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1
vote
1answer
30 views

Convert video changing only bitrate

I have a mediaplayer program which lags playing one specific file. My assumption is that it is because of too high video bitrate (41.3 Mbps) and too slow CPU (it is embedded system). So, I want to be ...
1
vote
0answers
71 views

Avconv Error when trying to save an updating snapshot of an IP-camera stream

I'm trying to save an updating image of my camera stream on my Desktop. avconv -i rtsp://admin:12345@192.168.1.199/h264 -f image2 -r 1 /home/nuc/Images/img.jpg Protocol avconv version ...
1
vote
0answers
134 views

How to record vfl webcam with ffmpeg? Cannot find a proper format for codec 'none'

Goal is to capture video from my old usb webcam (device 0733:0430). Trying to save video gives this error. (I've tried both ffmpeg and avconv.) Command ffmpeg -f v4l2 -i /dev/video2 -s 160x120 ...
0
votes
1answer
64 views

Slow down mp3 audio

I love VLC's option of slowing down audio playback. Now I want to take my mp3-files to a portable player and play them there. Unfortunately the player does not have a slow down option. How can I ...
2
votes
1answer
84 views

Cutting an AV file (MP4)

I have tried using openshot, pitivi, kdenlive, videolan to cut an audio/video file but they all seem to freeze. So I am now trying to use the following command: avconv -i input.MP4 -vcodec copy ...
2
votes
2answers
311 views

Is there any equivalent to the atempo ffmpeg audio filter but for avconv to speed up video(and audio)?

As noted here, we could speedup audio with ffmpeg using ffmpeg -i input.mkv -filter:a "atempo=2.0" -vn output.mkv But on Ubuntu, ffmpeg is replaced by avconv, and the atempo filter is not available ...
1
vote
0answers
312 views

avconv stops streaming after some time

I am using raspberry-pi board and a usb camera attached with it. i use avconv tool to capture live video from camera and streaming it on network using rtp protocol. My command on server(raspberry-pi ...
3
votes
0answers
236 views

avconv: converting raw mjpeg video to a viewable format

I'm using a Beaglebone Black (BBB) with a USB Webcam attached to it. The BBB is running the latest Angstrom release. At the moment, it is proving difficult for me to convert video that I capture to ...
1
vote
0answers
47 views

How can I add a still image inside a video with avconv or opensource software

I would like to add a still image inside a h264 video following an in and out point in time. I would like to use only opensource/free Linux/Debian packages. I tried a lot of things with avconv like ...
0
votes
0answers
222 views

avconv error: av_interleaved_write_frame

I use avconv to cut a video and to remove subtitles. Depending on the length of the output video, I get a success or and error. The input video has the following information: avconv -i video.mkv ...
2
votes
0answers
63 views

Jitter while screen recording with avconv

I've figured out how to record decent quality with avconv now, the problem that remains which I also have experienced with ffmpeg and recordmydesktop is that my desktop background keeps flickering ...
1
vote
1answer
901 views

How do I `avconv` every m4a in a dir to mp3s?

So I'm trying to convert lots of m4as to mp3s, and I think the best way to do that is using avconv. The problem is, I can't seem to find any solid examples on how to use avconv. Looking at the man ...
1
vote
0answers
33 views

Can't stream both audio sources, only mic works

Why does the following code not stream both audio sources? #!/bin/bash INRES="1920x1080" OUTRES="1280x720" FPS="20" QUAL="medium" STREAM_KEY=$(cat ~/.twitch_key) avconv -g 0 \ -f x11grab -s $INRES ...
0
votes
0answers
218 views

How to convert a video file from mp4 to mp2

I have been searching a lot and I can't find a solution. How do you convert a video from MPEG-4 to MPEG-2? That shouldn't be too hard. But the avconv man pages don't give enough info to do this ...
0
votes
0answers
80 views

How can I use codecs etc. from one file to encode another with avconv?

I'm trying to use my camcorder as a portable TV, so I would like to use files from the camcorder (a Sony Handycam HDR-CX280) to encode my other video files in a format it will play. Here's the output ...
3
votes
2answers
914 views

Interactively concatenate video files

Problem : How to concatenate (join) multiple MP4 video files into one file interactively? There are a lot of programs that do this for two files from the command line. For instance : ffmpeg, ...
0
votes
0answers
25 views

avconv with negative audio quality value

Is it possible to set the -q:a parameter to a negative value? For example, the value of -1 is a valid quality level for the Vorbis codec.
2
votes
1answer
855 views

Compare video and image (percentage of differences)

I was wondering if it's possible to get the percentage of difference between a video and an static image using avconv (from libav) I have a surveillance camera constantly providing an RTSP video ...
3
votes
1answer
2k views

Convert images into avi with Raspberry Pi

I'm following this page: Creating Timelapse Videos With The Raspberry Pi Camera. But every time I try to make the video, I get this error: original: http://i.imgur.com/VLJrK8q.png Specifically ...
2
votes
3answers
663 views

avconv creates creates files whose duration is incorrect

I am attempting to create a variable rate mp3 from a flac using the following command: avconv -i t.flac -id3v2_version 3 -vn -acodec libmp3lame -aq 0 t.mp3 avconv and mediainfo both list the ...
3
votes
1answer
913 views

how to use avconv to record streaming audio (how to define sources)?

I have never used avconv before. I've been reading the manual and asking questions on various forums and IRC for the last couple weeks but I have not found an answer yet. (This question is one part of ...
11
votes
3answers
4k views

How to get near-perfect screen recording quality?

Someone suggested I direct a copy of the unmodified X display to a file and afterwards convert that file to a general purpose video file. What commands would I use to do this on a Kubuntu system? ...
1
vote
0answers
490 views

How to make CD-quality WAV files using avconv?

I want to make a CD using the audio tracks of some video clips. I was thinking of using avconv to convert the files. As far as the other steps go, I found some instructions on the Arch Wiki. This is ...
2
votes
1answer
297 views

tmpfs performance

I use avconv to make screen recording of gameplays on linux (yeah, I'm sorry, I am one of them, but I get more excited about the scripts than playing it self), but recently my harddrive has gone and ...
3
votes
1answer
552 views

how to merge two audio input source using avconv

I try to make screencast using avconv and I facing a problem. I finally succeed to record both pc output and microphone input , the problem is that they're not merged in the output file. (I saw ...
6
votes
2answers
7k views

Downsampling a video with avconv / ffmpeg

I know really little about encoding and using avconv / ffmpeg. I am trying to downsample a video as follows: avconv -i blah_in.avi -s 640x360 -pass 1 blah.avi avconv -i blah_in.avi -s 640x360 -pass 2 ...
5
votes
1answer
5k views

How to splice sections of a video with avconv?

I have figured out so far that you can cut a section from a video with avconv with a command like this (cuts from 1:00-3:00): avconv -ss 00:01:00 -i "input.avi" -t 00:02:00 -c:v libx264 -crf 23 ...