mp4_parser_parse_atoms: atom size 20942994 overflows the input stream size 4080

[kousthub97]

Hi,

I was unable to play few mp4 assets with h264 video and aac audio codec files with below error.

[debug] 1164097#1164097: *60 mp4_parser_parse_atoms: atom name=mdat, size=1 2026/02/12 15:59:09
[debug] 1164097#1164097: *60 mp4_parser_parse_atoms: atom size 20942994 overflows the input stream size 4080 2026/02/12 15:59:09
[error] 1164097#1164097: *60 mp4_metadata_reader_read: exhausted all moov read attempts while sending to client, client: 127.0.0.1, server: 127.0.0.1, request: "GET /dash_g001/nmdc/20260127/others/835037.json/manifest.mpd HTTP/1.1", host: "127.0.0.1", referrer: "https://testgk.com/" 2026/02/12 15:59:09
[debug] 1164097#1164097: *60 ngx_http_vod_read_metadata: read_metadata(mp4) failed -1000 2026/02/12 15:59:09

mp4dump for the file:
[ { "name": "ftyp", "header_size": 8, "size": 24, "major_brand": "mp42", "minor_version": 0, "compatible_brand": "mp42", "compatible_brand": "mp41" }, { "name": "free", "header_size": 8, "size": 86628 }, { "name": "BE7ACFCB97A9-42E8-9C71-9994-91E3AFAC", "header_size": 24, "size": 7296 }, { "name": "mdat", "header_size": 16, "size": 181709177 }, { "name": "mdat", "header_size": 16, "size": 34697943 }, { "name": "mdat", "header_size": 16, "size": 20943010 }, { "name": "mdat", "header_size": 16, "size": 16 }, { "name": "moov", "header_size": 8, "size": 188977, "children":[ { "name": "mvhd", "header_size": 12, "size": 108, "timescale": 90000, "duration": 12971250, "duration(ms)": 144125 }, { "name": "trak", "header_size": 8, "size": 46855, "children":[ { "name": "tkhd", "header_size": 12, "size": 92, "flags": 3, "enabled": 1, "id": 1, "duration": 12971250, "width": 1920.000000, "height": 1080.000000 }, { "name": "edts", "header_size": 8, "size": 36, "children":[ { "name": "elst", "header_size": 12, "size": 28, "entry_count": 1, "entry/segment duration": 12971250, "entry/media time": 1000, "entry/media rate": 1 }] }, { "name": "mdia", "header_size": 8, "size": 46719, "children":[ { "name": "mdhd", "header_size": 12, "size": 32, "timescale": 24000, "duration": 3459000, "duration(ms)": 144125, "language": "eng" }, { "name": "hdlr", "header_size": 12, "size": 64, "handler_type": "vide", "handler_name": "Mainconcept Video Media Handler" }, { "name": "minf", "header_size": 8, "size": 46615, "children":[ { "name": "vmhd", "header_size": 12, "size": 20, "flags": 1, "graphics_mode": 0, "op_color": "0000,0000,0000" }, { "name": "hdlr", "header_size": 12, "size": 51, "handler_type": "alis", "handler_name": "Alias Data Handler" }, { "name": "dinf", "header_size": 8, "size": 36, "children":[ { "name": "dref", "header_size": 12, "size": 28, "children":[ { "name": "url ", "header_size": 12, "size": 12, "flags": 1, "location": "[local to file]" }] }] }, { "name": "stbl", "header_size": 8, "size": 46500, "children":[ { "name": "stsd", "header_size": 12, "size": 153, "entry_count": 1, "children":[ { "name": "avc1", "header_size": 8, "size": 137, "data_reference_index": 1, "width": 1920, "height": 1080, "compressor": "AVC Coding", "children":[ { "name": "avcC", "header_size": 8, "size": 51, "Configuration Version": 1, "Profile": "Main", "Profile Compatibility": 0, "Level": 41, "NALU Length Size": 4, "Sequence Parameter": "[27 4d 00 29 89 8b 60 3c 01 13 f2 e0 2d 40 40 40 4c 0c 00 17 70 00 05 dc 17 bd f0 50]", "Picture Parameter": "[28 ee 1f 20]" }] }] }, { "name": "stts", "header_size": 12, "size": 24, "entry_count": 1 }, { "name": "stss", "header_size": 12, "size": 444, "entry_count": 107 }, { "name": "sdtp", "header_size": 8, "size": 3471 }, { "name": "stsc", "header_size": 12, "size": 40, "entry_count": 2 }, { "name": "stsz", "header_size": 