读取网络流丢包导致跳帧

if ((ret = avformat_open_input(&ifmt_ctx, video_source, 0, NULL)) < 0) {
av_log(NULL, AV_LOG_ERROR, "[nelson] -- Could not open %s Url \n", video_source);
goto end;
}
av_log(NULL, AV_LOG_ERROR, "[nelson] -- Open %s Url Success \n", video_source);

if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
av_log(NULL, AV_LOG_ERROR, "[nelson] -- Failed to retrieve input stream information \n");
goto end;
}

avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
if (!ofmt_ctx) {
av_log(NULL, AV_LOG_ERROR, "[nelson] -- Could not create output context \n");
ret = AVERROR_UNKNOWN;
goto end;
}

ofmt = ofmt_ctx->oformat;

av_log(NULL, AV_LOG_ERROR, "[nelson] -- Copy Streams Start \n");

for (int i = 0; i nb_streams; i++) {
// create output stream
AVStream *in_stream = ifmt_ctx->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
if (!out_stream) {
av_log(ffp, AV_LOG_ERROR, "record - Failed allocating output stream\n");
goto end;
}

// copy params to AVCodecContext
av_log(ffp, AV_LOG_DEBUG, "record - in_stream->codec；\n", in_stream->codec);
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
av_log(ffp, AV_LOG_ERROR, "record - Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
}

av_log(NULL, AV_LOG_ERROR, "[nelson] -- Copy Streams Success \n");

av_dump_format(ofmt_ctx, 0, out_filename, 1);

if (!(ofmt->flags & AVFMT_NOFILE)) {
ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR,"[nelson] -- Could not open output file '%s'", out_filename);
goto end;
}
}

ret = avformat_write_header(ofmt_ctx, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "[nelson] -- Error occurred when opening output file\n");
goto end;
}
int num = 0;
int recordFinished = 0;
while (isRecording(ffp,key)) {
ret = av_read_frame(ifmt_ctx, &pkt);
if (ret < 0)
break;
ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
av_log(NULL, AV_LOG_ERROR,"[nelson] -- Record %s Frame '%d' \n", out_filename, num++);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "[nelson] -- Error muxing packet\n");
break;
}
av_packet_unref(&pkt);
}

Start from the shown recording loop around av_read_frame and av_interleaved_write_frame, and reproduce the reported packet-loss behavior with a network stream. Trace how read or write errors affect frame handling and identify the relevant recording entry point in the repository. Done means the reported frame skipping is addressed and the recording path remains functional.

Written by the indexing model from the issue text.