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Video cannot be played on iPhone?

Discussion in 'iPhone Tips, Help and Troubleshooting' started by micrors4racer, Nov 27, 2012.

  1. macrumors 6502

    I remuxed a show from mkv using subler to turn it into an m4v with an ac3 track and aac 2 ch. track. It plays fineon my mac and through my network with my apple tv and iPhone using home sharing. How ever when I try to sync the video to my iPhone so I can watch it on the go it gives me an error saying "...were not copied to the iPhone because they cannot be played on this iPhone." I can get it to say something along the lines of the video being an unsupported format if I individually click the files on the error window. Why is it doing this? The files are obviously in the correct format because they play fine on the apple tv, mac, and even the iPhone I am trying to sync them to if I am using home sharing.

    Here are the video file stats. I have 2 seasons worth of this show remuxed and all of the episodes refuse to sync.

    Attached Files:

  2. macrumors 603

    I think the H.264 level of the files is over 4.1. (Which shouldn't be the case with standard 720p files as 720p shouldn't be over 4.1. Some for example cameras, however, are known for incorrectly setting it.)

    Videos with AAC + AC3 audio tracks and level 4.1 or less should sync just great with iOS - for example, the one at https://dl.dropbox.com/u/81986513/1...v-with-ac3-and-aac-startsWithKeyframe-l41.m4v (give it a try to check if it indeed synches to yours!). The same file with level 5.1, however, can't be synched - it's at https://dl.dropbox.com/u/81986513/1...s/m4v-with-ac3-and-aac-startsWithKeyframe.m4v

    Check the level with Subler or MediaInfo. I can even paste my H.264-level specific tutorials if you don't know what this all is about.
  3. macrumors 6502

    The files are level 4.1 according to subler does that sound correct?

    Attached Files:

  4. Menneisyys2, Nov 29, 2012
    Last edited: Nov 29, 2012

    macrumors 603

    1, it sounds normal. Did you try synching the file I've linked to, in order to see whether it's a generic problem with your iTunes?

    2, if it works, can you post your video online (say, Dropbox) so that I can try it too? If it's too big, just split it (via, say, QuickTime 7 Pro), and, making sure the splitted video can't be synched either, post the short chunk?

    EDIT: forget the above. The problem is that your AAC track isn't enabled - hence the unchecked AAC checkbox in Subler. This has no effect in VLC but it has in both iTunes when trying to play it back (it'll grey out the second audio track) and, particularly, when you try to synch the video to an iDevice.

    The solution: just enable the AAC checbox in Subler and save.
  5. macrumors 603

    Bumping the thread, should you already have read my previous answer.
  6. macrumors 6502

    It is greyed out in iTunes so you are on to something. But before I run everything through subler again; wouldn't enabling both tracks cause them to play at the same time? Should I check the subtitle track on my videos with subtitles or leave them unchecked?

    One last thing, could I just run the M4Vs through subler or do I have to start fro my MKVs again?
  7. macrumors 603

    You can enable all tracks - they won't overlap.
  8. macrumors 6502

    Thanks for the help! And should I remux all of them again from the MKVs using subler or should I just open the remuxed m4v's in subler and enable the tracks?
  9. macrumors 603

    Open the m4v file and just check the checkbox. Then, save. No need for remuxing.
  10. macrumors 6502

    Awesome everything works now! :D For the H.264 Video Profile level what should I set it to for maximum quality when viewing on an a 3rd Gen Apple TV. I noticed that subler automatically selects 4.1 or 3.1 sometimes and I am not sure what to put to.
  11. macrumors 603

    It doesn't alter the quality. You can leave it at its default value, assuming it's lower than 4.2. (That level is incompatible with iOS devices. I've published several articles on changing it. If your devices do play it, then, there's no point in altering it at all - only when they refuse to play it back.)
  12. macrumors 6502

    Do you have a link to these articles? I'd like to read them.
  13. macrumors 603

    I can't provide external links as linking to my blog would be self-promotion. Therefore, I paste all the articles in here, in order. The first will be in this post; the second in the following one. Note that, if you have a Mac, you'll want to jump to the second as Subler should be preferred to the Mac-specific section of the first article. (The second is a newer article than the first one. H.264 level change was added to Subler between the two articles. I didn't have the time to completely rewrite the Mac-specific section of the first article so that it recommends Subler over everything else.)

