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

22 avril

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

• 14:54
  ffmpeg output format mp3 not available [closed] - fazzal Newest 'ffmpeg' Questions - Stack Overflow
  I am working on a Node.js application that uses ffmpeg to convert videos to mp3 files. I have installed ffmpeg full build (libmp3lame included), and I have configured the path to ffmpeg correctly in my application. However, when I try to convert a video to mp3, I get the error "Output format mp3 is not available. ffmpeg(inputPath) .outputOptions('-vn', '-ab', '128k', '-ar', '44100') .toFormat('mp3') .save(outputPath) .on('error', (err) => console.error(`Error converting (...)
• 10:16
  FFMPEG: how to overlay a moving PNG with multiply blend effect (overlay filter + blend filter) [closed] - user24565885 Newest 'ffmpeg' Questions - Stack Overflow
  I tried hunting for all existing questions and couldn't find a match :-( I have a video and a PNG image that I overlay on top of that. The PNG needs to move across the video (this I have working). But I want the PNG to use a "multiply" blend effect vs. a standard alpha overlay. Whenever I try to apply both filters I get an error. This code works and moves the image (the last one) across as expected: ffmpeg -i d6b5ec90-8823-41cf-9b81-3086ce83054a.mp4 -loop 1 -i 593e677d-02bb-49c2-a0c6-c3dd8f8c2f72.png -loop 1 -i 32fea58f-ebe1-447e-b079-06f8ebb9df52.png -loop 1 -i (...)
• 09:59
  How to set stream's metadata for LAST audio stream with ffmpeg? [closed] - Tadeusz Newest 'ffmpeg' Questions - Stack Overflow
  I want to add new audio stream (ONE) to some video file (which already has 1 or more audio streams): ffmpeg.exe -y -i "C:\\video.mp4" -i "C:\\video Fre.mp4" -c:v copy -c:a copy -map 0:v -map 0:a -map 1:1 -map_metadata 0 -metadata:s:a:0 language=eng -metadata:s:a:1 language=fre "C:\\result_1.mp4" Now I manually set language metadata for existing stream (-metadata:s:a:0 language=eng) and also manually set number for new audio stream (metadata:s:a:1). Is there any possibility set metadata for the LAST audio stream just like: -metadata:s:a:last language=fre And (...)
• 21:01
  Using ffmpeg to convert all files to a subdir with same name [duplicate] - Marc Mouton Newest 'ffmpeg' Questions - Stack Overflow
  I cannot manage to make a working script for this under Linux. Basically i want a script that execute a ffmpeg command and output the files to a subdirectory with the same name as the source. Long story short it is to convert audio from several mkv files, but i want to keep the same name and as ffmpeg doesn't overwrite files, i need to output them to a subdirectory. There is this answer : https://superuser.com/questions/912730/ffmpeg-batch-convert-make-same-filename?newreg=4676efc538b54a178fcbcc17e1fd2127 But the Linux solution: mkdir outdir for i in (...)
• 21:04
  How to run FFMPEG with --enable-libfontconfig on Amazon Linux 2 - Adrien Kaczmarek Newest 'ffmpeg' Questions - Stack Overflow
  Problem I want to run FFmpeg on AWS Lambda (Amazon Linux 2) with the configuration --enable-libfontconfig enable. Situation I already have FFmpeg running on AWS Lambda without the configuration --enable-libfontconfig. Here is the step I took to run FFmpeg on AWS Lambda (see official guide): Connect to Amazon EC2 running on AL2 (environment used by Lambda for Python 3.11) Download and package FFmpeg from John Van Sickle Create a Lambda Layer with FFmpeg Unfortunately, the version built by John Van Sickle doesn't have the configuration (...) -- see official guide, John Van Sickle, installation guide, ffmpeg-master-latest-linux64-gpl.tar.xz
• 13:27
  Websocket connection in Docker - Akhil Varghese Newest 'ffmpeg' Questions - Stack Overflow
  I have a Node.js app that takes an RTSP URL as input and provide a jsmpeg websocket stream as output. The focus of app is to generate a web compatible stream from an RTSP stream, and I have acheived this using a package rtsp-relay. The app is working fine in locally. But after dockerizing the app, I am not receiving the output stream. The stream is getting terminated. The log is The Dockerfile is: I am building the ffmpeg from source in docker. # Install necessary packages RUN apt-get update && \\ DEBIAN_FRONTEND=noninteractive apt-get (...) -- rtsp-relay, ,
• 09:55
  ffmpeg "Manifest too large" when downloading youtube video - ynn Newest 'ffmpeg' Questions - Stack Overflow
