FFmpeg is a free software project that produces libraries and programs for handling multimedia data. The most notable parts of FFmpeg are libavcodec, an audio/video codec library used by several other projects, libavformat, an audio/video container mux and demux library, and the ffmpeg command line ...

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FFMpeg Encoding and Core Usage

We have developed an application to transcode source .mov files into .ogg, .mp4 and .webm output. It is currently running on AWS EC2 instance g2.8xlarge. It is working (yay!). My question: Even ...
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11k views

encoding 4:2:2 in 10-bit with libx264

I believe that libx264 is now capable of doing 10-bit 4:2:2 encodings, but I can't seem to get it to work. I'm using ffmpeg (info below), and I've also tried the x264 encoder directly. I've tried ...
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2answers
128 views

ffmpeg bgr vs rgb and other similiar pixel formats

I was wondering about the difference between rgb and bgr pixel formats available in many codecs. It reminds me in some way the Big Endian and Little Endian flavours of computer processors. While I ...
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2answers
1k views

Add image under the video with ffmepg

I want to extend basic usage of watermark and put it under the video. That means. I have input video 720x480 and image 720x20. On output i want to have video 720x500 where video aspect is preserved ...
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2answers
3k views

How to hold the last frame when using ffmpeg

I'm cutting/converting some videos with ffmpeg. What I'd really like is to be able to have the output hold the last frame for a few seconds (with silence for audio). Is such a thing possible? Or ...
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3answers
684 views

h264 settings for large flat areas of slowly changing colour

I'm doing an animation for a projection mapping that simulates the sun casting shadows on a structure as it moves through the sky. Basically it's just big flat areas of colour that change over about ...
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1answer
3k views

What CRF or settings I should choose for h265 in order to achieve a similiar quality of h264?

I'm doing some experiments with HEVC x265. I have a raw footage and the quality of details of h264 with same CRF setting looks better than h265. Shouldn't be the opposite? Maybe my setup isn't the ...
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1answer
1k views

Video converted by FFMPEG has a different duration, why?

I convert videos using FFMPEG. My goal is to convert them to the MP4 container format (MPEG-4 Part 14) with AAC-encoded audio stream and MPEG-4 part 10-encoded video stream. I use the following line ...
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1answer
183 views

Is H.264 subject to exploits / are some H.264 codecs subject to exploits?

How safe are H.264 streams from exploits? More exactly, are the consumer-grade H.264 codes generally "safe"? I am currently gratuitously transcoding A/V files to avoid being exposed to possible ...
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1answer
504 views

ffmpeg input from images stream out video

I am using ffmpeg to capture a video recording device and would like to add an overlay to it . I have images being rendered on the fly and I would like to use them as the overlay . How can I take a ...
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1answer
30 views

How to calculate the length of the video file that was encoded so far?

I am using ffmpeg to convert a video file to H.264 format. If I call ffprobe while ffmpeg is still running the duration of the video is not known. Only when ffmpeg finishes the ffprobe will display ...
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1answer
1k views

convert horizontal side by side to vertically stacked 3D video

I have seen this and this post explaining how to crop and stack videos using ffmpeg. My question is - is there an easy (preferably one step) way to turn a horizontally stacked video into a vertically ...
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1answer
405 views

ffmpeg pixel format definitions

ffmpeg -pix_fmts lists many pixel formats. In my ffmpeg, there are 66 different pixel formats that start with yuv. A few of them are familiar to me (e.g., yuv422p), but most of them are not (e.g., ...
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1answer
101 views

FFMPEG standard transcoding settings

I am working on a project that provides video streaming to the users over the internet on web-browsers as well as mobile devices. I am using following sample FFMPEG command to transcode the video: ...
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1answer
205 views

FFmpeg pan filter and clipping

I have a file that has one video stream and one audio stream with 8 channels. I want to create a new file that will only contain the first 2 channels of the audio stream (no video). I can do this ...
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2answers
274 views

How can I set the first frame of a video to an I-frame and the rest to P-frames (preferably with ffmpeg)?

