22 October

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

• 04:17
  How can I extract some frames of a rtsp using directly python or python-opencv? - John Doe Newest 'ffmpeg' Questions - Stack Overflow
  I want to know if there is any method of Python or probably from python-opencv that allows me to extract frames from a rtsp streaming. I know that such task can be done easily using a ffmpeg library but ffmpeg uses a lot of my CPU.
• 02:44
  FFmpeg how to get the first drawtext's x,y value to the second drawtext, and change the fontsize every frame, how to create a var? - FFmpeg2019 Newest 'ffmpeg' Questions - Stack Overflow
  I have a ffmpeg code: ffmpeg -i input.mp4 -vf drawtext=text=hello:fontsize=18:x=rand(0,640):y=rand(0,480),drawtext=world:fontsize=fontsize+0.1:x=16+?:y=? output.mp4 And have three questions: How to let the "fontsize+0.1" work? The two "?" how to get the first drawtext's x,y values? let the two strings become one string like this: hello world. how to create a var?
• 02:10
  FFmpeg - RTCP BYE packets - DZoki019 Newest 'ffmpeg' Questions - Stack Overflow
  I’m working on some C++ project which depends on Wi-Fi RAK5206 electronic board. I’m using ffmpeg library to obtain video and audio stream and I have issue where I can start and stop stream for four times, but when I want to start for the fifth time I get error. Error description is Invalid data found when processing input and it happens when I call avformat_open_input function and I need to restart the electronic board, reconnect to Wi-Fi etc. I figured out with Wireshark application that VLC is working and it is sending some BYE packets when TEARDOWN is called. I wonder if error depends (...) -- rtpenc.h

21 October

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

• 21:00
  Generating a waveform using ffmpeg - krisph Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to generate a waveform image using ffmpeg. I have successfully made a waveform image, however it doesn't look very nice... I have been looking around to try and style the image to make it look nicer, however I have been unable to find any information on this or any tutorials on this. I am using PHP and shell_exec to create the waveform. I am aware that there are php library that can do this but due to file format this is a lengthy process. The code I am using is as follows: $command = 'convertvid\\bin\\ffmpeg -i Temp\\\\'.$file.' -y -lavfi (...)
• 20:45
  RuntimeError: No ffmpeg exe could be found - FFMpeg error in Windows 10 - Soumya Boral Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to run from moviepy.video.io.ffmpeg_tools import ffmpeg_extract_subclip However I am continuously getting the followng error : RuntimeError: No ffmpeg exe could be found. Install ffmpeg on your system, or set the IMAGEIO_FFMPEG_EXE environment variable. I have installed ffmpeg in my system and have added it in path. Also in cmd, ffmpeg gives proper output. So anything I am doing wrong here ?
• 20:01
  Set a subtitle language using ffmpeg - Sam Newest 'ffmpeg' Questions - Stack Overflow
  I tried googling a way to set the language of a subtitle stream with ffmpeg and found the -slang option. So I tried the following command but immediately receive an error: ffmpeg -i input.avi -i subs.srt -c:a copy -c:s mov_text -slang eng -c:v libx264 -profile:v high -level:v 4.0 output.mp4 ffmpeg version 1.1 Copyright (c) 2000-2013 the FFmpeg developers built on Jul 18 2013 23:00:53 with Apple clang version 4.0 (tags/Apple/clang-421.0.60) (based on LLVM 3.1svn) libavutil 52. 13.100 / 52. 13.100 libavcodec 54. 86.100 / 54. 86.100 libavformat 54. 59.106 / 54. 59.106 libavdevice 54. (...)
• 19:53
  ffmpeg: preserve transparency when scaling png - Alexander Dyagilev Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to invoke the following command: ffmpeg -y -i 1.png -vf "thumbnail=300,scale='min(300,iw)':-1" -frames:v 1 o.png Input file: Output file: Is it possible to fix it? -- ,
• 18:58
  FFMPEG with php video compressing size [on hold] - matrix4583 Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to reduce the size of my video files with ffmpeg using php. However the code I use from the documentation is not working and little explanation on how to reduce the size. Here is the code I use.I tried to declare the video with $video = 'video.mp4';, but still no result. $video = 'video.mp4'; $ffmpeg = \\FFMpeg\\FFMpeg::create([ 'ffmpeg.binaries' => '/home//ffmpeg/ffmpeg', 'ffprobe.binaries' => '/home//ffmpeg/ffprobe' ]); $format = new FFMpeg\\Format\\Video\\X264(); $format->on('progress', function ($video, $format, $percentage) echo "$percentage % transcoded"; ); $format (...)
