Why does Quicktime not play this mp4 correctly
I can create an mp4 file (recording) from Belkin's @TV app but that file will not play correctly in Quicktime (or RealPlayer or iMovie, etc.). While the video playback seems fine, the audio plays a couple of seconds, at "chipmonk" speed, and then there is no sound out. However, if I move the playhead to any random place in the recording I can then hear another couple of seconds of audio, as before ("chipmonk" speed), and then silence. The VLC player will, however, play the file correctly.
So, seeing that the file itself was not bad, I decided to try Handbrake to re-encode the recording. And, to my surprise, Handbrake was able to handle the file correctly and produce an mp4 file that Quicktime (and the others) can play.
I don't know enough about these mp4 files to grasp what is wrong with the original Belkin output. The Quicktime inspector reports that the Format is
H.264, 352 x 240
AAC, 32000 Hz, Stereo (L R)
FPS: 25.37
Any ideas? (Is there additional data I can look at about this file?)
I'm running the current version of Mavericks and Quicktime 10.3.
Jon Walker wrote:
Use a dedicated utility like MediaInfo to screen more information about the file and how each track is encoded.
Another user in the Belkin forum suggested that I look at the recording's header info, and pointed me to AtomicParsley, which I have now run (using some basic terminal commands).
This is what it reports for the initial, Belkin-app produced file:
Atom ftyp @ 0 of size: 24, ends @ 24
Atom mdat @ 24 of size: 195643428, ends @ 195643452
Atom moov @ 195643452 of size: 772515, ends @ 196415967
Atom mvhd @ 195643460 of size: 108, ends @ 195643568
Atom iods @ 195643568 of size: 33, ends @ 195643601
Atom trak @ 195643601 of size: 674653, ends @ 196318254
Atom tkhd @ 195643609 of size: 92, ends @ 195643701
Atom mdia @ 195643701 of size: 674553, ends @ 196318254
Atom mdhd @ 195643709 of size: 32, ends @ 195643741
Atom hdlr @ 195643741 of size: 33, ends @ 195643774
Atom minf @ 195643774 of size: 674480, ends @ 196318254
Atom vmhd @ 195643782 of size: 20, ends @ 195643802
Atom dinf @ 195643802 of size: 36, ends @ 195643838
Atom dref @ 195643810 of size: 28, ends @ 195643838
Atom stbl @ 195643838 of size: 674416, ends @ 196318254
Atom stsd @ 195643846 of size: 140, ends @ 195643986
Atom avc1 @ 195643862 of size: 124, ends @ 195643986
Atom avcC @ 195643948 of size: 38, ends @ 195643986
Atom stts @ 195643986 of size: 403840, ends @ 196047826
Atom stss @ 196047826 of size: 8476, ends @ 196056302
Atom stsc @ 196056302 of size: 28, ends @ 196056330
Atom stsz @ 196056330 of size: 253724, ends @ 196310054
Atom stco @ 196310054 of size: 8200, ends @ 196318254
Atom trak @ 196318254 of size: 97713, ends @ 196415967
Atom tkhd @ 196318262 of size: 92, ends @ 196318354
Atom edts @ 196318354 of size: 48, ends @ 196318402
Atom elst @ 196318362 of size: 40, ends @ 196318402
Atom mdia @ 196318402 of size: 97565, ends @ 196415967
Atom mdhd @ 196318410 of size: 32, ends @ 196318442
Atom hdlr @ 196318442 of size: 33, ends @ 196318475
Atom minf @ 196318475 of size: 97492, ends @ 196415967
Atom smhd @ 196318483 of size: 16, ends @ 196318499
Atom dinf @ 196318499 of size: 36, ends @ 196318535
Atom dref @ 196318507 of size: 28, ends @ 196318535
Atom stbl @ 196318535 of size: 97432, ends @ 196415967
Atom stsd @ 196318543 of size: 92, ends @ 196318635
Atom mp4a @ 196318559 of size: 76, ends @ 196318635
Atom esds @ 196318595 of size: 40, ends @ 196318635
Atom stts @ 196318635 of size: 1088, ends @ 196319723
Atom stss @ 196319723 of size: 16, ends @ 196319739
Atom stsc @ 196319739 of size: 532, ends @ 196320271
Atom stsz @ 196320271 of size: 88328, ends @ 196408599
Atom stco @ 196408599 of size: 7368, ends @ 196415967
Total size: 196415967 bytes; 42 atoms total. AtomicParsley version: 0.9.0 (utf8)
Media data: 195643428 bytes; 772539 bytes all other atoms (0.393% atom overhead).
Total free atom space: 0 bytes; 0.000% waste.
Movie duration: 2116.513 seconds (35:16.51) - 739.49* kbp/sec bitrate (*=approximate)
Low-level details. Total tracks: 2
Trk Type Handler Kind Lang Bytes
1 vide [none listed] avc1 eng 178711864
675.58* kbp/s 2116.243 sec AVC Main Profile, Level 3.1 352x240 (330 macroblocks)
2 soun [none listed] mp4a eng 16931556
64.00* kbp/s 2116.513 sec MPEG-4 AAC Low Complexity Profile channels: [2]
Jon Walker wrote:
In most cases, users want answers but are unable or unwilling to provide the encoding information to explain most problems, it is usually simpler to ask users to post a sample file for examination on my own computer.
