[Libav-user] AVUtil memory leaks

[Tomislav Timic]

I was observing my application that is doing transcoding of mpegts over udp
and I noticed that constantly after each create of transcoder pipeline and
delete of pipeline i get small leaks from avutil.
[image: Screenshot 2025-05-12 at 11.00.07.png]
This is how i release input format context

if (formatCtx != nullptr)
{
    avformat_close_input(&formatCtx);
    avformat_free_context(formatCtx);
    formatCtx = nullptr;
}

This is how i release decoder

if (frame != nullptr)
{
    av_frame_free(&frame);
    frame = nullptr;
}

if (videoCodecCtx != nullptr)
{
    if (videoCodecCtx->codec != nullptr &&
        videoCodecCtx->codec->capabilities & AV_CODEC_CAP_ENCODER_FLUSH)
    {
        avcodec_flush_buffers(videoCodecCtx);
    }
    avcodec_free_context(&videoCodecCtx);
    videoCodecCtx = nullptr;
}

if (audioCodecCtx != nullptr)
{
    if (audioCodecCtx->codec != nullptr &&
        audioCodecCtx->codec->capabilities & AV_CODEC_CAP_ENCODER_FLUSH)
    {
        avcodec_flush_buffers(audioCodecCtx);
    }
    avcodec_free_context(&audioCodecCtx);
    audioCodecCtx = nullptr;
}

and this is how i release encoder and muxer

if (codecCtx != nullptr)
{
    avcodec_free_context(&codecCtx);
    codecCtx = nullptr;
}

if (encodePkt != nullptr)
{
    av_packet_free(&encodePkt);
    encodePkt = nullptr;
}

if (packet != nullptr)
{
    av_packet_free(&packet);
    packet = nullptr;
}

for (auto formatCtx: muxFormatCtx)
{
    if (formatCtx != nullptr)
    {
        av_write_trailer(formatCtx);

        if (!(formatCtx->oformat->flags & AVFMT_NOFILE))
        {
            avio_closep(&formatCtx->pb);
        }

        avformat_free_context(formatCtx);
        formatCtx = nullptr;
    }
}
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