  TL;DR I'm trying to programmatically download a part of a YouTube video. The widely known procedure doesn't work for some videos and I'd like to overcome this situation. Context I'm trying to programmatically download a part of a YouTube video. As described in How to download portion of video with youtube-dl command?, you can achieve this by the following commands. #Converts a human-readable URL to longer URLs for internal use. ~ $ youtube-dl --get-url (...)
• 09:10
  output stream video produced by ffmpeg gets divided into sections on screen upon streaming - Kaustubh Sonawane Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to combine cv2 frames with numpy audio array to produce a hls playlist. I'm giving input using pipe. The problem is that while streaming the output hls playlist produced by ffmpeg, the video screen is divided into 4 parts and the sizes of the 4 parts keep getting changed slowly. Also the audio is extremely distorted. Attaching images for reference: at timestamp 00:00 at timestamp 00:03 Here is the script I have written until now: import cv2 import subprocess import numpy as np import librosa def create_hls_playlist(width, (...) -- at timestamp 00:00, at timestamp 00:03
• 08:47
  How can I found FFmpeg Error code's meaning? - Birds Newest 'ffmpeg' Questions - Stack Overflow
  I have an issue using FFMPEG. avcodec_send_packet() is returning error code -12. I am trying to find what the meaning of -12 is. I found this page but I can't understand the calculation for -12: How can I find out what this ffmpeg error code means? Can anyone help me? I'm using DXVA2 for decoding. and avcodec_send_packet() function is return -12 after the 20th frame. 20th frame return 21st frame return  (...) -- ,
• 07:45
  My ffmpeg library is not being recognised as in inter or external command when trying to convert a video in python [duplicate] - Shaahid Patel Newest 'ffmpeg' Questions - Stack Overflow
  What im trying to do in python is to convert a 4k mkv video to 1080p mp4 video using the ffmpeg library. import subprocess def convert_4k_to_1080p(input_file, output_file): cmd = f'ffmpeg -i "input_file" -crf 18 -c:v libx264 -c:a aac -s 1920x1080 "output_file"' subprocess.run(cmd, shell=True) input_file = "c:/Users/Shaahid/Videos/Movies/Series/Arcane.S01E02.2021.2160p.UHD.WEB.AI.AV1.Opus.MULTi5-dAV1nci.mkv" output_file = "c:/Users/Shaahid/Videos/Movies/Series/Test.mp4" convert_4k_to_1080p(input_file, output_file) however i (...)
• 03:01
  How to get the http status code after call avformat_seek_file of ffmpeg? - 砸石头的西西弗 Newest 'ffmpeg' Questions - Stack Overflow
  How to get the http status code after call avformat_seek_file of ffmpeg to get a http url video? I have a video source which is provided as a http url link, I want to get a snapshot of it , so I call avformat_seek_file to find a frame, but I find that it returns value is not < 0, even if the http call not return 200 or 206, so I want to know how to get the response of http calling in avformat_seek_file.
• 01:21
  FFmpeg player backporting to Android 2.1 - one more problem - tretdm Newest 'ffmpeg' Questions - Stack Overflow
  I looked for a lot of information about how to build and use FFmpeg in early versions of Android, looked at the source codes of players from 2011-2014 and was able to easily build FFmpeg 4.0.4 and 3.1.4 on the NDKv5 platform. I have highlighted the main things for this purpose: and before Android 2.2 (API Level 8) such a thing did not exist this requires some effort to implement buffer management for A/V streams, since in practice, when playing video, the application silently crashed after a few seconds due to overflow (below code example in C++ and (...) -- not officially included in Android 2.1 and above, my written build script
• 01:49
  How can I add ffmpeg to a .NET MAUI project for Android/iOS? - codybchaplin Newest 'ffmpeg' Questions - Stack Overflow
  I have looking for solutions but just don't understand exactly what to do. There are several nuget packages that seem to be wrappers for ffmpeg but don't actually include ffmpeg itself such as FFMpegCore. I have been trying to follow the steps to build for Android from ffmpeg-kit, but it keeps failing and I am at a loss. Forgive my ignorance, but why is there no straightforward way to add ffmpeg to a .NET MAUI project that can be used on (...) -- FFMpegCore, ffmpeg-kit

