Hi,all Is the function av_rescale_q() some differnet bettewn H264 and the MPEG4???
I had passed the same paramters, but the pkt.pts is different. pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base); Please help me!! Thanks for all of you!! 2011/4/18 Vincent,Wei <[email protected]> > Hi,all > > I am a new user of ffmpeg, I need to change the RTP packet to the avi > file,used the H264 encoder, so I read the code of output_example.c. And I > had tried to genrerate a test.avi file just like the example. > There are some question about the result: > (1) When I use the .avi as the extensions, it uesd the CODEC_ID_MPEG4 > as default , I had found that it is defined at the avienc.c line:562 > AVOutputFormat avi_muxer = { > ..... > CODEC_ID_MP2, > CODEC_ID_MPEG4, > ..... > }; > I had try to change it to the CODEC_ID_H264, but when I try to > genrerat the test.avi again, I found that it can't work rightly,error as > follow: > error, non monotone timestamps -368934881474191031 >= > -368934881474191031 > Error while writing video frame . > Why? > > (2) When I edit the output_example.c line:445 > fmt = guess_format("h264", filename, NULL); > I also set the .avi as the extensions, but it can't generate the avi > format file(alougth the file look like .avi extension name,but the format do > not fit the avi format standard). > It generate the file which fit the .264 file format ,so it is turly > encode as the h264, but I need the avi file. > > (3) The example is worked as the YUV420 as input data, but my data source > had already been encoded as H264(RTP packet payload), > I thought that I may not need to change the data to YUV first, it's > not efficient. > I means that if the data is already the encoded ,the > avcodec_encode_video() may not be called? If it is right,av_write_frame() > need what data as the input data ? raw h264 data ?or some others?? > > How can I use the ffmpeg to help me do the work? > > That is all, so many questions for all of you, please help me, thanks
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