telegramdesktop
mp4 files with large headers dont stream
Steps to reproduce
Try to play back a mp4 file with a large header (>8mb it seems) and it won't stream.
For example https://t.me/moov_test has two files containing the same video. They are encoded the same except gop size was changed to get a moov atom of different size. One streams and one will buffer for a couple seconds and change to where you are forced to download it completely before you can play it back. This affects lots of long videos since the header grows along with the video, and theres no real workaround other than being forced to completely reencode with special settings to try and make the header small enough so telegram streams it.
AtomicParsley output for streamable file
Atom ftyp @ 0 of size: 32, ends @ 32
Atom moov @ 32 of size: 5128999, ends @ 5129031
Atom mvhd @ 40 of size: 108, ends @ 148
Atom trak @ 148 of size: 3259056, ends @ 3259204
Atom tkhd @ 156 of size: 92, ends @ 248
Atom edts @ 248 of size: 48, ends @ 296
Atom elst @ 256 of size: 40, ends @ 296
Atom mdia @ 296 of size: 3258908, ends @ 3259204
Atom mdhd @ 304 of size: 32, ends @ 336
Atom hdlr @ 336 of size: 45, ends @ 381
Atom minf @ 381 of size: 3258823, ends @ 3259204
Atom vmhd @ 389 of size: 20, ends @ 409
Atom dinf @ 409 of size: 36, ends @ 445
Atom dref @ 417 of size: 28, ends @ 445
Atom stbl @ 445 of size: 3258759, ends @ 3259204
Atom stsd @ 453 of size: 195, ends @ 648
Atom avc1 @ 469 of size: 179, ends @ 648
Atom avcC @ 555 of size: 57, ends @ 612
Atom pasp @ 612 of size: 16, ends @ 628 ~
Atom stts @ 648 of size: 24, ends @ 672
Atom ctts @ 672 of size: 2159584, ends @ 2160256
Atom stss @ 2160256 of size: 232, ends @ 2160488
Atom stsc @ 2160488 of size: 10024, ends @ 2170512
Atom stsz @ 2170512 of size: 1080020, ends @ 3250532
Atom stco @ 3250532 of size: 8672, ends @ 3259204
Atom trak @ 3259204 of size: 1869729, ends @ 5128933
Atom tkhd @ 3259212 of size: 92, ends @ 3259304
Atom edts @ 3259304 of size: 36, ends @ 3259340
Atom elst @ 3259312 of size: 28, ends @ 3259340
Atom mdia @ 3259340 of size: 1869593, ends @ 5128933
Atom mdhd @ 3259348 of size: 32, ends @ 3259380
Atom hdlr @ 3259380 of size: 45, ends @ 3259425
Atom minf @ 3259425 of size: 1869508, ends @ 5128933
Atom smhd @ 3259433 of size: 16, ends @ 3259449
Atom dinf @ 3259449 of size: 36, ends @ 3259485
Atom dref @ 3259457 of size: 28, ends @ 3259485
Atom stbl @ 3259485 of size: 1869448, ends @ 5128933
Atom stsd @ 3259493 of size: 114, ends @ 3259607
Atom mp4a @ 3259509 of size: 98, ends @ 3259607
Atom esds @ 3259545 of size: 42, ends @ 3259587
Atom btrt @ 3259587 of size: 20, ends @ 3259607 ~
Atom stts @ 3259607 of size: 64, ends @ 3259671
Atom stsc @ 3259671 of size: 40, ends @ 3259711
Atom stsz @ 3259711 of size: 1860496, ends @ 5120207
Atom stco @ 5120207 of size: 8672, ends @ 5128879
Atom sgpd @ 5128879 of size: 26, ends @ 5128905 ~
Atom sbgp @ 5128905 of size: 28, ends @ 5128933
Atom udta @ 5128933 of size: 98, ends @ 5129031
Atom meta @ 5128941 of size: 90, ends @ 5129031
Atom hdlr @ 5128953 of size: 33, ends @ 5128986
Atom ilst @ 5128986 of size: 45, ends @ 5129031
Atom ©too @ 5128994 of size: 37, ends @ 5129031
Atom data @ 5129002 of size: 29, ends @ 5129031
Atom mdat @ 5129031 of size: 249986374, ends @ 255115405
Atom free @ 255115405 of size: 8, ends @ 255115413
Atom free @ 255115413 of size: 73, ends @ 255115486
AtomicParsley output for non-streamable file
Atom ftyp @ 0 of size: 32, ends @ 32
Atom moov @ 32 of size: 8951143, ends @ 8951175
Atom mvhd @ 40 of size: 108, ends @ 148
Atom trak @ 148 of size: 4212664, ends @ 4212812
Atom tkhd @ 156 of size: 92, ends @ 248
Atom edts @ 248 of size: 48, ends @ 296
Atom elst @ 256 of size: 40, ends @ 296
Atom mdia @ 296 of size: 4212516, ends @ 4212812
Atom mdhd @ 304 of size: 32, ends @ 336
Atom hdlr @ 336 of size: 45, ends @ 381
Atom minf @ 381 of size: 4212431, ends @ 4212812
Atom vmhd @ 389 of size: 20, ends @ 409
Atom dinf @ 409 of size: 36, ends @ 445
Atom dref @ 417 of size: 28, ends @ 445
