1975 audio_only m4a 1623340890 7b2c0fd227c17ac5b3915cf34c55bddd 03a3348ad6d0aea212ee02b25662b0fbb6a4d9f449777f96c0ee466b23b411ef audio only 2021 06 10 12 01 30 0 104 227 160 148 08 11 21 41 51 mp4 iso iec 14496 3 aac mono dataformat codec sample_rate channels bits_per_sample channelmode bitrate compression_ratio quicktime frame_rate undetermined language audio standard ftyp mp42 isom hierarchy name size signature fourcc free offset moov mvhd creation_time modify_time time_scale duration preferred_rate preferred_volume matrix_a matrix_d matrix_w next_track_id creation_time_unix modify_time_unix trak tkhd flags_raw trackid volume mdia mdhd language_id playtime_seconds hdlr soun ac component_subtype component_name minf smhd dinf dref url type number_entries data_references subatoms stbl stsd mp4a data_format reference_index audio_channels audio_bit_depth audio_sample_rate temporal_quality width resolution_x data_size frame_count pixel_depth color_table_id sample_description_table stts sample_count sample_duration time_to_sample_table stsc stsz co64 mdat dat bit_depth controller display_scale video stts_framecount 35 01 analyze timings