aalkaabi Posted August 15, 2015 Share #1 Posted August 15, 2015 Advertisement (gone after registration) hi I've noticed that videos from the Q has hiccups when played back. Somebody here has encountered this issue? thanks. Link to post Share on other sites More sharing options...
Advertisement Posted August 15, 2015 Posted August 15, 2015 Hi aalkaabi, Take a look here Video hiccups. I'm sure you'll find what you were looking for!
jaapv Posted August 16, 2015 Share #2 Posted August 16, 2015 Yes- though not with the Q specifically. It has to do with the codec when writing to DVD, as far as I am aware. Link to post Share on other sites More sharing options...
barjohn Posted August 16, 2015 Share #3 Posted August 16, 2015 Is he discussing playback from SD card on computer or after writing to DVD? Link to post Share on other sites More sharing options...
CheshireCat Posted August 16, 2015 Share #4 Posted August 16, 2015 I've noticed that videos from the Q has hiccups when played back. Describe "hiccups", and let us know what are you using to play back the clips. Link to post Share on other sites More sharing options...
aalkaabi Posted August 16, 2015 Author Share #5 Posted August 16, 2015 The video will freeze every few seconds(not really freeze but video frames will be the same, if you know what i mean). And i use my mac to play it back. Guys, i shoot video with my other cameras with no such issues. And no i don't use dvd, such an old format Link to post Share on other sites More sharing options...
jaapv Posted August 16, 2015 Share #6 Posted August 16, 2015 Using a slow SD card perhaps? Just checking. Link to post Share on other sites More sharing options...
aalkaabi Posted August 16, 2015 Author Share #7 Posted August 16, 2015 Advertisement (gone after registration) 90Mb/s should handle well ! Link to post Share on other sites More sharing options...
CheshireCat Posted August 16, 2015 Share #8 Posted August 16, 2015 90Mb/s should handle well ! Agreed. And if the same video frame is replicated multiple times, then it means the problem happens before the video compression stage, hence before writing to SD. I don't own a Q, so I can only guess... Some other cameras will do the "hiccup" thing if you take a still picture while recording video. Also, can you disable AF and see if you still have hiccups ? Link to post Share on other sites More sharing options...
digitalfx Posted August 16, 2015 Share #9 Posted August 16, 2015 My guess is the issue is with OP's computer, playback of 1080 requires enough resources. I don't have any issues with the few video clips I have recorded. Link to post Share on other sites More sharing options...
CheshireCat Posted August 16, 2015 Share #10 Posted August 16, 2015 My guess is the issue is with OP's computer, playback of 1080 requires enough resources. I don't have any issues with the few video clips I have recorded. The OP said the recorded video contains the same frame repeated multiple times. If so, the problem is during recording, not playback. Link to post Share on other sites More sharing options...
Sandokan Posted August 16, 2015 Share #11 Posted August 16, 2015 Does the OP first copy the files to the Mac hard disc or is he playing back from the SD card? Link to post Share on other sites More sharing options...
elephant Posted August 16, 2015 Share #12 Posted August 16, 2015 The video will freeze every few seconds(not really freeze but video frames will be the same, if you know what i mean). And i use my mac to play it back. Guys, i shoot video with my other cameras with no such issues. And no i don't use dvd, such an old format What's the format of the other clips you took with other cameras? Is it the same as the Q's? What playback app are you using? Is the recorded video composed of high-motion content? I'm asking these because your system and/or playback software may not have sufficient memory to buffer those 1080p60 sized frames. You may want to increase your system's page size and configure your playback software accordingly. Link to post Share on other sites More sharing options...
elephant Posted August 16, 2015 Share #13 Posted August 16, 2015 The OP said the recorded video contains the same frame repeated multiple times. If so, the problem is during recording, not playback. It's not necessarily true that the problem is in the recording. If the OP's system does not have sufficient memory to buffer those large 1080p60 frames the playback SW will just repeat the previously displayed frames until memory is freed. Link to post Share on other sites More sharing options...