12, "size": 13856, "sample_size": 0, "sample_count": 3459 }, { "name": "stco", "header_size": 12, "size": 1400, "entry_count": 346 }, { "name": "ctts", "header_size": 12, "size": 27104, "entry_count": 3386 }] }] }] }] }, { "name": "trak", "header_size": 8, "size": 39691, "children":[ { "name": "tkhd", "header_size": 12, "size": 92, "flags": 3, "enabled": 1, "id": 2, "duration": 12971250, "width": 0.000000, "height": 0.000000 }, { "name": "edts", "header_size": 8, "size": 36, "children":[ { "name": "elst", "header_size": 12, "size": 28, "entry_count": 1, "entry/segment duration": 12971250, "entry/media time": 0, "entry/media rate": 1 }] }, { "name": "mdia", "header_size": 8, "size": 39475, "children":[ { "name": "mdhd", "header_size": 12, "size": 32, "timescale": 48000, "duration": 6919168, "duration(ms)": 144149, "language": "eng" }, { "name": "hdlr", "header_size": 12, "size": 68, "handler_type": "soun", "handler_name": "Mainconcept MP4 Sound Media Handler" }, { "name": "minf", "header_size": 8, "size": 39367, "children":[ { "name": "smhd", "header_size": 12, "size": 16, "balance": 0 }, { "name": "hdlr", "header_size": 12, "size": 51, "handler_type": "alis", "handler_name": "Alias Data Handler" }, { "name": "dinf", "header_size": 8, "size": 36, "children":[ { "name": "dref", "header_size": 12, "size": 28, "children":[ { "name": "url ", "header_size": 12, "size": 12, "flags": 1, "location": "[local to file]" }] }] }, { "name": "stbl", "header_size": 8, "size": 39256, "children":[ { "name": "stsd", "header_size": 12, "size": 103, "entry_count": 1, "children":[ { "name": "mp4a", "header_size": 8, "size": 87, "data_reference_index": 1, "channel_count": 2, "sample_size": 16, "sample_rate": 48000, "children":[ { "name": "esds", "header_size": 12, "size": 51, "children":[ { "name": "ESDescriptor", "header_size": 5, "size": 39, "es_id": 0, "stream_priority": 16, "children":[ { "name": "DecoderConfig", "header_size": 5, "size": 25, "stream_type": 5, "object_type": 64, "up_stream": 0, "buffer_size": 1128, "max_bitrate": 317624, "avg_bitrate": 317338, "DecoderSpecificInfo": "11 90 " }, { "name": "Descriptor:06", "header_size": 5, "size": 6 }] }] }] }] }, { "name": "stts", "header_size": 12, "size": 24, "entry_count": 1 }, { "name": "sdtp", "header_size": 8, "size": 6769 }, { "name": "stsc", "header_size": 12, "size": 3904, "entry_count": 324 }, { "name": "stsz", "header_size": 12, "size": 27048, "sample_size": 0, "sample_count": 6757 }, { "name": "stco", "header_size": 12, "size": 1400, "entry_count": 346 }] }] }] }, { "name": "udta", "header_size": 8, "size": 80, "children":[ { "name": "name", "header_size": 8, "size": 15 }, { "name": "titl", "header_size": 12, "size": 22, "language": "und", "value": "English" }, { "name": "tagc", "header_size": 8, "size": 35 }] }] }, { "name": "udta", "header_size": 8, "size": 58, "children":[ { "name": ".TIM", "header_size": 8, "size": 23 }, { "name": ".TSC", "header_size": 8, "size": 14 }, { "name": ".TSZ", "header_size": 8, "size": 13 }] }, { "name": "trak", "header_size": 8, "size": 33703, "children":[ { "name": "tkhd", "header_size": 12, "size": 92, "flags": 2, "enabled": 0, "id": 3, "duration": 12956473, "width": 0.000000, "height": 0.000000 }, { "name": "mdia", "header_size": 8, "size": 33489, "children":[ { "name": "mdhd", "header_size": 12, "size": 32, "timescale": 44100, "duration": 6349824, "duration(ms)": 143986, "language": "pol" }, { "name": "hdlr", "header_size": 12, "size": 33, "handler_type": "soun", "handler_name": "" }, { "name": "minf", "header_size": 8, "size": 33401, "children":[ { "name": "smhd", "header_size": 12, "size": 16, "balance": 0 }, { "name": "dinf", "header_size": 8, "size": 