• 18:07
  ffmpeg extracted frames with zero indexed filename - RobertoBa Newest 'ffmpeg' Questions - Stack Overflow
  I'm using this command to extract all the frames from a video ffmpeg.exe -i video.mkv -qscale:v 2 -vf "transpose=2" "\\%10d.jpg" and I obtain all the jpg starting from 0000000001.jpg How can I make it start from 0000000000.jpg? Many thanks
• 17:04
  PS4 can not play h264 video - Alex Chiang Newest 'ffmpeg' Questions - Stack Overflow
  Summary PS4 Media player can not play h264 mkv, avi or mp4 movies which were converted from HEVC. According the sony's [docs], the media player could be. source video: HEVC audio: AC-3 converted video: H264 audio: AC-3
• 17:02
  How to properly close a FFmpeg stream and AVFormatContext without leaking memory? - Darkwonder Newest 'ffmpeg' Questions - Stack Overflow
  I have built an app which uses FFmpeg to connect to remote IP cameras in order to receive video and audio frames via RTSP 2.0. The app is built using XCode 10-11 and Objective-C with a custom FFmpeg build config. The architecture is the following: MyApp Document_0 RTSPContainerObject_0 RTSPObject_0 RTSPContainerObject_1 RTSPObject_1 ... Document_1 ... GOAL: After closing Document_0 no FFmpeg objects should be leaked. The closing process should stop-frame reading and destroy all objects which use FFmpeg. PROBLEM: Somehow Xcode's memory debugger shows two instances of MyApp. FACTS: (...) --
• 15:05
  Preprocessing of Columbia active speaker dataset - aspit794 Newest 'ffmpeg' Questions - Stack Overflow
  I would like to use the Columbia dataset (which is 1 video https://youtu.be/6GzxbrO0DHM) and its ground truth annotation (http://www.jaychakravarty.com/wp-content/uploads/2016/02/columbiaDatasetGroundTruth.zip). annotation contain the frame_id (int), x and y position of the bounding box (int, int), the width=height of the bounding box (int), and the ground truth for active speaker (0 or 1) More information: https://www.jaychakravarty.com/active-speaker-detection/ I managed to download the video, extracted the frames with ffmpeg -loglevel 0 -i columbia.mkv columbia/frame_%06d.jpg (...) -- https://youtu.be/6GzxbrO0DHM, http://www.jaychakravarty.com/wp-content/uploads/2016/02/columbiaDatasetGroundTruth.zip, https://www.jaychakravarty.com/active-speaker-detection/
• 13:56
  constructing an ffmpeg script for use in Xcode/swift project - NCrusher Newest 'ffmpeg' Questions - Stack Overflow
  I'm going back to the drawing board with this post because I've been through so much trial and error over the last day with this issue that the information I posted earlier is no longer relevant. I've only been learning both Swift and FFmpeg for a few weeks, and I've just exhausted my ability to troubleshoot this. I'm maybe 90% certain this is a problem with my ffmpeg script, rather than with the Swift component. But I think it's complicated by what characters need special formatting in Swift (particularly mathematical operatives.) I started off using a method in Xcode modeled after (...)
