Re: [FFmpeg-devel] 971108 - ffmpeg doesn't use GPU

[Timo Rothenpieler]

This list is about development of ffmpeg itself.
You are probably looking for libav-users.



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[FFmpeg-devel] 971108 - ffmpeg doesn't use GPU

[hamidi]

I got the latest version binaries of ffmpeg from here
. When I examine CPU and GPU usages
when I play a video by its ffplay, I see that GPU is used during play. Not
much using of CPU also indicates it. But when I get the latest version
sources from the original site, I can't use GPU. To clarify, I include a
player test program I wrote until now. When I uncomment the line which
includes avcodec_find_decoder_by_name("h264_cuvid"), I get error -1. The
error happens in avcodec_open2 with the description of Operation not
permitted.

CString format(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
char buf[512];
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
return buf;
}

int CplayerDlg::play()
{
FILE *fp = fopen("video_files/1010.brf", "rb");
if (!fp)
{
AfxMessageBox("can't open video file");
return -1;
}
RecordFrame frame;
RecordHeader hdr;
fread(&frame, sizeof(frame), 1, fp);
if (frame.frameType != FRAME_TYPE_HEADER)
{
AfxMessageBox("record file doesn't begin with header");
return -1;
}
fread(&hdr, sizeof(hdr), 1, fp);
GetDlgItem(IDC_DIM)->SetWindowText(format("%dx%d", hdr.width,
hdr.height));
GetDlgItem(IDC_CODEC_ID)->SetWindowText(format("%d", hdr.codecId));
GetDlgItem(IDC_PIXEL_FORMAT)->SetWindowText(format("%d",
hdr.pixelFormat));
GetDlgItem(IDC_TIMEBASE)->SetWindowText(format("%d/%d",
hdr.timebaseNum, hdr.timebaseDen));
AVCodec *pCodec;

#if 0
#define CHECK(decoder)\
pCodec = avcodec_find_decoder_by_name(#decoder);\
AfxMessageBox(pCodec ? #decoder " found" : "can't find " #decoder);

CHECK(h264_cuvid);

#undef CHECK
#endif

pCodec = avcodec_find_decoder(AV_CODEC_ID_H264);
//pCodec = avcodec_find_decoder_by_name("h264_cuvid");
if (!pCodec)
{
AfxMessageBox("can't find h264 decoder");
return -1;
}

AVCodecContext *pCodecContext = avcodec_alloc_context3(pCodec);
if (!pCodecContext)
{
AfxMessageBox("can't allocate codec context");
return -1;
}

#if 0
// enumerating available codecs
//av_register_all();
avcodec_register_all();

AVCodec *current_codec = av_codec_next(NULL);
while (current_codec != NULL)
{
TRACE("%s\n", current_codec->name);
current_codec = av_codec_next(current_codec);
}
#endif

int err = avcodec_open2(pCodecContext, pCodec, NULL);
if (err != 0)
{
char buf[AV_ERROR_MAX_STRING_SIZE];
av_make_error_string(buf, AV_ERROR_MAX_STRING_SIZE, err);
char buf2[AV_ERROR_MAX_STRING_SIZE];
sprintf(buf2, "%d (%x): %s\n", err, err, buf);
AfxMessageBox(buf2);
return -1;
}
AfxMessageBox("operation completed successfully");
fclose(fp);
return 0;
}
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