Questions tagged [libav]
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.
46
questions with no upvoted or accepted answers
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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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4
votes
1
answer
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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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4
votes
0
answers
715
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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 ...
- 163
3
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0
answers
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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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3
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0
answers
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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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2
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0
answers
3k
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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 ...
- 121
2
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0
answers
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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 ...
- 121
2
votes
0
answers
599
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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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1
vote
0
answers
281
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Why do I run out of memory when streaming video from a webcam to YouTube on a Raspberry Pi?
I am trying to stream video for a YouTube livestream, which I want to stream 24/7 if possible. I have a Raspberry Pi Model 3 Model B with a USB Webcam (Logitech G922).
I'm using this command for ...
- 285
1
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0
answers
53
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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';
...
- 490
1
vote
0
answers
32
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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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1
vote
0
answers
299
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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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1
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0
answers
225
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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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1
vote
1
answer
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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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1
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0
answers
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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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1
vote
0
answers
684
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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 ...
1
vote
0
answers
684
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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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1
vote
0
answers
765
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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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1
vote
0
answers
969
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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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1
vote
0
answers
448
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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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1
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1
answer
1k
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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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1
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0
answers
688
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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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1
vote
0
answers
456
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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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1
vote
1
answer
3k
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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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0
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0
answers
26
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Is there a way to increase the visible dimesions of a mp4 video?
I recorded a video on the Kindle and transferred it to the Ubuntu laptop. The mp4 video claims to be 1080x1920 but it is small when run in VLC.
Running it in VLC with a crop of 2:21:1 is effective. ...
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0
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0
answers
236
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Why is the libvo-aacenc / libvo_aacenc not found?
When using this https://libav.org/releases/libav-12.3.tar.gz library and running in the folder: "./configure --enable-static --enable-version3 --enable-libvo-aacenc" the error "ERROR libvo_aacenc not ...
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0
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1
answer
65
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avconv: create a video from a set of static gifs in a directory
I have a set of non-sequential gif images in a directory and I am trying to combine them into a video using avconv. There are approximately 150 frames of identical size (3400x1600). I would like to ...
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0
votes
1
answer
281
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hot reload overlay with avconv
I use avconv to encode a rtmp stream.
I have a PNG overlay over the video.
I would like to, each time the png picture is updated, the overlay is updated to.
Si I try to add:
-f image2 -loop 1 -i /...
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0
votes
1
answer
53
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linux avconv: how to extract a parameter sceme to create new video?
I have different video files, clips. Some are mp4, m4v, flv... withdifferent rates orI don't know which differences more.
The point is, I want to merge files, which I created from input files with ...
0
votes
1
answer
879
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How do I use ffmpeg to increase the framerate of a video without affecting audio quality?
I have a ~30k frame video at 25 fps that I'd like to make 50 fps and keep the same running time. This would probably involve duplicating every frame. However, I'd like the audio track to be unchanged. ...
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0
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1
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Looping in avconv with -codec copy
This is the command I'm using:
avconv -loop -1 -re -i "$SOURCE" -codec copy -f flv "$FACEBOOK_URL/$KEY"
I'm struggling with some performance issues when I run avconv on my server to stream a video ...
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0
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0
answers
221
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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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0
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1
answer
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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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0
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0
answers
846
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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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0
votes
1
answer
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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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0
votes
0
answers
841
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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 ...
- 101
0
votes
0
answers
615
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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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0
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1
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Convert mkv with AVC [email protected] to mp4 with ACV [email protected] 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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0
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0
answers
278
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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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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 from ...
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0
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1
answer
226
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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 ...
- 705
0
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0
answers
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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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0
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1
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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 ...
user98645
0
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0
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898
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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 ...
0
votes
0
answers
808
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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 ...
0
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0
answers
3k
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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 ...
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