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 && (...)