Opened 4 years ago

Closed 4 years ago

Last modified 4 years ago

#2708 closed defect (fixed)

Muxing H.264+AAC in M4V results in initial empty edits

Reported by: MarkZV Owned by:
Priority: normal Component: avformat
Version: git-master Keywords: regression mov
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Muxing H.264+AAC in M4V (ipod muxer) results in initial empty edits in the video and audio track edit lists. It works as expected (no empty edits) with MP4 output, and with ffmpeg 1.2.1.

An empty edit in a track's edit list indicates a time with no corresponding media, and is useful if the audio should begin after the video or vice versa. However in the example below, ffmpeg adds empty edits on both the audio and video tracks, which means that there is no media at all for the first several milliseconds.

$ ffmpeg -v 9 -loglevel 99 -filter_complex "testsrc=n=2;aevalsrc=sin(440*2*PI*t)" -pix_fmt yuv420p -t 3 out.m4v
ffmpeg version 1.1.git-bbe26ef Copyright (c) 2000-2013 the FFmpeg developers
  built on Jun 24 2013 14:49:49 with gcc 4.2.1 (GCC) (Apple Inc. build 5666) (dot 3)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-gnutls --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/gcc-4.2 --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-nonfree --enable-libfdk-aac --enable-libfaac
  libavutil      52. 37.101 / 52. 37.101
  libavcodec     55. 17.100 / 55. 17.100
  libavformat    55.  9.100 / 55.  9.100
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 77.101 /  3. 77.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '99'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument 'testsrc=n=2;aevalsrc=sin(440*2*PI*t)'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv420p'.
Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '3'.
Reading option 'out.m4v' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument 9.
Applying option filter_complex (create a complex filtergraph) with argument testsrc=n=2;aevalsrc=sin(440*2*PI*t).
Successfully parsed a group of options.
Parsing a group of options: output file out.m4v.
Applying option pix_fmt (set pixel format) with argument yuv420p.
Applying option t (record or transcode "duration" seconds of audio/video) with argument 3.
Successfully parsed a group of options.
Opening an output file: out.m4v.
detected 4 logical cores
[Parsed_testsrc_0 @ 0x103100000] Setting 'n' to value '2'
[Parsed_testsrc_0 @ 0x103100000] size:320x240 rate:25/1 duration:-1.000000 sar:1/1
[Parsed_aevalsrc_1 @ 0x1031003e0] compat: called with args=[sin(440*2*PI*t)]
[Parsed_aevalsrc_1 @ 0x1031003e0] Setting 'exprs' to value 'sin(440*2*PI*t)'
[format @ 0x1031012c0] compat: called with args=[yuv420p]
[format @ 0x1031012c0] Setting 'pix_fmts' to value 'yuv420p'
[audio format for output stream 0:1 @ 0x103101ec0] Setting 'sample_fmts' to value 's16'
