11 July

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

• 23:49
  FFmpeg error: Unable to find a suitable output format for '' - Benjamin Basmaci Newest 'ffmpeg' Questions - Stack Overflow
  I'm new to ffmpeg as well as Android programming. I'm trying to load a video from a URL and crop it with ffmpeg. I want to save that video to a file. This is the command I found online: "-i " + videoUrl + "-filter:v crop=240:120:100:100 -c:a copy test.mp4" I have tried it and got the error Unable to find a suitable output format for '' So I tried to narrow the possible cause down and tried these commands as well: "-i " + videoUrl + " -c:v copy -c:a copy test.mp4" "-i " + videoUrl + " -c:v copy test.mp4" "-i " (...)
• 23:26
  Set specific frame as thumbnail for video? - noClue Newest 'ffmpeg' Questions - Stack Overflow
  I just want some confirmation, because I have the sneaking suspicion that I wont be able to do what I want to do, given that I already ran into some errors about ffmpeg not being able to overwrite the input file. I still have some hope that what I want to do is some kind of exception, but I doubt it. I already used ffmpeg to extract a specific frame into its own image file, I've set the thumbnail of a video with an existing image file, but I can't seem to figure out how to set a specific frame from the video as the thumbnail. I want to do this without having to extract the (...)
• 22:33
  Playback FFmpeg stream through UDP - Andrew Raleigh Newest 'ffmpeg' Questions - Stack Overflow
  I'm using the following command to send ffmpeg data: ./ffmpeg -i "" -pix_fmt yuv420p -tune zerolatency -preset ultrafast -f mpegts udp://127.0.0.1:23000 I then transmit and receive it to another computer through the srt protocol, and read it back on the end-point. I play back with .\\ffplay.exe -i udp://127.0.0.1:23000 -loglevel 40 and don't see a video. I can see data coming in from WireShark though. This is the log output: ffplay version N-98438-gc6cdfdf9c3 Copyright (c) 2003-2020 the FFmpeg developers built with gcc 10.1.0 (Rev3, Built by MSYS2 (...)
• 21:40
  How to add a new filter to ffmpeg library - Croolman Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to add functionality to FFmpeg library. The issue is that in developer guide there are just general instruction on how to do it. I know that when I want to add something to ffmpeg I need to register the new functionality and rebuild the library so I can then call it somehow like so: ffmpeg -i input.avi -vf "myfilter" out.avi I do not want to officialy contribute. I would like to try to create the extra functionality and test it. The question is - is there any scelet file where the basic structure would be ready and you would just get a pointer to a new (...)
• 20:25
  Convert Webrtc track stream to URL (RTSP/UDP/RTP/Http) in Video tag - Zeeshan Younis Newest 'ffmpeg' Questions - Stack Overflow
  I am new in WebRTC and i have done client/server connection, from client i choose WebCam and post stream to server using Track and on Server side i am getting that track and assign track stream to video source. Everything till now fine but problem is now i include AI(Artificial Intelligence) and now i want to convert my track stream to URL maybe UDP/RTSP/RTP etc. So AI will use that URL for object detection. I don't know how we can convert track stream to URL. Although there is a couple of packages like https://ffmpeg.org/ and RTP to Webrtc etc, i am using Nodejs, Socket.io and (...) -- https://ffmpeg.org/, https://github.com/Basscord/webrtc-video-broadcast
• 19:34
  How to add 'now playing' song title info to an rtmp audio stream in ffmpeg - no_event_logged Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to add 'now playing' metadata to a rtmp audio stream using ffmpeg. My current ffmpeg encoder string looks like this and is working fine, just missing the now playing info: "C:\\Program Files (x86)\\ffmpeg\\bin\\ffmpeg.exe" -re -f dshow -i audio="Line 2 (Virtual Audio Cable)" -acodec libfdk_aac -profile:a aac_he_v2 -cutoff 18000 -ab 48k -ac 2 -ar 44100 -f flv "rtmp://blah.com:1935/live/mystream The playout software (StationPlaylist) exports the current song title to C:\\NowPlaying\\nowplaying.txt but I have no idea how to get ffmpeg to inject this / keep it (...)
