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.

learn more… | top users | synonyms (1)

0
votes
0answers
11 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 ...
0
votes
0answers
3 views

How to limit a source filter with avconv?

I'm combining multiple videos to show them side by side using this script: avconv -i Input0.mov -i Input1.mov \ -filter_complex "color=black:1280x720:24 [BLACK]; \ [0:v] fifo, crop=640:640:320:8, ...
3
votes
1answer
44 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. ...
1
vote
2answers
44 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
45 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 ...
0
votes
1answer
31 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 ...
0
votes
0answers
21 views

avconv: Overlaying & Offsetting Videos

I am trying to overlay multiple videos in a split screen, with different offset (Audio, video both offset), initially I tried offsetting & overlaying like following avconv -i 1.webm -itsoffset 2 ...
3
votes
0answers
103 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
45 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
votes
1answer
57 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
103 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 ...
1
vote
5answers
34 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 ...
0
votes
0answers
75 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 ...
0
votes
0answers
114 views

Avconv doesn't copy audio stream

I am trying to restream m3u8 link to my local rtmp server like this: avconv -i "http://mthls-i.akamaihd.net/hls/live/219508/mthls/06.m3u8" -c:v copy -c:a copy -f flv rtmp://127.0.0.1:1944/live10 ...
0
votes
0answers
61 views

Seeking in live transcoding video (via rtmp)

this is my setup: avconv transcodes a video on the fly and send it to nginx which is configured with rtmp support. I can watch the stream with vlc for example. But I can't fast forward or so. I see ...
0
votes
2answers
220 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, ...
0
votes
0answers
61 views

avconv: Assertion mpah.frame_size >= (32 + 4 + 4 + 4 + 4 + 100) failed

I'm trying to concatenate 2 or more mp3 files using the avconv, but I get the followiong error: Assertion mpah.frame_size >= (32 + 4 + 4 + 4 + 4 + 100) failed at ...
2
votes
1answer
194 views

Debian: Version number of installed package differ from those in repository causing dependency issues

I can't install libav-dbg due to dependency issues with version numbers of installed packages, that do not correspond to those in the repository. How is this possible, and how can i resolve the issue? ...
0
votes
0answers
23 views

Libav, slow internet, the golden median

Some time ago I was to configure a streaming service, unfortunately there were surprises at every corner... (awesome official bugs, delays on deliveries and etc.) After tweaking around a lot I found ...
0
votes
0answers
107 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, ...
0
votes
0answers
127 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 ...
1
vote
1answer
43 views

How can I save an avconv/ffmpeg command for later?

I'd like to save my entire avconv command with options so that I can reuse it without typing it in every time. I would still need to specify the input and output filenames. How do I do this? I'm on ...
1
vote
0answers
723 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 ...
1
vote
2answers
65 views

How do I capture my second monitor using avconv?

With this command: avconv -f x11grab -s 2560x1440 -i :0.0 I can stream video from my main monitor. I also have a second, 1080p monitor on which I do my gaming. I want to stream from that monitor. ...
1
vote
1answer
494 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 ...
1
vote
0answers
233 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 ...
0
votes
0answers
191 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 ...
1
vote
1answer
555 views

Video concatenating, with overlay

I have a video recorded from a gopro which is split into 3 parts as the maximum filesize is reached after about 17 minutes and the gopro automatically splits it into multiple parts. I also have a ...
0
votes
1answer
375 views

Reducing video size with avconv… why does the size increase?

i have an android video: $ mediainfo 20140324_192544.mp4 General Complete name : 20140324_192544.mp4 Format : MPEG-4 Format profile ...
1
vote
1answer
241 views

How to make avi (MJPEG codec) by avconv for iphone?

I try to make video from pack of jpg by avconv and open it on iphone. I make avi file using MJPEG by command: avconv -r 10 -i %06d.jpg -r 10 -vcodec mjpeg -qscale 1 out.avi Eveything is ok on my ...
1
vote
0answers
136 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 ...
1
vote
1answer
208 views

How to convert any video to .avi with wmv1 codec using ffmpeg/avconv?

