libx264 codec support when using add_stream after pyav 11?

[apiszcz]

Why was libx264 codec support dropped in pyav version 14?
Attempting to use 'h264' with stream.pix_fmt = 'gray' fails with unsupported attribute.

The following codec works on UBUNTU 24.04.01, Python 3.12, FFMPEG 6.1.1 using pyav version 11
stream = container.add_stream('libx264', rate=fps)

The following codec DOES NOT WORK UBUNTU 24.04.01, Python 3.12, FFMPEG 6.1.1 using pyav version 14
stream = container.add_stream('libx264', rate=fps)

Tested mpeg4 with pyav 14 which is not the same as libx264 it does not support pix_fmt = 'gray'.

PYAV = 11
['012v', '4xm', '8bps', '8svx_exp', '8svx_fib', 'a64multi', 'a64multi5', 'aac', 'aac_fixed', 'aac_latm', 'aasc', 'ac3', 'ac3_fixed', 'acelp.kelvin', 'adpcm_4xm', 'adpcm_adx', 'adpcm_afc', 'adpcm_agm', 'adpcm_aica', 'adpcm_argo', 'adpcm_ct', 'adpcm_dtk', 'adpcm_ea', 'adpcm_ea_maxis_xa', 'adpcm_ea_r1', 'adpcm_ea_r2', 'adpcm_ea_r3', 'adpcm_ea_xas', 'adpcm_ima_acorn', 'adpcm_ima_alp', 'adpcm_ima_amv', 'adpcm_ima_apc', 'adpcm_ima_apm', 'adpcm_ima_cunning', 'adpcm_ima_dat4', 'adpcm_ima_dk3', 'adpcm_ima_dk4', 'adpcm_ima_ea_eacs', 'adpcm_ima_ea_sead', 'adpcm_ima_iss', 'adpcm_ima_moflex', 'adpcm_ima_mtf', 'adpcm_ima_oki', 'adpcm_ima_qt', 'adpcm_ima_rad', 'adpcm_ima_smjpeg', 'adpcm_ima_ssi', 'adpcm_ima_wav', 'adpcm_ima_ws', 'adpcm_ms', 'adpcm_mtaf', 'adpcm_psx', 'adpcm_sbpro_2', 'adpcm_sbpro_3', 'adpcm_sbpro_4', 'adpcm_swf', 'adpcm_thp', 'adpcm_thp_le', 'adpcm_vima', 'adpcm_xa', 'adpcm_yamaha', 'adpcm_zork', 'agm', 'aic', 'alac', 'alias_pix', 'als', 'amrnb', 'amrwb', 'amv', 'anm', 'ansi', 'ape', 'apng', 'aptx', 'aptx_hd', 'arbc', 'argo', 'ass', 'asv1', 'asv2', 'atrac1', 'atrac3', 'atrac3al', 'atrac3plus', 'atrac3plusal', 'atrac9', 'aura', 'aura2', 'av1', 'avrn', 'avrp', 'avs', 'avui', 'ayuv', 'bethsoftvid', 'bfi', 'binkaudio_dct', 'binkaudio_rdft', 'binkvideo', 'bintext', 'bitpacked', 'bmp', 'bmv_audio', 'bmv_video', 'brender_pix', 'c93', 'camstudio', 'camtasia', 'cavs', 'cc_dec', 'cdgraphics', 'cdtoons', 'cdxl', 'cfhd', 'cinepak', 'clearvideo', 'cljr', 'cllc', 'comfortnoise', 'cook', 'cpia', 'cri', 'cyuv', 'dca', 'dds', 'derf_dpcm', 'dfa', 'dfpwm', 'dirac', 'dnxhd', 'dolby_e', 'dpx', 'dsd_lsbf', 'dsd_lsbf_planar', 'dsd_msbf', 'dsd_msbf_planar', 'dsicinaudio', 