    Making the stock Videos application play every MP4 file possible

    I've dedicated several articles to converting videos into MP4 (M4V / MOV) files so that they can be played back by the H.264 decoder of even older-generation iDevices. In the current one, I elaborate on how how you can play the output files with the built-in, stock Videos application. This article also belong to my Multimedia article series, in which I plan to publish a “Streaming multimedia over your local Wi-Fi” in the next few days and, then, finally, the real Multimedia bible.

    If you don't want to use any third-party player on your iDevice to play these videos but want to strictly stick with the built-in Videos, you may have already run into the “XY was not copied because the video format is not supported by the iXZ "XY"” message like the following:


    The two videos shown here are both part of the well-known video test suite available HERE and linked from the first, “Video testing samples” chart: the “Suzumiya” and the “Planet” (MKV) videos. (Both have been converted into MP4 – by only changing the audio track's encoding and channel number – by avidemux as is explained in my article dedicated to avidemux. Note that, should you want to convert the videos from MKV to MP4 with the current (1.8.10 ) version of Playback, it'll refuse to convert “Planet” - and, for that matter, of the test suite, “Harry Potter” and , “Monsters” as well. I'll return to evaluating Playback, its UPnP and MKV -> MP4 conversion capabilities later, in my next article dedicated to streaming video on your Wi-Fi network.)

    The problem is caused by Apple's long-outdated (and buggy) approach to synchronizing videos to iDevices. While all current (and even past, old ones like the iPad 1!) iDevices are fully capable of playing back even the most demanding H.264 videos, for some reason (it might be a simple oversight?), Apple doesn't let these videos synchronized to the Videos app on the iDevice.

    This is caused by Apple's not allowing the synchronization of any videos above level 4.1. If you take a closer look at the chart I've linked to, you can see the “Enc opts” contains “high profile 5.1” for both videos. If, on the other hand, you try to (after converting them to MP4, of course) ones that contain “high profile 4.1” (or less) instead, they'll be happily synched to (and played back by) your iDevice; for example, “Harry Potter”, “Birds” and “Monsters”. The first of them uses “high profile 3.1”, the second two 4.1. Incidentally, “Birds”, which is also played back by even the A4-based iPhone 4, iPod touch 4 and iPad 1 flawlessly, uses a very high encoding bitrate: 40 Mbps. It equals to the maximal allowed bitrate of “true” Blue-ray discs (see THIS). Actually, the chart even mentions (see column “Note”: “Direct bluray (or hddvd) remux”) that the MKV file has been created by directly(!) taking a small chunk of a video from a Blue-ray disc without any kind of recompression (and drastically lowering the birate).

    Note that, while the CPU/GPU would definitely be able to cope with it, you can only transfer 720p videos to your A4-based devices (iPhone 4, iPod touch 4 and the iPad 1). Even if you “downgrade” the video to high profile 3.1 or 4.1 (from 5.1), it won't be synced to these devices. With these devices, the only way to play back true 1080p content is using a third-party player (for example, GoodPlayer) able to utilize hardware video decoding. Also note that you can only sync 1080p to iPad 2's running iOS5+ but not previous, 4.x versions (dedicated article HERE)

    The solution

    The solution to the problem, apart from just purchasing an app (for example, GoodPlayer) that can directly play even high profile 5.1 H.264-based MP4 files using the hardware decoder, is modifying the video files in question. Fortunately, it's far easier than you might think: you do NOT need to recompress the video at all (taking even hours) but only need to change a single byte in the file.

    If you have a Mac, just download THIS file. It looks for the above-mentioned “magic byte” in the video file you pass it to and changes it to be of 3.1. (You can also supply 4.1 instead of the default 3.1 by changing the “f.write(chr(0x1F))” statement to “f.write(chr(0x29))”. There isn't much point in doing so, though.) Please check out mcneildeal's post at Oct 23, 2010 9:17 PM in THIS thread for more info on the usage on both the Mac and Windows. Just overwrite the file iTunes previously declined to sync to your iDevice in the Movies tab and try syncing again.

    Patching may be a bit time-consuming if the byte in question isn't at the end of the file (it's from there that the script starts seeking back from). Basically, if you use avidemux for the conversion into MP4, this will be the case. However, if you use the above-mentioned Playback for the conversion, it'll be at the beginning of the file, rendering the script very slow.


    Windows has a dedicated and also-free app for the quick file patching: H264 Level Editor by CoolSoft. It's available HERE.

    As opposed to the Python script I've spoken of in the previous section, it starts examining the file from the beginning. This means it parses videos repackaged by Playback reliably and, compared to the Python script, VERY fast – at least ones that haven't been re-processed by Subler to add subtitles. It couldn't handle avidemux-repackaged files well.

