Talk:MJPEG

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Is anyone else confused by these statements?

"The resulting quality of intraframe video compression is independent from the motion in the image which differs from MPEG video where quality often decreases when footage contains lots of movement."

"Prior to the recent rise in MPEG-4 encoding in consumer devices, a progressive scan form of MJPEG also saw widespread use in e.g. the "movie" modes of Digital Still Cameras, allowing video encoding and playback through the integrated JPEG compression hardware with only a software modification. Again, the resultant quality is markedly reduced compared to MPEG compression at a similar bitrate, particularly as sound (when included) was often uncompressed PCM or low-compression (and low processor-demand) ADPCM."

I read the first one to say that MJPEG can offer better quality than MPEG, particularly when there's a lot of motion. The second statement seems to contradict that. How can it say "Again, the resultant quality is markedly reduced..." when there was nothing stated to that effect prior in the article?

—The preceding unsigned comment was added by SalsaShark42 (talk • contribs) .

The first statement was misleading. I changed it. It did seem to give the impression that MJPEG provided better quality than MPEG when there's a lot of motion, but that's an incorrect impression. The degree of compression superiority of older MPEG technology (MPEG-1, for example) over JPEG was primarily the result of interframe prediction. If you don't use the interframe prediction, you get about the same compression capability as JPEG. Not worse. Just not better. In a way it's sort of like saying that if you don't compress the video pictures at all and just use PCM instead you get the advantage that the quality doesn't vary as a function of the picture's spatial frequency content. Maybe the compression is not varying, but it's not very good either. Or maybe it's like saying that if you stick your money under your mattress instead of in a savings account then you have the advantage that your return rate (of zero percent) is independent of the market interest rate fluctuations. -Mulligatawny 23:47, 26 September 2006 (UTC)

can anyone tell me the best way to save Motion Jpeg video files as MP4 files ? When I play these files they look fine but when I try to save them they break up and look very soft. —The preceding unsigned comment was added by Photogold (talk • contribs) .