Re-coding mp4/aac5.1 for iPod Touch produces weird result :(

[CDPlayer]

Hello,

Just tried to re-encode an existing mp4 file (x264 video, AAC 5.1) with the iPod Touch/iPhone preset. The resulting file is, mildly put, weird. Instead of original length of 1 hour 38 minutes it is three times as long. It has video in the first 1:38, then video track goes blank but audio carries on. The audio itself is strange - it appears as only some (which - I don't know) of the original 6 channels got reecoded, i.e. no dialogs are heard, but sound effects are. I did search for the terms I could come up with thinking of, but don't seem to be able to find it. Here is my encode log:

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HandBrake Activity Log for /Volumes/Big Disk/Users/alex/Desktop/WALL-E.mp4: 2009-12-12 15:49:32 +1100
Handbrake Version: 0.9.4 i386 (2009112300)

[15:49:32] macgui: Rip: Pending queue count is 0
[15:49:32] macgui: scanning specifically for title: 1
[15:49:32] macgui: performNewQueueScan currentQueueEncodeIndex is: 1
[15:49:32] hb_scan: path=/Volumes/Storage/Movies/English/Cartoons/WALL-E.mp4, title_index=1
[15:49:32] scan: trying to open with libdvdread
libdvdnav: Using dvdnav version 4.1.3
libdvdread: Using libdvdcss version 1.2.10 for DVD access
libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: failed to read VIDEO_TS.IFO
[15:49:32] dvd: not a dvd - trying as a stream/file instead
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Volumes/Storage/Movies/English/Cartoons/WALL-E.mp4':
  Duration: 01:38:42.06, start: 0.000000, bitrate: 2193 kb/s
    Stream #0.0(und): Video: h264, yuv420p, 1280x544 [PAR 1:1 DAR 40:17], 23.98 tbr, 23.98 tbn, 47.95 tbc
    Stream #0.1(und): Audio: aac, 48000 Hz, 5.1, s16
[15:49:33] scan: decoding previews for title 1
[15:49:33] scan: 10 previews, 1280x544, 23.976 fps, autocrop = 0/0/0/0, aspect 2.35:1, PAR 1:1
[15:49:33] scan: title (0) job->width:1280, job->height:544
[15:49:33] libhb: scan thread found 1 valid title(s)
[15:49:33] macgui: ScanDone state received from fQueueEncodeLibhb
[15:49:33] macgui: Preset: iPhone & iPod Touch
[15:49:33] macgui: processNewQueueEncode number of passes expected is: 1
[15:49:33] macgui: prepareJob exiting
[15:49:33] 1 job(s) to process
[15:49:33] starting job
[15:49:33] job configuration:
[15:49:33]  * source
[15:49:33]    + /Volumes/Storage/Movies/English/Cartoons/WALL-E.mp4
[15:49:33]    + title 1, chapter(s) 1 to 1
[15:49:33]    + container: mov,mp4,m4a,3gp,3g2,mj2
[15:49:33]    + data rate: 2193 kbps
[15:49:33]  * destination
[15:49:33]    + /Volumes/Big Disk/Users/alex/Desktop/WALL-E.mp4
[15:49:33]    + container: MPEG-4 (.mp4 and .m4v)
[15:49:33]  * video track
[15:49:33]    + decoder: h264
[15:49:33]    + frame rate: same as source (around 23.976 fps)
[15:49:33]    + dimensions: 1280 * 544 -> 496 * 208, crop 0/0/0/0
[15:49:33]    + encoder: x264
[15:49:33]      + options: cabac=0:ref=2:me=umh:bframes=0:subq=6:8x8dct=0:trellis=0
[15:49:33]      + quality: 20.00 (RF)
[15:49:33]  * audio track 0
[15:49:33]    + decoder: Unknown (AAC) (track 1, id 1)
[15:49:33]    + mixdown: Stereo
[15:49:33]    + encoder: ca_aac
[15:49:33]      + bitrate: 128 kbps, samplerate: 48000 Hz
libdvdnav: Using dvdnav version 4.1.3
libdvdread: Using libdvdcss version 1.2.10 for DVD access
libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: failed to read VIDEO_TS.IFO
[15:49:33] dvd: not a dvd - trying as a stream/file instead
[15:49:33] encx264: keyint-min: 24, keyint-max: 240
[15:49:33] encx264: Encoding at constant RF 20.000000
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
x264 [info]: profile Baseline, level 2.1
[15:49:33] sync: expecting 142011 video frames
[15:49:33] reader: first SCR 7507 id 0 DTS 0
[15:49:33] sync: first pts is 7507
[16:10:05] reader: done. 1 scr changes
[16:10:06] sync: got 141983 frames, 142011 expected
[16:10:06] work: average encoding speed for job is 115.114517 fps
[16:10:10] mux: track 0, 141983 frames, 458148227 bytes, 206.30 kbps, fifo 64
[16:10:10] mux: track 1, 832788 frames, 299641395 bytes, 134.93 kbps, fifo 1048576
[16:10:10] h264-decoder done: 141984 frames, 0 decoder errors, 0 drops
[16:10:10] render: lost time: 0 (0 frames)
[16:10:10] render: gained time: 0 (0 frames) (0 not accounted for)
x264 [info]: frame I:1545  Avg QP:17.42  size: 16541  PSNR Mean Y:46.67 U:49.72 V:49.82 Avg:47.41 Global:46.36
x264 [info]: frame P:140438 Avg QP:21.75  size:  3081  PSNR Mean Y:43.00 U:47.11 V:47.21 Avg:43.87 Global:42.71
x264 [info]: mb I  I16..4: 17.9%  0.0% 82.1%
x264 [info]: mb P  I16..4:  1.7%  0.0%  2.7%  P16..4: 39.1% 18.3%  7.8%  0.0%  0.0%    skip:30.5%
x264 [info]: coded y,uvDC,uvAC intra: 60.9% 73.3% 47.4% inter: 23.7% 20.4% 5.5%
x264 [info]: i16 v,h,dc,p: 32% 28% 12% 27%
x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 26% 16%  6%  7%  7%  8%  6%  7%
x264 [info]: ref P L0: 76.0% 24.0%
x264 [info]: SSIM Mean Y:0.9866537
x264 [info]: PSNR Mean Y:43.039 U:47.143 V:47.236 Avg:43.912 Global:42.739 kb/s:619.00
[16:10:10] aac-decoder done: 0 frames, 0 decoder errors, 0 drops
[16:10:10] libhb: work result = 0

