Media tool with support for multiple codecs, filters, and containers. Include the full, uncut console output if you have problems with an FFmpeg command.
19
votes
5answers
26k views
Using ffmpeg to cut up video
I am using ffmpeg to cut out a section of a large file like this:
ffmpeg -i input.wmv -ss 60 -t 60 -acodec copy -vcodec copy output.wmv
The -ss part works fine but the -t is ignored. It correctly ...
16
votes
1answer
8k views
FFMPEG Splitting MP4 with Same Quality
I have one large MP4 file. I am attempting to split it into smaller files.
ffmpeg -i largefile.mp4 -sameq -ss 00:00:00 -t 00:50:00 smallfile.mp4
I thought using -sameq would keep the same quality ...
15
votes
8answers
5k views
Program to convert flac to mp3?
I'm looking for a program to convert flac files to mp3, while preserving the embedded metadata (including album art).
I'm pretty sure this is possible with ffmpeg, but I don't know the command . . .
...
14
votes
4answers
8k views
How can I make ffmpeg be quieter/less verbose?
By default ffmpeg sends a whole lotta messages to stderr: when built, how built, codecs, etc, etc, etc.
How can I make it quieter?
I've tried -v 0 (and -v 10 since the documentation just coyly says ...
13
votes
1answer
3k views
What is the “sameq” or “same_quant” option in FFmpeg? Does it mean “same quality”?
Often, I've seen FFmpeg commands using the sameq option, for example
ffmpeg -i input.mp4 -sameq output.avi
What does this mean? Does it mean "same quality"? If not, what should I use instead?
12
votes
2answers
12k views
Converting FLV to MP4 Using FFMPEG and Preserving the Quality
Im trying to use ffmpeg to convert my flv files to mp4 to play them on iOS devices but the converted video has a much worse quality than the original one.
Here is the command i use:
ffmpeg -i ...
12
votes
3answers
4k views
Improve quality of ffmpeg created jpgs
I'm using ffmpeg to take a mjpeg feed from an IP camera and convert it into a series of still jpeg images. Here's the command I'm using:
ffmpeg -i http://xxx:xxx@xx.xx.xx.xx/vid.mjpg -f image2 ...
12
votes
4answers
4k views
Creating video with audio and still image for YouTube
I'm running the following command:
ffmpeg -i audio.mp3 -ar 44100 -f image2 -i logo.jpg -r 15 -b 1800 -s 640x480 foo.mov
Which successfully outputs a video with my recorded audio and an image on it.
...
10
votes
2answers
17k views
How can I convert MP4 video to MP3 audio with ffmpeg?
I need to extract an MP3 audio track from an MP4 video with ffmpeg. I can do this for .flv -> mp3, but I don't know the command line parameters for mp4->mp3. For example, flv -> mp3:
ffmpeg -i ...
10
votes
2answers
8k views
How can I normalize audio using ffmpeg?
I want the loudest peak sound in a movie clip to be as loud as the codec allows, then have every other sound amplified accordingly.
What's a practical example in order to accomplish this using ...
9
votes
1answer
3k views
How can I get ffmpeg to convert a .mov to a .gif?
I'm trying to convert a .mov to a .gif and I'm not having success.
Here's the error:
ffmpeg -pix_fmt rgb24 -i yesbuddy.mov output.gif
ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg ...
9
votes
7answers
15k views
How to convert video to images?
How can I convert a video file to a sequence of images, for example one frame every N seconds. Can mplayer or ffmpeg do this? I have used MPlayer to grab screenshots manually but I would like to ...
9
votes
2answers
6k views
Resize videos with different widths to a fixed height preserving aspect ratio with ffmpeg
I'd like to convert a lot of video files to flash video for our company's website. I have a requirement that all of the videos must be in 360p format, so their size would be Nx360.
FFMpeg uses -s ...
9
votes
3answers
4k views
How to concatenate two flv files?
I want to concatenate two flv files(downloaded from Youtube.com) by linux command line tools.
The ffmpeg tutorial is too complicated, so I tried the mencode tutorial.
But I get a empty output. I don't ...
8
votes
6answers
5k views
Get MP3 Length in Linux / FreeBSD
I have a bunch of mp3 files with various length. I want to cut it down to 50%-60% length. Says, from 1 minute down to 30 seconds. It should be trivial using ffmpeg. But, I don't know how to determine ...
7
votes
2answers
3k views
How to create an uncompressed AVI from a series of 1000's of PNG images using FFMPEG
How can I create an uncompressed AVI from a series of 1000's of PNG images using FFMPEG?
