27 avril

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

• 10:05
  How to slide mutiple images left continuously? - mikezang Newest 'ffmpeg' Questions - Stack Overflow
  I use ffmpeg to slide images from left to center as below: #slide 1st image from right to center #countdown 10 seconds #slide 1st image from center to left and in the same time #slide 2nd image from right to center #countdown 10 seconds #... ffmpeg -loglevel quiet -loop 1 -i input.png -filter_complex "split=2[bg][slider];[bg]drawbox=c=black:t=fill[bg];[bg][slider]overlay=x='max(W-w*t,0)':y=0" -t 10 -y output.mp4 There is black background between two images, I want to the preious page keep slide from center to left and next page slide (...) --
• 05:57
  Python pydub issue: Can't repoen a wav file after it as been reencoded by ffpeg - Trent Tompkins Newest 'ffmpeg' Questions - Stack Overflow
  I have a python script that reads in all the *.wav files in a directory and saves them in a folder called output after it adjusts their volume. lower.py: import os from pydub import AudioSegment as ass # get the current working directory current_working_directory = os.getcwd() all_files = os.listdir(); while len(all_files) > 0: file = all_files.pop() song = ass.from_wav(file) song = song - 16 song.export('out\\\\'+file) https://github.com/tibberous/ChangeWavVolume/tree/fixed The (...) -- https://github.com/tibberous/ChangeWavVolume/tree/fixed
• 05:05
  How to use CUDA to decode video in FFmpeg.AutoGen? - JongSeong Kim Newest 'ffmpeg' Questions - Stack Overflow
  FFmpeg.AutoGen version: 7.0 Following is similar with Program.cs in "FFmpeg.AutoGen.Example" directory. var sourceSize = vsd.FrameSize; var sourcePixelFormat = AVPixelFormat.AV_PIX_FMT_CUDA; var destinationSize = sourceSize; var destinationPixelFormat = AVPixelFormat.AV_PIX_FMT_BGRA; VideoFrameConverter vfc = new VideoFrameConverter(sourceSize, sourcePixelFormat, destinationSize, destinationPixelFormat); However, when 'ffmpeg.sws_getContext' is called, ffmpeg shows below error message. ffmpeg error message: [swscaler ⓐ 000001b7af30aa00] (...)
• 00:47
  Sample rate conversion doesn't work (SWR) - kitty uwu Newest 'ffmpeg' Questions - Stack Overflow
  I need to write function in C that changes sample rate of one audio channel (float linear array). I have this now: int resample_audio(float *audio_input, int input_sample_rate, int output_sample_rate, int input_num_of_samples, float *audio_output, int *result_num_of_samples) SwrContext* swr_ctx = swr_alloc(); if (!swr_ctx) fprintf(stderr, "Could not allocate SwrContext\\n"); return -1; av_opt_set_int(swr_ctx, "in_channel_layout", AV_CH_LAYOUT_MONO, 0); av_opt_set_int(swr_ctx, "out_channel_layout", AV_CH_LAYOUT_MONO, 0);  (...)

