5 April

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

• 10:50
  ffmpeg recursive conversion with explanation - MTH Newest 'ffmpeg' Questions - Stack Overflow
  I am new to ffmpeg and am using it primarily to convert flac audio into aiff. I have looked at a few threads for recursive ffmpeg conversions but none explicitly explain what part of the command dictates recursion. My ideal outcome would be to create the batch script in a high level directory within my file-tree, and have it recurse through all subdir's converting '*.flac' to '%%-na.aiff'. Even better would be to create a copy of the directory the files are in appending "-AIFF" to the directory name and placing the converted files there. (...)
• 10:33
  Run image top to bottom multiple photos - Monso Newest 'ffmpeg' Questions - Stack Overflow
  I have many photos, and want to run from top to bottom EX: 1.jpg 2.jpg 3.jpg 4.jpg 5.jpg ...... I can not run many images, in the code below running from bottom to top, helps me fix code to run multiple images, running from top to bottom . Thank you for taking time for me MyCode: ffmpeg -y -f lavfi -i color=s=900x360:d=60:r=30 -i "a/%%1d.jpg" -i 2.mp3 -i logo.png -filter_complex "[1:v]scale=900:-1[fg]; [0:v][fg]overlay=y='min(-h+main_h+(h-main_h)*t/60, 0)':shortest=1[gg]; [gg][3:v]overlay=10:main_h-h-10[gh]" -shortest -map (...)
• 10:50
  FFMPEG combining MP4 videos with same encoding not working, only showing first video - Ayudh Newest 'ffmpeg' Questions - Stack Overflow
  My mp4 videos have the same encoding: h264 I know because I ran this command on them: ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 a.mp4 Now I combine them using the following command: ffmpeg -loglevel quiet -f concat -safe 0 -i video-list.txt -c copy video-final.mp4 my video-list.txt file looks like this: file 'a.mp4' file 'b.mp4' file 'c.mp4' Now the video-final.mp4 which is the combined video actually has (...)
• 06:43
  Why does this ffmpeg,exe window keep opening when I run my command? - John Newest 'ffmpeg' Questions - Stack Overflow
  I'm making a discord bot and for this aspect of the bot, I wanted it to play music in the voice channel. Here is my code for it: ⓐclient.command(pass_context=True) async def play(ctx, url: str): song_there = os.path.isfile("song.mp3") try: if song_there: os.remove("song.mp3") print("Removed old song file") except PermissionError: await ctx.send("`There's already a song playing, request your song after!`") return await ctx.send("`Getting your song ready...`") voice = get(client.voice_clients, (...) -- https://imgur.com/a/iRr0qwj
• 06:31
  fluent-ffmpeg How to make video rendering synchronous with code? - wongz Newest 'ffmpeg' Questions - Stack Overflow
  I want to make the code run only after ffmpeg has finished rendering the videos. Currently, the code runs faster than the videos can render. videos.forEach((vid, i) => ffmpeg(`$process.cwd()/video/tmp/$vid`) .outputOptions(['-r 30', '-filter:v scale=w=720:h=1280', '-crf 20']) .save(`$process.cwd()/video/tmp/$vid`) .on('end', ()=> console.log(`Video $i rendered`)); ); console.log("Fully Completed"); The console shows: Fully Completed Video 0 rendered Video 1 rendered  (...)
• 06:17
  Efficient and Perfect way to extract frames from a large size video using python or ffmpeg according the timecode given - Yong En Newest 'ffmpeg' Questions - Stack Overflow
  let's say I have a video from youtube with at least 600 MB. The video is used for annotation where I have the annotated information in another text file. The annotation file has the timecode in millisecond (SSSS.ss). What I am trying to do is going into the timecode on the video and getting out the frames within the this period (TWO timecodes). There are TWO approaches that I used with different tools, one is using openCV in python and FFmpeg in bash script: I would stick with few variables here, fps = 25 timecode (after convert into second) = 333.44 to (...)
