24 avril

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

• 21:50
  Video concatenation with ffmpeg and Java - Marco Antonio Manjarrez Fernan Newest 'ffmpeg' Questions - Stack Overflow
  I have this code that automatically makes a couple of videos using ffmpeg. The result is 2 or 3 .mp4 files that consist of an audio and a still image. I want to concatenate these files automatically by using ffmpeg concat demuxer, but when the concatenation finishes the videos do concatenate, but the images are hyperimposed on top of one another. So instead of having 12 seconds of a cat image and 10 seconds of a skyscraper, I get 22 seconds of a cat image, and when I skip forward in the video the image changes to the skyscraper and doesnt change back. Every single tutorial I see has (...)
• 20:02
  2 files found with path 'lib/arm64-v8a/libc++_shared.so' from inputs...-react native - CrackerKSR Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to enable package of ffmpeg-kit-react-native in react-native. The sample commands given in the example executes successfully. But I want to use libwebp for converting gif files to webp which is under package named video. As instrcuted . I have to enable the package to use some libraries. 2.2.1 Enabling a Package on Android Edit android/build.gradle file and add the package name in ext.ffmpegKitPackage variable. ext ffmpegKitPackage = "" So I added a line in the node_module/ffmpeg-kit-react-native/android/build.gradle android (...) -- ffmpeg-kit-react-native, example, package, instrcuted
• 17:29
  Try to concatenate videos using FFmpeg Package. My videos concatenate correctly but those that i record from fornt camera rotate 90' in concatenate - Ahmad Akram Newest 'ffmpeg' Questions - Stack Overflow
  Here is my code where I pass a list of image paths that concatenate. I am facing an issue with the front camera video. When concatenated completely some videos rotate 90 degrees. Future mergeVideos(List videoPaths) async VideoHelper.showInSnackBar('Videos merged Start', context); String outputPath = await VideoHelper.generateOutputPath(); FlutterFFmpeg flutterFFmpeg = FlutterFFmpeg(); // Create a text file containing the paths of the videos to concatenate String fileListPath = '$(await (...)
• 15:01
  Why the source order matters on working with multiple media sources in a single AVFormatContext? - Mehmet YILMAZ Newest 'ffmpeg' Questions - Stack Overflow
  avformat_open_input() deletes the AVFormatContext* and returns -6 when the source order changes. I am trying to open multiple media sources dynamically with different(mixed) formats and codecs in a single context (AVFormatContext). My media sources are a BlackMagic DeckLink Duo SDI input as first source and an mp4 file or rtsp stream as second. When I order to open (avformat_open_input()) the source 2 (RTSP or MP4 file) at first and then open the BlackMagic DeckLink Duo, proceed as expected. But when I change the order, and first open the DeckLink and then try to open (...)
• 14:01
  Decode AAC with FFmpeg in RTP packet - Tran Toan Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to decode AAC in RTP packet with FFmpeg. According to rfc document the RTP payload is audioMuxElement mapped directly. I try remove the RTP header and read the remaining bytes to AVPacket struct, but the avcodec_decode_audio4() returning error -1094995529. Here is the code: #include "stdafx.h" #include "stdio.h" #include "conio.h" extern "C" #ifndef __STDC_CONSTANT_MACROS #define __STDC_CONSTANT_MACROS #endif #include #include // compatibility with newer API #if LIBAVCODEC_VERSION_INT < (...) -- rfc document
• 08:59
  How to create video editor to edit the video as fast as possible irrespective of size? [closed] - Mayur Newest 'ffmpeg' Questions - Stack Overflow
  we wanted to build a video editor where we wanted to give the option to add watermarks, change the bitrate, resize the video, add frames inside the video, etc. We are using NodeJS for the backend, I have tried to achieve the same thing with the help of ffmpeg package in NodeJS, but it is taking too much time to get the edited video. Is there any better approach that I can follow to get this done as quickly as possible? The video size could be up to 1 GB. Server Configuration 4 CPU 8 GB (...)
• 07:26
  Improving Performance and Quality of Screen Streaming(Headless) with FFMPEG and NVIDIA Hardware Acceleration [closed] - Dhairya Verma Newest 'ffmpeg' Questions - Stack Overflow
  I am attempting to stream my screen to an RTMP URL using FFMPEG with X11 for screen capture and NVIDIA's hardware acceleration to enhance performance. Despite using NVIDIA acceleration, the stream is still experiencing lags and low-quality output. I've noticed that FFMPEG is utilizing only about 100MB of GPU memory, which seems low. Here's the command I'm currently using: ffmpeg -hwaccel cuvid -f x11grab -s 1920x1080 -i :1 -f pulse -i VirtualSink.monitor -c:v h264_nvenc -preset:v p1 -b:v 2500k -maxrate 2500k -bufsize 5000k -vf (...)
• 08:01
  Slow execution of cuCtxDestroy causing Windows desktop freeze [closed] - sun Newest 'ffmpeg' Questions - Stack Overflow
  I’m encountering a problem with the cuCtxDestroy function that seems to be causing my system to freeze and result in a black screen. I’m running Windows 11 on my computer, and I would appreciate any assistance in troubleshooting this issue. When I call cuCtxDestroy, it takes more than 10 seconds to complete, during which both the GPU and CPU appear to be stuck. Eventually, the screen goes black, and in some cases, the system may recover, while in other cases, it requires a system reboot. Here is some information about my system: Integrated Intel graphics card  (...) --
• 06:55
  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 (...)
• 05:47
  idb & Ffmpeg hls video is taking lot of time to start creating video - aksh02 Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to capture a simulator's screen using idb & ffmpeg with the command idb video-stream --fps 15 --format h264 --compression-quality 1.0 --udid | ffmpeg -i pipe:0 -vcodec libx264 -threads 1 -crf 40 -preset ultrafast -f hls -g 30 -hls_list_size 0 -hls_time 5 -r 15 ./index.m3u8 This is taking around 15s to create the index.m3u8 file resulting in the loss of first 15 seconds of video. I've tried adding -tune zerolatency but this too has no effect. Idb starts video streaming right away on its own. Need help triaging why ffmpeg is (...)