[audio format for output stream 0:1 @ 0x103101ec0] Setting 'channel_layouts' to value '0x4|0x3|0x7|0x107|0x37|0x3f'
Successfully opened the file.
[auto-inserted scaler 0 @ 0x103102880] w:iw h:ih flags:'bilinear' interl:0
[format @ 0x1031012c0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_testsrc_0' and the filter 'format'
[audio format for output stream 0:1 @ 0x103101ec0] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_aevalsrc_1' and the filter 'audio format for output stream 0:1'
[AVFilterGraph @ 0x1024217e0] query_formats: 6 queried, 8 merged, 4 already done, 0 delayed
[auto-inserted scaler 0 @ 0x103102880] w:320 h:240 fmt:rgb24 sar:1/1 -> w:320 h:240 fmt:yuv420p sar:1/1 flags:0x2
[Parsed_aevalsrc_1 @ 0x1031003e0] sample_rate:44100 chlayout:mono duration:-1.000000
[auto-inserted resampler 0 @ 0x103102f00] [SWR @ 0x10380b000] Using double precision mode
[auto-inserted resampler 0 @ 0x103102f00] ch:1 chl:mono fmt:dblp r:44100Hz -> ch:1 chl:mono fmt:s16 r:44100Hz
[libx264 @ 0x103800600] using mv_range_thread = 24
[libx264 @ 0x103800600] using SAR=1/1
[libx264 @ 0x103800600] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x103800600] profile High, level 1.3
[libx264 @ 0x103800600] 264 - core 129 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, ipod, to 'out.m4v':
  Metadata:
    encoder         : Lavf55.9.100
    Stream #0:0, 0, 1/12800: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 1/25, q=-1--1, 12800 tbn, 25 tbc
    Stream #0:1, 0, 1/44100: Audio: aac (libfaac) (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s
Stream mapping:
  testsrc -> Stream #0:0 (libx264)
  aevalsrc -> Stream #0:1 (libfaac)
Press [q] to stop, [?] for help
[libx264 @ 0x103800600] frame=   0 QP=22.89 NAL=3 Slice:I Poc:0   I:300  P:0    SKIP:0    size=3173 bytes
[libx264 @ 0x103800600] frame=   1 QP=19.64 NAL=2 Slice:P Poc:4   I:12   P:53   SKIP:235  size=488 bytes
[libx264 @ 0x103800600] frame=   2 QP=23.99 NAL=0 Slice:B Poc:2   I:3    P:18   SKIP:279  size=130 bytes
[libx264 @ 0x103800600] frame=   3 QP=20.04 NAL=2 Slice:P Poc:10  I:20   P:45   SKIP:235  size=571 bytes
[libx264 @ 0x103800600] frame=   4 QP=23.77 NAL=2 Slice:B Poc:8   I:6    P:18   SKIP:274  size=188 bytes
[libx264 @ 0x103800600] frame=   5 QP=24.48 NAL=0 Slice:B Poc:6   I:4    P:18   SKIP:277  size=87 bytes
[libx264 @ 0x103800600] frame=   6 QP=16.80 NAL=2 Slice:P Poc:18  I:13   P:48   SKIP:239  size=491 bytes
[libx264 @ 0x103800600] frame=   7 QP=14.07 NAL=2 Slice:B Poc:14  I:2    P:19   SKIP:279  size=72 bytes
[libx264 @ 0x103800600] frame=   8 QP=24.07 NAL=0 Slice:B Poc:12  I:4    P:15   SKIP:281  size=91 bytes
[libx264 @ 0x103800600] frame=   9 QP=24.48 NAL=0 Slice:B Poc:16  I:0    P:14   SKIP:285  size=60 bytes
