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.

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96 votes
3 answers
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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 a ...
Jamie Taylor's user avatar
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13 votes
1 answer
47k 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. ...
Srini's user avatar
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99 votes
3 answers
102k 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 ...
floriank's user avatar
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6 votes
2 answers
7k views

Make MKV file suitable for streaming with ffmpeg (or avconv) - how to move all metadata to beginning of file?

My question, I think, is pretty simple... Sometimes I like to download large MKV files from a webserver of mine, and play them back while they are downloading. However, if I do this on MKV files I've ...
Fredrick Brennan's user avatar
6 votes
1 answer
19k views

Non-monotonous DTS in output stream

Summary of the bug: Hello, I've created a network with the mininet simulator on ubuntu 14.04lts. In this network, I want to transfer video between two hosts. I used vlc in Sender host and I used ...
sana's user avatar
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5 votes
3 answers
15k 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 time. ...
dfordevy's user avatar
  • 137
0 votes
0 answers
898 views

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 ...
Thirumalai murugan's user avatar
0 votes
1 answer
2k views

Ffmpeg - save bmp file as different extension

I want to save a bmp file as 1.mp4 using Ffmpeg, how to achieve it? The question is very simple. I have some source file, lets call it source.png and I want to encode it as bmp, but to save it as a ...
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