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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Inplace modification of incron monitored files

I have samba share where users create video files, i need to stripe audio tracks from that video files and rsync new files to remote folder. I monitor the samba share with CLOSE_WRITE option, to strip ...
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17 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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libav - stream audio via UDP results in overread or underrun

I am streaming small audio files from one raspberry-pi to several other raspberry-pi's. The wireless connection is good, the throughput is good, the ping/latency is good. The receivers look like ...
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3answers
240 views

How do I install ffmpeg on Debian Jessie?

My installation of Debian Jessie is seemingly doing everything it can to prevent me from installing ffmpeg. I have read How to install FFmpeg on Debian?, but avconv is not an option and adding deb ...
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288 views

How to correctly use x265 lossless parameter with avconv

x265 has a lossless mode which is used for ultra-high bitrates with zero loss of quality. I tried using this mode with avconv as follows: avconv -i input.mp4 -c:v libx265 -x265-params lossless -c:a ...
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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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2answers
3k views

speed up video using avconv without quality loss

After having read this page, I'm using avconv (which in this case is apparently same as ffmpeg, and which I need to use instead since I'm on Ubuntu trusty) to speed up a .swf video. I don't want a ...
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590 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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219 views

avconv: Converting from .ts to H264, with high quality screenshots

I am using avconv to convert MPEG Transport Streams to H264. My main goal is to capture high-quality screenshots from the source video files. The TS files are interlaced, so I am first converting to ...
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3answers
6k views

How to install libav manually for Video Download Helper on Windows 7?

I'm trying to get the Firefox Extension "Video Download Helper" (VDH) to convert and record videos. The suggested way of doing this is to install a precompiled version of libav called "Convert Helper" ...
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3answers
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Using avconv (ffmpeg) to concatenate a bunch of .bmps into a mkv/avi video

Trying to figure out how to get avconv to concatenate a bunch of .bmps together into a video file. Here's what I've got so far: avconv -f image2 -i Capture/%d.bmp -vcodec mpeg4 -r 24 -b:v 20M ...
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795 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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40 views

Byte position of frame with closest timestamp with avprobe

With ffprobe I managed to get the byte position of the frame closest to a specified timestamp: the pkt_pos in ffprobe -i audio.mp3 -show_frames -read_intervals 01:30%+#1. Now I am on a Debian system ...
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3answers
4k views

Split MKV based on Chapters

I have a long MKV file which I want to split into its individual chapters. Running ffmpeg -i long.mkv gives me all the information about the chapters embedded in the file: Duration: 01:23:45.80, ...
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37 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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3answers
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Why would I choose Libav over FFmpeg, or is there even a difference?

From what I've seen it looks to me like Libav's avconv 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 would ...
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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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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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54 views

Rotate AVI video by 90 degree

I used to apply this command to transcode videos of my mobile phone to AVI: ffmpeg -i Input.mov -s 640x360 -sameq -vcodec msmpeg4v2 -acodec libmp3lame Output.avi Now I'd like to rotate some videos ...
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48 views

Scaling a video fails

I am using avconv to scale a video to a lower size. I just want to make video width smaller, and allow height to adjust automatically with the width to keep proportions same. After the command, a file ...
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52 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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49 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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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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2answers
291 views

mp4 video for asterisk with ulaw as audio and h263 for video

Scenario: I want to play a video file on asterisk. my softphone only support ulaw/h263 for audio and video respectively. So I am allowing both formats in sip.conf file and expecting it to run. ...
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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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3answers
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How to install libav/avconv on OSX?

OSX comes with a command line video conversion utility avconvert but this tool provides limited functionality compared to the avconv provided by libav. How can I install avconv on OS X?
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135 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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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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Reading specific MKV metadata from avconv

I want to extract a specific piece of metadata from an MKV and use it as the filename of a converted file. Example, if I run avconv -i MyFile.mkv I get the following output avconv version 9.18-6:9....
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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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249 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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1answer
151 views

Avconv only converts a single frame when converting a GIF to WebM format

I am trying to convert GIF images into WebM videos with avconv, but I only get a single frame into the WebM video. Example GIF: I use the flowing command: avconv -i horse.gif -c:v libvpx -qmin 10 ...
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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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1answer
427 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
141 views

Using ffmpeg to extract segment in the middle of long video

I need to extract a 30 second interval from the middle of a video, while converting it to webm. ffmpeg seemed like the perfect one liner: ffmpeg -i long.mkv -vcodec libvpx -b:v 1M -ss 02:00:00 -t 00:...
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2answers
732 views

Capture still image from remote ip cam using avconv

I'm attempting to capture a single still from an ip camera with avconv in ubuntu (server). Can anyone tell me what's wrong with the following command: avconv -i rtsp://[USER]:[PASS]@[IPADDRESS]:554/...
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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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2answers
57 views

mediainfo - different channels depending on source

What are the differences between "side" channels and "back" channels in multichannel audio? I'm converting .mlp files (from a DVD-A) to FLAC and I'm slightly confused by how the channels are ...
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944 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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1answer
959 views

Reuse transcoding outputs to generate multiple files with AvConv

I am trying to find information about how to transcode a file into multiple outputs in one shot, but I don't seem to be able to. Most of the results I find describe the opposite: merging multiple ...
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1answer
248 views

How to extract Blu-ray audio without any conversion?

As avconv (forked from ffmpeg) said, the format of Blu-ray audio stream is called pcm_bluray, but why most of the tutorials say using -acodec pcm_s**le flag (** depends on its sample rate)? Are they ...
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1answer
368 views

Combine audio and video with avconv not merging video

I am trying to combine a ripped stream from YouTube that seems to be in a weird format. Anyway, the video and audio seem to play on their own but when I tried to combine it, the file size is just a ...
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Conversion from WebM to MP4 in Ubuntu is slow and bad quality

I have used the command ffmpeg -i input.webm -q:v 10 -c:a copy out.mp4 I also tried using avconv instead of ffmpeg. The conversion is successful but the quality is bad. Also it takes a lot of time....
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1answer
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Hardcoding FFMPEG subtitles on MP4 / MKV

I am using FFMPEG to hard code subs into a video. Having read many posts on the best approach, and whether to use mkv or mp4, but am still none the wiser. The code below uses an mp4 file. The ...
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1k 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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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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1answer
53 views

Delete .avi videos by length using Linux terminal

How can I delete videos, via terminal, by length of the video? I have a cutoff point of 30 seconds, and I want to delete anything under that. If I select by size (find . -type f -size +27818098c) it ...
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314 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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2answers
4k views

Converting RGB images into lossless video with avconv / ffmpeg

I am trying to convert a series of PNG24 images containing a screen animation to a lossless video, so that every pixel is reproduced exactly as it was in the original. But avconv (and ffmpeg) both ...
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What parameters for lightweight HTML5 video with avconv? [duplicate]

I have this: avconv version 0.8.16-6:0.8.16-1, Copyright (c) 2000-2014 the Libav developers built on Sep 16 2014 23:10:48 with gcc 4.7.2 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'film.mp4': ...