21 avril

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

• 13:27
  How to properly specify font file for ffmpeg as it's always defaulting to Arial? [closed] - Jim Jans Newest 'ffmpeg' Questions - Stack Overflow
  When calling ffmpeg it keeps defaulting to Arial-MT / Arial-BoldMT even when specifying a font. How do you correctly specify the fontfile? When specifying any font it will always default back: [Parsed_subtitles_0 ⓐ 000001915a83f800] fontselect: (DosisBold, 400, 0) -> ArialMT, 0, ArialMT I am calling ffmpeg with the following command: ffmpeg -i input.mp4 -vf subtitles='subtitle.srt':force_style='FontName=DosisBold,Alignment=10,Fontsize=24' output.mp4 -loglevel debug I have a file called "DosisBold.ttf" in the same folder as ffmpeg. I have (...)
• 17:12
  ffmpeg - Remove first few seconds from one of the audio streams - David Davó Newest 'ffmpeg' Questions - Stack Overflow
  I have a .mkv file with multiple audio and subtitle streams. One of these streams has unsynchronized audio, and I want to move it 10 seconds, how can I do it?
• 16:50
  Capturing and streaming with ffmpeg while displaying locally - andrixnet Newest 'ffmpeg' Questions - Stack Overflow
  I can capture with ffmpeg from a device, I can transcode the audio/video, I can stream it to ffserver. How can I capture and stream with ffmpeg while showing locally what is captured? Up to now I've been using VLC to capture and stream to localhost, then ffmpeg to get that stream, transcode it again, and stream to ffserver. I would like to do this using ffmpeg only.
• 16:46
  How to extract the audio stream from an mp4 video file? - Joan Venge Newest 'ffmpeg' Questions - Stack Overflow
  Basically I am using this python code but when I put the extracted audio stream below the video stream with the same audio, they don't line up. One interesting detail is when I used the video editor itself to save the entire audio in the project when I have only the video stream, MP3 format also has a delay/lag but when I used wav format, it matched the audio track of the video 100%. So I thought changing the code to export wav format would do the same but no. from pydub.utils import mediainfo from moviepy.editor import VideoFileClip def (...) --
• 14:41
  Embedding Subtitles Permanently with ffmpeg [closed] - Mert Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg to embed subtitles into a video file with the following command: ffmpeg -i video.mp4 -i sub.srt -max_muxing_queue_size 1024 -c:v copy -c:a copy -c:s mov_text out.mp4 After that, the subtitles are exists on the out.mp4 This generates the out.mp4 file with subtitles. However, if I delete the sub.srt file, the subtitles no longer appear in out.mp4. It seems as though the subtitles aren't actually embedded into the video but are still dependent on the sub.srt file. How can I modify the ffmpeg command to ensure that the subtitles are permanently (...)
• 11:27
  How do I use rust to read video (.mp4 or .mov) metadata on windows 11? [closed] - Hchap Newest 'ffmpeg' Questions - Stack Overflow
  I want to be able to read the metadata of .mp4 and .mov files with rust on windows 11 to find the date that the video was taken, and failing that, the file creation date. I need a step-by-step guide on how to set up the dependencies for the solution - I have tried with ffmpeg and was unable to get it working with msys2, at first I have issues with PKG_CONFIG_PATH but I resolved those, and then I specified the location of the includes in msys2 in cargo.toml, which resolved ffmpeg-sys not being able to find header files. However, I was unable to resolve the issue that rust could (...)
• 11:30
  Can we limit max fps by using FFMPEG? - Oleksandr Newest 'ffmpeg' Questions - Stack Overflow
  I want to limit max fps when I process a video. For example: set limit up to 30 frames per second. If I process a video with 24 fps then I don't change fps but if I process the video with 60 fps then I change fps to 30. Can it be done by using only FFmpeg (with filters or something else)? I think that it can be done by using filter like this: -filter:v "fps=fps='min($CURRENT_FPS,30)'" But I don't know is it possible to get current fps from an (...)
• 11:04
  ffmpeg concatenate a large number of videos with different codecs and resolutions - Paul H Newest 'ffmpeg' Questions - Stack Overflow
  The videos I am trying to concatenate can have different technical metadata, like codec, resolution, etc. So I wrote a filtergraph that works for my purposes. My complete command can look like this: ffmpeg -i "vid1.mp4" -i "vid2.mp4" -i "vid3.mp4" -filter_complex_script "filtergraph.txt" -map "[outv]" -map "[outa]" -c:v libx264 -r 60 -preset medium -crf 24 -c:a aac -b:a 160k "output.mp4" And "filtergraph.txt" looks like this (autogenerated by my own script before). I have the filters to change all input resolutions to Full HD. (Newlines in the following snippet are (...)
• 10:55
  How to concatenate multiple MP4 videos with FFMPEG without audio sync issues? - sb3k Newest 'ffmpeg' Questions - Stack Overflow
  I have been trying to concatenate a number of MP4 clips (h264,aac) using the FFMPEG concat protocol documented here. The clips concatenate successfully, however there are multiple errors in the logs including: Non-monotonous DTS in output stream Past duration too large Additionally, it seems that the audio and video go slightly out of sync as more clips are added - though it is more noticeable on certain players (Quicktime & Chrome HTML5). Here is the code I am using, any tips would be appreciated! Convert each video to temp (...) -- here
• 06:56
  Channel mapping in FFmpeg conversion of Dolby 7.1 mlp file to 8 channel wav file [closed] - Stan Duncan Newest 'ffmpeg' Questions - Stack Overflow
  I have a file with 7.1 audio with the following channel mapping (viewed using MediaInfo): L R C LFE Ls Rs Lb Rb I want to convert it to an 8 channel riff64 wave file, so I'm using the following command: ffmpeg.exe -i "input.mlp" -rf64 auto -c:a pcm_f32le "output.wav" When I do this, the channel mapping in output.wav changes to (viewed using MediaInfo): L R C LFE Lb Rb Ls Rs I'm not sure if this is just a label that gets slapped on there, or if it actually changes the channel positions (i.e., rear surround come out of side surround speakers and vice (...)
• 01:00
  Using FFMPEG and PHP to encode HLS video on the fly - mrsmith Newest 'ffmpeg' Questions - Stack Overflow
  I'm re-encoding a MP4 video to HLS using FFMPEG with PHP. I'm trying to then directly serve to the output to a HTML page's tag. The following script (encode.php) encodes the video as I require and it works if I use the script url directly in VLC player for example but I'm struggling to get the gtml page to play it. The resulting video file should be compatible with most browsers. I use video.src = 'encode.php' on my player html page. Any help appreciated. <?php $input_video = 'whatever.mp4'; // video passthrough // (...)

