Tagged Questions

1
vote
1answer
53 views

Avconv Can not resample 6 channels

I'm getting a message, that it cannot resample 6 channels into 2 channel audio. This is the command i'm using to convert into h.264+aac: avconv -i ...
2
votes
1answer
146 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 ...
1
vote
1answer
165 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 ├── ...
1
vote
0answers
122 views

Simplest video grab from webcam: how to

On Raspbery Pi's Raspbian (based on Debian Wheezy) I'm trying to make a simplest video grab from a Logitech C910 webcam to a video file via ffmpeg/avconv. I say: $ avconv -t 5 -f video4linux2 -s ...
2
votes
1answer
131 views

Stream/record desktop, mic and system output

Im try to stream my desktop, and two audio: system output, and mic. Im using this command, but the audio from my system (hw:0,0) dont hear in output file... avconv \ -f alsa -i pulse \ -f alsa -i ...
1
vote
1answer
91 views

How do I recompile libav on ubuntu 12.04 without breaking anything

I have a "Little" script for screencasting - I'll skip to the good part. In my avconv command I record 3 different sources simultaneously to 3 different tracks. The only way I know of getting audio ...
2
votes
1answer
245 views

how to record/stream multiple audio output from a single input?

This is the command I am currently using to stream live audio under the Raspbian distro: ffmpeg -f alsa -ac 1 -i hw:1 -ar 44100 -f flv rtmp://10.255.11.53/ The functionality I am looking for is ...
3
votes
0answers
203 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 ...
1
vote
1answer
258 views

User Generated Chroma Key Composite Videos with FFMPEG / AVCONV

I want to create a system where a user can upload two videos to a website, one of which has blue screen in the background, and the website uses AVCONV (or similar) to create a composite video of the ...
2
votes
2answers
1k views

Resizing videos with ffmpeg/avconv to fit into static sized player

I have a html 5 video player which is 700px wide, 400px high. I'm trying to use avconv to use ffmpeg to resize (while retaining the aspect ratio) and making sure it fits into my player. Input can be ...
3
votes
1answer
173 views

A way to capture error output from ffmpeg/avconv in a bash script

I am trying to batch convert a bunch of files and i am doing an simple listing of the converted files to a text document so that i can stop the script and continue from approximately were i started. ...
0
votes
2answers
221 views

X Error of failed request: BadCursor (invalid Cursor parameter) when recording Xvfb with ffmpeg/avconv

I am trying to record video output from Xvfb using ffmpeg or avconv. I start Xvfb with: $ Xvfb :29 -screen 0 1024x768x24 When I later try to record display :29 with avconv (same output for ffmpeg): ...
0
votes
1answer
107 views

Only video playback not working for Xbox using uShare

I have been mucking around with video encode for a while now using Handbrake without any success. (just recently tried EncodeHD on a Windows machine with no luck) So far all music and pictures play ...
6
votes
2answers
8k views

libav vs ffmpeg - better to use libav (avconv) today?

From what I've seen it looks to me like libav 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 should I choose it ...
2
votes
0answers
161 views

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, ...
2
votes
0answers
1k views

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 ...
0
votes
0answers
856 views

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 ...
1
vote
2answers
3k views

Using avconv (ffmpeg) to concatenate a bunch of .bmps into a mkv/avi video

Trying to figure out how to get avconv to concatenate a bunch of .bmps together into a video file. Here's what I've got so far: avconv -f image2 -i Capture/%d.bmp -vcodec mpeg4 -r 24 -b:v 20M ...