Atom stbl @ 445 of size: 4212367, ends @ 4212812
Atom stsd @ 453 of size: 195, ends @ 648
Atom avc1 @ 469 of size: 179, ends @ 648
Atom avcC @ 555 of size: 57, ends @ 612
Atom pasp @ 612 of size: 16, ends @ 628 ~
Atom stts @ 648 of size: 24, ends @ 672
Atom stss @ 672 of size: 108020, ends @ 108692
Atom ctts @ 108692 of size: 1944032, ends @ 2052724
Atom stsc @ 2052724 of size: 40, ends @ 2052764
Atom stsz @ 2052764 of size: 1080028, ends @ 3132792
Atom stco @ 3132792 of size: 1080020, ends @ 4212812
Atom trak @ 4212812 of size: 4738265, ends @ 8951077
Atom tkhd @ 4212820 of size: 92, ends @ 4212912
Atom edts @ 4212912 of size: 36, ends @ 4212948
Atom elst @ 4212920 of size: 28, ends @ 4212948
Atom mdia @ 4212948 of size: 4738129, ends @ 8951077
Atom mdhd @ 4212956 of size: 32, ends @ 4212988
Atom hdlr @ 4212988 of size: 45, ends @ 4213033
Atom minf @ 4213033 of size: 4738044, ends @ 8951077
Atom smhd @ 4213041 of size: 16, ends @ 4213057
Atom dinf @ 4213057 of size: 36, ends @ 4213093
Atom dref @ 4213065 of size: 28, ends @ 4213093
Atom stbl @ 4213093 of size: 4737984, ends @ 8951077
Atom stsd @ 4213101 of size: 126, ends @ 4213227
Atom mp4a @ 4213117 of size: 110, ends @ 4213227
Atom esds @ 4213153 of size: 54, ends @ 4213207
Atom btrt @ 4213207 of size: 20, ends @ 4213227 ~
Atom stts @ 4213227 of size: 64, ends @ 4213291
Atom stsc @ 4213291 of size: 1797220, ends @ 6010511
Atom stsz @ 6010511 of size: 1860492, ends @ 7871003
Atom stco @ 7871003 of size: 1080020, ends @ 8951023
Atom sgpd @ 8951023 of size: 26, ends @ 8951049 ~
Atom sbgp @ 8951049 of size: 28, ends @ 8951077
Atom udta @ 8951077 of size: 98, ends @ 8951175
Atom meta @ 8951085 of size: 90, ends @ 8951175
Atom hdlr @ 8951097 of size: 33, ends @ 8951130
Atom ilst @ 8951130 of size: 45, ends @ 8951175
Atom ©too @ 8951138 of size: 37, ends @ 8951175
Atom data @ 8951146 of size: 29, ends @ 8951175
Atom free @ 8951175 of size: 8, ends @ 8951183
Atom mdat @ 8951183 of size: 578061859, ends @ 587013042
Expected behaviour
Both files should stream in telegram without having to be downloaded first
Actual behaviour
The file with a large header doesnt stream
Operating system
windows 10 pro 20h2
Version of Telegram Desktop
4.0.2
Installation source
Static binary from official website
Logs
No response
Hey there!
This issue was inactive for a long time and will be automatically closed in 30 days if there isn't any further activity. We therefore assume that the user has lost interest or resolved the problem on their own.
Don't worry though; if this is an error, let us know with a comment and we'll be happy to reopen the issue.
Thanks!
![github-actions[bot] avatar](https://avatars.githubusercontent.com/in/15368?v=4 "Published by a pub.dev verified publisher"){kind=small}
Hey there!
This issue was inactive for a long time and will be automatically closed in 30 days if there isn't any further activity. We therefore assume that the user has lost interest or resolved the problem on their own.
Don't worry though; if this is an error, let us know with a comment and we'll be happy to reopen the issue.
Thanks!
Hey there!
This issue was inactive for a long time and will be automatically closed in 30 days if there isn't any further activity. We therefore assume that the user has lost interest or resolved the problem on their own.
Don't worry though; if this is an error, let us know with a comment and we'll be happy to reopen the issue.
Thanks!
Hey there!
This issue was inactive for a long time and will be automatically closed in 30 days if there isn't any further activity. We therefore assume that the user has lost interest or resolved the problem on their own.
Don't worry though; if this is an error, let us know with a comment and we'll be happy to reopen the issue.
Thanks!
yeah, sorry, streaming player currently can't support streaming of video with larger-than-8mb header size.
TDesktop tries to start playback of the file, but if it's forced to download more than 8 mb to even get the first frame, it is considered non-streamable.