[libx264 @ 0x103800600] frame=  10 QP=19.62 NAL=2 Slice:P Poc:26  I:13   P:49   SKIP:238  size=565 bytes
[libx264 @ 0x103800600] frame=  11 QP=22.93 NAL=2 Slice:B Poc:22  I:3    P:30   SKIP:267  size=182 bytes
[libx264 @ 0x103800600] frame=  12 QP=13.00 NAL=0 Slice:B Poc:20  I:1    P:29   SKIP:270  size=56 bytes
[libx264 @ 0x103800600] frame=  13 QP=15.21 NAL=0 Slice:B Poc:24  I:3    P:29   SKIP:268  size=62 bytes
[libx264 @ 0x103800600] frame=  14 QP=18.10 NAL=2 Slice:P Poc:34  I:10   P:48   SKIP:242  size=505 bytes
[libx264 @ 0x103800600] frame=  15 QP=21.88 NAL=2 Slice:B Poc:30  I:2    P:17   SKIP:279  size=92 bytes
[libx264 @ 0x103800600] frame=  16 QP=13.00 NAL=0 Slice:B Poc:28  I:1    P:12   SKIP:286  size=41 bytes
[libx264 @ 0x103800600] frame=  17 QP=25.61 NAL=0 Slice:B Poc:32  I:4    P:12   SKIP:284  size=83 bytes
[libx264 @ 0x103800600] frame=  18 QP=21.49 NAL=2 Slice:P Poc:42  I:15   P:48   SKIP:237  size=534 bytes
[libx264 @ 0x103800600] frame=  19 QP=19.63 NAL=2 Slice:B Poc:38  I:3    P:31   SKIP:265  size=138 bytes
[libx264 @ 0x103800600] frame=  20 QP=24.82 NAL=0 Slice:B Poc:36  I:0    P:22   SKIP:277  size=77 bytes
[libx264 @ 0x103800600] frame=  21 QP=15.43 NAL=0 Slice:B Poc:40  I:2    P:25   SKIP:273  size=58 bytes
[libx264 @ 0x103800600] frame=  22 QP=20.04 NAL=2 Slice:P Poc:44  I:8    P:50   SKIP:242  size=234 bytes
[libx264 @ 0x103800600] frame=  23 QP=20.31 NAL=2 Slice:P Poc:50  I:19   P:51   SKIP:230  size=510 bytes
[libx264 @ 0x103800600] frame=  24 QP=22.51 NAL=2 Slice:B Poc:48  I:0    P:25   SKIP:275  size=89 bytes
No more output streams to write to, finishing.
[libx264 @ 0x103800600] frame=  25 QP=22.99 NAL=0 Slice:B Poc:46  I:1    P:19   SKIP:279  size=77 bytes
[libx264 @ 0x103800600] frame=  26 QP=13.24 NAL=2 Slice:P Poc:58  I:19   P:46   SKIP:235  size=485 bytes
[libx264 @ 0x103800600] frame=  27 QP=15.12 NAL=2 Slice:B Poc:54  I:3    P:31   SKIP:266  size=96 bytes
[libx264 @ 0x103800600] frame=  28 QP=24.94 NAL=0 Slice:B Poc:52  I:4    P:17   SKIP:279  size=99 bytes
[libx264 @ 0x103800600] frame=  29 QP=24.48 NAL=0 Slice:B Poc:56  I:1    P:21   SKIP:277  size=70 bytes
[libx264 @ 0x103800600] frame=  30 QP=19.97 NAL=2 Slice:P Poc:64  I:10   P:50   SKIP:240  size=417 bytes
[libx264 @ 0x103800600] frame=  31 QP=25.26 NAL=2 Slice:B Poc:62  I:3    P:27   SKIP:270  size=112 bytes
[libx264 @ 0x103800600] frame=  32 QP=22.18 NAL=0 Slice:B Poc:60  I:1    P:28   SKIP:270  size=85 bytes
[libx264 @ 0x103800600] frame=  33 QP=17.44 NAL=2 Slice:P Poc:72  I:17   P:57   SKIP:226  size=485 bytes
[libx264 @ 0x103800600] frame=  34 QP=20.03 NAL=2 Slice:B Poc:68  I:0    P:31   SKIP:268  size=94 bytes
[libx264 @ 0x103800600] frame=  35 QP=23.13 NAL=0 Slice:B Poc:66  I:2    P:18   SKIP:279  size=74 bytes