20 avril

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

• 23:52
  Remove random background from video using ffmpeg or Python - Raheel Shahzad Newest 'ffmpeg' Questions - Stack Overflow
  I want to remove background from a person's video using ffmpeg or Python. If I record a video at any place, detect the person in the video and then remove anything except that person. Not asking for green or single color background as that can be done through chromakey and I am not looking for that. I've tried this (https://tryolabs.com/blog/2018/04/17/announcing-luminoth-0-1/) approach but it is giving me output of rectangular box. It is informative enough as area to explore is narrow down enough but still need to remove total background. I've also tried (...) -- https://tryolabs.com/blog/2018/04/17/announcing-luminoth-0-1/, https://docs.opencv.org/4.1.0/d8/d83/tutorial_py_grabcut.html, http://oioiiooixiii.blogspot.com/2016/09/ffmpeg-extract-foreground-moving.html
• 23:35
  Error in making animation through ffmpeg (python3.9) - Taehyung Ghim Newest 'ffmpeg' Questions - Stack Overflow
  When I try to make 2D animation map for cow tracking(matching 2 camera views) through ffmpeg, following error occurs. raise subprocess.CalledProcessError(subprocess.CalledProcessError: Command '['ffmpeg', '-f', 'rawvideo', '-vcodec', 'rawvideo', '-s', '4000x4000', '-pix_fmt', 'rgba', '-r', '5', '-loglevel', 'error', '-i', 'pipe:', '-vcodec', 'h264', '-pix_fmt', 'yuv420p', (...)
• 23:13
  Convert audio files to mp3 using ffmpeg [closed] - Hrishikesh Choudhari Newest 'ffmpeg' Questions - Stack Overflow
  I need to convert audio files to mp3 using ffmpeg. When I write the command as ffmpeg -i audio.ogg -acodec mp3 newfile.mp3, I get the error: FFmpeg version 0.5.2, Copyright (c) 2000-2009 Fabrice Bellard, et al. configuration: libavutil 49.15. 0 / 49.15. 0 libavcodec 52.20. 1 / 52.20. 1 libavformat 52.31. 0 / 52.31. 0 libavdevice 52. 1. 0 / 52. 1. 0 built on Jun 24 2010 14:56:20, gcc: 4.4.1 Input #0, mp3, from 'ZHRE.mp3': Duration: 00:04:12.52, start: 0.000000, bitrate: 208 kb/s Stream #0.0: Audio: mp3, 44100 Hz, (...)
• 20:11
  Extracting frame out of video based on time in seconds - Vicky Newest 'ffmpeg' Questions - Stack Overflow
  I'm developing a web-based video editing tool where users can pause a video and draw circles or lines on it using canvas. When a user pauses the video, I retrieve the current playback time in seconds using the HTML5 video.currentTime property. I then send this time value along with the shape details to the server. On the server-side, we use FFmpeg to extract the specific paused frame from the video. The issue I'm encountering is a frame mismatch between the one displayed in the browser and the one generated in the backend using FFmpeg. I've experimented with various (...)
• 20:00
  FFMPEG - Audio conversion from MP3 to M3u8 works for some songs, not for others. Look's like it's detecting video? - Kyle Orius Newest 'ffmpeg' Questions - Stack Overflow
  Problem: I need to convert MP3s (of unknown Origin) into M3u8 files so that I can HLS stream them. This command here works for a song called 'jesussaves.mp3' ffmpeg -i ../jesussaves.mp3 -c:a aac -b:a 192k -ac 2 -f hls -hls_time 10 -preset ultrafast -flags -global_header master.m3u8 When I change it to use the song 'In my Darkest Hour' - (I've renamed the file to inmydh.mp3) - I only get one TS file output instead of multiple. The log is here: https://ibb.co/5nG0j01 Thank (...) -- https://ibb.co/5nG0j01
• 18:26
  How to run FFMPEG with --enable-libfontconfig on Amazon Lambda - Adrien Kaczmarek Newest 'ffmpeg' Questions - Stack Overflow
  Problem I want to run FFmpeg on AWS Lambda (Amazon Linux 2) with the configuration --enable-libfontconfig enable. Situation I already have FFmpeg running on AWS Lambda without the configuration --enable-libfontconfig. Here is the step I took to run FFmpeg on AWS Lambda (see official guide): Connect to Amazon EC2 running on AL2 (environment used by Lambda for Python 3.11) Download and package FFmpeg from John Van Sickle Create a Lambda Layer with FFmpeg Unfortunately, the version built by John Van Sickle doesn't have the configuration (...) -- see official guide, John Van Sickle, installation guide, ffmpeg-master-latest-linux64-gpl.tar.xz
• 14:38
  How To Convert MP4 Video File into FLV Format Using FFMPEG - nipul_tech Newest 'ffmpeg' Questions - Stack Overflow
  I have to convert an MP4 Video File into FLV format using FFMPEG which I received from different mobile device. I found most of the stuff to convert flv video into mp4 and all. Can any body help me out to convert mp4 format into flv using FFMPEG. I am using a Windows 7 64bit machine.
• 14:16
  Rotate 90 and concatenate videos with ffmpeg - leonp Newest 'ffmpeg' Questions - Stack Overflow
  I have several videos made in landscape and portrait modes. I want to concatenate them into one movie. For this I rotated portrait videos with: ffmpeg -i in.mp4 -vf transpose=1 out.mp4 Built the list of files to concatenate and concatenated all of them with: ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4 The result is unplayable. All players hang/crash at the first switch from landscape to rotated portrait fragment. What do I do wrong? In reply to LordNeckbeard request: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from (...)
• 08:26
  How to skip start frames with ffmpeg - Darko_Milicic Newest 'ffmpeg' Questions - Stack Overflow
  I have using ffmpeg to create short preview of videos... $length = $length_video/5; $ffmpeg_path." -i ".$content." -vf select='lt(mod(t\\,".$length.")\\,1)',setpts=N/FRAME_RATE/TB -af aselect='lt(mod(t\\,".$length.")\\,1)',asetpts=N/SR/TB -an ".$content_new."; Actually this will create 5sec. video. and problem is because first frame is extracted from 0-1 sec. There is any chance to skip first frame and extract next 5? Problem is because first frame is actually useless because of video (...)

