Libav is a fork of the popular FFmpeg multimedia tool, best known for appearing in the Ubuntu packages. Include the full, uncut console output when asking for help with a command.

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How to increase video speed and frame rate without duplicating frames

I have a long video with a frame rate of 30 FPS that I want to convert into a 200x time-lapse with a frame rate of 60 FPS. My only problem is that avconv is unnecessarily duplicating every other frame ...
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2answers
634 views

How to strip metadata from MP3 files?

I want to strip metadata from MP3 files. In a brief: How to simply get a stream of pure MP3 frames out of a MP3 file – by means of command line tools? Preferable using tools out of the box of a linux ...
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2answers
3k views

How to install libav-tools in centos 6

I used tutorial to compile it from source but it never worked for me. I am facing error on following points Download x264 codec and compile it: git clone git://git.videolan.org/x264.git x264 cd ...
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1answer
3k views

How do I merge a folder of PNG images to a mp4 movie using avconv?

I have a folder containing many time stamped PNG images which I'd like to merge to a short movie. The contents of that directory looks like this: └── images ├── img_20130421_115547.png ├── ...
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1answer
441 views

avconv stream to rtmp via nginx-rtmp-module - convert into html5 file/stream

just keeping things short at the beginning. I stream via rtmp with avconv through a nginx configuration. Catching that stream onto a website is only possible via flash as far as i know. Nowadays it'...
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1answer
877 views

How to use avconv or ffmpeg to convert any video to an exact size and shape

We have a system that supports streaming video, but we support multiple players. I have multiple systems that I COULD use for this. Currently, I've been using the media server that we use to stream ...
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1answer
2k views

Encoding multiple video streams with a single avconv invocation

I played with avconv on Ubuntu and I'm now able to e.g. record the desktop with sound from a soundcard. One thing I wanted to do was recording two video inputs at the same time, for instance the ...
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1answer
35 views

Specifying icecast protocol options in ffmpeg/avconv on Raspbian Lite

I'm very new at this Raspberry Pi 3 thing, but not afraid to delve into docs and examples. I've cobbled together commands and fixes to record audio from USB device - ultimately trying to stream ...
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1answer
645 views

Basic conversion of sequence of images to avi with avconv

I'm trying to convert sequnce of images to small avi. Each image should be shown 2 seconds. I'm using this basic command sudo avconv -r 0.5 -i test%05d.jpg out.avi I get the output, but it shows ...
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1answer
761 views

Convert mkv with AVC High@L4.0 to mp4 with ACV High@L4.1 or higher

I am trying to convert some mkv files I have to mp4 so that they can be played to my chromecast. Here is the information about the video files. mkv file information As you can see that the video ...
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1answer
87 views

How can I make the output format of a video the same as the input format?

How can I make the output format of a video the same as the input format for general case? avconv -i source -vcodec copy -acodec copy -movflags empty_moov -f ??? output I would not like to use -f ...
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1answer
1k views

How can I record a video signal in Linux from the command line?

I have a Linux machine with a Pinnacle video card. I wanna record a video signal from my TV connected to the S-Video input in my Pinnacle card. I could record using VLC GUI, but I wanna cron it, so I ...
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1answer
1k views

How do I merge two videos and increase sound volume using Avconv?

I'm trying to merge two cd-s into 1 file and also boost sound volume 200%, I tried this using avconv tool, but I only got cd1 and without an boost in sound: nohup avconv -i cd1.avi -i cd2.avi -vcodec ...
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0answers
676 views

Accurate and reliable movie editing with avconv

I'm trying to perform movie editing in an automated way with avconv. It is made in two steps: extract some parts of an input movie: concatenate the parts to form an output movie: I tried some ...
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0answers
1k views

Why does avconv change the fps when deinterlacing?

