*Hello!**
**I have a code for getting text string at each video frame
(intermediate testing)**
**but on frame 16 I got following messages:**
**
**[h264 @ 0x1c6d900] AVC: nal size 20971526**
**[h264 @ 0x1c6d900] no frame!**
**Error while decoding frame 16**
**
**ffmpeg info about video file is here:*
-------------------------------------------------------------------------
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
Duration: 00:04:19.32, start: 0.000000, bitrate: 3146 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 2999 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc
(default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 144 kb/s (default)
Metadata:
handler_name : IsoMedia File Produced by Google, 5-11-2011
-------------------------------------------------------------------------
*part of code is here :*
--------------------------------------------------------------------------------------------------------------
av_register_all();
const char *url = "video.mp4";
AVFormatContext *s = NULL;
int ret = avformat_open_input(&s, url, NULL, NULL);
if (ret < 0)
abort();
AVPacket cur_packet;
av_init_packet(&cur_packet);
AVFrame *avf=av_frame_alloc();
int got_picture;
int len;
int frame = 0;
uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
FILE *f = fopen(url, "rb");
AVCodec *codec;
AVCodecContext *c= NULL;
codec = avcodec_find_decoder(s->streams[0]->codec->codec_id);
if (!codec) {
fprintf(stderr, "codec not found\n");
exit(1);
}
c=s->streams[0]->codec;
s->streams[0]->codec->codec=codec;
if(codec->capabilities & CODEC_CAP_TRUNCATED)
c->flags|= CODEC_FLAG_TRUNCATED;
if (avcodec_open2(c, codec, NULL) < 0) {
fprintf(stderr, "could not open codec\n");
exit(1);
}
for(;;) {
av_read_frame(s, &cur_packet );
if (cur_packet.size == 0)
break;
while (cur_packet.size > 0) {
len = avcodec_decode_video2(c, avf, &got_picture,&cur_packet);
if (len < 0) {
fprintf(stderr, "Error while decoding frame %d\n", frame);
exit(1);
}
if (got_picture) {
printf("saving frame %3d\n", frame);
*/* I just want to get printf message for each frame due to testing
purposes. */*
frame++;
}
cur_packet.size -= len;
cur_packet.data += len;
}
}
fclose(f);
avformat_close_input(&s);
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