2016-09-07 14:59 GMT-03:00 Henry, David <david.he...@echostar.com>: > On 9/6/16, 11:23 AM, "Libav-user on behalf of Leandro Raffo" > <libav-user-boun...@ffmpeg.org on behalf of ljra...@gmail.com> wrote: > > >>I'm trying to remux a video changing its frame rate, but I'm a bit >>lost in how to do it. This is what I have in mind: >>Suppose I have a 20 fps video and I want to take it for example to 10 >>fps, should I drop every second frame (paket) and JUST multiply the >>dts and pts by 2. >> >>What if I want to go 3 or 7 or 13 fps? I'm guessing I should be >>rescaling the dts and pts using the input_stream time_base or >>avg_frame_rate to get something reliable, but I don't know how! > > To change the frame rate, you must first decode the video frames as you > receive them. Don¹t throw away > The AVPacket before decoding to an AVFrame. After decoding, you can throw > away every other frame > Or whatever you decide based on your frame rate. You don¹t need the dts > after decoding. Don¹t > Change the pts because it¹s the presentation timestamp and you want to > display the frame in the > Same place in the timeline, only fewer frames. > > David Henry > > _______________________________________________ > Libav-user mailing list > Libav-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/libav-user
I see, but I wanted to avoid doing a decode/encode stage. Guess its not possible then. _______________________________________________ Libav-user mailing list Libav-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/libav-user
