On Wed, Apr 25, 2018 at 4:25 PM Devin Heitmueller < dheitmuel...@kernellabs.com> wrote:
> Hi John, > > On Wed, Apr 25, 2018 at 5:11 PM, John P Poet <jpp...@gmail.com> wrote: > > I am working on a project where I need to insert a repeating image (10 > > seconds) in the middle of a video stream while also transcoding from one > > video codec to another. The images are going to be either png or jpg > > images. I have a frame number within the video stream which tells me > where > > to insert the sequence of image frames. > > This feels like a case where you might be better off with a video > filter that takes two inputs rather than modifying ffmpeg.c. The > filter would normally pass through the AVFrames from the first input, > except when you hit the appropriate timestamp, at which point it would > switch to the other input for some period. > > Look at the overlay filter as an example. > Hi Devin, I would love to see some code which does this. Google has not been kind. I find lost of examples of doing it from the command line, but I need to do this pragmatically since the points I insert the image can be updated in "real time" while transcoding the video. > > Alternatively, the filter could take the image to insert as a filter > argument, use libavformat/avcodec to decode it once, and then your > pipeline would be relatively standard. I believe there are some > examples that do that (look at the filters page and look for entries > that take a jpg/png as a filter argument). > The image will be know ahead of time, so I like this option. It would be much more efficient. When you say "look at the filters page", What page is that? I have had a hard time finding examples of this kind of operation. When I do find an example, I usually discover it is for a previous "API" and uses deprecated functions. Thank you, John _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
