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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27 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 ...
0
votes
1answer
40 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 ...
0
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0answers
38 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
27 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 ...
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0answers
11 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 ...
1
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2answers
121 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. ...
2
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0answers
8 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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0answers
70 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 ...
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0answers
27 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 ...
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2answers
45 views

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 ...
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0answers
50 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 ...
3
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0answers
179 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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0answers
128 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\ ...
2
votes
1answer
106 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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0answers
45 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 ...
1
vote
1answer
266 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 ...
0
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1answer
124 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 ...
1
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1answer
81 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 ...
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2answers
265 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 ...
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0answers
566 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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2answers
50 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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2answers
3k 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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0answers
115 views

Pipe remote jpg webcam image to ffmpeg as video

I have a cheap ip webcam. All it provides is a single http url to a static jpg file. Such as http:///image.jpg. Repeatedly requesting the same url will provide subsequent frames from the ip camera. ...
0
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1answer
296 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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0answers
26 views

avconv - how to use two input files for transcoding to maximize quality

Let's say I have two video files encoded in lossy formats, for instance sample.mp4 (H.264) and sample.265 (H.265). Now I want to transcode to sample.webm (VP8). We all know transcoding degrades video ...
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votes
1answer
207 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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0answers
98 views

avconv stream dies after 2 hours

I have a live stream running from a Raspberry Pi camera using the following command: avconv -f h264 -r 25 -i fifo.264 -metadata title="Raspberry Pi Camera Module (LIVE)" -f flv ...
0
votes
1answer
289 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 ...
2
votes
1answer
928 views

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 ...
2
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0answers
921 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
788 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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0answers
100 views

How to constrain/stretch a video to a fixed duration using ffmpeg or avconv?

So I have a few hundred clips of videos, about 1 to 5 seconds each, that I'd like to all play at 2 seconds each...this means for the 1 second videos, they get stretched out, and the 5 second videos, ...
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3answers
3k views

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 ...
2
votes
1answer
51 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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0answers
258 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
25 views

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': ...
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2answers
2k 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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0answers
304 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 ...
0
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0answers
141 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 ...
3
votes
1answer
3k views

How do I extract the timestamps associated with frames ffmpeg extracts from a video with the -r option?

ffmpeg -i myvid.mp4 -r 25 -t 100 image-%d.jpeg Is the command I'm using to extract frames and it's working just like I expected. However I'd also like to look at the timestamps of the frames. ...
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2answers
389 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 ...
0
votes
1answer
505 views

avconv gives empty output

I tried converting a video file to a desired format using FFmpeg through WinFF. I have specific demands about some aspects of the output file, while other aspects should be set in a way which will ...
1
vote
1answer
831 views

Piping output from ffmpeg/avconv over ssh to a file

I like to pipe the output from ffmpeg/avconv over ssh to a file. I would like to do something like this. ssh USER_NAME@SERVER_IP "avconv -i ...
3
votes
0answers
852 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 ...
0
votes
1answer
144 views

Confused about timecode/fps results when using avconv/avprobe

I'm using avprobe to get information about timecode and fps from videos. Getting the information isn't a problem but I'm a bit confused as to the result. When running avprobe on an H.264 file I'm ...
0
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1answer
592 views

Concatenate .mp4 videos of different encoding parameters using avconv without losing quality?

How can I use the avconv tool to concatenate multiple .mp4 videos of different encoding parameters in a single container, without losing quality?
0
votes
1answer
626 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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5answers
587 views

How to convert from .avi container to .mp4

I have an .avi file containing the following streams: Stream #0.0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 608x256 [PAR 1:1 DAR 19:8], 23.98 tbn, 23.98 tbc Stream #0.1: Audio: mp3, 48000 ...
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0answers
315 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 ...
2
votes
3answers
3k 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, ...