我如何在ffmpeg写帧方法中释放pkt

本文介绍了我如何在ffmpeg写帧方法中释放pkt的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述问候我正在查看一个ffmpeg源代码示例： http：// svn.perian.org/ffmpeg/ffmpeg.c [ ^ ] 在代码中，我专注于编写视频帧的方法。这是方法： GreetingsI'm looking at an ffmpeg source code example at :http://svn.perian.org/ffmpeg/ffmpeg.c[^]In the code, I'm focusing on a method that writes the video frame.Here is that method:static void write_frame(AVFormatContext *s, AVPacket *pkt, AVCodecContext *avctx, AVBitStreamFilterContext *bsfc){ int ret; while(bsfc){ AVPacket new_pkt= *pkt; int a= av_bitstream_filter_filter(bsfc, avctx, NULL, &new_pkt.data, &new_pkt.size, pkt->data, pkt->size, pkt->flags & AV_PKT_FLAG_KEY); if(a>0){ av_free_packet(pkt); new_pkt.destruct= av_destruct_packet; } else if(a<0){ fprintf(stderr, "%s failed for stream %d, codec %s", bsfc->filter->name, pkt->stream_index, avctx->codec ? avctx->codec->name : "copy"); print_error("", a); if (exit_on_error) exit_program(1); } *pkt= new_pkt; bsfc= bsfc->next; } ret= av_interleaved_write_frame(s, pkt); if(ret < 0){ print_error("av_interleaved_write_frame()", ret); exit_program(1); }} 如果我按原样测试代码，我会在写入时遇到崩溃 ret = av_interleaved_write_frame（s，pkt）; 但是如果我评论我们的// av_free_packet（pkt）; 它工作正常，这就是问题，直到一段时间后，内存变得非常大。我怀疑它是因为我已经注释掉了 av_free_packet（pkt）关于为什么我会崩溃原始代码的任何想法（使用av_free_packet（pkt）））？If I test the code as is, I get a crash at the write "ret= av_interleaved_write_frame(s, pkt);"But if I comment our the //av_free_packet(pkt);It works fine, and here is the problem, until after a while, memory grows very very large.I suspect it's because I've commented out the av_free_packet(pkt)Any ideas as to why I crash with the original code (with av_free_packet(pkt))?推荐答案好吧，我终于让它工作了，并将在这里发布我的特定解决方案，希望它可以帮助别人。哦，差点忘了。如果您有更改此代码的建议，请执行以下操作： Well, I did finally get it working and will post my particular solution here with the hope it may help others. Oh, almost forgot. If you have a suggestion for change to this code, please do:static void write_frame(AVFormatContext *s, AVPacket *pkt, AVCodecContext *avctx, AVBitStreamFilterContext *bsfc){ int ret; while(bsfc){ AVPacket new_pkt= *pkt; int a= av_bitstream_filter_filter(bsfc, avctx, NULL, &new_pkt.data, &new_pkt.size, pkt->data, pkt->size, pkt->flags & AV_PKT_FLAG_KEY); if(a>0){ //av_free_packet(pkt);//-comment this out if (new_pkt.data != pkt->data)//-added this { av_free_packet(pkt); pkt->data = new_pkt.data; pkt->size = new_pkt.size; pkt->destruct = av_destruct_packet; } new_pkt.destruct= av_destruct_packet; } else if(a<0){ fprintf(stderr, "%s failed for stream %d, codec %s", bsfc->filter->name, pkt->stream_index, avctx->codec ? avctx->codec->name : "copy"); print_error("", a); if (exit_on_error) exit_program(1); } <b>// *pkt= new_pkt;//-comment this out</b> bsfc= bsfc->next; } ret= av_interleaved_write_frame(s, pkt); av_free_packet(pkt);//-added here av_bitstream_filter_close(bsfc);//-added here if(ret < 0){ print_error("av_interleaved_write_frame()", ret); exit_program(1); }}</pre> AVPacket new_pkt = pkt;int a = av_bitstream_filter_filter(m_bsfDecoderContext, out_stream->codec,NULL,&new_pkt.data,&new_pkt.size,pkt.data,pkt.size,pkt.flags & AV_PKT_FLAG_KEY);av_free_packet(&pkt);pkt.data = new_pkt.data;pkt.size = new_pkt.size;if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0)break;av_free(new_pkt.data); 这篇关于我如何在ffmpeg写帧方法中释放pkt的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！