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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2
votes
3answers
123 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 ...
2
votes
1answer
287 views

restart encoding with ffmpeg when bad source

I have an ffmpeg process which saves a stream from wowza server, but when the stream in wowza is interrupted for a second or so sometimes ffmpeg cycles in: [segment @ 0x671a10] st:0 PTS: 9600015 DTS: ...
0
votes
0answers
12 views

HEVC binary to MPEG 2TS

I'm trying to convert a HEVC bit stream to MPEG-2 TS using ffmpeg. However I can't seem to perform the task without a wrapper such as mp4. Here is the command I was trying. ffmpeg -i ...
2
votes
1answer
46 views

Lossy output with FFMPEG JPEG 2000

I'm trying to achieve a lossy JPEG 2000 output with FFMPEG, but no success so far. Using this command line: ffmpeg -i input.dpx -pix_fmt yuv420p -vcodec libopenjpeg output.jp2 As a result I get ...
9
votes
1answer
19k views

How can I crop a video with ffmpeg?

I have an MP4 file of a screen recording that I need to crop down. How can I accomplish this without using expensive tools like Adobe Premier or Final Cut? I prefer ffmpeg because I have used it ...
0
votes
1answer
152 views

How to keep audio and video in sync?

I have a few videos I have to convert for a website. They are PowerPoint slides with a narration track over top. The originals I have to work with are in m4v format. I have converted them to mp4 and ...
0
votes
0answers
18 views

ffmpeg libx264 not working

have Installed ffmpeg and x264 based on this post : http://stackoverflow.com/questions/9764740/unknown-encoder-libx264 no errors receved. but when i want to convert an input stream from mumudvb to a ...
3
votes
2answers
58 views

drop similar frames

I'd like to record a very long video from webcam which will be mostly the same. I'd like to drop intermediate frames that are very similar to each other to save on filesize and also make it easier to ...
2
votes
1answer
509 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 ...
2
votes
1answer
51 views

Unable to concatenate videos due to identical MOOV atoms

I am cutting out segments from a long mp4 file and then rejoining parts of them. However, since FFMPEG apparently keeps the same MOOV atom for the trimmed files as the original, it looks to FFMPEG ...
0
votes
2answers
36 views

Transcoding during ffmpeg overlay

My question is related to the technicality behind video overlaying. When a 3D object or an image is added to a video sequence as an overlay to render, does ffmpeg fully decode the original sequence to ...
1
vote
0answers
54 views

How to transcode mkv media into different resolutions with ffmpeg

I am trying to setup a server that allows me to broadcast a single media file using ffmpeg to a ffserver so that I can use the RTP protocol to allow clients to view the media at different resolutions ...
5
votes
2answers
1k views

OGV Format plays properly on my computer but transcoding drops (duplicate?) frames

I've made a set of screencasts using recordmydesktop on ubuntu 12.10. The output is an ogv file. When I watch the ogv file using the default movie player (totem) it looks fine - the audio and video ...
3
votes
2answers
451 views

How can I convert .MTS file (AVCHD) to .mp4 by ffmpeg without re-encoding H264 video stream?

Note: I posted same question to stackoverflow a short time before, when I have not found this comunity yet. I repost this since the question is more suitable to this community. 1. What I tried I ...
1
vote
1answer
119 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 ...
1
vote
1answer
46 views

Video for Windows Codec x264 and VP80

I'm looking for VfW codec to encode H264 and VP80. I already found: x264vfw And VP80vfw The 1st is bugged and lost the start and the end. The 2nd do not install on Windows 8. Why VfW ? to use ...
2
votes
2answers
47 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 ...
4
votes
0answers
60 views

Is it possible in FFMPEG to change scale over time?

Ok, so using the overlay filter, one can change the x/y location of a video over time by using the "t" variable. For example, overlay=x='if(gte(t,2), -w+(t-2)*20, NAN)':y=0 can be used to start ...
2
votes
1answer
84 views

Add an image in front of video using ffmpeg

I have many videos and I need to put an image in front of them for about 5 seconds, but adding it manually and rendering it each time would take really long, so I am asking if it is possible to do so ...
1
vote
2answers
257 views

How to demux MPTS to SPS

I have a live multi-program MPEG-TS stream [MPTS] over IP, I'd like to select just one program from the stream, and output a single-program MPEG-TS stream containing just that program. is there any ...
1
vote
1answer
204 views

FFMPEG convert video with multiple audio streams?

Ok so I have a video made from dxtory. The video is using dxtory video codec and unknown audio codec. When I pop the file into avimux, I can clearly see two audio tracks/sources. I have successfully ...
1
vote
2answers
56 views

FFmpeg encod set of time stamped images as Iframes

I have a set of images that are in time stamped order ( the unit is seconds ) but not in a set interval 012.png 017.png 024.png etc. How can I encode them so that each image is an Iframe at that ...
0
votes
2answers
3k views

Typical size of one hour long mp4 video

What is the typical size of a mp4 video, size 1280x720 encoded by ffmpeg libx264, and lasts for one hour? Currently my file is around 700Mb, is it too much?
1
vote
1answer
40 views

FFmpeg clarification “position of frame”

Sample output [Parsed_showinfo_0 @ 0x7f9a3b600000] n:0 pts:0 pts_time:0 pos:194408 fmt:yuvj420p sar:0/1 s:1920x1080 i:P iskey:1 type:I checksum:072007CF plane_checksum:[AAFB805D 153EE2B8 65C9A49C] ...
0
votes
1answer
588 views

Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

ffmpeg -i test.mp4 -acodec libvorbis -vcodec libvpx out.webm ffmpeg version N-57647-g1880294 Copyright (c) 2000-2013 the FFmpeg developers built on Oct 30 2013 19:25:44 with gcc 4.4.7 (GCC) ...
1
vote
2answers
80 views

Why does quality degrade so much if just cutting video with ffmpeg?

