`ffmpeg` is a free software project aimed at producing tools (libraries and programs) for handling multimedia data.

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2answers
391 views

ffmpeg batch convert .avi to .mp4 - in ash

I'm looking to batch-convert a directory (or several) of video files from .avi to .mp4 containers, just copying the video and audio streams across. I know the ffmpeg command to do this, and have no ...
0
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0answers
611 views

Cygwin compilation error in ffmpeg: gcc is unable to create an executable file

While i am executing the below command in cygwin in ffmpeg source directory ./build_android.sh Here is the for ffmpeg in android I am getting this error message ...
0
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1answer
176 views

Avconv creates 0 byte outputfile after applying frame rate reduction

I installed avconv because I am too stupid to install ffmpeg, now I realized I am even more stupid. I tried to reduce the framrate from 30 fps to 24 fps following a very straigtforward tutorial: # ...
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2answers
4k views

How to check if a shared library is installed?

My question origins from my problem getting ffmpeg started. I have installed ffmpeg and it is displayed as installed: whereis ffmpeg ffmpeg: /usr/bin/ffmpeg /usr/bin/X11/ffmpeg /usr/share/ffmpeg ...
0
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1answer
254 views

How to reduce the size of an mpeg file using the command line ?

I have a file, the output of the file command displays: jeff_western2.mp4: ISO Media, MPEG v4 system, version 1 I do not know how to lookup the resolution but it looks quiet high, the file itself ...
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1answer
336 views

How to use sox or ffmpeg to detect silence intervals in a long audio file and replace them by zeros (aka suppress background noise)?

I have a long audio file that was created by concatenating many short files. I would like to detect silence between the speech segments (just a threshold is enough for my purposes) and replace them by ...
0
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1answer
439 views

Alternative to ffplay for Raw Video Playback without X Windows

I am successfully capturing frames from a small USB IR camera on the small Raspberry Pi Linux board. I am using the 'libseek' code to do this: https://github.com/zougloub/libseek I can see alot of ...
2
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2answers
3k views

Convert a video to a fixed screen size by cropping and resizing

I've tried to figure this out myself, but the myriad of options just baffles me. I want to use ideally either ffmpeg or mencoder (or something else, but those two I know I have working) to convert ...
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0answers
255 views

Playback and simultaneous recording through external USB sound card

I've an external USB sound card (in my case it's a TerraTec Aureon 7.1 USB). I've looped the earphone-out to the line-in using a 3.5mm jack cable. I'm interested in starting the playback of a MP2 ...
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0answers
83 views

extracting codec information from rpt stream

I got a list of rtp streams in a list, those are tv channels from my internet provider. I would like to get information about the codec and get the channel names instead of ip addresses, precisely ...
0
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1answer
260 views

Find and convert all ALAC files to mp3 / opus / aac

I'm looking for a way to convert all alac files in a directory recursively to another format. Problem: alac as well as aac use suffix m4a, so find -name "*.m4a" doesn't work.
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1answer
584 views

Error while making movie from png's with avconv or ffmpeg

I want to create a movie from a bunch of png's by using the command: avconv -i pics/*.png out.mp4 or ffmpeg -r 1/1 -start_number 1 -i pics/*.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4 ...
0
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1answer
684 views

Why convert .GIF to .MP4 file using by ffmpeg on Mac OSX got .MPEG4?

ffmpeg -i original.gif -r 10 outfile.mp4 According to command above, I've got outfile.mp4 but when clicked to see the information of file, i see it's actually a .MPEG4 file and the icon of file is ...
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0answers
40 views

timout command is not timing out

I have a timeout command that is not timing out. user@db:~$ ps aux | grep 'timeout' user 4979 0.0 0.0 4440 628 pts/144 S+ 18:52 0:00 sh -c timeout 16 mycommand user 4980 0.0 ...
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0answers
1k views

How to record video from an old webcam using ffmpeg on Linux?