'dsicinvideo', 'dss_sp', 'dst', 'dvaudio', 'dvbsub', 'dvdsub', 'dvvideo', 'dxa', 'dxtory', 'dxv', 'eac3', 'eacmv', 'eamad', 'eatgq', 'eatgv', 'eatqi', 'escape124', 'escape130', 'evrc', 'exr', 'fastaudio', 'ffv1', 'ffvhuff', 'fic', 'fits', 'flac', 'flashsv', 'flashsv2', 'flic', 'flv', 'fmvc', 'fraps', 'frwu', 'g2m', 'g722', 'g723_1', 'g726', 'g726le', 'g729', 'gdv', 'gem', 'gif', 'gremlin_dpcm', 'gsm', 'gsm_ms', 'h261', 'h263', 'h263i', 'h263p', 'h264', 'hap', 'hca', 'hcom', 'hevc', 'hnm4video', 'hq_hqa', 'hqx', 'huffyuv', 'hymt', 'iac', 'idcinvideo', 'idf', 'iff', 'ilbc', 'imc', 'imm4', 'imm5', 'indeo2', 'indeo3', 'indeo4', 'indeo5', 'interplay_dpcm', 'interplayacm', 'interplayvideo', 'ipu', 'jacosub', 'jpeg2000', 'jpegls', 'jv', 'kgv1', 'kmvc', 'lagarith', 'libaom-av1', 'libdav1d', 'libmp3lame', 'libopencore_amrnb', 'libopencore_amrwb', 'libopenjpeg', 'libopus', 'libspeex', 'libtheora', 'libtwolame', 'libvorbis', 'libvpx', 'libvpx-vp9', 'libx264', 'libx264rgb', 'libx265', 'libxvid', 'ljpeg', 'loco', 'lscr', 'm101', 'mace3', 'mace6', 'magicyuv', 'mdec', 'metasound', 'microdvd', 'mimic', 'mjpeg', 'mjpegb', 'mlp', 'mmvideo', 'mobiclip', 'motionpixels', 'mov_text', 'mp1', 'mp1float', 'mp2', 'mp2fixed', 'mp2float', 'mp3', 'mp3adu', 'mp3adufloat', 'mp3float', 'mp3on4', 'mp3on4float', 'mpc7', 'mpc8', 'mpeg1video', 'mpeg2video', 'mpeg4', 'mpegvideo', 'mpl2', 'msa1', 'mscc', 'msmpeg4', 'msmpeg4v1', 'msmpeg4v2', 'msnsiren', 'msp2', 'msrle', 'mss1', 'mss2', 'msvideo1', 'mszh', 'mts2', 'mv30', 'mvc1', 'mvc2', 'mvdv', 'mvha', 'mwsc', 'mxpeg', 'nellymoser', 'notchlc', 'nuv', 'on2avc', 'opus', 'paf_audio', 'paf_video', 'pam', 'pbm', 'pcm_alaw', 'pcm_bluray', 'pcm_dvd', 'pcm_f16le', 'pcm_f24le', 'pcm_f32be', 'pcm_f32le', 'pcm_f64be', 'pcm_f64le', 'pcm_lxf', 'pcm_mulaw', 'pcm_s16be', 'pcm_s16be_planar', 'pcm_s16le', 'pcm_s16le_planar', 'pcm_s24be', 'pcm_s24daud', 'pcm_s24le', 'pcm_s24le_planar', 'pcm_s32be', 'pcm_s32le', 'pcm_s32le_planar', 'pcm_s64be', 'pcm_s64le', 'pcm_s8', 'pcm_s8_planar', 'pcm_sga', 'pcm_u16be', 'pcm_u16le', 'pcm_u24be', 'pcm_u24le', 'pcm_u32be', 'pcm_u32le', 'pcm_u8', 'pcm_vidc', 'pcx', 'pfm', 'pgm', 'pgmyuv', 'pgssub', 'pgx', 'phm', 'photocd', 'pictor', 'pixlet', 'pjs', 'png', 'ppm', 'prores', 'prores_aw', 'prores_ks', 'prosumer', 'psd', 'ptx', 