[libx264 @ 0x103800600] frame=  36 QP=13.00 NAL=0 Slice:B Poc:70  I:1    P:26   SKIP:273  size=49 bytes
[libx264 @ 0x103800600] frame=  37 QP=14.02 NAL=2 Slice:P Poc:74  I:7    P:52   SKIP:241  size=250 bytes
[libx264 @ 0x103800600] frame=  38 QP=19.29 NAL=2 Slice:P Poc:82  I:11   P:63   SKIP:226  size=512 bytes
[libx264 @ 0x103800600] frame=  39 QP=14.96 NAL=2 Slice:B Poc:78  I:1    P:33   SKIP:266  size=67 bytes
[libx264 @ 0x103800600] frame=  40 QP=23.34 NAL=0 Slice:B Poc:76  I:3    P:19   SKIP:277  size=70 bytes
[libx264 @ 0x103800600] frame=  41 QP=21.64 NAL=0 Slice:B Poc:80  I:2    P:19   SKIP:277  size=69 bytes
[libx264 @ 0x103800600] frame=  42 QP=13.28 NAL=2 Slice:P Poc:84  I:13   P:51   SKIP:236  size=247 bytes
[libx264 @ 0x103800600] frame=  43 QP=19.27 NAL=2 Slice:P Poc:92  I:7    P:50   SKIP:243  size=488 bytes
[libx264 @ 0x103800600] frame=  44 QP=18.37 NAL=2 Slice:B Poc:88  I:6    P:32   SKIP:261  size=119 bytes
[libx264 @ 0x103800600] frame=  45 QP=24.48 NAL=0 Slice:B Poc:86  I:3    P:21   SKIP:275  size=75 bytes
[libx264 @ 0x103800600] frame=  46 QP=15.29 NAL=0 Slice:B Poc:90  I:3    P:21   SKIP:276  size=54 bytes
[libx264 @ 0x103800600] frame=  47 QP=13.07 NAL=2 Slice:P Poc:94  I:9    P:56   SKIP:235  size=285 bytes
[libx264 @ 0x103800600] frame=  48 QP=19.36 NAL=2 Slice:P Poc:100 I:18   P:51   SKIP:231  size=611 bytes
[libx264 @ 0x103800600] frame=  49 QP=22.61 NAL=2 Slice:B Poc:98  I:2    P:21   SKIP:277  size=75 bytes
[libx264 @ 0x103800600] frame=  50 QP=24.48 NAL=0 Slice:B Poc:96  I:1    P:12   SKIP:286  size=61 bytes
[libx264 @ 0x103800600] frame=  51 QP=11.69 NAL=2 Slice:P Poc:108 I:23   P:49   SKIP:228  size=487 bytes
[libx264 @ 0x103800600] frame=  52 QP=16.12 NAL=2 Slice:B Poc:104 I:2    P:29   SKIP:269  size=83 bytes
[libx264 @ 0x103800600] frame=  53 QP=25.61 NAL=0 Slice:B Poc:102 I:5    P:14   SKIP:281  size=90 bytes
[libx264 @ 0x103800600] frame=  54 QP=24.18 NAL=0 Slice:B Poc:106 I:2    P:22   SKIP:275  size=79 bytes
[libx264 @ 0x103800600] frame=  55 QP=19.35 NAL=2 Slice:P Poc:114 I:13   P:53   SKIP:234  size=478 bytes
[libx264 @ 0x103800600] frame=  56 QP=25.68 NAL=2 Slice:B Poc:112 I:5    P:24   SKIP:271  size=107 bytes
[libx264 @ 0x103800600] frame=  57 QP=23.08 NAL=0 Slice:B Poc:110 I:1    P:30   SKIP:268  size=83 bytes
[libx264 @ 0x103800600] frame=  58 QP=17.59 NAL=2 Slice:P Poc:122 I:17   P:58   SKIP:225  size=484 bytes
[libx264 @ 0x103800600] frame=  59 QP=16.91 NAL=2 Slice:B Poc:118 I:1    P:34   SKIP:263  size=106 bytes
[libx264 @ 0x103800600] frame=  60 QP=24.48 NAL=0 Slice:B Poc:116 I:4    P:16   SKIP:279  size=71 bytes
[libx264 @ 0x103800600] frame=  61 QP=13.00 NAL=0 Slice:B Poc:120 I:2    P:27   SKIP:271  size=52 bytes
[libx264 @ 0x103800600] frame=  62 QP=13.54 NAL=2 Slice:P Poc:124 I:12   P:53   SKIP:235  size=268 bytes