• 05:52
  Stream voice from Android's micro to RTMP server using FFMPEG - user2258282 Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to mix audios from Android's microphone and a mp3 file in storage and stream to a RTMP server using FFMPEG Now, I could stream a single mp3 file to RTMP server by the below command ffmpeg -i -acodec libmp3lame -ab 128k -ac 2 -ar 44100 -f flv rtmp:// And, I could stream audio from Mac's microphone to RTMP server by the below command ffmpeg -f avfoundation -i ":0" -f flv rtmp:// But now I haven't found command to mix audios from Android's microphone and a mp3 file in storage and stream to a RTMP (...)
• 05:13
  Generate video containing scrolling multiple image - Monso Newest 'ffmpeg' Questions - Stack Overflow
  I want to generate a video [let's say 800x600] from a 800x10000,1600x900,1920x1080 still image. this is my picture enter image description here I have some 800x11000 photos how to let it scroll to an end and to another I have a lot of pictures example 1.jpg 2.jpg 3.jpg 4.jpg 5.jpg .... I want it to scroll all the way inside the image folder. My code does not work . Thanks for your time! My Code: ffmpeg -y -i "a/%%1d.jpg" -vf "scroll=vertical=-0.9997,crop=iw:600:0:0,format=yuv420p" (...) -- enter image description here
• 05:12
  Retrieve h.264 frame as byte slice from MP4 file in Golang - MikolajMGT Newest 'ffmpeg' Questions - Stack Overflow
  I'm looking for some library or tool to retrieve next frames from MP4 file in H.264 format in Golang as binary data (streaming server purposes). I was looking at GoCv and GoAv, but from what I know GoCv allows only save frames directly to file (not to bytes in memory), in GoAv I also havn't found any method to do it (or maybe I am missing something?) I would be grateful to point any library which allows to do that. Greetings
• 03:08
  OpenCV VideoWriter produces "can't find starting number" error - user3325139 Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to write 16-bit grayscale video using the FFV1 codec and opencv.ImageWriter on Windows 10 Here is my code: import numpy as np import cv2, pdb print(cv2.getBuildInformation()) def to8(img): return (img/256).astype('uint8') cap = cv2.VideoCapture(0+cv2.CAP_DSHOW) cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter_fourcc('Y','1','6',' ')) cap.set(cv2.CAP_PROP_CONVERT_RGB, False) out = cv2.VideoWriter('out.avi', (...) -- https://pastebin.com/whtF6ixG
• 02:39
  ffmpeg - whatsapp: video format not supported - Santhosh Yedidi Newest 'ffmpeg' Questions - Stack Overflow
  I have two videos (.mp4) files. One uploads to whatsapp and another does not. Using ffmpeg I checked their properties: a) Properties of video which uploads: Duration: 00:00:56.45, start: 0.148000, bitrate: 1404 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1080, 1359 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(eng): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 47 kb/s (default) Metadata: handler_name : (...) -- https://drive.google.com/open?id=0B4UM6vTHw4pyMExQQ1lxZGp0N2c
• 02:10
  creating a modern nodejs video rendering app (ffmpeg microservice / cloud hosting) - Martin Newest 'ffmpeg' Questions - Stack Overflow
  I'm thinking of making a nodejs website like tunestotube.com or audioship.io that will: accept an audio file / image file input render a video using ffmpeg upload that video to youtube I just have a question on the best way to go about doing this, I want to host over GCP eventually, and am thinking about the best / most efficient way to handle the ffmpeg video rendering, since I want it to be scaleable and have a load balancer (ingress?) queue to handle getting multiple requests at once. Would it make sense to containerize my web (...)

4 April

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

• 21:40
  How to skip a bad frame when encoding images to a video - Andrew Simpson Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg on raspberry pi to encode jpegs to an avi file. During testing i found sometimes the video is not produced. The error I see is that it stops on a file that ‘cannot be opened’. However, I can open it manually and view ok in an image viewer. But I will be happy if that file is just skipped and the video is created with the images it is happy with. Is there a flag/switch I can use to skip ‘bad’ images? This is my command line: ffmpeg -y -framerate 10 -i %06d.jpg (...)