36, "children":[ { "name": "dref", "header_size": 12, "size": 28, "children":[ { "name": "url ", "header_size": 12, "size": 12, "flags": 1, "location": "[local to file]" }] }] }, { "name": "stbl", "header_size": 8, "size": 33341, "children":[ { "name": "stsd", "header_size": 12, "size": 103, "entry_count": 1, "children":[ { "name": "mp4a", "header_size": 8, "size": 87, "data_reference_index": 1, "channel_count": 2, "sample_size": 16, "sample_rate": 44100, "children":[ { "name": "esds", "header_size": 12, "size": 51, "children":[ { "name": "ESDescriptor", "header_size": 5, "size": 39, "es_id": 0, "stream_priority": 0, "children":[ { "name": "DecoderConfig", "header_size": 5, "size": 25, "stream_type": 5, "object_type": 64, "up_stream": 0, "buffer_size": 910, "max_bitrate": 276208, "avg_bitrate": 193117, "DecoderSpecificInfo": "12 10 " }, { "name": "Descriptor:06", "header_size": 5, "size": 6 }] }] }] }] }, { "name": "stts", "header_size": 12, "size": 24, "entry_count": 1 }, { "name": "stsz", "header_size": 12, "size": 24824, "sample_size": 0, "sample_count": 6201 }, { "name": "stsc", "header_size": 12, "size": 40, "entry_count": 2 }, { "name": "co64", "header_size": 12, "size": 8288, "entry_count": 1034 }, { "name": "sgpd", "header_size": 12, "size": 26, "version": 1, "grouping_type": "roll", "default_length": 2, "entry_count": 1, "entries": [ "[ff ff]" ] }, { "name": "sbgp", "header_size": 12, "size": 28, "grouping_type": "roll", "entry_count": 1 }] }] }, { "name": "elng", "header_size": 8, "size": 15 }] }, { "name": "edts", "header_size": 8, "size": 36, "children":[ { "name": "elst", "header_size": 12, "size": 28, "entry_count": 1, "entry/segment duration": 12956473, "entry/media time": 0, "entry/media rate": 1 }] }, { "name": "udta", "header_size": 8, "size": 78, "children":[ { "name": "name", "header_size": 8, "size": 14 }, { "name": "titl", "header_size": 12, "size": 21, "language": "und", "value": "Polish" }, { "name": "tagc", "header_size": 8, "size": 35 }] }] }, { "name": "trak", "header_size": 8, "size": 34851, "children":[ { "name": "tkhd", "header_size": 12, "size": 92, "flags": 2, "enabled": 0, "id": 4, "duration": 12316320, "width": 0.000000, "height": 0.000000 }, { "name": "mdia", "header_size": 8, "size": 34637, "children":[ { "name": "mdhd", "header_size": 12, "size": 32, "timescale": 48000, "duration": 6569984, "duration(ms)": 136874, "language": "deu" }, { "name": "hdlr", "header_size": 12, "size": 33, "handler_type": "soun", "handler_name": "" }, { "name": "minf", "header_size": 8, "size": 34549, "children":[ { "name": "smhd", "header_size": 12, "size": 16, "balance": 0 }, { "name": "dinf", "header_size": 8, "size": 36, "children":[ { "name": "dref", "header_size": 12, "size": 28, "children":[ { "name": "url ", "header_size": 12, "size": 12, "flags": 1, "location": "[local to file]" }] }] }, { "name": "stbl", "header_size": 8, "size": 34489, "children":[ { "name": "stsd", "header_size": 12, "size": 103, "entry_count": 1, "children":[ { "name": "mp4a", "header_size": 8, "size": 87, "data_reference_index": 1, "channel_count": 2, "sample_size": 16, "sample_rate": 48000, "children":[ { "name": "esds", "header_size": 12, "size": 51, "children":[ { "name": "ESDescriptor", "header_size": 5, "size": 39, "es_id": 0, "stream_priority": 0, "children":[ { "name": "DecoderConfig", "header_size": 5, "size": 25, "stream_type": 5, "object_type": 64, "up_stream": 0, "buffer_size": 955, "max_bitrate": 242184, "avg_bitrate": 194403, "DecoderSpecificInfo": "11 90 " }, { "name": "Descriptor:06", "header_size": 5, "size": 6 }] }] }] }] }, { "name": "stts", "header_size": 12, "size": 24, "entry_count": 1 }, { "name": "stsz", "header_size": 12, "size": 