19 avril

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

• 16:12
  Blend selected frames from a video and output an image with ffmpeg [closed] - xnx Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to blend a few frames from a video and output a png image using this command: ffmpeg -i input.mp4 -vf "select=between(n\\,2\\,5),blend=all_mode=average" -frames:v 1 out.png I get this error, but can't make sense of it: Simple filtergraph ... was expected to have exactly 1 input and 1 output. However, it had 2 input(s) and 1 output(s). Please adjust, or use a complex filtergraph (-filter_complex) instead. What am I doing (...)
• 09:27
  FFMPEG merge multiple audio into video in specific time [closed] - Umar Newest 'ffmpeg' Questions - Stack Overflow
  Right now i have: 1 - video (.mp4) N - audio with its timestamp start and end (.wav) I want to merge those audio to the video based on that time with still preserving the original video audio So that the final illustration will looks like this: audio ----aud1------aud2------aud3--------aud4---------audn-------> video+audio ------------------------------------------------------------> the audio position will be based on the time, i already have this data start=00:00:12.040,end=00:00:16.640 aud1 start=00:00:16.640,end=00:00:21.520 (...)
• 18:45
  SNAP: Simulation and Neuroscience Application Platform [closed] - S_S Newest 'ffmpeg' Questions - Stack Overflow
  Is there any documentation/help manual on how to use SNAP (Simulation and Neuroscience Application Platform)1. I wanted to run the Motor Imagery sample scenario with a .avi file for the stimulus instead of the image. How can that be done? The following error is obtained when using the AlphaCalibration scenario which gives code to play an avi file.Any help appreciated :movies:ffmpeg(warning): parser not found for codec indeo4, packets or times may be invalid. :movies:ffmpeg(warning): max_analyze_duration 5000000 reached at 5000000 :movies(error): Could (...) -- 1
• 18:24
  Could not update timestamps for discarded samples - skltynve Newest 'ffmpeg' Questions - Stack Overflow
  I have a function for decoding audio in C using ffmpeg: int read_and_decode(const char *filename, float **audio_buffer, int *sample_rate, int *num_samples) AVFormatContext *fmt_ctx = NULL; AVCodecContext *codec_ctx = NULL; AVCodec *codec; AVPacket packet; AVFrame *frame = av_frame_alloc(); if (!frame) fprintf(stderr, "Could not allocate memory for AVFrame\\n"); return -1; int audio_stream_index = -1, ret; if (avformat_open_input(&fmt_ctx, filename, NULL, NULL) != 0) fprintf(stderr, "Could not open the file: %s\\n", (...)
• 18:18
  Error trying to decode 4K video using NVDEC - Nestoraj Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to convert a 4K HEVC MKV file of 70GB into another HECV file but with less size. I am using FFmpeg with Nvidia acceleration but when I execute the following command an error appears: ffmpeg -y -vsync 0 -hwaccel_device 0 -hwaccel cuvid -c:v hevc_cuvid -i input.mkv -c:a copy -c:v hevc_nvenc -preset slow -b:v 10M -bufsize 10M -maxrate 15M -qmin 0 -g 250 -bf 2 -temporal-aq 1 -rc-lookahead 20 -i_qfactor 0.75 -b_qfactor 1.1 output.mkv The error is: [hevc_nvenc ⓐ 0000021036b0d000] Provided device doesn't support required NVENC features Error (...) --
• 18:16
  Problems with modifying encoder metadata with FFMPEG - yrcje Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to change FFMPEG encoder writing application with FFMPEG -metadata and for whatever reason, it's reading the input but not actually writing anything out. map_metadata -metadata:s:v:0 -metadata writing_application, basically every single stack overflow and stack exchange thread, but they all won't write to the file at all. ffmpeg -i x.mp4 -s 1920x1080 -r 59.94 -c:v h264_nvenc -b:v 6000k -vf yadif=1 -preset fast -fflags +bitexact -flags:v +bitexact -flags:a +bitexact -ac 2 x.mp4 ffmpeg -i x.mp4 -c:v copy -c:a copy -metadata (...)
• 18:13
  Decoder error not supported error when render 360 video on web application - Mattia Pompita Newest 'ffmpeg' Questions - Stack Overflow
  I'm developing a simple scene with A-Frame and React.JS where there is a videosphere that will create and render when video are fully loaded and ready to play. My goal is to render 4k (to device who can reproduce it) video on videosphere to show at the users the environment. On desktop versions all works fine also with 4K videos while on mobile works only for 1920x1080. I already check if my phone can render a 4k texture video and it can render untill 4096, I checked also that video.videoWidth are 4096. The error I have is with decoder MediaError code: 4, (...)