• 20:35
  How can ffmpeg scale videos to the same size, preserving their aspect ratio? - GreenTriangle Newest 'ffmpeg' Questions - Stack Overflow
  (I have searched similar questions and haven't found anything that works the way I describe here.) I have a number of videos of varying sample and display aspect ratios(and different framerates and timebases). I want to concatenate them into one long video, like a playlist, which means re-encoding them. I want them to scale up or down to fit within the desired output size (768x432), preserving their aspect ratio by pillarboxing when necessary. I've tried -vf scale=768:432:force_original_aspect_ratio=decrease,pad=768:432:(ow-iw)/2:(oh-ih)/2, which produces a (...)
• 20:13
  ffmpeg mp4 video cannot be played in old tv - Rick Brian Newest 'ffmpeg' Questions - Stack Overflow
  I've convert many video to mp4 using ffmpeg and playing well on my TV. But ever since I change my laptop to a new one, my conversion failed to load on the TV. I have tried to download old-stable ffmpeg Windows build, I tried also download a win-32 build, no good. (I'm using x64 laptop with Windows 10 64-bit, just the same like previous laptop) I also tried to add -pix_fmt yuv420p, still no good. This is code that I used to convert using ffmpeg: ffmpeg -f concat -i "D:\\Convert\\LISTCAM.TXT" -c:v libx264 -c:a aac -pix_fmt yuv420p "Apr (...)
• 20:13
  Collect AVFrames into buffer - mgukov Newest 'ffmpeg' Questions - Stack Overflow
  I'm collect AVFrames into array and then free them but this causes memory leak. extern "C" #include #include #include #include AVFrame * createFrame() int width = 1280; int height = 720; AVPixelFormat format = AV_PIX_FMT_YUV420P; int buffer_size = av_image_get_buffer_size(format, width, height, 1); uint8_t * buffer = (uint8_t *)av_malloc(buffer_size * sizeof(uint8_t)); memset(buffer, 1, buffer_size); uint8_t *src_buf[4]; int src_linesize[4]; av_image_fill_arrays(src_buf, src_linesize, (...)
• 20:11
  mergeToFile returns null - Andrew Roberts Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to use fluent ffmpeg to merge a bunch of audio files into a single file, yet I keep recieving an error that the output is null/ doesn't exist. My code: var ffmpeg = require("fluent-ffmpeg"); var command = ffmpeg(); for (var inputPath of filePaths) command.addInput(inputPath); console.log("Added path:" + inputPath); command .on('error', (err) => console.log('An error occurred: ' + err.message); ) .on('end', () => console.log('Merging finished !');  (...)
• 19:59
  mkv (multiple audio and subtittles) to hls - guga Newest 'ffmpeg' Questions - Stack Overflow
  On windows10 how to convert an mkv file to be streamed in hls (packets) ? I have a mkv containing a) Video in mp4 format (encoded with h264) to be used in several different resolutions 640x480, 960x720 etc b) 2 or more audio tracks (encoded as mp3 format) (The output can be in aac or mp3 work as well on streamings ?) c) 2 or more subtitles (built with srt or WebVTT format) The desired output format is webvtt I would like to create a playlist in m3u8 containing several small pieces (something around 256 kb each) of .ts file that can (...) -- https://kipalog.com/posts/FFMPEG-HLS-STREAM-MULTIPLE-AUDIO-SUBTITLES, https://www.martin-riedl.de/2018/08/
• 19:19
  Convert image and audio in background to Video file in React Native - Foram Trada Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to convert the images to video with audio in the background in React Native. I had used ffmpeg but I am not getting the expected result. https://www.npmjs.com/package/react-native-ffmpeg Here is the code that I had tried! RNFFmpeg.execute('-i http://192.168.43.4/ReactFirstProject/images/song.jpeg -i http://192.168.43.4/ReactFirstProject/screens/music/frog.wav -c:v mpeg4 output.mp4').then(result => (console.log("RESULT:",result))) Can anyone suggest any other libraries for doing the same? Please help me out. I would be (...) -- https://www.npmjs.com/package/react-native-ffmpeg
• 18:44
  ffmpeg audio encoder frame size - Jim Rhodes Newest 'ffmpeg' Questions - Stack Overflow
  I need to convert audio data from AV_CODEC_ID_PCM_S16LE to AV_CODEC_ID_PCM_ALAW and I am using this code as an example. The example code does essentially this (error checking omitted for brevity): const AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_MP2); AVCodecContext* c = avcodec_alloc_context3(codec); c->bit_rate = 64000; c->sample_fmt = AV_SAMPLE_FMT_S16; c->sample_rate = select_sample_rate(codec); c->channel_layout = select_channel_layout(codec); c->channels = av_get_channel_layout_nb_channels(c->channel_layout); avcodec_open2(c, codec, (...) -- this
• 17:26
  Unable to run command through Java, but can run it through cmd CreateProcess error=2, The system cannot find the file specified - Al G Johnston Newest 'ffmpeg' Questions - Stack Overflow
  I am unable to convert my mp3s to wavs for easier data manipulation using Java. I can open a command prompt and copy the exact string stored in s when I debug and this will properly create the wav file. The code is below. I was able to use ffmpeg by building strings this way to split up a few mp3s into separate tracks based on a tracklist. I reinstalled Windows 10, so I'm assuming it has something to do with that. Is there a setting I have to change? Why would it run in the command prompt, but not with Java? package mp3towav; import java.io.File; import (...)