[BradleyS]

I've been trying to narrow this down a bit. The audio in your source is read by ffmpeg like this:

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Stream #0.1(und): Audio: aac, 48000 Hz, 5.1, s16

However, in my testing, what HandBrake produces when selecting 6-channel discrete AAC output from AC3 input is read back by ffmpeg like this:

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Stream #0.1(eng): Audio: aac, 48000 Hz, 6 channels, s16, 422 kb/s

So as you can see, I am unable to reproduce the exact conditions under which the error occurs. I take it that your source was not originally encoded with HandBrake. What was it encoded with?

[BradleyS]

I should mention, the language being "und" or "eng" is probably not the issue. Rather, I'm calling attention to the lack of a bitrate listed in the former example, as well as "5.1" being used rather than "6 channels".

[CDPlayer]

Bradley,

Thanks for follow-up.

I understand about the difference.

As mentioned before on IRC, I will cut off a couple megabytes of the beginning of the original file and upload it somewhere for you. I believe that the original file was not made with HandBrake. I am not sure how it was made, but it is said to be compatible with Xbox360/PS3, and plays in Quicktime X just fine.

Stay tuned.

[BradleyS]

Since my last I have been able to reproduce the issue along with another HB contributor. We're working on the issue.

[CDPlayer]

Got it, no problem. Please let me know if I can help and I gladly will.

[Deleted User 11865]

Forum rule 3: Avoid discussing topics of dubious legality (DRM, warez, cracks, illegally obtained copyrighted content, or rental discs)

If you had obtained the source legally, you'd know how it was made. Locking.