I have an app written using ffmpeg-0.6 compiled with libx264
(x264-snapshot-20100308-2245), and I am using the latter to encode video. I
copied the settings from the preset file:
<ffmpeg-dir>/share/ffmpeg/libx264-default.ffpreset
The assertion failure message is:
"
Assertion failed: pic_out->i_pts >= pic_out->i_dts, file encoder/encoder.c, line
2484
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
"
It dies after only a few frames. I print out the frame timestamps right before
encoding, and they are as follows:
[0x244da8] TRACE LibavVideoMuxer: Frame pts=2961, dts=2961
[0x244da8] TRACE LibavVideoMuxer: Frame pts=3330, dts=3330
[0x244da8] TRACE LibavVideoMuxer: Frame pts=6660, dts=6660
[0x244da8] TRACE LibavVideoMuxer: Frame pts=9090, dts=9090
and then it dies (in avcodec_encode_video()). My frame timestamps obviously
don't violate that assertion, so I guess something inside libav* or libx264 is
messing them up. If I disable B frames (comment out the max_b_frames setting),
then it works ok.
The only libx264 logging output I see before the crash is:
[libx264 @ 014878a0]MB rate (108000000) > level limit (983040)
[libx264 @ 014878a0]using cpu capabilities: none!
[libx264 @ 014878a0]profile High, level 5.1
I also added a log line to the x264 source right before the line where it
crashed, to print out the pts and dts in question. It showed:
[libx264 @ 014878a0]pts=-9223372036854775808 dts=0
Looks like garbage.
If I run the 'ffmpeg' tool from the commandline as:
../ffmpeg/bin/ffmpeg -i ../test/s4r3.ts -vcodec libx264 -fpre
../ffmpeg/share/ffmpeg/libx264-default.ffpreset test.flv
that works fine.
The exact codec context setup is pasted below. Anyone have any ideas?
Andy
ctx->coder_type = FF_CODER_TYPE_AC; //coder=1
ctx->flags = CODEC_FLAG_LOOP_FILTER; //flags=+loop
ctx->me_cmp = FF_CMP_CHROMA; //cmp=+chroma
ctx->partitions = X264_PART_I4X4 | X264_PART_I8X8 |
X264_PART_P8X8 | X264_PART_B8X8;
//partitions=+parti8x8+parti4x4+partp8x8+partb8x8
ctx->me_method = ME_HEX; //me_method=hex
ctx->me_subpel_quality = 7; //subq=7
ctx->me_range = 16; //me_range=16
ctx->gop_size = 250; //g=250
ctx->keyint_min = 25; //keyint_min=25
ctx->scenechange_threshold = 40; //sc_threshold=40
ctx->i_quant_factor = 0.71f; //i_qfactor=0.71
ctx->b_frame_strategy = 1; //b_strategy=1
ctx->qcompress = 0.6f; //qcomp=0.6
ctx->qmin = 10; //qmin=10
ctx->qmax = 51; //qmax=51
ctx->max_qdiff = 4; //qdiff=4
ctx->max_b_frames = 3; //bf=3
ctx->refs = 3; //refs=3
ctx->directpred = 1; //directpred=1
ctx->trellis = 1; //trellis=1
ctx->flags2 = CODEC_FLAG2_MIXED_REFS | CODEC_FLAG2_WPRED |
CODEC_FLAG2_8X8DCT | CODEC_FLAG2_FASTPSKIP;
//flags2=+mixed_refs+wpred+dct8x8+fastpskip
ctx->weighted_p_pred = 2; //wpredp=2
(In case it matters, I also set some other standard properties:)
ctx->codec_type = AVMEDIA_TYPE_VIDEO;
ctx->pix_fmt = destPixFmt;
ctx->time_base = timeBase_;
ctx->width = destW;
ctx->height = destH;
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