I have tried to cut video with the following command ffmpeg -i "Вспомнить все (Total Recall, 1990).avi" -ss 01:07:29 -to 01:08:05 fight.avi Output: Input #0, avi, from '╨Т╤Б╨┐╨╛╨╝╨╜╨╕╤В╤М ╨▓╤Б╨╡ ...
2
votes
1answer
19 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 ...
1
vote
2answers
71 views

ffprobe - why total bitrate is greater than sum of video and audio bitrates?

I have been working on video conversion. So, to find out video parameters I used ffprobe. However, when I run the command on an mp4 video file, I observe this: Total bitrate: 3547 Kb/s Video ...
1
vote
1answer
55 views

How can I convert large jpgs (15000 x 10840px) to video?

Whenever I try the command ffmpeg -y -r 1 -i File01.jpg -c:v libx264 -tune stillimage -pix_fmt yuv420p out.mp4 I get the failing result: [swcaler @ 000000000347fe0] deprecated pixel format used, ...
2
votes
1answer
62 views

Output file longer than source with ffmpeg

I'm producing several versions of a clip (320x180 24 fps and aprox 2Mbps) compressed with h.264 with ffmpeg using Avanti. Each version has different framerate. The video output has a slightly ...
2
votes
3answers
133 views

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?
3
votes
2answers
183 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 ...
1
vote
2answers
151 views

Why does FFMPEG fail when converting Intervalometer photos into a time lapse movie?

I loaded CHDK firmware on my old Canon IXUS 980IS and took 796 images, each weighing in at: JPEG 4416x3312 4416x3312+0+0 8-bit sRGB 9.182MB 0.050u 0:00.049 So I want to convert 796 images into a ...
1
vote
0answers
42 views

ffmpeg-php with fixed width and height and without stretch or squish

Hi there I googled for hours but no success to solve... This code works for me exec("ffmpeg -i $SourcePath -ar 22050 -ab 32 -f wemp -vf scale=500x400,setdar=16:9 $uploadpath1 2>&1"); but ...
1
vote
2answers
678 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 ...
0
votes
1answer
579 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 ...
1
vote
2answers
265 views

remove black frames from vob files with ffmpeg

I have a few .vob files with "black frames" (it seems that an issue during the acquisition from VHS did that). I can get where these black frames occur with the command ffmpeg -i source.vob -vf ...
2
votes
1answer
51 views

Reduce quality percentage wise

I have several movie files in a mkv container. ffmpeg -i filename gives me the following output: Stream #0.0(eng): Video: h264 (High), yuv420p, 1280x720, PAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k ...
0
votes
0answers
34 views

Putting a Lower bitrate of my video stream in my current mp4 container

Sorry if my question is too noobish, this is my first question. What I have is: An mp4 movie with a video stream and an audio stream. What I want in the output: Is an mp4 file containing: the same ...
0
votes
0answers
65 views

ffmpeg capture audio in raw format

I would like to capture audio with ffmpeg in .raw format. Here is what I do to capture in .mp3 format : ffmpeg -f dshow -t 10 -i audio="virtual-audio-capturer" -y "sound.mp3" note that I don't want ...
1
vote
1answer
158 views

How to get a crisp, exact color match for lossless screen-cast?

Background Recording a screen-cast (no audio) in Xubuntu Linux. The following image shows a side-by-side comparison of the video (left) versus the desktop (right): The screen-cast is recorded ...
2
votes
1answer
805 views

How to concatenate clips from the same video with ffmpeg

I have a long video with different scenes in it. I want to extract and concatenate 2 scenes from the video (that do not start on an I-frame) using ffmpeg 2.1.4. For argument, say I want 5 seconds ...
4
votes
1answer
1k views

How do I change frame size, preserving width (using ffmpeg)?

I'm new to this StackExchange site, and to using the ffmpeg encoder. I have a video that is 720x480 (3:2) that I would like to change to 720x406 (16:9) to match the other videos I have for a site. I ...
0
votes
0answers
24 views

Converting container or transcode movies to iPhone from command line (os x)

Over the years I collected many movies in different container formats (avi, mp4, mkv) and encoded with different codecs too. Now want convert containers (or transcode them if absolutely necessary) to ...
0
votes
0answers
37 views

ffmpeg output does not play

I'm trying to transcode an uncompressed AVI ~27GB in size to an MP4. I'm using the following command: ffmpeg -i input.avi -c:v libx264 -preset slow -crf 20 -c:a copy output.mp4 The resultant MP4 ...
1
vote
0answers
38 views

Set ipad compatible thumbs for mp4 videos based on a frame of the video with command line

I have a directory of 100 mp4 files. All are working well on my ipad but most of them do not have a working thumb. I want to generate these thumbs with a command line command (on macosx) based on a ...
2
votes
1answer
58 views

disabling streams in quicktime movies with ffmpeg

In Quicktime pro you can turn off streams in movies, without deleting the stream. Is it possible to do this with a command line application like ffmpeg? I have a bunch of video files that were ...
1
vote
1answer
284 views

How to concatenate two mxf files with ffmpeg, preserving both audio channels?

I have mxf files which went over the 2G limit, so were split up in the camera to produce two mxf files. They have two audio streams, one from each mic, like this: Duration: 00:10:01.60, start: ...
3
votes
1answer
183 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 ...
5
votes
3answers
9k views

How can I use FFmpeg to lower the quality of H264 video but keep it in H264 format?

I'm a complete noob to video editing, so forgive me if I ask for something ridiculous. I'm getting video clips from a set top recorder box. The clips are AVI files: Resolution: 1920 x 1080 Frames ...