I have installed ffmpeg to convert a video. I am trying to convert a .mp4 to a .avi video with the codec wmv1. How to do this? I am using the command avconv in a Kubuntu terminal. Last attempt I did ...
0
votes
0answers
112 views

Automated avconv recordings script

I'm currently recording video from my IP camera to disk by making use of avconv (ffmpeg). avconv -i rtsp://192.168.1.1/stream -c copy pool.mp4 This works great as my feeds are already h264, I ...
0
votes
0answers
86 views

Read frames into Matlab with avconv

I have a very large video file (5.9 GB - 120fps at 1.3 megapixel for 2h) from which I want to extract a few hundred frames at known, sparse time points, and send via the shortest path to Matlab. ...
0
votes
0answers
59 views

Converting with avconv without trying to increase quality

This might just be a quick question or a matter of a specific flag, but I have a standard format that I use for storing videos on my computer. The idea is to cut down on storage requirements while ...
0
votes
1answer
281 views

avconv recording pulseaudio output monitor stretches audio

Recording audio from pulseaudio output monitor results in stretched audio: The audio falls out of sync as it moves slower than the video I've checked, the video is in sync, it's the audio that's ...
1
vote
1answer
1k views

What is the difference beetween ffmpeg and libav, and how to chech which one is used for application? [duplicate]

I am working with some gstreamer based application and some other streaming stuff and I came to some confusion: What is difference between libav and ffmpeg? I found no explanation what are they and ...
0
votes
1answer
40 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 ...
0
votes
1answer
2k views

ffmpeg/avconv async is not working - unsync audio

I have a javascript that records video from a webcam as webm and audio from microphone as wav together. I am encoding these webm and wave files to generate a mp4 file using ffmpeg/avconv. But i've ...
0
votes
0answers
456 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 ...
1
vote
1answer
586 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 ...
0
votes
1answer
405 views

avconv gets killed if mkv has subtitles

What I'm trying to do is to take a movie (in an Matroska container), convert all audio tracks to AC3 and don't touch anything else. I'm using this line: avconv -i infile.mkv -map 0 -vcodec copy ...
0
votes
1answer
62 views

Human insensitive video compression

I have an AVI video file recorded by my laptop web-cam. It's only 10 minutes but it has so large size, 3.9 GB! I'm not expert in multimedia but I've seen really good quality long movies in only 4 GB. ...
2
votes
1answer
926 views

Resizing with avconv causes pixellation in output

I am trying to resize a video from 1920x1800 to 1280x720 for phone viewing. This is the command I used: avconv -i input.mkv \ -map 0:v -map 0:a:1 -map 0:s:0 \ # map video, 2nd audio stream, and ...
3
votes
1answer
3k views

Burn-in subtitles with avconv?

I have a mkv file and want to convert it to an DVD compatible mpg file with avconv. How can I also burn-in one subtitle stream from the same mkv file? avconv -i input.mkv -map 0:0 -map 0:1 -target ...
2
votes
2answers
4k views

reduce size of mp4 using avconv

I'm looking at this question Reduce size of MP4 and I want to do it using avconv, however, I'd also like to shrink the frame size by about half. My problem is when I do avconv -i "$file" -s 640x480 ...
0
votes
1answer
1k views

avconv can't convert stream to MP4 file, fails with “Unable to set encoding parameters”

I'm trying to script some testing of Wowza Media Server. Basically, I'm attempting to just beat the living bejeepers out of the thing. I have 5 slightly older computers, originally XP boxes, which I ...
1
vote
1answer
187 views

Where in FFmpeg is the DTS decoder located?

Where is the actual DTS decoder located? When I search through the FFmpeg folders, dtsdec.c and dtshddec.c show up, but they're only 2–4 kB, and don't have any actual decoding code anywhere within ...
0
votes
1answer
476 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 ...
1
vote
0answers
387 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 ...