Hi Anfrew, I have the doc/examples programs compiled and running. I use the program demuxing.c to decode an AVI file. From the source code, it looks it calls its own subroutine decode_packet() to decode the next video or audio packet, and that subroutine calls avcodec_decode_video2()to decode the next frame. Now i want to encode this frames in h264; so how can i to pass video frames into avcodec_encode_video2? (i'm interested only in video and not audio frames). After this i want to write the packets into a file.h264.
Can you help me? Thanks Any suggestion is appreciated. Thanks 2013/11/22 Andrew Sherepenko <[email protected]> > Hello libav users! > > I try to remuxing MPEG-TS to MP4 container. > > MPEG-TS stores H.264 video and AC3 audio. I copy video context to the new > container, > but I have to transcode audio to MP3. > > > What I do: > 1. Read packet from input context; > 2. Decode packet to the frame; > 3. Resample audio (use swr_conwert() API method); > 4. Encode frame into packet; > 5. Write packet into output context. > > AC3 frame stores 1536 samples, and MP3 - only 1152. > In this case we have downsampling. I've found that swr_convert() buffered > unprocessed samples (1536 - 1152 = 384 samples per frame). > If I don't read buffered samples I don't have an audio in the and of the > movie. So I try to flush data from the swr buffer and encode it too. > I flush after every third input frame (384 * 3 = 1152 - we have one full > output extra frame). > In such scenario I have complete audio stream but it has a lot of strange > artifacts. > I've tried change PTS/DTS, rescale, etc., but it doesn't help (Or i have > audio that plays faster without artifacts , or normal audio speed with > artifacts). > > Also may be somebody knows can I use av_samples copy() without > swr_convert() in this case. > > I will be glad to any advice. > > Thank you. > WBR, > Andrew Sherepenko > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > -- Francesco Damato
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