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• avformat/segment : Fix leak of string on error

  5 septembre 2020, par Andreas Rheinhardt

  avformat/segment : Fix leak of string on error
  A string containing the segment's filename that the segment muxer
  
  allocates got only freed in its write_trailer function. This implies
  
  that it leaks if write_trailer is never called, e.g. if initializing
  
  the child muxer fails. This commit fixes this by freeing the string
  
  in the deinit function instead.
  Reviewed-by : Ridley Combs <rcombs@rcombs.me>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/segment.c

• lavf/vf_framerate : Fix frame leak when increasing framerate.

  11 mars 2017, par Alexis Ballier

  lavf/vf_framerate : Fix frame leak when increasing framerate.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/vf_framerate.c

• Memory leak using FFmpeg

  3 août 2020, par kichma

  I found out that my application has a memory leak coming from a C++ function. It seems this function is called for each frame and it leak is proportional to the size of a frame. It's called from a python code but the leak is somewhere in the C++ code.
  
I don't have much experience with ffmpeg or C++ and I'm not author of this code. Does anyone see what is causing leak here or can provide some advice how to debug this ? I tried to use the code (windows part) from this answer https://stackoverflow.com/a/64166/10046424 to find which part of the code uses memory but I always got 0.

  


   static py::object video_encode_frame(py::object self)   
{

    video_encode_helper *vec = py::cppobject < video_encode_helper > (self.attr("_encoder_state")).value();

    int image_id = 0;
    RTIConfig rti;
    ViewerBase *bs = base(self);
    Py_BEGIN_ALLOW_THREADS;
    renderToExistingImage(&rti, vec->img_key, image_id, bs, vec->c->width, vec->c->height);
    Py_END_ALLOW_THREADS;

    static int i = 0;
    float dummy;
    int h, w;
    char buf[MVO_BUFFER_SIZE];

    HC_Show_Image(vec->img_key, &dummy, &dummy, &dummy, buf, &w, &h, vec->data);
    struct SwsContext *sws_ctx = sws_getContext(vec->c->width, vec->c->height, PIX_FMT_RGB24,
                                                vec->c->width, vec->c->height, (PixelFormat) vec->picture->format,  
                                                SWS_FAST_BILINEAR, NULL, NULL, NULL);

    int src_linesize[] = { vec->c->width * 3, 0, 0, 0 };
    const uint8_t *src_data[] = { (const uint8_t *) vec->data, 0, 0, 0 };
    sws_scale(sws_ctx, (const uint8_t * const *) src_data, src_linesize, 0, vec->c->height, vec->picture->data,
              vec->picture->linesize);
    sws_freeContext(sws_ctx);

    int repeat = vec->FPS / vec->TPS;
    if (repeat == 0)
        repeat = 1;


    int ret = -1;

    AVPacket pkt = { 0 };
    int got_packet;
    av_init_packet(&pkt);

    /* encode the image */
    ret = avcodec_encode_video2(vec->c, &pkt, vec->picture, &got_packet);
    if (ret < 0) 
        return py::bool_(false);

    for (int r = 0; r < repeat; r++) {
        /* If size is zero, it means the image was buffered. */
        if (!ret && got_packet && pkt.size) {
            pkt.stream_index = vec->video_st->index;

            /* Write the compressed frame to the media file. */
            ret = av_interleaved_write_frame(vec->oc, &pkt);

        } else
            ret = 0;

        vec->picture->pts += av_rescale_q(1, vec->video_st->codec->time_base, vec->video_st->time_base);
        vec->frame_count++;
        }
    return py::bool_(true);
}


  


  There is also a cleanup function that is called at the end. Perhaps something should be deallocated there ?

  


  static py::object video_encode_finalize(py::object self)
{
    if (self.attr("_encoder_state") == py::none())
        return py::bool_(false);

    video_encode_helper *vec = py::cppobject < video_encode_helper > (self.attr("_encoder_state")).value();

    /* Write the trailer, if any. The trailer must be written before you
     * close the CodecContexts open when you wrote the header; otherwise
     * av_write_trailer() may try to use memory that was freed on
     * av_codec_close(). */
    av_write_trailer(vec->oc);
    /* Close each codec. */

    avcodec_close(vec->video_st->codec);
    av_freep(&(vec->picture->data[0]));
    av_free(vec->picture);

    if (!(vec->fmt->flags & AVFMT_NOFILE))
        /* Close the output file. */
        avio_close(vec->oc->pb);

    /* free the stream */
    avformat_free_context(vec->oc);

    vec->initialized = false;
    vec->frame_count = 0;

    return py::bool_(true);
}