• 17:13
  ffmpeg override output file if exists - Muhammad Omer Aslam Newest 'ffmpeg' Questions - Stack Overflow
  I am creating a clip from an audio file .FLAC with a start and end time, here is my command. ffmpeg -i /audio/191079007530_1_01.flac -t 51 -ss 69 /clips/44z274v23303t264y2z2s2s2746454t234_clip.mp3 2>&1 >> /ffmpegLogs.log I use this command with my PHP code and my question is, When i run the above command on the console it asks me to override the output file if the output file already exists in the destination, what switch or extra command should I use to automatically override if the file (...)
• 15:04
  Could not find codec parameters for stream 0 (Video: hevc, none): unspecified size - bzc0fq Newest 'ffmpeg' Questions - Stack Overflow
  I try to use ffmpeg to feed ffserver on CENTOS 6.10. When I run ffmpeg on stream I got an error message: Could not find codec parameters for stream 0 (Video: h264, none): unspecified size. The full ffmpeg output is here: [rootⓐstone1 ~]# ffmpeg -i rtsp://user44:xxxⓐ192.168.101.108:554/0 -y http://192.168.101.1:8090/feed2.ffm ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16) configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg (...) --
• 14:50
  ffmpeg fluent invalid frame size mp3 - Andrew Roberts Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to merge mp3 files in fluent-ffmpeg after recording it on my phone and sending it to a node js 8 server yet I keep recieving an error: [mp3 ⓐ 0x2a4cdff86c80] Format mp3 detected only with low score of 1, misdetection possible! [mp3 ⓐ 0x2a4cdff86c80] Failed to read frame size: Could not seek to 1026. /tmp/audio2208.mp3: Invalid argument at ChildProcess. (/srv/node_modules/fluent-ffmpeg/lib/ffprobe.js:233:22) at emitTwo (events.js:126:13) at ChildProcess.emit (events.js:214:7) at (...)
• 14:19
  FFMpeg doesnt insert sound to converted media files - In-my-country-we-dont-use-name Newest 'ffmpeg' Questions - Stack Overflow
  I am new at FFMpeg. I use this code to convert media files to WebM and MP4 formats: (It's php) // MP4 $video_mp4 = $output_name . '.mp4'; exec($ffmpeg . ' -i "' . $uploaded_file . '" -c:v libx264 -an "./converted/' . $video_mp4 . '" -y 1>convert.txt 2>&1', $output, $convert_status['mp4']); // Debug echo '' . print_r($output, 1) . ' '; // WebM $video_webm = $output_name . '.webm'; exec($ffmpeg . ' -i "' . $uploaded_file . (...)
