Hello again Carl,
Sorry it took so long to get back to you. I took another stab at bootstrapping ffmpeg, and it seems like the bulk of the test errors revolve around src/libavcodec/ituh263enc.c. Specifically:
$ gdb ./ffmpeg --core=core.1559574121
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Reading symbols from ./ffmpeg...
[New LWP 6314]
[New LWP 6317]
[New LWP 6318]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/ia64-linux-gnu/libthread_db.so.1".
Failed to read a valid object file image from memory.
Core was generated by `/home/jason/ffmpeg-4.1.3/debian/standard/ffmpeg -nostdin -nostats -y -cpuflags'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 init_mv_penalty_and_fcode (s=0x20000008000f3880) at src/libavcodec/ituh263enc.c:776
776 s->me.mv_penalty= mv_penalty; // FIXME exact table for MSMPEG4 & H.263+
[Current thread is 1 (Thread 0x200000000dbc6c20 (LWP 6314))]
(gdb) bt
#0 0x2000000000baeb10 in init_mv_penalty_and_fcode (s=0x20000008000f3880) at src/libavcodec/ituh263enc.c:776
#1 0x2000000000baeb10 in ff_h263_encode_init (s=0x20000008000f3880) at src/libavcodec/ituh263enc.c:774
#2 0x2000000000bdbda0 in ff_mpv_encode_init (avctx=0x20000008000f3450) at src/libavcodec/mpegvideo_enc.c:983
#3 0x2000000001848e90 in avcodec_open2 (avctx=0x20000008000f3450, codec=<optimized out>, options=0x20000008000c8450)
at src/libavcodec/utils.c:930
#4 0x2000000800052940 in init_output_stream (ost=0x20000008000c82f0, error=0x60000fffff88c510 "", error_len=1024)
at src/fftools/ffmpeg.c:3525
#5 0x2000000800056890 in reap_filters (flush=0) at src/fftools/ffmpeg.c:1446
#6 0x2000000800060b20 in transcode_step () at src/fftools/ffmpeg.c:4651
#7 0x2000000800060b20 in transcode () at src/fftools/ffmpeg.c:4695
#8 0x200000080000ff20 in main (argc=60, argv=0x60000fffff88d618) at src/fftools/ffmpeg.c:4914
(gdb) print s->me
$1 = {avctx = 0x0, skip = 0, co_located_mv = {{0, 0}, {0, 0}, {0, 0}, {0, 0}}, direct_basis_mv = {{0, 0}, {0, 0}, {0, 0}, {0, 0}},
scratchpad = 0x0, best_mb = 0x0, temp_mb = {0x0, 0x0}, temp = 0x0, best_bits = 0, map = 0x20000008000a4560,
score_map = 0x20000008000a3e00, map_generation = 0, pre_penalty_factor = 0, penalty_factor = 0, sub_penalty_factor = 0,
mb_penalty_factor = 0, flags = 0, sub_flags = 0, mb_flags = 0, pre_pass = 0, dia_size = 0, xmin = 0, xmax = 0, ymin = 0,
ymax = 0, pred_x = 0, pred_y = 0, src = "" 0x0, 0x0, 0x0}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x0, 0x0,
0x0}}, ref = {{0x0, 0x0, 0x0, 0x0}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x0, 0x0, 0x0}}, stride = 0,
uvstride = 0, mc_mb_var_sum_temp = 0, mb_var_sum_temp = 0, scene_change_score = 0, hpel_put = 0x0, hpel_avg = 0x0,
qpel_put = 0x0, qpel_avg = 0x0, mv_penalty = 0x2000000002232bf9 <default_mv_penalty>, current_mv_penalty = 0x0,
sub_motion_search = 0x0}
(gdb) print mv_penalty
$2 = {'\a' <repeats 4097 times>, '\a' <repeats 4097 times>, '\a' <repeats 4097 times>, '\a' <repeats 4097 times>,
'\a' <repeats 4097 times>, '\a' <repeats 4097 times>, '\a' <repeats 4097 times>, '\a' <repeats 4097 times>}
(gdb) print &mv_penalty
$3 = (uint8_t (*)[8][4097]) 0x200000000206d2e1 <mv_penalty>
(gdb) print s->me.mv_penalty
$4 = (uint8_t (*)[4097]) 0x2000000002232bf9 <default_mv_penalty>
Until we can get you porterbox access, is there any additional debugging information I can provide?
Jason