'qcelp', 'qdm2', 'qdmc', 'qdraw', 'qoi', 'qpeg', 'qtrle', 'r10k', 'r210', 'ralf', 'rasc', 'rawvideo', 'real_144', 'real_288', 'realtext', 'rl2', 'roq_dpcm', 'roqvideo', 'rpza', 'rscc', 'rv10', 'rv20', 'rv30', 'rv40', 's302m', 'sami', 'sanm', 'sbc', 'scpr', 'screenpresso', 'sdx2_dpcm', 'sga', 'sgi', 'sgirle', 'sheervideo', 'shorten', 'simbiosis_imx', 'sipr', 'siren', 'smackaud', 'smackvid', 'smc', 'smvjpeg', 'snow', 'sol_dpcm', 'sonic', 'sonicls', 'sp5x', 'speedhq', 'speex', 'srgc', 'srt', 'ssa', 'stl', 'subrip', 'subviewer', 'subviewer1', 'sunrast', 'svq1', 'svq3', 'tak', 'targa', 'targa_y216', 'tdsc', 'text', 'theora', 'thp', 'tiertexseqvideo', 'tiff', 'tmv', 'truehd', 'truemotion1', 'truemotion2', 'truemotion2rt', 'truespeech', 'tscc2', 'tta', 'ttml', 'twinvq', 'txd', 'ultimotion', 'utvideo', 'v210', 'v210x', 'v308', 'v408', 'v410', 'vb', 'vble', 'vbn', 'vc1', 'vc1image', 'vc2', 'vcr1', 'vmdaudio', 'vmdvideo', 'vmnc', 'vorbis', 'vp3', 'vp4', 'vp5', 'vp6', 'vp6a', 'vp6f', 'vp7', 'vp8', 'vp9', 'vplayer', 'vqavideo', 'wavesynth', 'wavpack', 'wcmv', 'webp', 'webvtt', 'wmalossless', 'wmapro', 'wmav1', 'wmav2', 'wmavoice', 'wmv1', 'wmv2', 'wmv3', 'wmv3image', 'wnv1', 'wrapped_avframe', 'ws_snd1', 'xan_dpcm', 'xan_wc3', 'xan_wc4', 'xbin', 'xbm', 'xface', 'xl', 'xma1', 'xma2', 'xpm', 'xsub', 'xwd', 'y41p', 'ylc', 'yop', 'yuv4', 'zerocodec', 'zlib', 'zmbv']

PYAV = 14
av.codecs_available

['012v', '4xm', '8bps', '8svx_exp', '8svx_fib', 'a64multi', 'a64multi5', 'aac', 'aac_fixed', 'aac_latm', 'aasc', 'ac3', 'ac3_fixed', 'acelp.kelvin', 'adpcm_4xm', 'adpcm_adx', 'adpcm_afc', 'adpcm_agm', 'adpcm_aica', 'adpcm_argo', 'adpcm_ct', 'adpcm_dtk', 'adpcm_ea', 'adpcm_ea_maxis_xa', 'adpcm_ea_r1', 'adpcm_ea_r2', 'adpcm_ea_r3', 'adpcm_ea_xas', 'adpcm_ima_acorn', 'adpcm_ima_alp', 'adpcm_ima_amv', 'adpcm_ima_apc', 'adpcm_ima_apm', 'adpcm_ima_cunning', 'adpcm_ima_dat4', 'adpcm_ima_dk3', 'adpcm_ima_dk4', 'adpcm_ima_ea_eacs', 'adpcm_ima_ea_sead', 'adpcm_ima_iss', 'adpcm_ima_moflex', 'adpcm_ima_mtf', 'adpcm_ima_oki', 'adpcm_ima_qt', 'adpcm_ima_rad', 'adpcm_ima_smjpeg', 'adpcm_ima_ssi', 'adpcm_ima_wav', 'adpcm_ima_ws', 'adpcm_ms', 'adpcm_mtaf', 'adpcm_psx', 'adpcm_sbpro_2', 'adpcm_sbpro_3', 'adpcm_sbpro_4', 'adpcm_swf', 'adpcm_thp', 'adpcm_thp_le', 'adpcm_vima', 'adpcm_xa', 'adpcm_xmd', 