• 19:10
  Use fluent-ffmpeg to tell if a file is a video or audio - afterglowlee Newest 'ffmpeg' Questions - Stack Overflow
  I am using node-fluent-ffmpeg module in NodeJS. It is very good that fluent-ffmpeg provides functions to get the metadata of a video and audio file. https://github.com/schaermu/node-fluent-ffmpeg#reading-video-metadata I have tried on Mac OS to use the "resolution" attribute in the metadata to tell if a file is audio only or video, i.e. if both resolution.w and resolution.h are 0, then this file is an audio. This work fine on Mac OS. But some strange things happened that this doesn't work on Windows platform (I have tried Windows 7 64bit and Windows 2008) using (...) -- https://github.com/schaermu/node-fluent-ffmpeg#reading-video-metadata
• 18:15
  FFmpeg causing AttributeError: __enter__ on Win10 - Marci Newest 'ffmpeg' Questions - Stack Overflow
  I have a python code which runs perfectly on win7, but i struggle for hours now making it work on my win10 laptop. Before manually installing FFmpeg i receive the error "assert _HAS_FFMPEG, "Cannot find installation of real FFmpeg (which comes with ffprobe)." AssertionError: Cannot find installation of real FFmpeg (which comes with ffprobe)" so i downloaded, unzipped FFmpeg and set up the PATH. From now on i always receive the following error: with FFmpegReader(str(sourcepath)) as src: AttributeError: __enter__ I red that this error has something (...)
• 16:36
  Getting List of default argument values if not used in FFMPEG command execution - Pradeep Prabhu Newest 'ffmpeg' Questions - Stack Overflow
  When I use FFMPEG to capture a live IPTV stream on my MAC, I generally end up with an interrupted video. When I send these four arguments, the capture is successful. reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2 I don't want to specify these arguments everytime, So I decided to update the default values in the source code. Unsure if I have done it right - I updated http.c which contains these arguments. I re-compiled FFMPEG successfully. I want to know if my changes are applied. Is there a way I can list out all the default values of the (...)
• 15:30
  How to add a thumbnail to a .webm video with FFmpeg - Claudio Ciccarone Newest 'ffmpeg' Questions - Stack Overflow
  I have a .webm video and i want to add a thumbnail to this video. With mp4 it's pretty easy to do but with webm FFmpeg gives to me this error: [webm ⓐ 0000024391cf6b80] Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM. Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument This is the comand line: ffmpeg_x64 -i "../video.webm" -i ../thumb.jpg -loglevel warning -map 1 -map 0 -vcodec copy -acodec copy ../out.webm With mp4 it's alright. I know that the problem is (...)
• 14:00
  GPUMp4Composer is Muting my video, when app is running on my phnone(android 10). But it is working fine in Emulator(android 9) - Monis Khan Newest 'ffmpeg' Questions - Stack Overflow
  I am using GPUMp4Composer for adding two things: -Filter -Watermark Both the things are working correctly in the emulator (android 9). But the resulted video from GPUMp4Composer does not have any sound (muted) when I am using the app on my phone (android 10). This is my code: Bitmap watermark = BitmapFactory.decodeResource(getResources(), R.drawable.watermark); new GPUMp4Composer(srcMp4Path, destMp4Path) .size(540, 960) .videoBitrate((int) (0.25 * 16 * 540 * 960)) .filter(new (...)
• 13:42
  Can't obtain information with ffmpeg from Smooth Streaming Manifest file - albertoiNET Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to get details for a stream of protocol Microsoft Smooth Streaming, with ffmpeg tools (ffprobe and ffplay) but when I run the next command: ffprobe -i http://b31282.cdn.telefonica.com/31282/Manifest I obtain this: http://b31282.cdn.telefonica.com/31282/Manifest: Invalid data found when processing input I assume that this Manifest file is correct and complies with standards of Smooth Streaming . This is a brief extract of Manifest file: oioAAAIAAQCUAjwAV... Is a Fedora (...)
