Why does digicam's max video rec time differ?
When I take a video with my Canon PS G9 it will automatically stop recording
anywhere from 20 minutes to 1 hour. Why such a variance? Battery is not the issue: I can start another video and likewise it will record for a similar time. The manual says that 4 GB is the max video file size it will record (indeed, the files are all 4 GB), but that the max time will vary. The manual says: "Even if the clip size has not reached 4 GB, recording will stop at the moment the clip length reaches 1 hour. Depending on memory card capacity and data write speed, recording may stop before the file size reaches 4 GB or the recording time reaches 1 hour." My question is: what variables cause the max time to vary? If I'm using the same memory card (SDHC, Samsung 32 GB, class 10), why not identical video times? (These tests are done with identical settings: when a video has stopped recording I just push the shutter button again.) Thanks. |
Why does digicam's max video rec time differ?
On 10/08/2012 17:45, DaveC wrote:
When I take a video with my Canon PS G9 it will automatically stop recording anywhere from 20 minutes to 1 hour. Why such a variance? It depends strongly on the compressibility of the material in the MPEG stream (or whatever method that camera used). An active scene with people moving panning and/or zoom will require a lot more storage space that a picture of a still life arrangement of fruit on a table. Battery is not the issue: I can start another video and likewise it will record for a similar time. The manual says that 4 GB is the max video file size it will record (indeed, the files are all 4 GB), but that the max time will vary. The manual says: "Even if the clip size has not reached 4 GB, recording will stop at the moment the clip length reaches 1 hour. Depending on memory card capacity and data write speed, recording may stop before the file size reaches 4 GB or the recording time reaches 1 hour." The 4GB is a hardware limitation of the file system typically used on removable media. Even proper video cameras often split long files every 4GB to deal with this limitation. The 1 hour timeout is artificial and imposed by the manufacturer fairly gratuitously. I have to say that my Inxus 100IS burns through its battery when taking video and becomes quite hot after about 5 minutes. My question is: what variables cause the max time to vary? If I'm using the same memory card (SDHC, Samsung 32 GB, class 10), why not identical video times? (These tests are done with identical settings: when a video has stopped recording I just push the shutter button again.) Thanks. If you film a static scene with MPEG encoding it will be rather easily compressible. Regards, Martin Brown |
Why does digicam's max video rec time differ?
On 11/08/2012 09:43, Martin Brown wrote:
[] The 4GB is a hardware limitation of the file system typically used on removable media. Even proper video cameras often split long files every 4GB to deal with this limitation. The 1 hour timeout is artificial and imposed by the manufacturer fairly gratuitously. [] Regards, Martin Brown IIRC, there is a 30-minute cut-off so that in Europe the camera cannot be regarded as a "video" camera, and therefore escapes some particular tax, but I might be wrong. -- Cheers, David Web: http://www.satsignal.eu |
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