[FFmpeg-devel] [PATCH 16/33] fftools/ffmpeg_mux_init: improve of_add_programs()

Fri Jul 14 02:30:24 EEST 2023

On Thu, Jul 13, 2023 at 12:55:36PM +0200, Anton Khirnov wrote:
> Replace duplicated(!) and broken* custom string parsing with
> av_dict_parse_string(). Return error codes instead of aborting.
> 
> * e.g. it treats NULL returned from av_get_token() as "separator not
>   found", when in fact av_get_token() only returns NULL on memory
>   allocation failure
> ---
>  fftools/ffmpeg_mux_init.c | 111 ++++++++++++++++++--------------------
>  1 file changed, 52 insertions(+), 59 deletions(-)

smells like memory corruption

-i ~/videos/01c56b0dc1.ts -copy_unknown -map 0 -c copy -fflags +bitexact  -t 3 -y file-copy-unknown.ts

http://samples.mplayerhq.hu/ts/01c56b0dc1.ts

[mpegts @ 0x2ced6980] Could not find codec parameters for stream 6 (Unknown: none ([5][0][0][0] / 0x0005)): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mpegts, from 'videos/01c56b0dc1.ts':
  Duration: 00:00:10.73, start: 40848.136244, bitrate: 8431 kb/s
  Program 1201
  Stream #0:0[0xfb]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn
  Stream #0:1[0x12d](eng): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp
  Stream #0:2[0x132](eng): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp (visual impaired) (descriptions)
  Stream #0:3[0x192](eng): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, 5.1(side), fltp, 384 kb/s
  Stream #0:4[0x3ea]: Unknown: none ([11][0][0][0] / 0x000B)
  Stream #0:5[0x401](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006) (hearing impaired)
  Stream #0:6[0x1f40]: Unknown: none ([5][0][0][0] / 0x0005)
==2131== Conditional jump or move depends on uninitialised value(s)
==2131==    at 0x3162AF: of_open (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==    by 0x31863B: open_files.isra.2 (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==    by 0x319BAA: ffmpeg_parse_options (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==    by 0x2F7A00: main (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==  Uninitialised value was created by a stack allocation
==2131==    at 0x3139DD: of_open (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==
==2131== Invalid free() / delete / delete[] / realloc()
==2131==    at 0x4C32D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2131==    by 0x315AEF: of_open (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==    by 0x31863B: open_files.isra.2 (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==    by 0x319BAA: ffmpeg_parse_options (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==    by 0x2F7A00: main (in ffmpeg-git/ffmpeg/ffmpeg_g)
==2131==  Address 0x22f462840 is not stack'd, malloc'd or (recently) free'd
==2131==
Output #0, mpegts, to 'file-copy-unknown.ts':
  Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 50 tbr, 90k tbn
  Stream #0:1(eng): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp (default)
  Stream #0:2(eng): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp (visual impaired) (descriptions)
  Stream #0:3(eng): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, 5.1(side), fltp, 384 kb/s
  Stream #0:4: Unknown: none ([11][0][0][0] / 0x000B)
  Stream #0:5(eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006) (hearing impaired)
  Stream #0:6: Unknown: none ([5][0][0][0] / 0x0005)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #0:2 -> #0:2 (copy)
  Stream #0:3 -> #0:3 (copy)
  Stream #0:4 -> #0:4 (copy)
  Stream #0:5 -> #0:5 (copy)
  Stream #0:6 -> #0:6 (copy)
Press [q] to stop, [?] for help
[mpegts @ 0x2ced6980] PES packet size mismatche=00:00:02.98 bitrate=   0.0kbits/s speed=5.97x
[mpegts @ 0x2ced6980] Packet corrupt (stream = 1, dts = 3677260813).
[in#0/mpegts @ 0x2ced67c0] corrupt input packet in stream 1
[mpegts @ 0x2ced6980] PES packet size mismatch
[mpegts @ 0x2ced6980] Packet corrupt (stream = 2, dts = 3677250303).
[in#0/mpegts @ 0x2ced67c0] corrupt input packet in stream 2
    Last message repeated 3 times
[mpegts @ 0x2ced6980] PES packet size mismatch
[mpegts @ 0x2ced6980] Packet corrupt (stream = 3, dts = 3677239462).
[in#0/mpegts @ 0x2ced67c0] corrupt input packet in stream 3
    Last message repeated 1 times
[mpegts @ 0x2ea0edc0] Stream 4, codec none, is muxed as a private data stream and may not be recognized upon reading.
[mpegts @ 0x2ea0edc0] Stream 6, codec none, is muxed as a private data stream and may not be recognized upon reading.
[out#0/mpegts @ 0x2d09f040] video:484kB audio:206kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 6.355365%
frame=   42 fps=0.0 q=-1.0 Lsize=     734kB time=00:00:02.98 bitrate=2011.2kbits/s speed=3.31x
==2131==
==2131== HEAP SUMMARY:
==2131==     in use at exit: 49,276 bytes in 240 blocks
==2131==   total heap usage: 23,803 allocs, 23,564 frees, 66,233,951 bytes allocated


[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If you fake or manipulate statistics in a paper in physics you will never
get a job again.
If you fake or manipulate statistics in a paper in medicin you will get
a job for life at the pharma industry.
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