    Note that...

    Non-standard MP4 files won't display subtitles in the stock player. For example, ones with built-in graphical (non-textual) subtitles like VobSub or external, textual SRT / SSA / ASS / SUB subtitles – more on this and similar stuff in my forthcoming multimedia articles. That is, not every MP4's and/or all their features will be compatible with your iDevice. Standardized ones will be.


    And this is the second article, also explaining how Subler should be used. Again, Subler should be preferred to the Mac-specific scripts I've recommended in the previous article.

    Watching videos taken to the max: Roundup of MKV to MP4/M4V video converters

    MKV, because of its being both open and very flexible, is a highly popular video container format today; this is why iOS forums are full of discussions of using, playing it (see for example THIS, new thread). Unfortunately, as has already pointed out in several of my articles, it can't be played back on iDevices natively; that is, with hardware-assisted decoding.

    Software-only decoding in third-party video players is useless over 720p resolutions (for example, at 1080p), no matter what some people say. This is why, as has been explained in my previous article on MKV handling and playback, you either convert the container to the already iOS-compatible MP4 / M4V / MOV (these are interchangeable; from now, I refer to them as “m4v” for simplicity) or jailbreak and use players (currently, XBMC or RushPlayer+) that, not being constrained by Apple's very strict (and, in this case (too), absolutely unnecessary) restrictions, can utilize the hardware decoder to correctly decode the video. Using third-party players on non-jailbroken devices, currently, is not really the way to go: even, for MKV playback, the most properly optimized player, EC Player, exhibits really nasty artefacts (video freezes for about 0.5 second every about 11 sec).

    There's (still) no jailbreak for the iPad 3 (or in case you won't want to use it it's released), so, we're stuck with, currently, the only viable way of playing back MKV's: converting (from now on, I use the official term “remuxing” to denote it's basically only the container that is changed, but in no way the video stream itself) them to M4V's first. Fortunately, it's way easier and faster than many would think.

    Let's start with the easiest, free approach that can handle most of the input videos.

    1. Subler

    I've discussed the (Mac OS X-only) Subler in several of my articles. In them, for the compatibility problems I'll soon describe, I've only discussed its excellent subtitle addition capabilities. However, in a full MKV -> M4V roundup, it should be discussed too.

    First, it's also a first-class MKV -> M4V converter if you know its limitations and how it compares to the other remuxer tools.

    1.1 First the advantages:

    - just like avidemux, it does convert both AC3 and DTS soundtracks (both 5.1 ones) to the both iTunes- (which doesn't play AC3 tracks) and iOS-friendly (stereo) AAC format, and unlike several even commercial tools like the MKV remuxer in Playback or the desktop converter of Sub Video Player.

    - it lets for changing the H.264 level of the videos to a value already accepted by iTunes, should you want to play it back in the stock Videos app delivered on your iDevice, as opposed to a third-party player. It's not only able to do this during the MKV > M4V remuxing, but with already-existing M4V files as well!

    - it even has a command-line interface, making it possible to do batch conversations. An example: you let it remux an entire directory of MKV files in the morning, and, some hours later, it's finished. No need to open / save each MKV manually!

    1.2 The disadvantage

    In my tests, Subler refused to open some (not many), huge (slightly over 20 Gbytes) 1080p MKV videos (23.976 fps/16 Mbps/ 1920x1078/x264/2pass/L4.1). I had no such problems with avidemux at all: it happily opened the file and converted it to M4V, also converting the originally AC3 5.1 audio track to AAC. (Of course, then, I still needed to add the subtitle track(s) manually – a completely unnecessary step with a conversion entirely done by Subler.)

    1.3 Usage

    First, you will need to check the "Convert AC-3 audio to AAC" box in Preferences > Audio if you want (originally) AC3 soundtracks to be played by, among other things, iTunes on the desktop:

    (If you forget to force the app to convert AC3 to AAC audio, it'll leave AC3 track(s) in the target M4V file, rendering the given track (or the entire video) unplayable. While some users have recommended (see e.g. evoshr...@gmail.com's comment on Jul 22, 2011 HERE), this default setting (always force AAC transcoding) still hasn't made its way to Subler.)

    In addition to this, the most important setting you'll need to pay attention to is the first (but not the second!) 64-bit checkbox, 64 bits chunk offset, upon saving. (This dialog isn't shown when you just edit (subtitle addition, H.264 level change etc.) an already-m4v source file.) If you leave it unchecked, remuxed files over 4Gbyte will be unreadable by any players. (If you remux smaller files, you don't need to check this checkbox.)