After couple of hours I'm finally ready to accept my absolute lack of knowledge in that topic and decided to post this question here. I've been trying to record video from an old external USB webcam ...
4
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1answer
1k views

Trim audio file using start and stop times

I have an FFmpeg command to trim audio: ffmpeg -ss 01:43:46 -t 00:00:44.30 -i input.mp3 output.mp3 The problem I have with this command is that option -t requires a duration (in seconds) from ...
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2answers
236 views

Change of voice via ffmpeg or other application [closed]

I have a set of audio files containing voice recordings, I need to alter the voice signal so the speaker cannot be recognised in an automated way... Do you know some application?
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1answer
196 views

ffmpeg is killed

So I have a problem here. I have a session of ffmpeg -f x11grab running, and suddenly kill -9 or Ctrl+Alt+Backspace comes and GUI dies of course. So far everything seems to be OK. When I try to play ...
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0answers
111 views

error with Transcoding with ffmpeg activated by inotify

I’m trying to automatically transcode videos, that are begin uploaded constantly to a server. That is why I have came up with the idea of using inotify, by checking every moment for new files on the ...
2
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0answers
68 views

How to define ffmpeg's path during compilation of another software?

I'm trying to compile an opensource software that needs bleeding-edge ffmpeg, so I successfully compiled ffmpeg, but I don't want to run make install as it's not easy to be removed after my tests. ...
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0answers
1k views

FFMPEG - Interpolate frames or add motion blur

I just watched the trailer for the hobbit, and a trailer for the avengers which both feature an increased framerate. A lot of the comments state that this isn't "true" 60fps since it was not shot at ...
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3answers
2k views

Convert to WAV using FFMPEG for pipe into LAME?

I'm trying to convert an AAC file into WAV in order to pipe the output into LAME. I'm looking to do this, specifically: find . -maxdepth 1 -type f -iname "*.m4a" | sort | while read file; do ...
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1answer
1k views

How to use a wildcard in FFMPEG?

Lets say I want every .mp4 file in a folder as an input file. How does one do that? It only reads it literal.
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1answer
656 views

Burning a video file with non-standard aspect ratio to DVD

A standard Unixy command line approach to burning a video file to DVD is as follows (assuming) # 1. First use ffmpeg to convert to an mpg file. ffmpeg -i input.m4v -target ntsc-dvd output.mpg # 2. ...
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1answer
142 views

Application specific DNS problem?

I'm working on a live stream transcoder application using nginx + ffmpeg. Everything works fine when I use avconv to transcode, but if I use ffmpeg, I get this error: [tcp @ 0xb4e9da0] Failed to ...
2
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2answers
190 views

Convert video to exactly the same format as another video

Suppose I have two video files A and B. Now I want to convert A to the same format (i.e. same container, same audio and video codec), same bitrate, size etc. as B. Is there a way to do this ...
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0answers
367 views

Centos web camera, fast application for snapshot?

I'm using ffmpeg for taking snapshots / still images with web cameras. I'm going to use several web cameras to take photos at the same time or one after the other (timelapse). It's important for me ...
1
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1answer
5k views

FFServer streaming H.264 from Logitech C920

I'm having some trouble trying to implement a web live stream from my Logitech C920 webcam w/ H.264 encoding using ffmpeg/ffserver. Here is the configuration file I'm using for the ffserver: # Port ...
1
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1answer
302 views

Convert video changing only bitrate

I have a mediaplayer program which lags playing one specific file. My assumption is that it is because of too high video bitrate (41.3 Mbps) and too slow CPU (it is embedded system). So, I want to be ...
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1answer
249 views

How to create a timed video from still images with specific time between each image?

I want to create a video from still images. My images are: 1.jpg 2.jpg 3.jpg 4.jpg 5.jpg 6.jpg 7.jpg 8.jpg 9.jpg Each of them I want to show for a specific duration, between 1-10 seconds: 1.jpg: ...
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0answers
432 views

Convert images and animated gifs to video

I use the following FFMpeg command to convert images to video. for file in %N; do ffmpeg -framerate 15 -pattern_type glob -i '*.jpg' -vf ...
1
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1answer
200 views

x11grab flickers in OpenGL draw areas

I'm using ffmpeg's x11grab to do some screencasting. It works pretty well except on 3D stuff. In particular it seems like 3D draw areas flicker in and out. You can see an example of it here. The ...
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0answers
66 views