I have the equivalent for the recording's Handbrake output. I did a file compare but there were enough differences (and I'm not a technical person) so I could not spot which of the differences mattered. For example, I thought that the fact that there is "none listed" for the sound handler looked like an obvious clue until I saw that same thing in the Handbrake output.
Here is the Handbrake data:
Atom ftyp @ 0 of size: 28, ends @ 28
Atom free @ 28 of size: 132, ends @ 160
Atom mdat @ 160 of size: 100944363, ends @ 100944523
Atom moov @ 100944523 of size: 1606698, ends @ 102551221
Atom mvhd @ 100944531 of size: 108, ends @ 100944639
Atom iods @ 100944639 of size: 24, ends @ 100944663
Atom trak @ 100944663 of size: 1288497, ends @ 102233160
Atom tkhd @ 100944671 of size: 92, ends @ 100944763
Atom mdia @ 100944763 of size: 1288361, ends @ 102233124
Atom mdhd @ 100944771 of size: 32, ends @ 100944803
Atom hdlr @ 100944803 of size: 33, ends @ 100944836
Atom minf @ 100944836 of size: 1288288, ends @ 102233124
Atom vmhd @ 100944844 of size: 20, ends @ 100944864
Atom dinf @ 100944864 of size: 36, ends @ 100944900
Atom dref @ 100944872 of size: 28, ends @ 100944900
Atom stbl @ 100944900 of size: 1288224, ends @ 102233124
Atom stsd @ 100944908 of size: 186, ends @ 100945094
Atom avc1 @ 100944924 of size: 170, ends @ 100945094
Atom avcC @ 100945010 of size: 50, ends @ 100945060
Atom colr @ 100945060 of size: 18, ends @ 10094507 ~
Atom stts @ 100945094 of size: 403832, ends @ 101348926
Atom stsz @ 101348926 of size: 253724, ends @ 101602650
Atom stsc @ 101602650 of size: 24436, ends @ 101627086
Atom stco @ 101627086 of size: 56712, ends @ 101683798
Atom ctts @ 101683798 of size: 484536, ends @ 102168334
Atom stss @ 102168334 of size: 1352, ends @ 102169686
Atom sdtp @ 102169686 of size: 63438, ends @ 102233124
Atom edts @ 102233124 of size: 36, ends @ 102233160
Atom elst @ 102233132 of size: 28, ends @ 102233160
Atom trak @ 102233160 of size: 317950, ends @ 102551110
Atom tkhd @ 102233168 of size: 92, ends @ 102233260
Atom mdia @ 102233260 of size: 317828, ends @ 102551088
Atom mdhd @ 102233268 of size: 32, ends @ 102233300
Atom hdlr @ 102233300 of size: 33, ends @ 102233333
Atom minf @ 102233333 of size: 317755, ends @ 102551088
Atom smhd @ 102233341 of size: 16, ends @ 102233357
Atom dinf @ 102233357 of size: 36, ends @ 102233393
Atom dref @ 102233365 of size: 28, ends @ 102233393
Atom stbl @ 102233393 of size: 317695, ends @ 102551088
Atom stsd @ 102233401 of size: 103, ends @ 102233504
Atom mp4a @ 102233417 of size: 87, ends @ 102233504
Atom esds @ 102233453 of size: 51, ends @ 102233504
Atom stts @ 102233504 of size: 24, ends @ 102233528
Atom stsz @ 102233528 of size: 264600, ends @ 102498128
Atom stsc @ 102498128 of size: 28, ends @ 102498156
Atom stco @ 102498156 of size: 52932, ends @ 102551088
Atom udta @ 102551088 of size: 22, ends @ 102551110
Atom name @ 102551096 of size: 14, ends @ 102551110
Atom udta @ 102551110 of size: 111, ends @ 102551221
Atom meta @ 102551118 of size: 103, ends @ 102551221
Atom hdlr @ 102551130 of size: 33, ends @ 102551163
Atom ilst @ 102551163 of size: 58, ends @ 102551221
Atom ©too @ 102551171 of size: 50, ends @ 102551221
Atom data @ 102551179 of size: 42, ends @ 102551221
Atom free @ 102551221 of size: 132, ends @ 102551353
~ denotes an unknown atom
Total size: 102551353 bytes; 54 atoms total. AtomicParsley version: 0.9.0 (utf8)
Media data: 100944363 bytes; 1606990 bytes all other atoms (1.567% atom overhead).
Total free atom space: 264 bytes; 0.000% waste.
Movie duration: 2116.640 seconds (35:16.64) - 381.53* kbp/sec bitrate (*=approximate)
Low-level details. Total tracks: 2
Trk Type Handler Kind Lang Bytes
1 vide [none listed] avc1 und 65533744
247.74* kbp/s 2116.243 sec AVC Main Profile, Level 4 352x240 (330 macroblocks)
2 soun [none listed] mp4a eng 35410611
133.84 kbp/s 2116.640 sec MPEG-4 AAC Low Complexity Profile channels: [2]
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