• 12:04
  `ffmpeg record audio output device - Roy Newest 'ffmpeg' Questions - Stack Overflow
  i am trying to capture my pulse output device: alsa_output.pci-0000_00_1b.0.analog-stereo.monitor with this command: /usr/bin/ffmpeg -f pulse -i alsa_output.pci-0000_00_1b.0.analog-stereo.monitor -c:a aac -b:a 128k /roee_files/test.wav i get this output with those warnings, and there is an audio delay: ffmpeg version 3.4.7 Copyright (c) 2000-2019 the FFmpeg developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39) configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg (...)
• 11:27
  Combining 2 FFMPEG Commands - John Doe Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to combine 2 ffmpeg commands, one which creates the video, and another which adds a simple fade to the beginning of the created video. Here's what I have: ffmpeg -y -stream_loop -1 -i "video.mp4" -stream_loop -1 -i "music.mp3" -i "audio.mp3" -filter_complex "[1:a]volume=0.1[a1];[2:a]adelay=5000|5000,apad=pad_dur=10[a2];[a1][a2]amerge=inputs=2,afade=in:st=0:d=5[audio]" -map "0:v" -map "[audio]" -c:v libx264 -c:a aac -ac 2 -ar 22050 -preset veryfast -shortest "output.mp4" ffmpeg -y -i "output.mp4" -filter_complex "[0:v]fade=in:0:d=5" -c:a copy -preset (...)
• 10:00
  ffmpeg scale down video dynamically (squeeze-back) or zoompan out to smaller than original - Sam Newest 'ffmpeg' Questions - Stack Overflow
  I have 2 videos, I'm trying to overlay one on top of the other, and have it shrink down in an animated fashion until it appears like a picture-in-picture setup. Then, after a few seconds it should scale back up. This is what I am trying to achieve (these would be videos, not images): This is the closest I've been able to get, but, crucially, zoompanning "out" (as opposed to "in") does not appear to work; so, of course, this does not work: ffmpeg -i bg.mov -i top.mov -filter_complex "[0:v]zoompan=z='pzoom-0.1':d=1, setpts=PTS-STARTPTS[top]; (...) --
• 07:36
  libavfilter - inputs and outputs confusion in avfilter_graph_parse_ptr - Rahul Newest 'ffmpeg' Questions - Stack Overflow
  I am learning libavfilter library. I have used transcoding.c and filtering_video.c examples from the ffmpeg source code. They are working fine and I understood everything except one part. I have some confusion between inputs and outputs parameters of the avfilter_graph_parse_ptr If you look at here, I was expecting buffersink to go in the outputs parameter and buffersrc to the inputs. But it does it in reverse - as if inputs are outputs of the filter graph. https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/transcoding.c#L340 Same done here in another (...) -- https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/transcoding.c#L340, https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/filtering_video.c#L149
• 02:17
  ffmpeg - converting webm videos generated by Chrome is slow - Nuthinking Newest 'ffmpeg' Questions - Stack Overflow
  I generate webm files in two different ways. One using Chrome WebRTC MediaRecorder, the other one is using a js library which generates the webm video frame by frame (webm-writer-js). The file size of the videos generated is not that different, the fast one is 60% of the slow one but the difference in speed is 1000% Using the basic ffmpeg syntax -i input.webm output.mp4 the files created with Chrome's media recorder take in fact almost 10x time to be converted. The conversion logs differ slightly but overall look very similar to my novice eyes. On the left the fast (...) -- webm-writer-js,
• 00:25
  Convert video.ts file into video.mp4 using ffmpeg - HorizonBloom Newest 'ffmpeg' Questions - Stack Overflow
  So I tried to convert a file named video.ts into video.mp4 in Python and am getting the error: FileNotFoundError: [WinError 2] The system cannot find the file specified Assuming video.ts is already loaded into the program and subprocess already imported. This is due to the line: >>> subprocess.run(['ffmpeg', '-i', 'video.ts', 'video.mp4']) but I don't know what's the problem. I've opened the video.ts file and it seem to be working fine. Python version (...)