libvpx core dump when testing vp9 codec with vpxenc

[wkw...@gmail.com]

The latest experimental branch of libvpx core dumps when trying to encode with the vp9 codec.  I have a test script I use to compare a simple encoding of vp8 and vp9 from a known source.  Anyway, recently

it appears, there's a regression where I now get a seg fault with the vp9 codec.

System: Ubuntu 13.04 x86_x64

built with "--enable-vp8 --enable-vp9 --enable-postprocs --disable-shared"

VP8 Codec Works.. 

+ ffmpeg -i big_buck_bunny_1080p_h264.mov -t 30 -f yuv4mpegpipe -

+ vpxenc -v --codec=vp8 --target-bitrate=1000 -o big_buck_bunny_vp8.webm -

Codec: WebM Project VP8 Encoder v1.2.0-3085-g9536db2

Source file: - Format: YV12

Destination file: big_buck_bunny_vp8.webm

Encoder parameters:

    g_usage                      = 0

    g_threads                    = 0

    g_profile                    = 0

    g_w                          = 1920

    g_h                          = 1080

    g_timebase.num               = 1

    g_timebase.den               = 1000

    g_error_resilient            = 0

    g_pass                       = 0

    g_lag_in_frames              = 0

    rc_dropframe_thresh          = 0

    rc_resize_allowed            = 0

    rc_resize_up_thresh          = 60

    rc_resize_down_thresh        = 30

    rc_end_usage                 = 0

    rc_target_bitrate            = 1000

    rc_min_quantizer             = 4

    rc_max_quantizer             = 63

    rc_undershoot_pct            = 100

    rc_overshoot_pct             = 100

    rc_buf_sz                    = 6000

    rc_buf_initial_sz            = 4000

    rc_buf_optimal_sz            = 5000

    rc_2pass_vbr_bias_pct        = 50

    rc_2pass_vbr_minsection_pct  = 0

    rc_2pass_vbr_maxsection_pct  = 400

    kf_mode                      = 1

    kf_min_dist                  = 0

    kf_max_dist                  = 120

Pass 1/1 frame    1/0          0B       0 us inf ms/f [ETA  unknown] [K   3528F

Pass 1/1 frame    2/1       3528B  311236 us 6.43 fps [ETA  unknown] [K    196F

Pass 1/1 frame  720/720  3956196B  395723 ms 1.82 fps [ETA  unknown] [K

Pass 1/1 frame  720/720  3956196B   43957b/f 1054985b/s  395695 ms (1.82 fps) [K

VP9 Codec crashes

+ ffmpeg -i big_buck_bunny_1080p_h264.mov -t 30 -f yuv4mpegpipe -

+ vpxenc -v --codec=vp9 --target-bitrate=1000 -o big_buck_bunny_vp9.webm -

Codec: WebM Project VP9 Encoder v1.2.0-3085-g9536db2

Source file: - Format: YV12

Destination file: big_buck_bunny_vp9.webm

Encoder parameters:

    g_usage                      = 0

    g_threads                    = 0

    g_profile                    = 0

    g_w                          = 1920

    g_h                          = 1080

    g_timebase.num               = 1

    g_timebase.den               = 1000

    g_error_resilient            = 0

    g_pass                       = 0

    g_lag_in_frames              = 0

    rc_dropframe_thresh          = 0

    rc_resize_allowed            = 0

    rc_resize_up_thresh          = 60

    rc_resize_down_thresh        = 30

    rc_end_usage                 = 0

    rc_target_bitrate            = 1000

    rc_min_quantizer             = 4

    rc_max_quantizer             = 63

    rc_undershoot_pct            = 100

    rc_overshoot_pct             = 100

    rc_buf_sz                    = 6000

    rc_buf_initial_sz            = 4000

    rc_buf_optimal_sz            = 5000

    rc_2pass_vbr_bias_pct        = 50

    rc_2pass_vbr_minsection_pct  = 0

    rc_2pass_vbr_maxsection_pct  = 400

    kf_mode                      = 1

    kf_min_dist                  = 0

    kf_max_dist                  = 120

Pass 1/1 frame    1/0          0B       0 us inf ms/f [ETA  unknown] [K    179F

Pass 1/1 frame    2/1        179B   45952 ms 22976.33 ms/f [ETA  unknown] [K./basic_vpxenc.sh: line 10: 22116 Broken pipe             ffmpeg -i big_buck_bunny_1080p_h264.mov -t 30 -f yuv4mpegpipe - 2> /dev/null

     22117 Segmentation fault      (core dumped) | vpxenc -v --codec=vp9 --target-bitrate=1000 -o big_buck_bunny_vp9.webm -

+ set +x

[Ronald Bultje]

Hi,

you seem to be trying to do a 1-pass encode. VP9 currently only supports 2-pass encoding. To do 2-pass encoding using FFmpeg and piped input, do:

ffmpeg -i $file [ff options] -f yuv4mpegpipe - | vpxenc [vpx options] --passes=2 --pass=1 --codec=vp9 --fpf=file.fpf

ffmpeg -i $file [ff options] -f yuv4mpegpipe - | vpxenc [vpx options] --passes=2 --pass=2 --codec=vp9 --fpf=file.fpf

Then it should work. Note that using default options won't necessarily give you the best encoding results, the defaults aren't very well tuned yet. See earlier messages on this mailinglist for best VP9 encoding options, or ask on IRC.

HTH,

Ronald

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