Hi Grzegorz Thanks for introducing the useful links, it takes a little time to see weather it useful for my purpose (extracting frames) or not. regarding using sws_scale, i just wanted to know does it convert the MPEG-4 format to raw formats: YUV or RGB? it seems this tools work for converting YUV to RGB Regards Amir
On Thu, Apr 7, 2011 at 11:00 AM, Grzegorz Szpetkowski < [email protected]> wrote: > I am not FFmpeg API expert, but you can find working example > (avcodec_sample.0.5.0.c) at > > http://web.me.com/dhoerl/Home/Tech_Blog/Entries/2009/1/22_Revised_avcodec_sample.c.html > > There are also two guides that I know: > http://www.inb.uni-luebeck.de/~boehme/using_libavcodec.html (very > outdated) > http://dranger.com/ffmpeg/tutorial01.html (little outdated) > > To convert AVFrame from YUV to RGB you need to use sws_scale. > > Regards > Grzegorz Sz. > > 2011/4/7 Amir Rouhi-Rmit <[email protected]>: > > Hi > > > > I would be pleased if somebody guide me how can I extract frames in > I-Frame > > format from a MPEG-4 AVC (H.264) video stream. The I-Frame can be: > > > > A- Any selected frame which can be extracted in form of a 1 frame video > > file. In this case the only frame of video should be in I-Frame. > > > > B- Extracting real I-Frames that exist in a video stream in form of 1 > frame > > video files. > > > > > > > > I found a method myself for type A, which is based on converting video to > > RAW format by YUVTOOLS software(If somebody help me that how can I > convert > > the video to YUV or RGB by ffmpeg or any free software I would be > pleased) , > > and then I select any frame by its number and extract it as a 1 frame > video > > which is in I-Frame format by JM software. As you have noticed , this > method > > is very costy and take a long time. I hope by help of you I find a method > in > > ffmpeg filters to do that. > > > > Regards > > > > Amir > > > > _______________________________________________ > > Libav-user mailing list > > [email protected] > > http://ffmpeg.org/mailman/listinfo/libav-user > > > > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user >
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