'adpcm_yamaha', 'adpcm_zork', 'agm', 'aic', 'alac', 'alias_pix', 'als', 'amrnb', 'amrwb', 'amv', 'anm', 'ansi', 'anull', 'apac', 'ape', 'apng', 'aptx', 'aptx_hd', 'arbc', 'argo', 'ass', 'asv1', 'asv2', 'atrac1', 'atrac3', 'atrac3al', 'atrac3plus', 'atrac3plusal', 'atrac9', 'aura', 'aura2', 'av1', 'avrn', 'avrp', 'avs', 'avui', 'bethsoftvid', 'bfi', 'binkaudio_dct', 'binkaudio_rdft', 'binkvideo', 'bintext', 'bitpacked', 'bmp', 'bmv_audio', 'bmv_video', 'bonk', 'brender_pix', 'c93', 'camstudio', 'camtasia', 'cavs', 'cbd2_dpcm', 'cc_dec', 'cdgraphics', 'cdtoons', 'cdxl', 'cfhd', 'cinepak', 'clearvideo', 'cljr', 'cllc', 'comfortnoise', 'cook', 'cpia', 'cri', 'cyuv', 'dca', 'dds', 'derf_dpcm', 'dfa', 'dfpwm', 'dirac', 'dnxhd', 'dolby_e', 'dpx', 'dsd_lsbf', 'dsd_lsbf_planar', 'dsd_msbf', 'dsd_msbf_planar', 'dsicinaudio', 'dsicinvideo', 'dss_sp', 'dst', 'dvaudio', 'dvbsub', 'dvdsub', 'dvvideo', 'dxa', 'dxtory', 'dxv', 'eac3', 'eacmv', 'eamad', 'eatgq', 'eatgv', 'eatqi', 'escape124', 'escape130', 'evrc', 'exr', 'fastaudio', 'ffv1', 'ffvhuff', 'fic', 'fits', 'flac', 'flashsv', 'flashsv2', 'flic', 'flv', 'fmvc', 'fraps', 'frwu', 'ftr', 'g2m', 'g722', 'g723_1', 'g726', 'g726le', 'g729', 'gdv', 'gem', 'gif', 'gremlin_dpcm', 'gsm', 'gsm_ms', 'h261', 'h263', 'h263i', 'h263p', 'h264', 'hap', 'hca', 'hcom', 'hdr', 'hevc', 'hnm4video', 'hq_hqa', 'hqx', 'huffyuv', 'hymt', 'iac', 'idcinvideo', 'idf', 'iff', 'ilbc', 'imc', 'imm4', 'imm5', 'indeo2', 'indeo3', 'indeo4', 'indeo5', 'interplay_dpcm', 'interplayacm', 'interplayvideo', 'ipu', 'jacosub', 'jpeg2000', 'jpegls', 'jv', 'kgv1', 'kmvc', 'lagarith', 'lead', 'libaom-av1', 'libdav1d', 'libmp3lame', 'libopencore_amrnb', 'libopencore_amrwb', 'libopenh264', 'libopus', 'libspeex', 'libtwolame', 'libvorbis', 'libvpx', 'libvpx-vp9', 'libwebp', 'libwebp_anim', 'ljpeg', 'loco', 'lscr', 'm101', 'mace3', 'mace6', 'magicyuv', 'mdec', 'media100', 'metasound', 'microdvd', 'mimic', 'misc4', 'mjpeg', 'mjpegb', 'mlp', 'mmvideo', 'mobiclip', 'motionpixels', 'mov_text', 'mp1', 'mp1float', 'mp2', 'mp2fixed', 'mp2float', 'mp3', 'mp3adu', 'mp3adufloat', 'mp3float', 'mp3on4', 'mp3on4float', 'mpc7', 'mpc8', 'mpeg1video', 'mpeg2video', 'mpeg4', 'mpegvideo', 'mpl2', 'msa1', 'mscc', 'msmpeg4', 'msmpeg4v1', 'msmpeg4v2', 'msnsiren', 'msp2', 'msrle', 'mss1', 