• 12:26
  java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "av_bsf_next" referenced by "/lib/arm/libffmpeg.so" - Sushrita Newest 'ffmpeg' Questions - Stack Overflow
  I have a third party library which has ffmpeg as dependency and i am getting this error while executing a thread. Process: com.joe.epmediademo, PID: 11906 java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "av_bsf_next" referenced by "/data/app/com.joe.epmediademo-U-buiUc64rYJquAlCAhK5A==/lib/arm/libffmpeg.so"... at java.lang.Runtime.loadLibrary0(Runtime.java:1016) at java.lang.System.loadLibrary(System.java:1657) at Jni.FFmpegCmd.(FFmpegCmd.java:24) at Jni.FFmpegCmd.exec(FFmpegCmd.java:73) at VideoHandle.EpEditor.execCmd(EpEditor.java:571) at (...) -- library
• 11:43
  How can I apply zoom in/out filter on specific frame in video using ffmpeg? - Axita Kathiriya Newest 'ffmpeg' Questions - Stack Overflow
  I want to apply zoom filter on specific frame on video using ffmpeg. for example, I want to make a slideshow of 5 images and each image will take 4-5 seconds for slide. I want zoom in/out effect on each image. So, i want to apply this effect at that time when particular image stay for 4-5 seconds. Please see this video link. I want same result like this using ffmpeg: https://youtu.be/nNTiyRDhlRY please refer first two slides of this link. -- https://youtu.be/nNTiyRDhlRY
• 10:28
  Unable to use ffprobe in fluent-ffmpeg - GJ. Newest 'ffmpeg' Questions - Stack Overflow
  I was intended to use ffprobe function to extract video information and here is my code: var FFmpeg = require('fluent-ffmpeg'); //... var convert_using_ffmpeg = function (source, target) var tempfile = path.join(config.tmproot, path.basename(target)); new FFmpeg( source: source ) .withVideoCodec('libx264') .withVideoBitrate('512') .withAudioQuality(5) .withAudioCodec('libmp3lame') .withSize('360x288') //.ffprobe(function(err,data) // console.dir(data); //) .toFormat('flv') .on('error', function (err) console.log('An error occurred: ' + err.message); ) .saveToFile(tempfile, function () (...)
• 10:09
  ffmpeg not reading string correctly in Swift MacOS app - NCrusher Newest 'ffmpeg' Questions - Stack Overflow
  I'm so close to having a working app that does a simple audio conversion calling ffmpeg but I'm stuck on what appears to be the silliest error. in the Console, ffmpeg prints the following error when I try to run the conversion: "Unrecognized option 'c copy'. Error splitting the argument list: Option not found" Which is strange because that's not the argument I'm giving it. My method for producing the string it's getting its argument from is as follows: func conversionSelection() if inputFileUrl != nil let conversionChoice = conversionOptionsPopup.indexOfSelectedItem switch (...)
• 09:58
  How can I extract images from an MPTS video(which has 4 videos in it) from each and every video using a single command? - geo-freak Newest 'ffmpeg' Questions - Stack Overflow
  I have an MPTS video file, which has 4 videos in it. I want to extract images from each video and store them in a directory separately. I am using ffmpeg, I have seen references from previous solved questions. I used below command to extract frames. ffmpeg -threads 8 -i input.ts -s 400x222 -qscale:v 4 -start_number 0 -vf fps=1 /storage/frames/input_1//%d.jpg /storage/frames/input_2//%d.jpg /storage/frames/input_3//%d.jpg /storage/frames/input_4//%d.jpg But frames extracted only for first video in MPTS stream. How can I achieve using this using a single ffmpeg (...)
• 08:52
  OCI runtime exec failed: exec failed: (...) executable file not found in $PATH": unknown - Uğur Kaya Newest 'ffmpeg' Questions - Stack Overflow
  I have dockerized an app which has ffmpeg installed in it via libav-tools. The app launches without problem, yet the problem occured when fluent-ffmpeg npm module tried to execute ffmpeg command, which was not found. When I wanted to check the version of the ffmpeg and the linux distro set up in the image, I used sudo docker exec -it c44f29d30753 "lsb_release -a" command, but it gave the following error: OCI runtime exec failed: exec failed: container_linux.go:296: starting container process caused "exec: \\"lsb_release -a\\": executable file not found in $PATH": unknown Then I realized (...)
• 08:05
  FFMPEG command is not Working in Android Q - SAVALIYA REENA Newest 'ffmpeg' Questions - Stack Overflow
  I am using the FFMPEG library to get a watermark stamp on video. It is working like charm in all versions excepts Android 10, It gives me below exception. E/FFmpeg: Exception while trying to run: [Ljava.lang.java.io.IOException: Cannot "/data/user/0/com.videowatermark.addtextandtimestampongalleryvideos/files/ffmpeg": error=13, Permission denied Caused by: java.io.IOException: error=13, Permission denied at java.lang.UNIXProcess.forkAndExec(Native Method) at java.lang.UNIXProcess.(UNIXProcess.java:133) at java.lang.ProcessImpl.start(ProcessImpl.java:141) at (...)