• 16:21
  FFmpeg dynamic cropping using sendcmd correct syntax? - Sulli Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to dynamically crop a video using FFmpeg's sendcmd filter based on coordinates specified in a text file, but the crop commands do not seem to be taking effect. Here's the format of the commands I've tried and the corresponding FFmpeg command I'm using. Following the documentation https://ffmpeg.org/ffmpeg-filters.html#sendcmd_002c-asendcmd, commands in the text file (coordinates.txt) like this: 0.05 [enter] crop w=607:h=1080:x=0:y=0; 0.11 [enter] crop w=607:h=1080:x=0:y=0; ... Ffmpeg command: ffmpeg -i '10s.mp4' (...) -- https://ffmpeg.org/ffmpeg-filters.html#sendcmd_002c-asendcmd
• 13:19
  Possible to copy PCR/PTS/DTS data between TS files? - muraliv Newest 'ffmpeg' Questions - Stack Overflow
  I've 2 h264/aac stream TS files (say a.ts and b.ts) that have same duration and packet numbers. However PCR/PTS/DTS data of their audio/video stream packets are different. How do I copy PCR/PTS/DTS data from a.ts to b.ts using ffmpeg or other tools without actually overwriting the audio and video frames data? Ideally want to do this without re-encoding.
• 11:03
  ffmpeg saving rtsp to mp4 file but video have a lot of green and gray block [closed] - UncleKing Newest 'ffmpeg' Questions - Stack Overflow
  I use ffmpeg to save IPcam rtsp to mp4 , but the video have half green or gray , here is the paramter : ffmpeg -i "rtsp://192.168.0.37/live/1" -s 1920x1080 -filter:v "fps=fps=15,drawtext=text='test':fontcolor=red:fontsize=32:x=(w-text_w)/2:y=(h-text_h)/2" -crf 36 -preset ultrafast -vcodec libx264 -an -t 10 -f mp4 tmp.mp4 and here is the strange video I need to know what's wrong ? my ipcam setting is: H264 , 2560*1440 , 20fps , fixed rate 4096Kbps , Iframe 2 seconds , (...) --
• 11:18
  Flutter error in Ffmpeg, "Unhandled Exception: ProcessException: No such file or directory" in macOS desktop version - pratik vekariya Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying video trim video using ffmpeg, for macOS desktop application. I have downloaded ffmpeg from here for macOS. Here is my code String mainPath = 'Users/apple/Workspace/User/2024/Project/videoapp/build/macos/Build/Products/Debug/'; mainPath = mainPath.substring(0, mainPath.lastIndexOf("/")); Directory directoryExe3 = Directory("$mainPath"); var dbPath = path.join(directoryExe3.path, "App.framework/Resources/flutter_assets/assets/ffmpeg/ffmpegmacos"); //here in "Products/Debug/" folder desktop app will (...) -- here
• 10:28
  How to make only words (not sentences) in SRT file by AssemblyAI - flip Newest 'ffmpeg' Questions - Stack Overflow
  Okay... So Im trying to create a video making program thing and I'm basically finished but I wanted to change 1 key thing and don't know how to... Here's the code: import assemblyai as aai import colorama from colorama import * import time import os aai.settings.api_key = "(cant share)" print('') print('') print(Fore.GREEN + 'Process 3: Creating subtitles...') print('') time.sleep(1) print(Fore.YELLOW + '>> Creating subtitles...') transcript = aai. (...)
• 09:19
  ffmpeg: convert subtitles from "hdmv_pgs_subtitle" to "mov_text" (needed in MP4) - rgr Newest 'ffmpeg' Questions - Stack Overflow
  Is there any way to convert subtitles from "hdmv_pgs_subtitle" to "mov_text" (needed in MP4). I try: ffmpeg.exe i "%%F" c copy -scodec mov_text "test.mp4" but I get: Error while opening encoder for output stream #0:2 - maybe incorrect parameters such as bit_rate, rate, width or height Stream properties: Duration: 00:01:48.14, start: 4199.920000, bitrate: 12394 kb/s Program 1 Stream #0:0[0x1011], 169, 1/90000: Video: h264 (High), 1 reference frame (HDMV / 0x564D4448), yuv420p(top first, left), 1920x1080 (1920x1088) [SAR (...)
• 04:54
  ffmpeg timelapse resets PTS on frame size change - Ral Newest 'ffmpeg' Questions - Stack Overflow
  I have 601 sequential images, they change size and aspect ratio on frame 36 and 485, creating 3 distinct sizes of images in the set. I want to create a timelapse and shave off the first 200 frames and only show the remaining 401, but if I do a trim filter on the input, the filter treats each of the 3 sections of different sized frames as separate 'streams' with their own reset PTS, all of which start at the exact same time. This means the final output of the below commmand is only 249 frames long instead of 401. How can I fix this so I just get the final 401 (...)

