[x264-devel] debug information

[Stephan Menzel]

Hi there,

I'm doing a bit of progress with my project to encapsulate an x264 encoded live stream into mp4. I took examples from the x264 source and bundled them with the mp4 output. Alas, the created file is nearly empty (707 bytes after close()) and so I'm wondering where I could start looking for the problem.
x264 writes debug output and so I thought it should be possible to read from it whether it actually encoded something successfully. This is what it writes:

x264 [info]: profile Main, level 3.0
set_param_mp4 setting res 640x480 for track 1
mp4 [info]: initial delay 0 (scale 25000)
x264 [debug]: frame=   0 QP=13.21 NAL=3 Slice:I Poc:0   I:1200 P:0    SKIP:0    size=141645 bytes PSNR Y:47.71 U:51.15 V:51.17 SSIM Y:0.99635
x264 [debug]: frame=   1 QP=12.84 NAL=2 Slice:P Poc:2   I:0    P:465  SKIP:735  size=1151 bytes PSNR Y:47.78 U:51.16 V:51.18 SSIM Y:0.99637
x264 [debug]: frame=   2 QP=12.86 NAL=2 Slice:P Poc:4   I:0    P:415  SKIP:785  size=668 bytes PSNR Y:47.78 U:51.17 V:51.18 SSIM Y:0.99637
x264 [debug]: frame=   3 QP=12.86 NAL=2 Slice:P Poc:6   I:0    P:410  SKIP:790  size=639 bytes PSNR Y:47.78 U:51.17 V:51.18 SSIM Y:0.99637

and so on. It always says I:0 after the first frame and only a few bytes coming out of it. The raw images come from a jpeg sequence, hopefully properly converted into YV12 (previous thread ;-)

Anyway, I'm just trying to find out whether I'm misusing gpac or x264 so if one can see anything helpful out of that debug out please let me know. I haven't got a clue what those values mean.

My impression is, that set_eop_mp4() doesn't get enough data. Isn't gf_isom_add_sample() the function that's actually writing the encoded data into the file? And yet, straceing it, I see no file IO in that function even though p_sample->dataLength is larger than  zero (283294).

Cheers,

Stephan