CheshireCat Posted August 16, 2015 Share #14 Posted August 16, 2015 It's not necessarily true that the problem is in the recording. Well, I assume he has verified that the video actually contains multiple identical frames. OP to confirm. Also, a link to one of these video files would help. If the OP's system does not have sufficient memory to buffer those large 1080p60 frames the playback SW will just repeat the previously displayed frames until memory is freed. Actually, it is never a memory problem but a decoding speed problem. The default player in Mac OS X is crap, and a good player like VLC (www.videolan.org) is strongly recommended. Link to post Share on other sites More sharing options...
aalkaabi Posted August 16, 2015 Author Share #15 Posted August 16, 2015 My system is powerful, i can play 4k with no issues. It's something within the camera, yes i confirm identical frames were recorded. also i was trying to take still while shooting video, but then so what, the camera is allowing this. Link to post Share on other sites More sharing options...
aalkaabi Posted August 16, 2015 Author Share #16 Posted August 16, 2015 I will test it further Link to post Share on other sites More sharing options...
elephant Posted August 16, 2015 Share #17 Posted August 16, 2015 Well, I assume he has verified that the video actually contains multiple identical frames. OP to confirm. Also, a link to one of these video files would help. Actually, it is never a memory problem but a decoding speed problem. The default player in Mac OS X is crap, and a good player like VLC (www.videolan.org) is strongly recommended. You can't simply discount memory issues since you need to store those decoded frames somewhere. If memory is insufficient, the playback SW will have to wait for memory to be freed before placing the decoded frame into memory; otherwise, the decode and presentation pipeline is stalled - hence the "hiccup" visual artifact. Modern processors should have no problem with decoding. If you say speed in decoding is the issue, this problem is alleviated by having sufficient buffers prior to presenting the frames such that there are no noticeable glitches in presentation. Besides all decoders have to follow a decoding model (see MPEG2 spec) that specifies a decode and presentation time to be compliant. However, since the OP's machine is powerful enough the above may not be the OP's problem. Link to post Share on other sites More sharing options...
elephant Posted August 16, 2015 Share #18 Posted August 16, 2015 I will test it further Perhaps test without taking a still and record a high motion content video to avoid repeated frames. If you can't find a case for the latter, try looking for a very high detailed background (maybe a very clutterred room), and do a panning motion from left-to-right while recording. And as suggested try to use the VLC player. It's free. Link to post Share on other sites More sharing options...
CheshireCat Posted August 16, 2015 Share #19 Posted August 16, 2015 You can't simply discount memory issues since you need to store those decoded frames somewhere. If memory is insufficient, the playback SW [...]. Yes, I can simply discount memory issues. Excuse me while I enter nerd mode... A 1080p frame is 1920*1088 pixels. The decoder usually needs to store 2 or 3 frames (depending on compression mode) in YUV 4:2:0 format which in the worst case is about 10 MB of memory footprint. 10 MB (MegaBytes) of memory are not a problem even for the crappiest smartphone. Hope this explains why the only problem is the speed, not the amount of memory. Besides all decoders have to follow a decoding model (see MPEG2 spec) that specifies a decode and presentation time to be compliant. It is actually MPEG4 AVC, also known as H.264. A much better codec than the ancient MPEG2, which in turn is a much better codec than the prehistoric MJPEG used on the M240. In any case, this smells like a RTFM problem: if you take stills while capturing video, then the described "freeze" may happen. Link to post Share on other sites More sharing options...
digitalfx Posted August 17, 2015 Share #20 Posted August 17, 2015 My system is powerful, i can play 4k with no issues. It's something within the camera, yes i confirm identical frames were recorded. also i was trying to take still while shooting video, but then so what, the camera is allowing this. The camera allows this but it interrupts the recording as it does on any camera that allows simultaneous video and still recordings. Read the manual Link to post Share on other sites More sharing options...
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