin Martin Calden Calden Newest 'ffmpeg' Questions - Stack Overflow
  I am using the freezedetect filter and the time format keeps appearing as seconds. that is really bothering me because I need to calculate it to minutes for editing and it takes time. how can I change the default time format to hh:mm:ss ? this is the command I use to detect freezeframe: ffmpeg -i freeze.mp4 -vf "freezedetect=n=-60dB:d=1" -map 0:v:0 -f null - I am not really understand how to change it. and this is the result: [freezedetect ⓐ 0000025e6b92ee80] lavfi.freezedetect.freeze_start: 348.958008 [freezedetect ⓐ 0000025e6b92ee80] (...)
• 22:11
  hls.js unable to maintain seek with live video [only] stream - Rob Newest 'ffmpeg' Questions - Stack Overflow
  I am encoding a live 25 FPS 950x540 H.264 video-only stream using the latest (built from source) FFmpeg, 10 segments in the manifest, each of 5 seconds, and consuming that stream on another machine on my local LAN in [incognito to avoid cache issues] Chrome with the latest hls.js (cdn.jsdelivr.net/npm/hls.jsⓐlatest). The encoded video plays but not reliably; I have two problems: When the stream is running, the hls.js client starts to be unable to sync with the video stream after a few minutes, complaining of being beyond the end of the sync window and, on re-sync, getting empty (...) -- https://github.com/RobMeades/watchdog/blob/83e718390f779a7ef98d2be009784e8be5deaf5f/software/watchdog.cpp#L933