<div dir="ltr"><div class="gmail_default" style="color:#000099">Hi All,<br></div><div class="gmail_quote"><div dir="ltr"><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)">Following is the code snippet that I am reusing from remuxing.c, but when I convert an image from YUV to RGB and again back to YUV, there are some glitches added to the video stream on the frames that went for conversion, rest of the frames are fine.<br></div><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)">Please let me know what I am missing or how this can be achieved in a different way without any glitches. FFmpeg version is 2.6.2</div><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)"> //Allocation for RGB frame</div><div><div><span style="color:rgb(0,0,153)"><br></span></div><div><span style="color:rgb(0,0,153)"> frame_rgb = av_frame_alloc();</span><br></div><div><font color="#000099"> if (!frame_rgb) {</font></div><div><font color="#000099"> goto end;</font></div><div><font color="#000099"> }</font></div></div><div style="color:rgb(0,0,153)"><br></div><div><div><font color="#000099"> </font><span style="color:rgb(0,0,153)">num_bytes = avpicture_get_size(PIX_FMT_RGB24, in_vcodec_ctx->width,</span></div><div><font color="#000099"> in_vcodec_ctx->height);</font></div><div><font color="#000099"><br></font></div><div><font color="#000099"> buffer_rgb = (uint8_t *)av_malloc(num_bytes * sizeof(uint8_t));</font></div><div><font color="#000099"><br></font></div><div><font color="#000099"> </font><span style="color:rgb(0,0,153)">avpicture_fill((AVPicture *)frame_rgb, buffer_rgb, PIX_FMT_RGB24,</span></div><div><font color="#000099"> in_vcodec_ctx->width, in_vcodec_ctx->height);</font></div></div><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)"><div> //Allocation for YUV frame</div><div><br></div><div style="color:rgb(34,34,34)"><div><font color="#000099"> frame_yuv = av_frame_alloc();</font></div><div><font color="#000099"> if (!frame_yuv) {</font></div><div><font color="#000099"> goto end;</font></div><div><font color="#000099"> }</font></div><div><font color="#000099"><br></font></div></div></div><div><div><font color="#000099"> num_bytes = avpicture_get_size(in_vcodec_ctx->pix_fmt, in_vcodec_ctx->width,</font></div><div><font color="#000099"> in_vcodec_ctx->height);</font></div><div><font color="#000099"><br></font></div><div><font color="#000099"> buffer_yuv = (uint8_t *)av_malloc(num_bytes * sizeof(uint8_t));</font></div><div><font color="#000099"><br></font></div><div><span style="color:rgb(0,0,153)"> avpicture_fill((AVPicture *)frame_yuv, buffer_yuv, in_vcodec_ctx->pix_fmt,</span><br></div><div><font color="#000099"> in_vcodec_ctx->width, in_vcodec_ctx->height);</font></div><div><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)"> //Allocation of SWS context</div><div style="color:rgb(0,0,153)"><br></div></div><div><font color="#000099"><div> sws_rgb_ctx = sws_getContext(in_vcodec_ctx->width, in_vcodec_ctx->height,</div><div> in_vcodec_ctx->pix_fmt,</div><div> in_vcodec_ctx->width, in_vcodec_ctx->height,</div><div> PIX_FMT_RGB24,</div><div> SWS_BICUBIC, NULL, NULL, NULL);</div><div><br></div><div> sws_yuv_ctx = sws_getContext(in_vcodec_ctx->width, in_vcodec_ctx->height,<br></div><div> PIX_FMT_RGB24,</div><div> in_vcodec_ctx->width, in_vcodec_ctx->height,</div><div> in_vcodec_ctx->pix_fmt,</div><div> SWS_BICUBIC, NULL, NULL, NULL);</div><div><br></div><div><div> for( ;; ) {</div><div><br></div><div> ret = av_read_frame(ifmt_ctx, &pkt_in);</div><div> if (ret < 0)</div><div> break;</div><div><br></div><div> in_stream = ifmt_ctx->streams[pkt_in.stream_index];</div><div> out_stream = ofmt_ctx->streams[pkt_in.stream_index];</div><div><br></div><div> /* Process only video stream packets */<br></div><div> if (pkt_in.stream_index == video_stream_idx) {</div><div><br></div><div> /* Decode video frame */</div><div> avcodec_decode_video2(in_vcodec_ctx, frame_yuv, &frame_finished, &pkt_in);</div><div><br></div><div> /* Process completed video frame and preferred type frame */</div><div> if (frame_finished && AV_PICTURE_TYPE_I == frame_yuv->pict_type) {</div><div><br></div><div> /* Convert the image from its native format to RGB */</div><div> sws_scale</div><div> (</div><div> sws_rgb_ctx,</div><div> (uint8_t const * const *)frame_yuv->data,</div><div> frame_yuv->linesize,</div><div> 0,</div><div> in_vcodec_ctx->height,</div><div> frame_rgb->data,</div><div> frame_rgb->linesize</div><div> );</div><div><br></div><div> // perform necessary image modification</div><div><br></div><div> /* Convert the image from RGB to input native format */</div><div> sws_scale</div><div> (</div><div> sws_yuv_ctx,</div><div> (uint8_t const * const *)frame_rgb->data,</div><div> frame_rgb->linesize,</div><div> 0,</div><div> in_vcodec_ctx->height,</div><div> frame_yuv->data,</div><div> frame_yuv->linesize</div><div> );</div></div><div><br></div><div><div> av_init_packet(&pkt_yuv);</div><div><br></div><div> /* packet data will be allocated by the encoder */</div><div> pkt_yuv.data = NULL;</div><div><br></div><div> /* encode the image */<br></div><div> ret = avcodec_encode_video2(out_stream->codec, &pkt_yuv, frame_yuv, &got_frame);</div><div> if (ret < 0) {</div><div> fprintf(stderr, "Error encoding frame\n");</div><div> break;</div><div> }</div><div><br></div><div> if (got_frame) {</div><div><br></div><div> /* copy packet */</div><div> pkt_yuv.pts = av_rescale_q_rnd(pkt_in.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);</div><div> pkt_yuv.dts = av_rescale_q_rnd(pkt_in.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);</div><div> pkt_yuv.duration = av_rescale_q(pkt_in.duration, in_stream->time_base, out_stream->time_base);</div><div> pkt_yuv.pos = -1;</div><div><br></div><div> ret = av_interleaved_write_frame(ofmt_ctx, &pkt_yuv);<br></div><div> if (ret < 0) {</div><div> fprintf(stderr, "Error muxing packet\n");</div><div> break;</div><div> }</div></div><div><br></div><div><div> av_free_packet(&pkt_yuv);</div><div> av_free_packet(&pkt_in);</div><div><br></div><div> continue;</div><div> }</div><div> else {</div><div> fprintf(stdout, "No output for encoded packet\n");</div><div><br></div><div> av_free_packet(&pkt_yuv);</div><div> }</div><div> }</div><div> }</div><div><br></div><div> /* copy packet */</div><div> pkt_in.pts = av_rescale_q_rnd(pkt_in.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);</div><div> pkt_in.dts = av_rescale_q_rnd(pkt_in.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);</div><div> pkt_in.duration = av_rescale_q(pkt_in.duration, in_stream->time_base, out_stream->time_base);</div><div> pkt_in.pos = -1;</div><div><br></div><div> ret = av_interleaved_write_frame(ofmt_ctx, &pkt_in);<br></div><div> if (ret < 0) {</div><div> fprintf(stderr, "Error muxing packet\n");</div><div> break;</div><div> }</div><div><br></div><div> av_free_packet(&pkt_in);</div><div> }</div></div></font></div></div><div style="color:rgb(0,0,153)"><br></div><div style="color:rgb(0,0,153)">Regards,</div><div style="color:rgb(0,0,153)">Sethu</div></div>
</div><br><div><div class="gmail_default" style="color:rgb(0,0,153)">P.S: Missed subject on earlier email.</div><br></div></div>