I used this command to convert an input.avi file to a series of PNG frames:
ffmpeg -y -i input.avi -an ...
7
votes
4answers
6k views
How can I pipe output of ffmpeg to ffplay?
How can I pipe the output of ffmpeg to ffplay?
At the moment I use a workaround in bash :
mkfifo spam
(ffplay spam 2> /dev/null &) ; capture /dev/stdout | ffmpeg -i - spam
7
votes
1answer
3k views
Convert audio file to FLAC with ffmpeg?
can I convert one of this format to compatible 16000.0 Sample Rate FLAC file?
kAudioFormatLinearPCM = 'lpcm',
kAudioFormatAppleIMA4 = 'ima4',
kAudioFormatMPEG4AAC ...
7
votes
4answers
3k views
How to convert 1080@50i -> 720@50p using ffmpeg?
I really like 50fps video, but I cannot make ffmpeg convert it to 50fps for me.
720p resolution is absolutely fine with me, just need more FPS.
50i just looks much smoother in proper players (for ...
7
votes
2answers
7k views
FFmpeg extract clip - stream frame rate differs from container frame rate (x264, aac)
Summary
H.264 video seems to have a really high frame rate that requires a scaling factor to the applied to the duration of video that I'm trying to extract (900x lower).
Body
I'm trying to extract a ...
7
votes
1answer
719 views
Meaningful thumbnails for a Video using FFmpeg
FFmpeg can capture images from videos that can be used as thumbnails to represent the video. Most common ways of doing that are captured in the FFmpeg Wiki.
But, I don't want to pick random frames at ...
6
votes
2answers
7k views
libav vs ffmpeg - better to use libav (avconv) today?
From what I've seen it looks to me like libav is thought to become a successor of ffmpeg, is that correct? If that's true why is that so? What exactly is libav doing better and why should I choose it ...
6
votes
3answers
7k views
Cut part from video file from start position to end position with FFmpeg
I have a video file of 30 minutes, but I want to extract a video from 00:09:23 to 00:25:33.
I can define the startposition with -ss, but I couldn't find one for the end position. Any help please?
6
votes
1answer
1k views
How to get length of video file from console?
Suppose we have video file some_video.
How to get length of it from a shell script (with mplayer/transcode/gstreamer/vlc/ffmpeg/whatever)?
VIDEO_LENGTH_IN_SECONDS=`ffmpeg .... -i some_video ... | ...
6
votes
2answers
6k views
How to use ffmpeg to add metadata to an AAC file without reencoding?
I'm using ffmpeg to extract just the audio stream from a video file:
ffmpeg -i video.mp4 -vn -acodec copy audio.aac
This produces a clean audio file but without any metadata.
To add metadata, ...
6
votes
2answers
5k views
Can FFMPEG capture from the screen in Windows?
I am trying to capture a certain region of the screen (actually its specifically a number of visible windows) on Windows XP with FFMPEG but I can only find options to capture from X11:
...
6
votes
2answers
2k views
DTS to AC3 conversion for LG TV using mediatomb DLNA server
I want to convert a MKV video file containing DTS audio to a stream with AC3 audio. I want to pass this resulting stream to mediatomb's transcoding feature. Mediatomb will transfer the stream via DLNA ...
6
votes
1answer
1k views
ffmpeg encoding on QuadCore
I am trying to push my server's CPU cores to the max, but no success.
Encoding 2-pass style, set my "-threads" to 128 . When running 2nd pass , the CPU seems to be at 98% usage, but first pass run ...
5
votes
3answers
2k views
Speedup a Video on linux
I dont want to use player like vlc to speedup the playback. I want to actually speedup playback in the original file.
Its like I want video to be played 2 times faster.
5
votes
5answers
3k views
Join Audio and Image -> Output as Video using FFmpeg
I have 1 image (jpg) and 1 audio file (MP3) and I would like to output this as a video file (say AVI for example).
Does anyone know how to use FFMPEG to join the two? I'd like to show the image for ...
5
votes
2answers
6k views
How to merge audio and video file in ffmpeg
I want to merge an audio file (.wav or .au format) with a video file (.mp4 format).
Please suggest me a open-source utility to achieve this. I want to merge these file to new .mp4 video file. An ...
5
votes
2answers
481 views
ffmpeg converts .flv video to .gif with awful quality
I'm converting .flv movie to .gif file with ffmpeg.
ffmpeg -i input.flv -ss 00:00:00.000 -pix_fmt rgb24 -r 10 -s 320x240 -t 00:00:10.000 output.gif
It works great, but output gif file has a very ...