I'd like to try to do some datamoshing like this tutorial. But I'd like to be able to do it programatically, so instead of vdub and avidemux, I'd like to figure out how to do as many parts of this ...
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1answer
866 views

Correct lens distortion with ffmpeg

It seems to be possible to correct lens distortion with ffmpeg. According to the manual you can adjust K1 and K2 values. What this means? How to use it correctly? Example still image - captured with ...
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1answer
583 views

Creating stereoscopic video from two video files

I've got two video files, each created with ffmpeg from a series of JPEG images, which I've obtained from rendering with a stereo camera in Maya. I would like to somehow merge together these videos ...
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1answer
387 views

what graphics card features effect NVIDIA NVENC hardware encoding speed?

I have a web project I am working on that requires transcoding of multiple short video clips (6-10 seconds) uploaded by users into a web friendly H.264 format on my linux server. I have been able to ...
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1answer
207 views

ffmpeg: pillarbox 4:3 to 16:9

I'm confusing myself over how the video filters work, particularly how they work together, I think. I have two MKVs, pulled from DVD, that are respectively 16:9 and 4:3. What I would like to do is ...
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1answer
2k views

How to specify CRF quality settings for different encoding software

Is there a way of specifying a quality setting for h.264 that is not software dependant? I'm trying to help a colleague create a specification for outside contractors when they deliver video to us ...
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1answer
4k views

Video Capture using ffmpeg (V4L2 indev) Results in Bad A/V Sync

I actually contributed to a bug report on this issue a year and a half ago ( https://trac.ffmpeg.org/ticket/692#comment:15 ). Basically, the problem is that using ffmpeg to record from a USB video ...
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2answers
120 views

Why is this ffmpeg command outputting such long clips?

I am trying edit out a two minute clip from a long movie. This is the command I'm using: ffmpeg -ss 01:05:16 -t 120 -i input.avi -vcodec copy -an clips/output.avi I thought that 120 would be in ...
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1answer
124 views

How do I prevent Quality loss in the beginning of a video?

My company transcodes videos sent in by users (recorder by our own screenrecording software) I use FFMpeg to do the work using this command: /ffmpeg/ffmpeg -i in.mov -vcodec libx264 -fpre ...
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1answer
39 views

Video metadata: What is “Video delay” used for?

Recently, I'm forced to fiddle with a nasty little problem with videos that have some special metadata attributes, namely "delay" or "delay_relative_to_video". There's a software videoconferencing ...
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2answers
122 views

ffmpeg Multiple Audio Language and Soft- Subtitle

I'm trying to convert a movie, using ffmpeg, from Movie.mkv to Movie.m4v. The Movie has 2 Languages and 1 subtitle stream. Using ffmpeg -i inputMovie.mkv outputmovie.m4v the result is just one ...
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1answer
387 views

ffmpeg reducing 60fps to 30fps, but file size is larger

I just did: ffmpeg -i inputfile -r 30 -vcodec libx264 -an -s hd480 output_30.mp4 and ffmpeg -i inputfile -vcodec libx264 -an -s hd480 output_60.mp4 on a 60fps file. Why is the second file 27 MB ...
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228 views

Using ffmpeg to cut videos with more precision than key frames allow

I'm trying to cut a video (a debate on TV) with ffmpeg without re-encoding, and I need to cut between 2 sentences a guy pronounce. I think the precise moment is between two keyframes, because whatever ...
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1answer
207 views

Using h264 in loseless mode brings small unexpected results

I got curious on ffmpeg screen capture capabilities and started messing around with a simple realtime capture test in h264. ffmpeg -f dshow -i video="screen-capture-recorder" -video_size 1920x1080 ...
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357 views

Getting FFMPEG to stream video+audio through RTMP

Can someone help me with this : The video streams fine but I can't hear any audio. I just hear random click sounds.Please help : ffmpeg -f video4linux2 -channel 1 -i /dev/video0 -f alsa -i ...
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603 views

Merge two transparent webm videos with ffpeg

I'm trying to merge two transparent webm videos together while keeping their transparency using ffmpeg Main video: https://s3.amazonaws.com/medlike/logo.webm Overlay video: ...
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4answers
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ffmpeg: Normalize audio in an avi file

Ι have an avi file that has different levels of audio. Is there a way to decrease and increase appropriately where needed the audio of my file using ffmpeg?
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1answer
584 views

ffmpeg - video with timer

I am currently working with the drawtext and drawbox filters to recreate a similar video appearance to what is shown below in the image. I am trying to see of a possible ways to add a count down timer ...
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2answers
2k views

How to extract MOOV atom/metadata from MP4 file?