I have a .MTS 1080i of 25fps (mediainfo) that I deinterlaced with avconv -i input.MTS -vf yadif -c:a copy output.mp4. As the wiki says, the default value for yadif is 0 which "outputs one frame for ...
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0answers
619 views

Non monotonically increasing dts to muxer in stream 1

I have an error with 1gb videofile and avconv Application provided invalid, non monotonically increasing dts to muxer in stream 1: 177873 >= 177849 av_interleaved_write_frame(): Invalid argument ...
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0answers
2k views

Avconv increases file size

I am using the version of avconv in Ubuntu 12.04 to archive videos. I would preferably use some kind of lossless video compression (e.g., huffyuv or FFV1), but using the original video stream (copy ...
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2k views

avconv stream video from USB webcam without delay

I need to stream video from USB webcam. I am using avconv, but it has delay min 5s. Is possible to stream in real time without delay? avconv -f video4linux2 -i /dev/video0 -vcodec libx264 -f mpegts ...
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0answers
440 views

ffmpeg/avconv crashes when video frame isn't expected size

I'm capturing my webcam using ffmpeg/avconv, but I keep running into this problem: The v4l2 frame is 828212 bytes, but 829440 bytes are expected And then it crashes. It should just skip that frame, ...
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0answers
14 views

Prevent AVCONV from upgrading A/V quality

I am trying to convert all video files of different formats and qualities into one semi-standard format. Thankfully avconv makes this reasonably easy. This is the command that I am using: IFS=$'\n'; ...
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0answers
12 views

libav - readability of text from high resolution to low viewing resolution

Scenario: Trying to create a screencast of a linux system for a tutorial.. The two monitors I have are a combined (3400x1200).. When I play it back on a windows machine, either using VLC or Windows ...
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17 views

Cropping with avconv

I am trying to crop a video with avconv avconv -r 25 -i test.avi -vf "crop=out_w=in_w" -b 1024k test2.avi but avconv tells me Invalid chars '=in_w' at the end of expression 'out_w=in_w' whatever ...
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55 views

avconv / ffmpeg covert images to video skips frames when frame type changes

I have an instance of ffmpeg that captures one fps from our home CCTV cameras. At the end of the day I have an ffmpeg script that takes those images and turns them into a video. This is fine with one ...
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993 views

streaming to rtmp using avconv or ffmpeg

I have an IP webcam HiSilicon Hi3516C that I can successfully access from a raspberry pi. I can get still images by using a command like this: avconv -i "rtsp://192.168.1.10:554" myfile.jpg now ...
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1k views

How do I get avconv/ffmpeg to output video with specific tbn, tbc

My father can only use an old video editor (Pinnacle Studio 12) that is very picky on what video files it imports. Here is the output of avprobe one of the videos it manages to import: encoder: ...
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322 views

FFmpeg / libav / Avconv settings to add higher contrast to a video

I successfully convert videos to mp4 from images turning the video black and white, is there a way to add contrast and brightness to balance the higher contrast so that it looks sharper? Here is the ...
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0answers
383 views

Access to IP camera stream

I'm trying to set up three IP cameras I got for using them in ZoneMinder. According to the webinterface of the camera, the stream can be viewed at: http://192.168.47.202:8090/live.asf But, since I'm ...
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0answers
375 views

Converting RAW Blackmagic Intensity Card frames

I am trying to convert raw video frames that I have captured using a Blackmagic Design Intensity card. The output frames are of the format: YCbCr 4:2:2 packed 8 Bit UYVY Abekas How can I convert ...
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0answers
2k views

Using avconv to convert an animated gif to mp4 with sound

I want to convert an animated gif and a midi (music) file into a mp4 video. Is it possible? I saw a lot of topics on documentation, foruns and stackexchange sites, but I didn't find. It works with 1 ...
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0answers
608 views

Why can't I seem to get the framerate right when using avconv to convert a sequence of images to a gif?

I need to convert a series of images to gifs. I found three broad ways to do this. One involving ImageMagick, One involving gifsicle and another involving avconv. I can't use Imagemagick because it'...
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270 views

Piping images to avconv at unknown fps

I am currently reading images from a camera "as fast as possible" (>50fps), outputting them as JPEGs, and piping them to avconv using the image2pipe input. What is a good approach to getting the ...
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0answers
599 views

Use avconv to convert iMovie DV streams to other formats

I have a bunch of DV streams that were imported from a DV camcorder using iMovie. Unfortunately, neither avconv nor VLC seem to be capable of converting these files correctly, whereas QuickTime ...
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0answers
426 views

AVCONV errors while grabbing af stream from an IPCAM

When im trying to grab a stream from my D-Link DSC-932L Cam, using avconv, I keep getting errors. Depending of framerate etc. the proces will terminate whitin a minute. Here is the string and common ...
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0answers
11 views

Combining multiple WAV files into a single MP3

I'm trying to combine a number of wav files into a single mp3. The simplest command I can come up with is this: /usr/bin/avconv \ -y \ -i input1.wav \ -i input2.wav \ -i input3.wav \ -i input4.wav \ -...
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0answers
39 views