'mss2', 'msvideo1', 'mszh', 'mts2', 'mv30', 'mvc1', 'mvc2', 'mvdv', 'mvha', 'mwsc', 'mxpeg', 'nellymoser', 'notchlc', 'nuv', 'on2avc', 'opus', 'osq', 'paf_audio', 'paf_video', 'pam', 'pbm', 'pcm_alaw', 'pcm_bluray', 'pcm_dvd', 'pcm_f16le', 'pcm_f24le', 'pcm_f32be', 'pcm_f32le', 'pcm_f64be', 'pcm_f64le', 'pcm_lxf', 'pcm_mulaw', 'pcm_s16be', 'pcm_s16be_planar', 'pcm_s16le', 'pcm_s16le_planar', 'pcm_s24be', 'pcm_s24daud', 'pcm_s24le', 'pcm_s24le_planar', 'pcm_s32be', 'pcm_s32le', 'pcm_s32le_planar', 'pcm_s64be', 'pcm_s64le', 'pcm_s8', 'pcm_s8_planar', 'pcm_sga', 'pcm_u16be', 'pcm_u16le', 'pcm_u24be', 'pcm_u24le', 'pcm_u32be', 'pcm_u32le', 'pcm_u8', 'pcm_vidc', 'pcx', 'pdv', 'pfm', 'pgm', 'pgmyuv', 'pgssub', 'pgx', 'phm', 'photocd', 'pictor', 'pixlet', 'pjs', 'png', 'ppm', 'prores', 'prores_aw', 'prores_ks', 'prosumer', 'psd', 'ptx', 'qcelp', 'qdm2', 'qdmc', 'qdraw', 'qoa', 'qoi', 'qpeg', 'qtrle', 'r10k', 'r210', 'ralf', 'rasc', 'rawvideo', 'real_144', 'real_288', 'realtext', 'rka', 'rl2', 'roq_dpcm', 'roqvideo', 'rpza', 'rscc', 'rtv1', 'rv10', 'rv20', 'rv30', 'rv40', 's302m', 'sami', 'sanm', 'sbc', 'scpr', 'screenpresso', 'sdx2_dpcm', 'sga', 'sgi', 'sgirle', 'sheervideo', 'shorten', 'simbiosis_imx', 'sipr', 'siren', 'smackaud', 'smackvid', 'smc', 'smvjpeg', 'snow', 'sol_dpcm', 'sonic', 'sonicls', 'sp5x', 'speedhq', 'speex', 'srgc', 'srt', 'ssa', 'stl', 'subrip', 'subviewer', 'subviewer1', 'sunrast', 'svq1', 'svq3', 'tak', 'targa', 'targa_y216', 'tdsc', 'text', 'theora', 'thp', 'tiertexseqvideo', 'tiff', 'tmv', 'truehd', 'truemotion1', 'truemotion2', 'truemotion2rt', 'truespeech', 'tscc2', 'tta', 'ttml', 'twinvq', 'txd', 'ultimotion', 'utvideo', 'v210', 'v210x', 'v308', 'v408', 'v410', 'vb', 'vble', 'vbn', 'vc1', 'vc1image', 'vc2', 'vcr1', 'vmdaudio', 'vmdvideo', 'vmix', 'vmnc', 'vnull', 'vorbis', 'vp3', 'vp4', 'vp5', 'vp6', 'vp6a', 'vp6f', 'vp7', 'vp8', 'vp9', 'vplayer', 'vqavideo', 'vqc', 'vvc', 'wady_dpcm', 'wavarc', 'wavesynth', 'wavpack', 'wbmp', 'wcmv', 'webp', 'webvtt', 'wmalossless', 'wmapro', 'wmav1', 'wmav2', 'wmavoice', 'wmv1', 'wmv2', 'wmv3', 'wmv3image', 'wnv1', 'wrapped_avframe', 'ws_snd1', 'xan_dpcm', 'xan_wc3', 'xan_wc4', 'xbin', 'xbm', 'xface', 'xl', 'xma1', 'xma2', 'xpm', 'xsub', 'xwd', 'y41p', 'ylc', 'yop', 'yuv4', 'zerocodec', 'zlib', 'zmbv']