[FFmpeg-user] Cannot capture audio in screen recording

2018-09-09 Thread Abhijit Nathwani
Hi, I have been trying to record screen with audio using ffmpeg but I do not find any audio in the output file. The video file properties has some audio buffers but still no audio on the speakers. I have followed this guide to capture the ALSA audio. https://trac.ffmpeg.org/wiki/Capture/ALSA Fol

[FFmpeg-user] Zoom out/scale down dynamically

2018-09-09 Thread astian
Hello, I want to dynamically (per frame) zoom out/scale down a video below 100% size. It seems that the zoompan filter would be ideal for this case, but unfortunately it clamps the zoom ratio to [1,10], that is, it only zooms in/scales up. Why? And what can I use instead? Thanks. __

Re: [FFmpeg-user] Detecting signal change on Decklink devices

2018-09-09 Thread Reuben Martin
On Sunday, September 9, 2018 5:53:03 PM CDT Chris Bisset wrote: > Is there a better method of detecting a signal change? I do not need ffmpeg > to gracefully handle it (I am OK with stopping and restarting when this > happens), but I do need a way to catch when a different input is plugged in. The

[FFmpeg-user] Detecting signal change on Decklink devices

2018-09-09 Thread Chris Bisset
Hi, I’ve done some searching, but can’t seem to find an answer for this. If I set up a stream in ffmpeg with a decklink card as the source (autodetecting input), that works fine. If I then change the source (from 1080p30 to 1080p25, for example), the stream continues as a colour bar (as if the s

Re: [FFmpeg-user] remap filter gives only black and white output

2018-09-09 Thread Paul B Mahol
On 8/24/18, Shaji stellaton wrote: > Hello, > > I want to report a functionality regression. > > In version 3.3.2 remap filter gives out colored output for yuv420p but in > katest version ut gives out black and white for yuv420p. > > The command used in both versions is: > > ffmpeg -y -stream_loop

[FFmpeg-user] Symmetric RTP / socket reuse flag

2018-09-09 Thread Renaud Schoonbroodt
Hi everyone, I am implementing a SIP user agent (softphone) in C++ where the media encoding and decoding is handled by ffmpeg. I basically have one PCMU encoder and one PCMU decoder. Taken separately they both works fine. To cope with NAT traversal issues, I need to do Symmetric RTP https://tool