18 avril

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

• 18:58
  How to create an encoding ladder for any aspect ratio? - volume one Newest 'ffmpeg' Questions - Stack Overflow
  For a given video uploaded by a user, I need to create three versions of it to cover standard definition (SD), high definition (HD), full high definition (FHD), and ultra high definition (UHD e.g. 4K). "resolution/encoding ladders" for standard aspect ratios like 16:9 and 4:3. For 4:3 we might have: 640 x 480 960 x 720 1440 x 1080 2880 x 2160 For 16:9 we might have: 854 x 480 1280 x 720 1920 x 1080 3840 x 2160 If a user uploads a file in either of those aspect ratios, we can create the four different versions because the resolution (...)
• 18:15
  ffmpeg: `ffmpeg -i "/video.mp4" -i "/audio.m4a" -c copy -map 0:v:0 -map 1:a:0 -shortest "/nu.mp4"` truncates, how to loop audio to match videos? [closed] - Swudu Susuwu Newest 'ffmpeg' Questions - Stack Overflow
  This is with "FFmpeg Media Encoder" from Google Store (Linux-based Android OS), but it has all the commands of ffmpeg for normal Linux. shortest truncates the video to match the audio, and -longest has the last half of the video not have audio (for videos twice as long as audio,) what to use to loop audio (to match length of video with this)? Video length is 15:02, so used ffmpeg -i "/audio.m4a" -c copy -map 0:a:0 "/audionew.m4a"-t 15:02 -stream_loop -1`, but got (...)
• 17:55
  Replacing avcodec_decode_video/avcodec_decode_video2 with currently supported functions - Silverstock Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to build a C++ program, and the creator is using depreciated functions, I have been replacing them fairly easily, but I am not totally sure how to replace these. This is a sample from the decode file: #if defined HAVE_AVCODEC_SEND_PACKET && defined HAVE_AVCODEC_RECEIVE_FRAME AVPacket* pkt = av_packet_alloc(); if (!pkt) return 0; pkt->data=data; pkt->size=datalen; int ret = avcodec_send_packet(codecContext, pkt); while (ret == 0) ret = avcodec_receive_frame(codecContext,frameIn); if (ret != 0)  (...)
• 17:46
  Splitting my code into OpenCV and UDP and the differences between using OpenCV and UDP - Sagiv Shaniv Newest 'ffmpeg' Questions - Stack Overflow
  1) I wrote a Python code to receive video in real-time, compress it, duplicate the video, and then send it to OpenCV and UDP using ffmpeg. I would like to know how I can duplicate the code to send it to both UDP and OpenCV (without sending it to another device) without affecting the frame rate. This is the code I used so far: import subprocess import cv2 # Start ffmpeg process to capture video from USB, encode it in H.264, and send it over UDP and to virtual video device ffmpeg_cmd = [ 'ffmpeg', '-f', 'v4l2', # Input format (...)
• 14:23
  Why is FFProbe (using fluent-ffmpeg) returning incomplete and inaccurate metadata? - volume one Newest 'ffmpeg' Questions - Stack Overflow
  I am returning metadata about a file using ffprobe. The file can be found here. I am using fluent-ffmpeg in Node.js which shouldn't make any difference. Its just nicer to use than a command-line. The code goes like this: ffmpeg.ffprobe('https://devxxx001.s3.amazonaws.com/vertical-hd_720_1280_30fps.mp4'), function (err, metadata) console.log(JSON.stringify(metadata)); ); The metadata output I receive is this: "streams": [ "index": 0, "codec_name": "h264", "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 (...) -- found here
• 10:02
  How to use the latest version of ⓐffmpeg/ffmpeg in a React.js project? - Muzammil Raza Newest 'ffmpeg' Questions - Stack Overflow
  I'm working on a React.js project where I need to process videos in the browser using ⓐffmpeg/ffmpeg. I noticed that the package has been updated recently, and the API and functions have changed. In the older version, I used to import the package and functions like this: import createFFmpeg, fetchFile from 'ⓐffmpeg/ffmpeg'; However, in the latest version, I see that the import has changed to: import FFmpeg from 'ⓐffmpeg/ffmpeg'; and all new functions are changed I have checked in by log: I have check by console ffmpeg, it (...)
• 07:49
  FFmpeg - record from stream terminating unexpectedly using kokorin/Jaffree ffmpeg wrapper for Java - pyrmon Newest 'ffmpeg' Questions - Stack Overflow
  I am programming a Spring Boot Application using Maven and Java 21. I am trying to record a stream from a url and save it to a mkv file. I intend to do this with kokorin/Jaffree in version 2023.09.10. The recording seems to work ok, however longer videos are terminating unexpectedly. Sometimes after 5 minutes, other times an hour or even longer. Sometimes with Exit Code 0 and sometimes with 1. I have implemented the recording like this: ⓐOverride public void startRecording(RecordingSchedule recordingSchedule) logger.info("Starting recording for schedule with filename (...)

