Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. |
17th January 2022, 11:49 | #1 | Link |
Registered User
Join Date: Nov 2020
Posts: 2
|
Some AVC files unplayable in Quicktime
It has happened to me a few times that an h.264 MP4 file will not play in Quicktime player, but does in most other software. When I press play, there's is a long pause, and after a few seconds the elapsed time starts to count up. The video freezes on one of the first frames, and the audio plays in the background. I'm trying to find out what would cause it not to play.
I have tried remuxing a file, but that did not help. Removing the audio didn't help either. One common theme seems to be they were encoded by Lavf58.12.100 (other versions work fine) Here is some technical info from one example file that doesn't play: Code:
General Complete name : /Users/joe/stage/corrupt.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 527 MiB Duration : 40 min 39 s Overall bit rate : 1 812 kb/s Encoded date : UTC 2020-08-08 11:08:03 Tagged date : UTC 2020-08-08 11:08:03 major_brand : isom minor_version : 0 compatible_brands : isommp42 creation_time : 2020-08-08T11:08:03.000000Z encoder : Lavf58.12.100 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L3.1 Format settings : CABAC / 4 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 4 frames Format settings, GOP : M=1, N=12 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 40 min 39 s Bit rate : 1 614 kb/s Width : 960 pixels Height : 544 pixels Display aspect ratio : 16:9 Original display aspect ratio : 16:9 Frame rate mode : Variable Frame rate : 23.976 (23976/1000) FPS Minimum frame rate : 11.987 FPS Maximum frame rate : 59.733 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.129 Stream size : 469 MiB (89%) Language : English Encoded date : UTC 2020-08-08 11:08:03 Tagged date : UTC 2020-08-08 11:08:03 Codec configuration box : avcC Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 40 min 39 s Bit rate mode : Constant Bit rate : 192 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 44.1 kHz Frame rate : 43.066 FPS (1024 SPF) Compression mode : Lossy Stream size : 55.8 MiB (11%) Language : English Default : Yes Alternate group : 1 Encoded date : UTC 2020-08-08 11:08:03 Tagged date : UTC 2020-08-08 11:08:03 https://pastebin.com/wW2kYZPC avcC header (extradata) of MP4 file: Code:
61766343 0142C01F FFE20020 6742C01F 95A03C04 5B011000 003E9000 0EA60E00 000493E0 000493E1 BBCB8280 00176742 C01F5680 F0116C04 40000003 00400000 0E03C60C A8020004 68CE3C80 00046848 E3C8 https://pastebin.com/9RDB90gC It has been suggested that Quicktime Player might not support 8x8 macroblocks, or multiple b-frames. But here is a video which I think was encoded with both those features, and it plays fine in QT https://www.sendspace.com/file/59pn6x Code:
6.2: sps->direct_8x8_inference_flag: 1 6.4: pps->transform_8x8_mode_flag: 1 4.2: pps->weighted_bipred_idc: 2 |
Thread Tools | Search this Thread |
Display Modes | |
|
|