23 avril

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

• 12:47
  Generation thumbnail from video using ffmpeg [closed] - godvlpr Newest 'ffmpeg' Questions - Stack Overflow
  Try to create thumbnail from video using ffmpeg This command work perfectly: ffmpeg -i test.mp4 -ss 00:00:00 -vframes 1 thumbnail.jpg But I need to push video to ffmpeg from stdin, and find solution with pipe: cat test.mp4 | ffmpeg -f mp4 -i pipe:0 -ss 00:00:00 -vframes 1 thumbnail.jpg But it's not work for me. Error: ffmpeg version 7.0 Copyright (c) 2000-2024 the FFmpeg developers built with Apple clang version 15.0.0 (clang-1500.3.9.4) configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.0 --enable-shared --enable-pthreads --enable-version3 (...)
• 17:09
  ffmpeg xstack layout in python - konrad Newest 'ffmpeg' Questions - Stack Overflow
  I want to stack a n x n videos in a grid using ffmpeg. eg.: 4x4, 10x10, 12x12, ... Since i have a lot of videos the ffmpeg command is generated in python and then sequentially processed. The xstack filter expects a layout, which is formated in this way: xstack=inputs=16:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2|w0_0|w0_h0|w0_h0+h1|w0_h0+h1+h2|w0+w4_0| w0+w4_h0|w0+w4_h0+h1|w0+w4_h0+h1+h2|w0+w4+w8_0|w0+w4+w8_h0|w0+w4+w8_h0+h1|w0+w4+w8_h0+h1+h2 For layouts (...) -- xstack
• 16:01
  Saving RTP stream on file for later conversion to MP4 format - Alberto Pastore Newest 'ffmpeg' Questions - Stack Overflow
  I need to acquire a short RTP video stream (15 to 90 seconds) on a local on-premise small device. The device is not capable of creating natively a MP4 file by itself. The device is simply saving RTP packets on a local dump file as received. This file is then sent to a remote server after the stream has ended. I have no control on the local device (I cannot change its software or its behavior). I need to convert this RTP "dump" file to MP4 format on the remote server, where I can run my own software. I am trying to figure out a quick&dirty way to perform this (...)
• 13:10
  Got Non-monotonic DTS in output stream 0:1 while concating videos using ffmpeg - ukkkkkk Newest 'ffmpeg' Questions - Stack Overflow
  When I concat videos in this command: ffmpeg -f concat -safe 0 -i filelist.txt -c copy -y new.mp4 And filelist.txt is: file 'video1_new.mp4' file 'new3.mp4' file 'video2_new.mp4' I got [mov,mp4,m4a,3gp,3g2,mj2 ⓐ 0x7fe0eec052c0] Auto-inserting h264_mp4toannexb bitstream filter [mp4 ⓐ 0x7fe0eea04380] Non-monotonic DTS in output stream 0:1; previous: 9188352, current: 9187776; changing to 9188353. This may result in incorrect timestamps in the output file. This warning results in unpredictable things while (...)
• 10:43
  Thumbnail generation using golang+ffmpeg - godvlpr Newest 'ffmpeg' Questions - Stack Overflow
  I try to generate thumbnail from video mp4 using Golang+ffmpeg. Let me provide some steps: Tried to generate using terminal ffmpeg -i test.mp4 -ss 00:00:00 -vframes 1 thumbnail.jpg - all works successfully Tried to generate from golang and put result into stdout cmd := exec.Command("ffmpeg", "-i", "test.mp4", "-ss", "00:00:00", "-vframes", "1", "-f", "image2pipe", "-") - all works successfully Trying to open video using os.ReadFile and bytes.NewReader and after that - cmd := exec.Command("ffmpeg", "-i", "pipe:", "-ss", "00:00:00", "-vframes", "1", "-f", (...)
• 10:50
  How to read an sdp file using python - Mubashir Newest 'ffmpeg' Questions - Stack Overflow
  I am runnig following command to forward webcam using ffmpeg to a remote IP over a cellular network ffmpeg -i /dev/video0 -c:v libx264 -crf 35 -preset ultrafast -vf "eq=gamma=0.8" -f rtp "rtp://10.78.253.19:51372" following command generate an sdp file which I can save in a txt file and its icon chane into vlc which I can run on remote desktop to play/see video here is my sdp file view_camera.sdp v=0 o=- 0 0 IN IP4 127.0.0.1 s=No Name c=IN IP4 10.78.253.19 t=0 0 a=tool:libavformat 58.29.100 m=video 51372 RTP/AVP 96 a=rtpmap:96 (...)
• 05:31
  Subtitle word scaling with ASS file causing line shifting - Barrard Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to make my subtitles scale one word at a time, but I'm running into an issue with the whole line shifting. Is there a way I can scale a word, and make the other words not move sue to the scale effect? Here is the ASS File [Script Info] ScriptType: v4.00+ PlayResX: 384 PlayResY: 288 ScaledBorderAndShadow: yes [V4+ Styles] Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, (...) -- https://youtube.com/shorts/d4VaoWqTMtQ?feature=share