25684, "sample_size": 0, "sample_count": 6416 }, { "name": "stsc", "header_size": 12, "size": 40, "entry_count": 2 }, { "name": "co64", "header_size": 12, "size": 8576, "entry_count": 1070 }, { "name": "sgpd", "header_size": 12, "size": 26, "version": 1, "grouping_type": "roll", "default_length": 2, "entry_count": 1, "entries": [ "[ff ff]" ] }, { "name": "sbgp", "header_size": 12, "size": 28, "grouping_type": "roll", "entry_count": 1 }] }] }, { "name": "elng", "header_size": 8, "size": 15 }] }, { "name": "edts", "header_size": 8, "size": 36, "children":[ { "name": "elst", "header_size": 12, "size": 28, "entry_count": 1, "entry/segment duration": 12316320, "entry/media time": 0, "entry/media rate": 1 }] }, { "name": "udta", "header_size": 8, "size": 78, "children":[ { "name": "name", "header_size": 8, "size": 14 }, { "name": "titl", "header_size": 12, "size": 21, "language": "und", "value": "German" }, { "name": "tagc", "header_size": 8, "size": 35 }] }] }, { "name": "trak", "header_size": 8, "size": 33703, "children":[ { "name": "tkhd", "header_size": 12, "size": 92, "flags": 2, "enabled": 0, "id": 5, "duration": 12956473, "width": 0.000000, "height": 0.000000 }, { "name": "mdia", "header_size": 8, "size": 33489, "children":[ { "name": "mdhd", "header_size": 12, "size": 32, "timescale": 44100, "duration": 6349824, "duration(ms)": 143986, "language": "fra" }, { "name": "hdlr", "header_size": 12, "size": 33, "handler_type": "soun", "handler_name": "" }, { "name": "minf", "header_size": 8, "size": 33401, "children":[ { "name": "smhd", "header_size": 12, "size": 16, "balance": 0 }, { "name": "dinf", "header_size": 8, "size": 36, "children":[ { "name": "dref", "header_size": 12, "size": 28, "children":[ { "name": "url ", "header_size": 12, "size": 12, "flags": 1, "location": "[local to file]" }] }] }, { "name": "stbl", "header_size": 8, "size": 33341, "children":[ { "name": "stsd", "header_size": 12, "size": 103, "entry_count": 1, "children":[ { "name": "mp4a", "header_size": 8, "size": 87, "data_reference_index": 1, "channel_count": 2, "sample_size": 16, "sample_rate": 44100, "children":[ { "name": "esds", "header_size": 12, "size": 51, "children":[ { "name": "ESDescriptor", "header_size": 5, "size": 39, "es_id": 0, "stream_priority": 0, "children":[ { "name": "DecoderConfig", "header_size": 5, "size": 25, "stream_type": 5, "object_type": 64, "up_stream": 0, "buffer_size": 903, "max_bitrate": 276992, "avg_bitrate": 193186, "DecoderSpecificInfo": "12 10 " }, { "name": "Descriptor:06", "header_size": 5, "size": 6 }] }] }] }] }, { "name": "stts", "header_size": 12, "size": 24, "entry_count": 1 }, { "name": "stsz", "header_size": 12, "size": 24824, "sample_size": 0, "sample_count": 6201 }, { "name": "stsc", "header_size": 12, "size": 40, "entry_count": 2 }, { "name": "co64", "header_size": 12, "size": 8288, "entry_count": 1034 }, { "name": "sgpd", "header_size": 12, "size": 26, "version": 1, "grouping_type": "roll", "default_length": 2, "entry_count": 1, "entries": [ "[ff ff]" ] }, { "name": "sbgp", "header_size": 12, "size": 28, "grouping_type": "roll", "entry_count": 1 }] }] }, { "name": "elng", "header_size": 8, "size": 15 }] }, { "name": "edts", "header_size": 8, "size": 36, "children":[ { "name": "elst", "header_size": 12, "size": 28, "entry_count": 1, "entry/segment duration": 12956473, "entry/media time": 0, "entry/media rate": 1 }] }, { "name": "udta", "header_size": 8, "size": 78, "children":[ { "name": "name", "header_size": 8, "size": 14 }, { "name": "titl", "header_size": 12, "size": 21, "language": "und", "value": "French" }, { "name": "tagc", "header_size": 8, "size": 35 }] }] }] }, { "name": "free", "header_size": 8, "size": 276210 } ]