5
votes
3answers
3k views
How can I re-encode H.264 video with minimal quality loss?
I have a lot of MPEG-TS files (.TS container but H.264 video) and playback is fine except that when you skip forward/backward or fast forward it's very sluggish and gets pixelated, etc.
I've been ...
5
votes
1answer
5k views
How to clip a movie from specified start time in ffmpeg?
I'm trying to clip some movie from time A to time B using ffmpeg.
I can set how long the target video should be using the -t flag, but how should I tell it to start that time from time A?
In other ...
4
votes
2answers
2k views
Strip metadata from all formats with FFmpeg
How can I remove all metadata from all formats via FFmpeg?
I can just set special metadata for each format per man ffmpeg. Any option or method to clear all metadata and strip media from all metadata ...
4
votes
3answers
5k views
Synchronizing audio and video using MP4Box / ffmpeg to concatenate files
I have two H.264 encoded MPEG-4 files that I need to concatenate. I have been using MP4Box for this task by first ensuring the files are encoded identically (even went so far as to compare output from ...
4
votes
1answer
1k views
Resources To Use FFMPEG Effectively
Lately i've posted a lot of questions about how to use ffmpeg. It's pretty clear to me that I am missing some sort background in video encoding and was wondering if any of my fellow superusers had ...
4
votes
2answers
2k views
4
votes
2answers
152 views
Drop every even or odd frames using FFmpeg?
Is there an accurate way to take raw video and extract from it a new video that contains only odd frames or even frames (by choice)?
For example:
I have "blah.yuv" with 400 frames (0-399).
I want to ...
4
votes
1answer
453 views
What is difference between -ss and -itsoffset in ffmpeg?
This is how ffmpeg describes it:
‘-ss position (input/output)’
When used as an input option (before -i), seeks in this input file to position. When used as an output option (before an output ...
4
votes
1answer
2k views
FFmpeg (MacPorts) - libfaac missing, need new audio encoder
I am so confused.
I am trying a quite simple FFMpeg command to transcode a movie file to a x264/AAC mp4 file via the command line (for Vimeo upload). (Mountain Lion/Macports)
ffmpeg -i INPUT.AVI ...
4
votes
1answer
2k views
ffmpeg: images to 29.97fps mpeg2, audio not sync
I have spent a lot of time on this issue. Hope someone can help.
I want to convert 3147 images + ac3 audio file into an mpeg2 video at 29.97fps (about 1m45s). My command:
~/ffmpeg/ffmpeg/ffmpeg ...
4
votes
3answers
10k views
How to strip audio streams from an MKV file?
I've been trying to remove unneeded audio streams from an MKV (Matroska) file. The reason why I want to do this is to avoid having to manually select the wanted stream in Windows Media Player.
The ...
4
votes
2answers
1k views
Most efficient way to convert a large ALAC library to MP3
I have a large library of CDs ripped to alac which I use as my main music library. I'd like to convert a copy of this library to vbr mp3 for portable devices, however I don't want to have to do this ...
4
votes
2answers
2k views
How can I normalize the volume of a single video file?
I have a video file that was recorded from TV. During recording, we changed the volume levels in between multiple times.
Is it possible to (approximately) normalize the volume of the video track? ...
4
votes
1answer
907 views
Screen Casting using ffmpeg (too fast)
I can use ffmpeg to make screen casts:
ffmpeg -f x11grab -s 1280x800 -i :0.0 -c:v libx264 -framerate 30 -r 30 -crf 18 out.mkv
However the output comes out to be too fast paced. It also happens with ...
4
votes
2answers
849 views
Streaming Desktop using FFMPEG in windows
How to stream Desktop using FFMPEG in windows??
I have tried
ffmpeg -list_devices true -f dshow -i dummy
and after that this to stream
ffmpeg -f dshow -i video="Chicony USB 2.0 Camera" -r 30 ...
4
votes
2answers
7k views
ffmpeg encode subtitle
I know maybe it's not a right place to ask this question but I couldn't find more related Q/A site from StackExchange group so here it goes :
I need to add subtitle to a movie, i already have avi ...
4
votes
1answer
1k views
Why does the quality of this video suck when converted with ffmpeg as opposed to mencoder?
Here's the command line that I'm using for both and the output. Any ideas? The bitrate of the two videos is comparable: both around 1500Kbps.
ffmpeg command:
ffmpeg -y -i aud.mp4 -acodec copy -i ...
4
votes
2answers
4k views
How many threads does ffmpeg use by default?
I see that there's a -threads <count> command line option in ffmpeg. What is the default value of this option?
