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0
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1answer
15 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
15 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
32 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
19 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 ...
2
votes
2answers
90 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
13 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
254 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
505 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
281 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
407 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 ...
7
votes
3answers
1k 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
299 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
243 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
0answers
398 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 ...
5
votes
2answers
5k 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 ...
4
votes
1answer
4k 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 ...