[libx264 @ 0x103800600] frame=  63 QP=19.60 NAL=2 Slice:P Poc:132 I:11   P:57   SKIP:232  size=508 bytes
[libx264 @ 0x103800600] frame=  64 QP=14.67 NAL=2 Slice:B Poc:128 I:3    P:35   SKIP:262  size=73 bytes
[libx264 @ 0x103800600] frame=  65 QP=24.16 NAL=0 Slice:B Poc:126 I:1    P:27   SKIP:271  size=83 bytes
[libx264 @ 0x103800600] frame=  66 QP=23.56 NAL=0 Slice:B Poc:130 I:1    P:16   SKIP:281  size=57 bytes
[libx264 @ 0x103800600] frame=  67 QP=20.59 NAL=2 Slice:P Poc:140 I:18   P:55   SKIP:227  size=439 bytes
[libx264 @ 0x103800600] frame=  68 QP=22.61 NAL=2 Slice:B Poc:136 I:2    P:30   SKIP:266  size=135 bytes
[libx264 @ 0x103800600] frame=  69 QP=15.47 NAL=0 Slice:B Poc:134 I:1    P:25   SKIP:274  size=46 bytes
[libx264 @ 0x103800600] frame=  70 QP=16.38 NAL=0 Slice:B Poc:138 I:0    P:24   SKIP:275  size=63 bytes
[libx264 @ 0x103800600] frame=  71 QP=22.92 NAL=2 Slice:P Poc:148 I:6    P:52   SKIP:242  size=322 bytes
[libx264 @ 0x103800600] frame=  72 QP=16.07 NAL=2 Slice:B Poc:144 I:2    P:23   SKIP:275  size=74 bytes
[libx264 @ 0x103800600] frame=  73 QP=25.61 NAL=0 Slice:B Poc:142 I:3    P:20   SKIP:277  size=98 bytes
[libx264 @ 0x103800600] frame=  74 QP=23.58 NAL=0 Slice:B Poc:146 I:1    P:10   SKIP:288  size=58 bytes
frame=   75 fps=0.0 q=-1.0 Lsize=      44kB time=00:00:03.01 bitrate= 119.8kbits/s    
video:18kB audio:22kB subtitle:0 global headers:0kB muxing overhead 9.250036%
[libx264 @ 0x103800600] frame I:1     Avg QP:22.89  size:  3173
[libx264 @ 0x103800600] frame P:24    Avg QP:17.93  size:   444
[libx264 @ 0x103800600] frame B:50    Avg QP:20.73  size:    84
[libx264 @ 0x103800600] consecutive B-frames:  8.0%  2.7% 20.0% 69.3%
[libx264 @ 0x103800600] mb I  I16..4: 68.0%  6.7% 25.3%
[libx264 @ 0x103800600] mb P  I16..4:  3.3%  0.5%  0.6%  P16..4: 10.3%  4.5%  2.4%  0.0%  0.0%    skip:78.2%
[libx264 @ 0x103800600] mb B  I16..4:  0.7%  0.0%  0.0%  B16..8:  6.6%  0.7%  0.1%  direct: 0.3%  skip:91.5%  L0:47.6% L1:50.4% BI: 2.0%
[libx264 @ 0x103800600] 8x8 transform intra:8.5% inter:28.5%
[libx264 @ 0x103800600] coded y,uvDC,uvAC intra: 10.0% 31.1% 18.3% inter: 1.1% 2.9% 1.8%
[libx264 @ 0x103800600] i16 v,h,dc,p: 66% 18%  6% 10%
[libx264 @ 0x103800600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 73%  2% 24%  0%  0%  0%  0%  0%  0%
[libx264 @ 0x103800600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 50% 28% 16%  1%  1%  1%  0%  1%  0%
[libx264 @ 0x103800600] i8c dc,h,v,p: 32% 20% 39%  8%
[libx264 @ 0x103800600] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x103800600] ref P L0: 63.5%  5.7% 25.2%  5.6%
[libx264 @ 0x103800600] ref B L0: 74.2% 16.5%  9.3%
[libx264 @ 0x103800600] ref B L1: 94.2%  5.8%
[libx264 @ 0x103800600] kb/s:48.13
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x103102520] Statistics: 60 seeks, 252 writeouts