• 16:16
  use ffmpeg to extract video frames with time code specified on the SRT file - Allen Newest 'ffmpeg' Questions - Stack Overflow
  Complete newbie on ffmpeg here. I have a video file and an SRT subtitle file. Is there any way I can have ffmpeg read the time code on the SRT and use that as an input parameter for ffmepg to specify exactly when to extract video frames? If this is too complex for ffmpeg, are there other approaches you can recommend to achieve what I am trying to do? Thank you guys in advance for your input. Allen
• 15:31
  FFMPEG for android in Windows not successfully compile - Mr X Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to compile FFMPEG for android in Windows 8.1 but i got error at 32 line in build_android.sh ./build_android.sh: line 32: syntax error: unexpected end of file when i execute command in cygwin chmod +x build_android.sh ./build_android.sh If you are knows steps to compile ffmpeg for android in windows and how to use ffmpeg in android then pleas reply me. I am referencing . http://www.packtpub.com/sites/default/files/downloads/Developing_Multimedia_Applications_with_NDK.pdf ,  (...) -- http://www.packtpub.com/sites/default/files/downloads/Developing_Multimedia_Applications_with_NDK.pdf, https://trac.ffmpeg.org/wiki/CompilationGuide/Android, http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9
• 15:16
  perspective correction example - alessandro Newest 'ffmpeg' Questions - Stack Overflow
  I have some videos taken of a display, with the camera not perfectly oriented, so that the result shows a strong trapezoidal effect. I know that there is a perspective filter in ffmpeg https://ffmpeg.org/ffmpeg-filters.html#perspective, but I'm too dumb to understand how it works from the docs - and I cannot find a single example. Somebody can show me how it works? -- https://ffmpeg.org/ffmpeg-filters.html#perspective
• 12:12
  getting video duration with ffmpeg, php function - keithp Newest 'ffmpeg' Questions - Stack Overflow
  I have FFMpeg installed and I know it's functional, but i'm trying to get the duration time from a flv video through PHP but when I use this code: function mbmGetFLVDuration($file) /* * Determine video duration with ffmpeg * ffmpeg should be installed on your server. */ //$time = 00:00:00.000 format $ffmpeg = "../ffmpeg/ffmpeg"; $time = exec("$ffmpeg -i $file 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//"); $duration = explode(":",$time); $duration_in_seconds = (...) -- http://www.videoaddsite.com/videos/intro.flv
• 12:00
  php-ffmpeg get video duration - swg1cor14 Newest 'ffmpeg' Questions - Stack Overflow
  When I try to get the duration of a video using the php-ffmpeg wrapper and ffprobe, I get a huge object instead of just the duration. $ffprobe = FFMpeg\\FFProbe::create(); $ffprobe->format($this->videoFile) ->get('duration'); $this->videoFile is /home/admin/........./5422346433.mp4 So it points to right file and the duration is listed in the giant object down in => Array ( [0] => FFMpeg\\FFProbe\\DataMapping\\Format Object ( [properties:FFMpeg\\FFProbe\\DataMapping\\AbstractData:private] => Array (  (...)
• 10:34
  Ffmpeg unsharp light - user13125448 Newest 'ffmpeg' Questions - Stack Overflow
  im trying to sharpen a video with unsharp like so ffmpeg -i video.mkv -c:v libx264 -vf unsharp,scale=1280:-2:flags=lanczos -pix_fmt yuv420p -c:a aac output.mkv But the unsharp filter applies sharpness too strong is there a setting for a more lighter sharpness something like watching a 1080p video but actually is 720p.
• 09:56
  Repl.it and FFmpeg - user12238231 Newest 'ffmpeg' Questions - Stack Overflow
  Hi I am building a discord bot and would like to use ffmpeg in it but am working on repl.it. How can I use ffmpeg on repl.it if I can? This is for translating a .webm file into an .mp4 file, running on python 3.7.4. I have had a look on the repl.it forums and on Stack Overflow but cannot find any information. Thanks! -- repl.it
• 07:11
  How can i build x264 and fdk-aac for android with ndk? - Pradeep Simba Newest 'ffmpeg' Questions - Stack Overflow
  How can i build x264 and fdk-aac for android with ndk? I build x264 and fdk-aac with ndk. But, it not done. I modified this build file and I build x264 and fdk-aac.But,it not done. How can I solve this? -- file
• 00:15
  How to calculate bitrate of lower resolution videos created from high resolution video? - Ryosuke Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to implement HLS video using ffmpeg. Suppose I have a video with following specs: 1080x1920 bitrate: 20971649 Now I have to write a command to convert it to for example: 720p. So now the actual converted video by ffmpeg has bitrate: 760808. Is there a way that I can know this bitrate before hand, so that I can include in the master playlist correctly?