Can one "dump"/extract the MOOV atom from an MP4 file? If so, how? Hoping for an obscure FFMPEG command. I need to be able to process/play a stream without searching for the MOOV atom over and over ...
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2answers
979 views

YouTube 3gp encoding settings

I'm building a new media site and I'm taking cues from YouTube for which video file formats I should offer for widespread usability among mobile and desktop clients. I'm doing all transcoding using ...
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3answers
1k views

FFmpeg MP4 to FLV too slow

I am converting .mp4 files to .flv using ffmpeg in centos. But the conversion time is extremely too slow! It takes about 1.5 hours to convert 500MB .mp4 file into .flv. I am using a linux vps with 2 ...
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2answers
146 views

How is possible for YouTube and Vimeo transcode so fast?

For the bit I read YouTube and Vimeo rely on servers powered by some modified libs i guess like libavcodec and tools like ffmpeg in a serious custom build. Let's assume a transcode to h264 but the ...
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2answers
204 views

VOB editing with FFMPEG

I read that it is better to extract from vob H264 files within a .ts to have a lossless and more accurate sample, easy to cut, is that correct ? I used these commands : ffmpeg -i VTS_01_1.VOB ...
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2answers
945 views

Lossless conversion of yuv420p10le to yuv420p

I have an mp4 movie, containing an h264 video stream (pixel format yuv420p10le), and an AAC audio stream. My favorite player cannot read the yuv420p10le pixel format. I was wondering if it is ...
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1answer
5k views

FFmpeg overlaying and blending videos

I am trying to use FFmpeg to overlay one video on top of the other using an additive blend. One video is the actual video I want to transcode, the other is a ~10 second long video I want to put into ...
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1answer
164 views

How to convert video for viewing on Sony Ericsson C702?

I'd like to convert some of my videos for viewing them on Sony Ericsson C702 cell phone. But I couldn't find the right set of parameters (a/v codecs, container, etc.). I'd prefer a solution using ...
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1answer
2k views

What ffmpeg/avconv format and container will Adobe Premiere Pro accept, out-of-box?

All of these converted, but Premiere Pro only loads the audio. I use Ctrl-I to import the videos, and they come up as waveforms, and can only be placed on audio tracks. These examples use avconv, ...
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1answer
120 views

Convert resolution 4096x2304 to 3840x2160 keeping the quality the same

I have recently come into possession of a couple of 4k movies with a resolution of 4096x2304. Unfortunately my Samsung 4k TV wont play anything over 3840x2160. I have managed to re-encode the videos ...
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1answer
161 views

ffmpeg: white padding is light grey but not white

I want to generate 16:9 thumbnails from videos with white padding but the resulting picture has grey padding instead of white. This is the command line (input here is a jpg but the effect is the same ...
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1answer
240 views

Streamable Container for HEVC (H.265)

flv is a container which can be used to stream videos while they are being encoded. flv supports h.264 codec. However, flv doesn't support hevc codec. Is there any container for hevc which is ...
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1answer
124 views

Video with inconsistent exposed / rendered image sizes

I have an interlaced video with MTS file format, which was captured using a HD camera. When I play it using VLC, it is displayed at resolution 1920x1080 and if I take a snapshot with VLC, the saved ...
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2answers
310 views

avconv converting videos in really bad quality

I have this linux command line app called avcon. It is used to converting files. For instance if I have a file called video.mp4 I can run avconv -i video.mp4 video.ogg and it will convert this ...
2
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1answer
797 views

How to do mpeg/mpg to mov lossless convertion?

Does anyone know how to do lossless conversion from *.mpeg/mpg to mov? I was asked to extract video from DVDs and do editings in FCPX, however FCPX cannot edit *.mpeg/mpg file natively, therefore I ...
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1answer
115 views

ffmpeg framemd5 format explanation

Does a frame consist of audio and video or just video? I am trying to verify if this can be used for confirming both audio and video data were successfully sent or if I need to handle the audio ...
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2answers
5k views

How to do a video live stream through a VPS?

I've been looking at a million resources and I can't find a definitive answer to this. I'm looking to do a small scale (max 50 viewers possibly), low quality live video stream, with nothing but my ...