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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22 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 ...
3
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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
29 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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1answer
807 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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1answer
21 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
32 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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3answers
37k views

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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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
43 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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222 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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62 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. ...
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1answer
873 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
118 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
23 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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1answer
88 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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3answers
1k 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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67 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 ...
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1answer
152 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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3answers
1k 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
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1answer
403 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 ...
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0answers
455 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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433 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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75 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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55 views

avconv: convert sequence of randomly-named images to video

I have files named like alice.png, bob.png, charlie.png (there are hundreds of them) and I would like to make video from those. What I try is avconv -i alice.png -i bob.png -i charlie.png -r 25 -b:v ...
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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
169 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
3k 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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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
1k 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 ...
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2answers
1k 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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218 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
85 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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0answers
13 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, ...
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1answer
2k 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
218 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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1answer
360 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 ...
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5answers
440 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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1answer
505 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 ...
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0answers
102 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 ...
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1answer
14k views

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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625 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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1answer
107 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 ...
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1answer
377 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?
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2answers
196 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. ...
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1answer
436 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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2answers
6k 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 ...
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0answers
641 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
230 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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213 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 ...
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115 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 ...