• 07:51
  PS4 can not play h264 vedio - Alex Chiang Newest 'ffmpeg' Questions - Stack Overflow
  Summary PS4 Media player can not play h264 mkv, avi or mp4 movies which were converted from HEVC. According the sony's [docs], the media player could be. source video: HEVC audio: AC-3 converted video: H264 audio: AC-3
• 07:22
  Why is there a difference between gpu frame extracting and CPU frame extracting using ffmpeg？ - corner Newest 'ffmpeg' Questions - Stack Overflow
  I used ffmpeg for gpu frame extraction, but it was different from CPU frame extraction. gpu frame extraction command: ffmpeg -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i video.mp4 -q:v 2 -vf "scale_npp=format=yuv420p,fps=25,hwdownload,format=yuv420p" -pix_fmt yuvj420p -y images/%5d.jpg cpu frame extraction command: ffmpeg -threads 1 -i video.mp4 -q:v 2 -vf fps=25 -y images/%5d.jpg But the results are different? why?
• 05:50
  Prevent FFmpeg from closing when a named pipe has been read completely - Werther Berselli Newest 'ffmpeg' Questions - Stack Overflow
  I'm doing a C++ application for a university project that takes a video file (e.g. matroska) and using FFmpeg (embedding commands inside std::system() instructions) apply these steps: Extract chunks of frames (e.g. 10 seconds per chunk) and chunks of .aac audio Apply some filters to frames Encode video chunk and audio chunk with x264 and send it to a listening client using RTSP. This step is achieved using two named pipes, one for video and one for audio. Receive the stream into another process and play it using ffplay (on localhost or lan). I need to divide my stream in chunks (...)
• 05:45
  Extracting each individual frame from an H264 stream for real-time analysis with OpenCV - exclmtnpt Newest 'ffmpeg' Questions - Stack Overflow
  Problem Outline I have an h264 real-time video stream (I'll call this "the stream") being captured in Process1. My goal is to extract each frame from the stream as it comes through and use Process2 to analyze it with OpenCV. (Process1 is nodejs, Process2 is Python) Things I've tried, and their failure modes: Send the stream directly from one Process1 to Process2 over a named fifo pipe: I succeeded in directing the stream from Process1 into the pipe. However, in Process2 (which is Python) I could not (a) extract individual frames from the stream, and (b) convert any extracted data from (...)
• 03:53
  How to convert ffmpeg video frame to YUV444? - Edward Severinsen Newest 'ffmpeg' Questions - Stack Overflow
  I have been following a tutorial on how to use ffmpeg and SDL to make a simple video player with no audio (yet). While looking through the tutorial I realized it was out of date and many of the functions it used, for both ffmpeg and SDL, were deprecated. So I searched for an up-to-date solution and found a stackoverflow question answer that completed what the tutorial was missing. However, it uses YUV420 which is of low quality. I want to implement YUV444 and after studying chroma-subsampling for a bit and looking at the different formats for YUV am confused as to how to implement it. (...) -- tutorial, ffmpeg, , wikimedia.org
• 01:19
  FFMPEG: Set output res and bitrate depending upon input video - Jegschemesch Newest 'ffmpeg' Questions - Stack Overflow
  I'm processing user videos with differing aspect ratios. It seems FFMPEG only allows you to specify a fixed resolution. I want the output res to be appropriate for the input res. Similarly, I'd like FFMPEG to intelligently set the output bitrate based on the input video: obviously it shouldn't be any bigger than the input. I can get the properties of a video with, ffmpeg -i example.flv But this requires some ugly parsing of the output, so I'm wondering if FFMPEG or some other tool has a more direct facility. Basically, I have the Youtube problem: crap comes in, reasonably uniform (...)
• 00:39
  Is there any way to change subtitle font in an mkv file in batches? - Sadao Maou Newest 'ffmpeg' Questions - Stack Overflow
  I have been using aegis subs till now but i need to do it in batches. Is there any way to do it in batch from ffmpeg or some cli?