libav MMAL Runtime Errors

[gudenau]

I compiled ffmpeg on my Raspbery Pi Zero. (Yes it took forever, but I could not get cross compiling working, different problem) When I run ffmpeg it outputs this:

ffmpeg version N-83120-ge7dec52 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.9.2 (Raspbian 4.9.2-10)
  configuration: --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-mmal --extra-cflags=-ftree-vectorize
  libavutil      55. 43.100 / 55. 43.100
  libavcodec     57. 72.100 / 57. 72.100
  libavformat    57. 62.100 / 57. 62.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 69.100 /  6. 69.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'

Then filtering the FFMPeg codecs with grep for h264 shows this:

ffmpeg version N-83120-ge7dec52 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.9.2 (Raspbian 4.9.2-10)
  configuration: --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-mmal --extra-cflags=-ftree-vectorize
  libavutil      55. 43.100 / 55. 43.100
  libavcodec     57. 72.100 / 57. 72.100
  libavformat    57. 62.100 / 57. 62.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 69.100 /  6. 69.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
 D.V.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_mmal )

Here is my code that uses libav, at the moment just attempting to decode the video and ignore the output.

#ifndef INBUF_SIZE
#define INBUF_SIZE 4096
#endif FF_INPUT_BUFFER_PADDING_SIZE
#ifndef FF_INPUT_BUFFER_PADDING_SIZE
#define FF_INPUT_BUFFER_PADDING_SIZE 32
#endif

int decode_frame(AVCodecContext *instance, AVFrame *frame, int *frameCount, AVPacket *packet){
    int length;
    int gotFrame;
   
    length = avcodec_decode_video2(instance, frame, &gotFrame, packet);
    assert(length >= 0);
   
    if(gotFrame){
        (*frameCount)++;
    }
    if(packet->data){
        packet->size -= length;
        packet->data += length;
    }
   
    return 0;
}

void initFFMPEG(void){
    // Register all the things
    av_register_all();
   
    AVPacket packet;
    av_init_packet(&packet);
   
    AVCodec *codec;
    codec = avcodec_find_decoder_by_name("h264_mmal");
    assert(codec);
   
    AVCodecContext *instance;
    instance = avcodec_alloc_context3(codec);
    assert(instance);
   
    assert(avcodec_open2(instance, codec, NULL) >= 0);
   
    FILE *file = fopen("/opt/vc/src/hello_pi/hello_video/test.h264", "rb");
    assert(file);
   
    AVFrame *frame;
    frame = av_frame_alloc();
    assert(frame);
   
    uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
    memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
   
    int frameCount = 0;
    for(;;){
        packet.size = fread(inbuf, 1, INBUF_SIZE, file);
        if(!packet.size){
            break;
        }
       
        packet.data = inbuf;
        while(packet.size > 0){
            assert(decode_frame(instance, frame, &frameCount, &packet) >= 0);
        }
    }
   
    packet.data = NULL;
    packet.size = 0;
    decode_frame(instance, frame, &frameCount, &packet);
   
    fclose(file);
   
    avcodec_close(instance);
    av_free(instance);
    av_frame_free(&frame);
}

The program outputs this:

mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
mmal: [h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
mmal_port_event_get: vc.ril.video_decode(1:0) port 0x2c91610, no event buffer left for ERRO
mmalipc: mmal_vc_handle_event_msg: no event buffer available to receive event (2)
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] MMAL error 2 on control port
[h264_mmal @ 0x2c903e0] Did not get output frame from MMAL.
test: src/main.c:243: decode_frame: Assertion `length >= 0' failed.
Aborted

And this is my makefile:

SOURCE            = src
BUILD            = build
BIN                = test

GCC                = gcc
LINKER            = gcc

INCLUDE_PATHS    = /opt/vc/include
LIBRARY_PATHS    = /opt/vc/lib /usr/lib/gcc/arm-linux-gnueabihf/4.9

SOURCES            = $(wildcard $(SOURCE)/*.c)
OBJECTS            = $(patsubst $(SOURCE)/%.c,$(BUILD)/%.o,$(SOURCES))

MMAL_LIBS        = mmal mmal_core mmal_components mmal_util mmal_vc_client
FFMPEG_LIBS        = avformat avcodec swresample avutil
LIBRARIES        = $(FFMPEG_LIBS) $(MMAL_LIBS) bcm_host pthread m z

CFLAGS            = -c $(addprefix -I,$(INCLUDE_PATHS)) -Wall
LFLAGS            = $(addprefix -l,$(LIBRARIES)) $(addprefix -L,$(LIBRARY_PATHS))

all: $(BIN)

clean:
    rm $(BIN) $(OBJECTS)

$(BIN): $(OBJECTS)
    $(LINKER) $^ $(LFLAGS) -o $@

$(BUILD)/%.o: $(SOURCE)/%.c dirs
    $(GCC) $(CFLAGS) $< -o $@

dirs:
    mkdir -p $(BUILD)

How can I fix this?