How can I use Libav to convert a multipage tiff into a video

I have a multipage tiff with many frames. If I try to convert that using libav it only recognizes the first image in the stack: $ avconv -y -v debug -f image2 -i 151123_chan3-2_#1.tif 151123_chan3-2_#...
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67 views

avconv - Error for scale filter

I'm trying to rescale a video via avconv with the following command: /usr/bin/avconv -i /home/user/video.mp4 -filter:v crop=960:720:160:0,scale=h=498:w=-1 -an -y -frames:v 1 media/image.png But I'm ...
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0answers
54 views

How to redirect video subtitles to pipe?

I am watching subtitled videos. I would like the subtitles to be sent to a pipe instead of being displayed on the video. The aim is to process the subtitle data with some other software, like sed, in ...
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0answers
55 views

Use avconv and image magick to convert video into reduced size gif

I'm using this answer to convert a video capture of a small section of my screen to a gif for a tutorial on a webapp. The problem is that the gif conversion increases the file size. avconv -i video....
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0answers
153 views

openRTSP default 25fps encoding (not 24)

I want to capture the RTSP stream from some IP cameras, and after looking around I found 2 great tools to do this: avconv and openRTSP openRTSP -u user password rtsp://10.48.34.125/axis-media/media....
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39 views

issue sending user and password in VLC

Basically I have a net where I can do this without problem: vlc rtsp://10.48.1.10/mpeg4/media.3gp --rtsp-user=user --rtsp-pwd=password but when I do this: vlc rtsp://user:password@10.48.1.10/mpeg4/...
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0answers
83 views

avconv combined audio and video streams, mplayer fails to play audio

I have a movie.avi file compressed with DivX which I'm trying to recompress with H264. I compressed the video stream with x264, leaving the audio as is. I'd prefer to compress everything at once, but ...
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0answers
267 views

avconv Error “Header missing” while converting mkv audio to AAC

I want to convert Videos from MKV (h.254 + MP3) to MKV (h.264 + AAC), because the Chromecast no longer supports MKV with MP3. When I try avconv -y -i /media/user/Data/toImport/Fr\ S02-01\ Das\ ...
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0answers
380 views

avconv and ffmpeg: errors reading png files

I'm trying to use avconv to overlay data onto a video. I generate PNG files representing the overlay data at 4fps. The PNG files are the 120px wider and 60px taller than the original video, because ...
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0answers
185 views

Force avprobe format detection

I have a gif file without an extention called loop. the command avprobe loop returns: [mp3 @ 0x7faa59004a00] Format detected only with low score of 1, misdetection possible! avprobe subsequently ...
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206 views

Ubuntu Screencasting: Libavdevice segmentation fault

I'm trying to stream to twitch a screencast of a remote desktop, but I meet some segmentation fault. The OS is: Xubuntu 14.04 , xfce, x2go I tried with Ubuntu 14.04, Ubuntu 12.04, ffmpeg and avconv, ...
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0answers
468 views

FFmpeg/Avconv: Scaling Filter “Error when evaluating the expression”

I'm trying to scale a video with FFmpeg with the following command: ffmpeg -i input.jpg -vf scale="'if(gt(a,4/3),320,-1)':'if(gt(a,4/3),-1,240)'" output_320x240_boxed.png This is taken verbatim ...
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0answers
800 views

Understanding avconv console output

I'm using avconv to broadcast a video on justin.tv from my Raspberry Pi. I get it (weakly) working a very few times. Most of the times justin.tv is not being updated and says "disconnected". The ...
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0answers
624 views

avconv overlay for live video

I want to combine two stream and I want a single stream with both video in a single stream by simultaniously, both stream want to be visible at a time left half first video should be there and right ...
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0answers
683 views

How to loop audio when mixing with longer movie in avconv

Is it possible to loop audio when mixing with longer movie using avconv? I want music to repeat itself through whole movie. In avconv manual i found parameter "-flags loop" but it doesn't work. Music ...
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0answers
2k views

avconv and ffmpeg - drawtext filter text_w evaluates as 0 in Ubuntu Precise

I'm attempting to draw text onto a video using either the avconv or ffmpeg commands. When specifying x= for where on the final video to place the text, the 'text_w' value is evaluating to 0, rather ...