26 avril

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

• 20:31
  How to apply the same FFMPEG slide transition for every slide in a sequence? - will Newest 'ffmpeg' Questions - Stack Overflow
  I have an ffmpeg command to create an MP4 video from a sequence of N x JPEG slides. That is, I do not know how many slides there are in the sequence, it is just a directory of JPEG-s. I'd like to apply a common slide transition for every slide in the sequence. All the examples I've read seem to need to know how many slides there are before the filter is written. The idea is to use one (simple) transition/filter for every slide. So far the script looks like this: play_duration="-framerate 1/10" # 10 seconds for testing ffmpeg \\ $play_duration \\  (...) -- How to Create a Slideshow from Images using FFmpeg
• 18:30
  FFmpeg RTSP Recording: Video Timestamp Does not Match With Recorded MP4 File Timestamp [closed] - lastpeony4 Newest 'ffmpeg' Questions - Stack Overflow
  I'm currently testing by streaming a 30 fps example flv video using a local Happy-Time RTSP server. This is the flv file i am streaming with RTSP: I recorded the video with below ffmpeg command: ffmpeg -i rtsp://127.0.0.1:6555/test30fps.flv -c copy test30fps.mp4 The resulting video appears visually satisfactory, yet there's a discrepancy between the displayed time on the video and the actual duration of the video file. Although the MP4 file duration is correct (endRecordingTimeMs-startRecordingTimeMs= mp4 file duration), the time displayed within (...) -- ,
• 15:46
  HLS audio stream choppy in iOS and Mac Safari - but ok in Chrome, VLC - Elliot Newest 'ffmpeg' Questions - Stack Overflow
  I have an HLS stream that seems to have the audio cut out and then return randomly. This only occurs on iOS devices, and Safari on Mac OS. It works fine on Desktop VLC, but not iOS VLC (as in, the audio never cuts out). More confusing still - if we have multiple developers listening to the same HLS stream on different devices at the same time, we all hear the audio cut out and the return at the same time. So clearly something is wrong with the stream itself. We create a dash stream from FFMPEG, and then create an HLS manifest in parallel. transcoder // Right now this (...)
• 14:11
  Multithreading decoding A/V streams via FFmpeg + JNI + Android NDK causes artifacts - tretdm Newest 'ffmpeg' Questions - Stack Overflow
  It would seem that if I mute the callback for reading the audio buffer, then they disappear. FFmpeg decoding issues in picture I'll attach the code below to make it easier for you to understand what the problem is: ffwrap.cpp static void *audioDecoderThread(void *arg) AudioDecoder *audioDec = (AudioDecoder*) arg; audioDec->prepare(); audioDec->start(); static void *videoDecoderThread(void *arg) VideoDecoder *videoDec = (VideoDecoder*) arg; videoDec->prepare(); videoDec->start(); // ... void (...) -- FFmpeg decoding issues in picture
• 09:01
  How to Terminate a Process Normally Created using ProcessBuilder - Bilal Ahmed Yaseen Newest 'ffmpeg' Questions - Stack Overflow
  I am creating Processes using ProcessBuilder in my Java Application. The created process executes some FFMPEG commands which actually copy the RTSP streams in specified destination media file. ProcessBuilder builder = new ProcessBuilder("ffmpeg", "-i", RTSP_URL, "-f", fileFormat, destFilePath); Process processToExecute = builder.start(); I want to close the process before it completes its execution. So, If I run this FFMPEG command directly in windows CMD and then press 'CTRL+C' after 5 seconds then process get terminates with status '2'. And I (...)
• 02:40
  Decode MPEG-2,4 AAC LATM Bitstream to .wav files [closed] - buliet suka Newest 'ffmpeg' Questions - Stack Overflow
  I'm tring to use ffmpeg to transform the AAC LATM raw data to WAV file(or mp4 file), but it shows Error. Is the command correct? enter image description here Part of the raw data: enter image description here I use ffmpeg to change AAC ATDS file to mp4 file, succeed. enter image description here Part of the ATDS file: enter image description here Maybe the raw data format is not correct, but I dont know how to change it. Please help (...) -- enter image description here, enter image description here, enter image description here, enter image description here
• 06:09
  How to play streaming media of rtmp/rtsp protocol in .NET MAUI Android/iOS? - han zhu Newest 'ffmpeg' Questions - Stack Overflow
  As far as I know, there are many solutions on Windows (winform/wpf). The most typical ones are to call the libvlcsharp and ffmpeg libraries. However, for .NET MAUI Android/iOS, I have not found the corresponding support library at present. In fact, my purpose seems very simple. I want to use MAUI to implement a real-time streaming media player that can support the rtmp/rtsp protocol. Does anyone know of any good solutions? Thanks I tried the MediaElement from the community toolkit but it doesn't support rtmp so I'm hoping to find a solution to support rtmp live streaming in (...)

25 avril

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

• 13:43
  Difficulty getting the expected output for .avi conversions to .mp4 using FFMPEG [closed] - Ericel Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to write a video converting script that converts an input video file to .mp4 output. I am using ffmpeg libx264 encoder. Unfortunately, when I convert from .avi to .mp4, the output video is not smooth, a little skippy. Here is how I set up the encoder code: AVCodecContext *Video::setupVideoEncoder(const AVCodec *encoder, AVStream *inVideoStream, AVFormatContext *outFormatCtx) AVCodecContext *codecCtx = avcodec_alloc_context3(encoder); if (!codecCtx) std::cerr << "Failed to allocate the video codec context." << std::endl; return (...)
• 22:17
  How do I include FFMpeg for development in a windows program? - Lama Mao Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to follow a tutorial about using the FFMpeg libraries to extract frames from videos in C++ (by Bartholomew). In order to include the libraries, according to the tutorial, it is advised to use pkg-config to find the libraries and put them together so that CMake can include them. In the video he uses homebrew to install ffmpeg and somehow pkg-config is able to find the header files for ffmpeg (libavcodec, libavformat, libavdevice ...) The problem is I don't know how to get the ffmpeg libraries installed so that pkg-config can find them. On (...) -- by Bartholomew
• 20:02
  How to copy CUdeviceptr planes from FFmpeg AVFrame into my own CUDA memory? - SexyBoooom Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to copy a frame planes decoded by FFmpeg(CUDA) into my own CUDA memory, but i tried a lot of times and all failed. 1, from FFmpeg doc, it says: /// HW acceleration through CUDA. data[i] contain CUdeviceptr pointers exactly as for system memory frames. ⓐAV_PIX_FMT_CUDA = 117 that means AVFrame.data[n] are the CUdeviceptr to copy from. 2, i have created my own CUDA memory without problem: var dstPtr = new CUdeviceptr(); var error = cuMemAlloc_v2(ref dstPtr, length); 3, try to copy from AVFrame into dstPtr, but failed: var (...) --
• 17:26
  Error with FFmpeg and FS in React: "ErrnoError: FS error" - namwan Newest 'ffmpeg' Questions - Stack Overflow
  I'm working on a React application where I'm using the ⓐffmpeg/ffmpeg library to compress images and videos. I'm facing an issue with the virtual file system (FS) when trying to read and write files using FFmpeg. I'm getting the following error: ErrnoError: FS error Here's the relevant part of my code: import React, useState from "react"; import FFmpeg from "ⓐffmpeg/ffmpeg"; const ffmpeg = new FFmpeg(); const fetchFile = async (filePath) => const file = await ffmpeg.readFile(filePath); alert("hello");  (...)