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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26
votes
2answers
25k 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
5k 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. ...
34
votes
3answers
47k 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 ...
-2
votes
3answers
4k 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 ...
3
votes
3answers
4k views

Split MKV based on Chapters

I have a long MKV file which I want to split into its individual chapters. Running ffmpeg -i long.mkv gives me all the information about the chapters embedded in the file: Duration: 01:23:45.80, ...
0
votes
0answers
49 views

How to redirect video subtitles to pipe?

I am watching subtitled videos. I would like the subtitles to be sent to a pipe instead of being displayed on the video. The aim is to process the subtitle data with some other software, like sed, in ...
0
votes
0answers
615 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 ...