Please let me know if any further details are required.

[dio-az]

Hey @kousthub97, at first glance I can see that the moov is at the end of the file, after 4 separate mdat. The module expects the moov to be at the beginning followed by mdat.

[kousthub97]

Hi @diogoazevedos
I don't think so it is due to the moov box at the end of the file

I had tested with another file where moov at the end of the file which plays fine both in HLS/DASH.
mp4dump

[ { "name": "ftyp", "header_size": 8, "size": 32, "major_brand": "isom", "minor_version": 512, "compatible_brand": "isom", "compatible_brand": "iso2", "compatible_brand": "avc1", "compatible_brand": "mp41" }, { "name": "free", "header_size": 8, "size": 8 }, { "name": "mdat", "header_size": 8, "size": 392566717 }, { "name": "moov", "header_size": 8, "size": 809376, "children":[ { "name": "mvhd", "header_size": 12, "size": 108, "timescale": 1000, "duration": 1167209, "duration(ms)": 1167209 }, { "name": "trak", "header_size": 8, "size": 447107, "children":[ { "name": "tkhd", "header_size": 12, "size": 92, "flags": 3, "enabled": 1, "id": 1, "duration": 1167209, "width": 1280.000000, "height": 720.000000 }, { "name": "edts", "header_size": 8, "size": 36, "children":[ { "name": "elst", "header_size": 12, "size": 28, "entry_count": 1, "entry/segment duration": 1167209, "entry/media time": 500, "entry/media rate": 1 }] }, { "name": "tref", "header_size": 8, "size": 20, "children":[ { "name": "tmcd", "header_size": 8, "size": 12 }] }, { "name": "mdia", "header_size": 8, "size": 446951, "children":[ { "name": "mdhd", "header_size": 12, "size": 32, "timescale": 11988, "duration": 13992500, "duration(ms)": 1167208, "language": "eng" }, { "name": "hdlr", "header_size": 12, "size": 58, "handler_type": "vide", "handler_name": "Apple Video Media Handler" }, { "name": "minf", "header_size": 8, "size": 446853, "children":[ { "name": "vmhd", "header_size": 12, "size": 20, "flags": 1, "graphics_mode": 0, "op_color": "0000,0000,0000" }, { "name": "dinf", "header_size": 8, "size": 36, "children":[ { "name": "dref", "header_size": 12, "size": 28, "children":[ { "name": "url ", "header_size": 12, "size": 12, "flags": 1, "location": "[local to file]" }] }] }, { "name": "stbl", "header_size": 8, "size": 446789, "children":[ { "name": "stsd", "header_size": 12, "size": 145, "entry_count": 1, "children":[ { "name": "avc1", "header_size": 8, "size": 129, "data_reference_index": 1, "width": 1280, "height": 720, "compressor": "", "children":[ { "name": "avcC", "header_size": 8, "size": 43, "Configuration Version": 1, "Profile": "Main", "Profile Compatibility": 64, "Level": 31, "NALU Length Size": 4, "Sequence Parameter": "[27 4d 40 1f a9 18 0a 00 b7 60 0d 40 40 40 6d b0 ad 7b df 01]", "Picture Parameter": "[28 de 09 c8]" }] }] }, { "name": "stts", "header_size": 12, "size": 24, "entry_count": 1 }, { "name": "stss", "header_size": 12, "size": 1308, "entry_count": 323 }, { "name": "ctts", "header_size": 12, "size": 221352, "entry_count": 27667 }, { "name": "stsc", "header_size": 12, "size": 40, "entry_count": 2 }, { "name": "stsz", "header_size": 12, "size": 111960, "sample_size": 0, "sample_count": 27985 }, { "name": "stco", "header_size": 12, "size": 111952, "entry_count": 27984 }] }] }] }] }, { "name": "trak", "header_size": 8, "size": 361499, "children":[ { "name": "tkhd", "header_size": 12, "size": 92, "flags": 3, "enabled": 1, "id": 2, "duration": 1167209, "width": 0.000000, "height": 0.000000 }, { "name": "edts", "header_size": 8, "size": 36, "children":[ { "name": "elst", "header_size": 12, "size": 28, "entry_count": 1, "entry/segment duration": 1167209, "entry/media time": 0, "entry/media rate": 1 }] }, { "name": "mdia", "header_size": 8, "size": 361363, "children":[ { "name": "mdhd", "header_size": 12, "size": 32, "timescale": 48000, "duration": 56026010, "duration(ms)": 1167208, "language": "eng" }, { "name": "hdlr", "header_size": 12, "size": 58, "handler_type": "soun", "handler_name": "Apple Sound Media Handler" }, { "name": "minf", "header_size": 8, "size": 361265, "children":[ { "name": "smhd", "header_size": 12, "size": 16, "balance": 0 }, { "name": "dinf", "header_size": 8, "size": 36, "children":[ { "name": "dref", "header_size": 12, "size": 28, "children":[ { "name": "url ", "header_size": 12, "size": 12, "flags": 1, "location": "[local to file]" }] }] }, { "name": "stbl", "header_size": 8, "size": 361205, "children":[ { "name": "stsd", "header_size": 12, "size": 103, "entry_count": 1, "children":[ { "name": "mp4a", "header_size": 8, "size": 87, "data_reference_index": 1, "channel_count": 2, "sample_size": 16, "sample_rate": 48000, "children":[ { "name": "esds", "header_size": 12, "size": 51, "children":[ { "name": "ESDescriptor", "header_size": 5, "size": 39, "es_id": 2, "stream_priority": 0, "children":[ { "name": "DecoderConfig", "header_size": 5, "size": 25, "stream_type": 5, "object_type": 64, "up_stream": 0, "buffer_size": 0, "max_bitrate": 105653, "avg_bitrate": 105653, "DecoderSpecificInfo": "11 90 " }, { "name": "Descriptor:06", "header_size": 5, "size": 6 }] }] }] }] }, { "name": "stts", "header_size": 12, "size": 32, "entry_count": 2 }, { "name": "stsc", "header_size": 12, "size": 30184, "entry_count": 2514 }, { "name": "stsz", "header_size": 12, "size": 218872, "sample_size": 0, "sample_count": 54713 }, { "name": "stco", "header_size": 12, "size": 111952, "entry_count": 27984 }, { "name": "sgpd", "header_size": 12, "size": 26, "version": 1, "grouping_type": "roll", "default_length": 2, "entry_count": 1, "entries": [ "[ff ff]" ] }, { "name": "sbgp", "header_size": 12, "size": 28, "grouping_type": "roll", "entry_count": 1 }] }] }] }] }, { "name": "trak", "header_size": 8, "size": 442, "children":[ { "name": "tkhd", "header_size": 12, "size": 92, "flags": 2, "enabled": 0, "id": 3, "duration": 1167209, "width": 0.000000, "height": 0.000000 }, { "name": "edts", "header_size": 8, "size": 36, "children":[ { "name": "elst", "header_size": 12, "size": 28, "entry_count": 1, "entry/segment duration": 1167209, "entry/media time": 0, "entry/media rate": 1 }] }, { "name": "mdia", "header_size": 8, "size": 306, "children":[ { "name": "mdhd", "header_size": 12, "size": 32, "timescale": 11988, "duration": 13992500, "duration(ms)": 1167208, "language": "```" }, { "name": "hdlr", "header_size": 12, "size": 58, "handler_type": "tmcd", "handler_name": "Apple Video Media Handler" }, { "name": "minf", "header_size": 8, "size": 208, "children":[ { "name": "nmhd", "header_size": 12, "size": 12 }, { "name": "dinf", "header_size": 8, "size": 36, "children":[ { "name": "dref", "header_size": 12, "size": 28, "children":[ { "name": "url ", "header_size": 12, "size": 12, "flags": 1, "location": "[local to file]" }] }] }, { "name": "stbl", "header_size": 8, "size": 152, "children":[ { "name": "stsd", "header_size": 12, "size": 52, "entry_count": 1, "children":[ { "name": "tmcd", "header_size": 8, "size": 36, "data_reference_index": 1 }] }, { "name": "stts", "header_size": 12, "size": 24, "entry_count": 1 }, { "name": "stsc", "header_size": 12, "size": 28, "entry_count": 1 }, { "name": "stsz", "header_size": 12, "size": 20, "sample_size": 4, "sample_count": 1 }, { "name": "stco", "header_size": 12, "size": 20, "entry_count": 1 }] }] }] }] }, { "name": "udta", "header_size": 8, "size": 212, "children":[ { "name": "meta", "header_size": 12, "size": 204, "children":[ { "name": "hdlr", "header_size": 12, "size": 33, "handler_type": "mdir", "handler_name": "" }, { "name": "ilst", "header_size": 8, "size": 159, "children":[ { "name": ".too", "header_size": 8, "size": 37, "children":[ { "name": "data", "header_size": 8, "size": 29, "type": 1, "lang": 0, "value": "Lavf58.29.100" }] }, { "name": ".cmt", "header_size": 8, "size": 114, "children":[ { "name": "data", "header_size": 8, "size": 106, "type": 1, "lang": 0, "value": "Source ID = 060a2b340101010101010f00-13-00-00-00-{7fff53f0f681-621d-0011-060e2b347f7f2a80}" }] }] }] }] }] } ]
Below are the difference observing with not working:

1. major_band is mp42
2. looks like it is having extended box with 64 bit size(Not sure kaltura will support this)

Also I had tried by changing the vod_initial_read_size to 20MB and playback started working(Not sure what is the impact and performance issue will trigger by changing this)

Please let me know if not working file is required will share.

[dio-az]

Hey @kousthub97,

I checked this further and, as I mentioned earlier, the module expects the moov to be at the beginning.

Looking at why it works for the other file and worked in general when initial_read_size was increased to 20MB: When moov isn't found in the initial read, the module seeks forward box-by-box to find it, but is limited to 4 retries. As the working asset is not as fragmented as the non-working one, the module manages to find moov within budget, but for the non-working one 4k is too little and it exhausts its retries, but with 20MB it manages to skip over more boxes finally finding moov.

Pulling 20MB from origin on every cache miss is a costly trade-off. The ultimate solution is to remux the files as fast-start. This moves moov to the beginning of the file, making sure it's found on the first read without retries.