Black screen when splitting media files

When I run for i in $(ls *mp4); do ffmpeg -i $i -ss 0 -t 720.0 -vcodec copy -acodec copy $i-part1.mp4; ffmpeg -i $i -ss 720.0 -vcodec copy -acodec copy $i-part2.mp4; done; in a directory of ...
1
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1answer
195 views

x11grab from another display server

I have ffmpeg with x11grab on my local machine, but I want to capture the screen of an X server on 12.34.56.78. How can I do that? The following doesn't work: ffmpeg -f x11grab -r 25 -s 800x600 -i ...
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0answers
691 views

How to record v4l webcam with ffmpeg? Cannot find a proper format for codec 'none'

Goal is to capture video from my old usb webcam (device 0733:0430). Trying to save video gives this error. (I've tried both ffmpeg and avconv.) Command ffmpeg -f v4l2 -i /dev/video2 -s 160x120 ...
1
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1answer
283 views

How to add aac and libx264 to FFmpeg installation?

I've already installed FFmpeg according to the ffmpeg Ubuntu compile guide. I can't use aac audio encoding and libx264, which I need. How do I install FFmpeg so that all the option below are enabled ...
2
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1answer
9k views

FFmpeg - Split video multiple parts

I read the following thread, and the solution works if I want to split a video into pieces every two minutes: Split video file into pieces with ffmpeg The problem is that I want to split a video into ...
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2answers
452 views

Slow down mp3 audio

I love VLC's option of slowing down audio playback. Now I want to take my mp3-files to a portable player and play them there. Unfortunately the player does not have a slow down option. How can I ...
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0answers
73 views

FFMPEG stream won't show up on Justin.tv

INRES="1366x768" # input resolution OUTRES="1366x768" # Output resolution FPS="35" ...
2
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1answer
954 views

FFmpeg doesn't recognize my audio sources

I want to record my screen with audio for practice. I saw recommendations to use this command line: ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 25 -s 800x600 -i :0.0+200,100 -c:a pcm_s16le -c:v ...
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2answers
2k views

Is there any equivalent to the atempo ffmpeg audio filter but for avconv to speed up video(and audio)?

As noted here, we could speedup audio with ffmpeg using ffmpeg -i input.mkv -filter:a "atempo=2.0" -vn output.mkv But on Ubuntu, ffmpeg is replaced by avconv, and the atempo filter is not available ...
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0answers
807 views

avconv stops streaming after some time

I am using raspberry-pi board and a usb camera attached with it. i use avconv tool to capture live video from camera and streaming it on network using rtp protocol. My command on server(raspberry-pi ...
2
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1answer
840 views

mplayer not sending the correct user-agent

I am trying to play a stream through mplayer. Here is the command I execute: mplayer -user-agent "PS4 libhttp/1.60" -cache 8192 -v ffmpeg://http://the_stream_url.m3u8 The stream does not play due ...
2
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0answers
271 views

how to install avxsynth on centos?

i am using centos 6 x86_64 and i am trying to install avxsynth for centos, but it always failed from link page i found that i have to install automake libtool MPlayer sudo apt-get install ...
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2answers
1k views

How to remove silence part from mp3 that is extracted from tv drama

I hear a mp3 that is extracted from some tv dramas as a English exercise. So in that mp3 there are lot of "silence part" in which no one speaks and there is no background music. Is there a way to ...
0
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1answer
192 views

Can I get the ffmpeg command-line from an existing video?

I want to generate a video with the exact same settings as an existing video. I can run: ffmpeg -i original.mp4 To get human-readable info about the contents: Duration: 00:05:32.32, start: ...
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0answers
303 views

Grab from a webcam

On Linux it is easy to use an audio or video grabbing device as input to FFmpeg: ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 out.flv Today someone in kirupa forums said they ...
7
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2answers
1k views

How to input a network file to ffmpeg

My problem is this. I have access to a server that hosts many video files, most of them are very large and not well compressed. I intend to make a reduced quality smaller size copy of these on my ...
3
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1answer
152 views

How to tape a video running on the screen? (screen capture)

I am trying to capture video and audio from the screen, loudspeakers and microphone. I would like to do that with a command-line command. So far, ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 ...
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0answers
162 views

screen capturing fails when trying second time by using ffmpeg

I'm trying to capture screen by using ffmpeg. ffmpeg -video_size 1024x768 -framerate 25 -f x11grab -i :0.0+100,200 output.flv It worked at first, but after I end the first capture by Ctrl + C, ...