17 avril

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

• 22:58
  JPG Right Colors [closed] - user1897354 Newest 'ffmpeg' Questions - Stack Overflow
  For this type of video, do I get the right colors for jpgs? Color space : YUV Chroma subsampling : 4:4:4 Color range : Limited Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 For the video, I tried making jpegs using this code, but the colors did not match: ffmpeg -i input.mkv -vf zscale=min=709:m=170m:rin=limited:r=full,format=yuv444p -qmin 1 -qmax 1 -q:v 1 output%03d.jpg
• 21:15
  Split mp4 in chunks and stream to the browser? - Paul Newest 'ffmpeg' Questions - Stack Overflow
  I have a regular mp4 file which I need to store into smaller chunks in separate locations, what's the proper way of splitting the file and then have the browser be able to play it by requesting chunks? I'm a bit confused about segments and fragments, can I do all of this with a single ffmpeg command? Something to split the file into 10s chunks and then still be able to stream it in the video tag by appending to the MediaStream buffer?
• 18:36
  Remove video noise from video with ffmpeg without producing blur / scale down effect - Sucahyo Aji Newest 'ffmpeg' Questions - Stack Overflow
  My videos are 1920x1080 recorded with high ISO (3200) using smartphone (to get bright view, backlight scene mode). It produce a lot of noise. I try many video filter but all of them produce blur similar to when we reduce the resolution in half then increase it back again. Is there a good video noise filter that only remove noise without producing blur? Because if it produce blur, I would prefer to not do any filtering at all. I have tried video filter: nlmeans=s=30:r=3:p=1 vaguedenoiser=threshold=22:percent=100:nsteps=4  (...) -- Part of the image
• 07:44
  ffmpeg video created from images looks faded [closed] - Oscar Franco Newest 'ffmpeg' Questions - Stack Overflow
  I'm creating a video from a series of png images I have generated. However, on the final video the colors look faded. Is there anyway to preserve the look of the images? Here is a sample image, it might be a little hard to tell due to compression but the hue of the green changes. Here are some of the commands I've used trying to get the colors to match: ffmpeg -framerate 60 -pattern_type glob -i 'capture/*.png' -c:v libx264 -preset slower -pix_fmt yuv420p -color_range tv -colorspace bt709 -color_primaries bt709 -color_trc iec61966-2-1 (...) -- ,
• 13:03
  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 (...)
• 12:51
  ffmpeg is making my audio and video frozen and I don't know why - Sdpro Newest 'ffmpeg' Questions - Stack Overflow
  I'm using bunjs runtime to execute ffmpeg as terminal code but I don't know if my code is typescript code is wrong or ffmpeg is wrong and I'm using json file to get the clips correctly let videos = 0; let stepsTrim = ""; let concatInputs = ""; for (let i = 0; i < 40; i++) if (unwantedWords[i].keepORdelete === true) stepsTrim += `[0:v]trim=0:$ unwantedWords[i].start ,setpts=PTS[v$i];[0:a]atrim=0:$ unwantedWords[i].start ,asetpts=PTS-STARTPTS[a$i];[0:v]trim=$unwantedWords[i].start:$  (...)
• 11:27
  Python OpenCV VideoCapture Color Differs from ffmpeg and Other Media Players - cliffsu Newest 'ffmpeg' Questions - Stack Overflow
  I’m working on video processing in Python and have noticed a slight color difference when using cv2.VideoCapture to read videos compared to other media players. I then attempted to read the video frames directly using ffmpeg, and despite using the ffmpeg backend in OpenCV, there are still differences between OpenCV’s and ffmpeg’s output. The frames read by ffmpeg match those from other media players. Below are the videos I’m using for testing: test3.webm test.avi Here is my code: import cv2 import numpy as np import subprocess def (...) -- , , test3.webm, test.avi,
• 11:24
  Segmentation Fault when calling FFMPEG on Lambda - but not locally - thiagogps Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to extract the next 30 seconds of audio from a live video stream on YouTube using AWS Lambda. However, I'm facing an issue where Lambda does not wait for an FFmpeg subprocess to complete, unlike when running the same script locally. Below is a simplified Python script illustrating the problem: import subprocess from datetime import datetime def lambda_handler(event, context, streaming_url): ffmpeg_command = [ "ffmpeg", "-loglevel", "error", "-i", streaming_url, "-t", "30", "-acodec", "pcm_s16le", "-ar", "44100", (...)
• 11:12
  AWS Lambda Does Not Wait Until FFmpeg Subprocess Completes - thiagogps Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to extract the next 30 seconds of audio from a live video stream on YouTube using AWS Lambda. However, I'm facing an issue where Lambda does not wait for an FFmpeg subprocess to complete, unlike when running the same script locally. Below is a simplified Python script illustrating the problem: import subprocess from datetime import datetime def lambda_handler(event, context, streaming_url): ffmpeg_command = [ "ffmpeg", "-loglevel", "error", "-i", streaming_url, "-t", "30", "-acodec", "pcm_s16le", "-ar", "44100", (...)
• 10:53
  How to record video and audio from webcam using ffmpeg on Windows? - Babu Newest 'ffmpeg' Questions - Stack Overflow
  I want to record video as well as audio from webcam using ffmpeg, I have used the following codes to know what devices are available: ffmpeg -list_devices true -f dshow -i dummy And got the result: ffmpeg version N-54082-g96b33dd Copyright (c) 2000-2013 the FFmpeg developers built on Jun 17 2013 02:05:16 with gcc 4.7.3 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray (...)
• 09:04
  How can we merge .cdg and .mp3 file in ffmpeg - Hemant Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to merge .cdg file and .mp3 file to make .mp4 file with help of ffmpeg. I am using following command: ffmpeg -i test.mp3 -i test.cdg -y test.MP4 MP4 file was created only with mp3 audio file. cdg file contain is missing
• 06:51
  FFmpeg C++ API : Using HW acceleration (VAAPI) to transcode video coming from a webcam - nicoh Newest 'ffmpeg' Questions - Stack Overflow
  I'm actually trying to use HW acceleration with the FFmpeg C++ API in order to transcode the video coming from a webcam (which may vary from one config to another) into a given output format (i.e: converting the video stream coming from the webcam in MJPEG to H264 so that it can be written into a MP4 file). I already succeeded to achieve this by transferring the AVFrame output by the HW decoder from GPU to CPU, then transfer this to the HW encoder input (so from CPU to GPU). This is not so optimized and on top of that, for the given above config (MJPEG => H264), I (...) -- https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/vaapi_transcode.c
• 04:29
  When usg ffmpeg to convert from .mp4 to .avi, how do I get the .avi files to contain the correct (trimmed) frames from the .mp4? - cassenav Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg to convert a batch of .mp4 videos to the .avi format from the command line. The .mp4 videos are all trimmed videos that are sub-videos of a longer video. I have basically segmented the longer video into small, non-overlapping chunks (or maybe with a couple milliseconds of overlap), and I want to convert all of these smaller chunks (.mp4) to .avi. However, I am running into an issue: the .avi files all contain a some additional frames at the beginning of each video which I explicitly trimmed in the .mp4 videos. I'm not sure what exactly is causing this problem or how (...)
• 00:59
  In mp4/h264, why does duplicate a frame need intensive re-encoding with ffmpeg? - kwjsksai Newest 'ffmpeg' Questions - Stack Overflow
  What I want to achieve is to duplicate all frames in 30fps.mp4 and result in a 60 fps video. I tried ffmpeg -i 30fps.mp4 -filter:v fps=60 out.mp4. It does what I want but with re-encoding. And the question is can it be done without re-encoding but only remux? The reason I'm asking is because intuitively speaking, we usually do shallow copy when same data is used multiple times. So can it be done? Does the codec/container even allow (...)