Using either libfaac (as above) or the native aac encoder (add -c:a aac -strict experimental), the edit lists written to out.m4v are:

video track edit list (2 entries):

[0] duration=80 (0.08s) media_time=-1 (empty edit)
[1] duration=3000 (3s) media_time=1024 (0.08s)

audio track edit list (2 entries):

[0] duration=56 (0.056s) media_time=-1 (empty edit)
[1] duration=3042 (3.066s) media_time=0 (0s)

As expected there are no empty edits if "out.m4v" is changed to "out.mp4" in the above command:

video track edit list (1 entry):

[0] duration=3000 (3s) media_time=1024 (0.08s)

audio track edit list (1 entry):

[0] duration=3018 (3.018s) media_time=1024 (0.023s)

Using the FDK AAC encoder (-c:a libfdk_aac) the values are a little different but the issue is the same.

ffplay does not correctly handle audio that does not start at time 0 (ticket:1721), and also starts playing immediately, so it is difficult to test with ffplay. If the output video is opened in Apple's QuickTime Player, an empty black frame appears before the Play button is pressed. Normally the first video frame is seen. An empty black box also appears under "Preview:" when you click on it in a Mac Finder window (columns mode). This works as expected with MP4 output, and with M4V output produced by ffmpeg 1.2.1.

The edit lists can be seen directly using various utilities, such as mp4file http://code.google.com/p/mp4v2/ : mp4file --dump --debug 2 out.m4v and search for elst in the output. There will be one edit list for the video track and another one for the audio track, with two entries each. An entry with mediaTime -1 / 4294967295 / 0xffffffff is an empty edit (no media).

ffmpeg version 1.1.git-bbe26ef (git master 2013-Jun-24)
Viewed with: QuickTime Player 10.0 (131) / Mac OS X 10.6.8

Change History (5)

comment:1 follow-up: Changed 4 years ago by MarkZV

It appears that the cause of the problem is that -avoid_negative_ts defaults to 0 for MP4, and 1 for M4V. The reason for that is unknown. It seems that this should be 0 for both, since the edit list already handles negative timestamps by mapping time 0 to a media time greater than 0.

comment:2 in reply to: ↑ 1 ; follow-up: Changed 4 years ago by michael

Replying to MarkZV:

It appears that the cause of the problem is that -avoid_negative_ts defaults to 0 for MP4, and 1 for M4V. The reason for that is unknown. It seems that this should be 0 for both, since the edit list already handles negative timestamps by mapping time 0 to a media time greater than 0.

Not an option, adobes flash player doesnt support edit lists last i checked. And it is a commonly used player so not supporting it isnt an option either

comment:3 Changed 4 years ago by cehoyos

  • Keywords mov added

comment:4 in reply to: ↑ 2 Changed 4 years ago by michael

  • Resolution set to fixed
  • Status changed from new to closed

Replying to michael:

Replying to MarkZV:

It appears that the cause of the problem is that -avoid_negative_ts defaults to 0 for MP4, and 1 for M4V. The reason for that is unknown. It seems that this should be 0 for both, since the edit list already handles negative timestamps by mapping time 0 to a media time greater than 0.

Not an option, adobes flash player doesnt support edit lists last i checked. And it is a commonly used player so not supporting it isnt an option either

Rereading with my brain switched on, yes you are entirely correct, changed the default for the ipod muxer (adobe flash player shouldnt be a factor for ipod muxed files i hope)

Fixed in 65abce67b52c920d1f6f691a883ec787773916fd

comment:5 Changed 4 years ago by MarkZV

Thanks. I've verified that it is working with git master.

Any player that ignores edit lists should be unaffected, since -avoid_negative_ts only affects the edit lists.

Note: See TracTickets for help on using tickets.