    (the checkbox is annotated by a red rectangle. Note that the "File Format" drop-down list can safely stay unaltered. I couldn't find any difference between the default setting ("Video-MPEG4") and the other video-specific ("Movie-MPEG4"): videos created with both settings could be read and edited by Quicktime 7, played back by VLC, iTunes and the Videos player on the iPad. Both could also be synchronized in the traditional iTunes way (making sure, of course, that the H.264 level doesn't exceed 4.1 (see below!))

    Otherwise, converting MKV's to M4V's is very straightforward. You open the MKV file (File / Open), click “Add” (after, possibly, de-selecting for example the unnecessary subtitle or audio tracks you won't need – you can't do the latter with subtitles!).

    After this, it's worth clicking the video track in the upper list if you want to play the video back in the stock Videos app on your iDevice and not in a third-party one. (iTunes refuses synchronizing anything over level 4.1.) If you see anything larger than 4.1 (4.2, 5.1 etc.) in the bottommost “H.264 Video Profile / Level” drop-down list, feel free to set it to 3.1 or 4.1 to enable synchronization:

    (Make sure you select the video stream and nothing else for the drop-down list (annotated by a red rectangle above) to become visible AND editable! It'll be the uppermost item, as you can also see in the above screenshot.)

    Again, this can be done to already-existing M4V files which have too large a level to be successfully synchronized by iTunes to your iDevice. Actually, using Subler to “patch” an existing “over-leveled” m4v file is much-MUCH faster and more reliable than the traditional, old ways explained in my previous article.

    Note that, if in the file list it doesn't display a meaningful name in the second column, feel free to provide one to avoid not seeing any name in runtime.

    1.4 All in all,

    Subler's MKV conversion capabilities are fantastic. It provides a basically some-clicks only approach to convert entire MKV's with all(!) the sound- and subtitle tracks in them. With the previous, avidemux-based conversion, if you did need the subtitles, you had to spend a lot more time on the subtitle extraction from the MKV source (iMkvExtract) and adding to the M4V target (with Subler). In addition, it's REALLY fast. And free!

    You just need to be aware of its very few shortcomings (the inability to open some MKV's) to know when to switch back to avidemux (and, if you also need to include subtitles in the m4v file, iMkvExtract and Subler).

    2. Yazsoft Playback

    Playback is a commercial (albeit not very pricey) UPnP server with built-in MKV -> M4V remuxing capabilities.

    I've thoroughly tested it and compared to its compatibility to the avidemux-based approach. Unfortunately, while Playback excels in simple batch conversions (you just add all the MKV files you want to convert and, then, start the remuxing), it in no way transfers subtitles to the target files and its compatibility rate is clearly worse than that of avidemux – for example, of the traditional MKV test suite, it couldn't convert Harry Potter, Monsters and Planet (unlike avidemux). In addition, it's slightly (about 5%) slower.

    All in all, I do NOT recommend it.

    3. Sub Video Player

    Sub Video Player is a (comparatively) expensive ($5), long-abandoned iPad video player. (Actually, when I contacted them – several times as a customer having paid full price for their app – last Summer, I haven't received ANY answer. The player hasn't received any updates since Autumn 2010 either.) It has a desktop component, which itself is a (disguised) MKV > M4V remuxer. It remuxes into two files: one for the audio+video combined (this is a plain M4V file and, therefore, can be directly rendered by the hardware decoder) and the other is a subtitle file.

    I in no way recommend this player. It just doesn't handle even the most basic conversion needs; for example, DTS audio tracks (a HUGE omission!). In addition, its advertised ASS (the most advanced, animated, Karaoke-capable subtitle format) subtitle compatibility is REALLY bad. For example, the subtitle severely lagged while playing back the traditional, with the app's own desktop converter converted ASS tester video Suzumiya. Again: don't even think of paying a single penny for this useless app!

    4. GOTSent (also see THIS)

    This title has no Mac version. Under Parallels 5.0 running on my Mac, after having extracted the h.264 and audio track and having converted the latter to stereo AAC (all this taking about three(!) times more than avidemux' doing the same: 55 minutes for a 20 Gbyte MKV), the actual MP4 muxing crashed at once. No subtitle files have been extracted before this, it seems.

    For me, it just didn't work and, preferring OS X to Windows, I couldn't bother more. Hope you have more luck. Nevertheless, you only should bother if you don't have a Mac with all its goodies (Subler being the most important).

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