Snippets for ffmpeg 8.1.2 from FreeBSD 150arm64

Sourced from https://pkg-status.freebsd.org/ampere5/data/latest-per-pkg/ffmpeg-nox11/8.1.2_1,1/150arm64-default.log.

libavformat/mov.c:1253:12: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
 1253 |     return ret;
      |            ^~~

libavcodec/adpcmenc.c:1009:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1009 | ADPCM_ENCODER(ADPCM_ARGO,    adpcm_argo,    sample_fmts_p, 0,                             "ADPCM Argonaut Games",                   MONO_STEREO)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1010:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1010 | ADPCM_ENCODER(ADPCM_IMA_AMV, adpcm_ima_amv, sample_fmts,   0,                             "ADPCM IMA AMV",                          CODEC_CH_LAYOUTS(AV_CHANNEL_LAYOUT_MONO), CODEC_SAMPLERATES(22050), AVCLASS)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1010:175: warning: 'supported_samplerates' is deprecated [-Wdeprecated-declarations]
 1010 | ADPCM_ENCODER(ADPCM_IMA_AMV, adpcm_ima_amv, sample_fmts,   0,                             "ADPCM IMA AMV",                          CODEC_CH_LAYOUTS(AV_CHANNEL_LAYOUT_MONO), CODEC_SAMPLERATES(22050), AVCLASS)
      |                                                                                                                                                                               ^

libavcodec/adpcmenc.c:1011:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1011 | ADPCM_ENCODER(ADPCM_IMA_APM, adpcm_ima_apm, sample_fmts,   AV_CODEC_CAP_SMALL_LAST_FRAME, "ADPCM IMA Ubisoft APM",                  MONO_STEREO, AVCLASS)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1012:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1012 | ADPCM_ENCODER(ADPCM_IMA_ALP, adpcm_ima_alp, sample_fmts,   AV_CODEC_CAP_SMALL_LAST_FRAME, "ADPCM IMA High Voltage Software ALP",    MONO_STEREO, AVCLASS)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1013:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1013 | ADPCM_ENCODER(ADPCM_IMA_QT,  adpcm_ima_qt,  sample_fmts_p, 0,                             "ADPCM IMA QuickTime",                    MONO_STEREO)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1014:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1014 | ADPCM_ENCODER(ADPCM_IMA_SSI, adpcm_ima_ssi, sample_fmts,   AV_CODEC_CAP_SMALL_LAST_FRAME, "ADPCM IMA Simon & Schuster Interactive", MONO_STEREO, AVCLASS)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1015:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1015 | ADPCM_ENCODER(ADPCM_IMA_WAV, adpcm_ima_wav, sample_fmts_p, 0,                             "ADPCM IMA WAV",                          MONO_STEREO, AVCLASS)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1016:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1016 | ADPCM_ENCODER(ADPCM_IMA_WS,  adpcm_ima_ws,  sample_fmts,   AV_CODEC_CAP_SMALL_LAST_FRAME, "ADPCM IMA Westwood",                     MONO_STEREO, AVCLASS)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1017:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1017 | ADPCM_ENCODER(ADPCM_MS,      adpcm_ms,      sample_fmts,   0,                             "ADPCM Microsoft",                        MONO_STEREO, AVCLASS)
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1018:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1018 | ADPCM_ENCODER(ADPCM_SWF,     adpcm_swf,     sample_fmts,   0,                             "ADPCM Shockwave Flash",                  MONO_STEREO, CODEC_SAMPLERATES(11025, 22050, 44100))
      |                                                                                                                                     ^

libavcodec/adpcmenc.c:1018:146: warning: 'supported_samplerates' is deprecated [-Wdeprecated-declarations]
 1018 | ADPCM_ENCODER(ADPCM_SWF,     adpcm_swf,     sample_fmts,   0,                             "ADPCM Shockwave Flash",                  MONO_STEREO, CODEC_SAMPLERATES(11025, 22050, 44100))
      |                                                                                                                                                  ^

libavcodec/adpcmenc.c:1019:133: warning: 'ch_layouts' is deprecated [-Wdeprecated-declarations]
 1019 | ADPCM_ENCODER(ADPCM_YAMAHA,  adpcm_yamaha,  sample_fmts,   0,                             "ADPCM Yamaha",                           MONO_STEREO, AVCLASS)
      |                                                                                                                                     ^

libavcodec/bsf/extract_extradata.c:374:52: warning: passing 'const uint8_t *' (aka 'const unsigned char *') to parameter of type 'uint8_t *' (aka 'unsigned char *') discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
  374 |             bytestream2_init_writer(&pb_extradata, nal->data, 0);
      |                                                    ^~~~~~~~~