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Rather than using constant bitrate, have a go using constant quality (AKA constant rate factor, or crf). So instead of -b:v 2000 use -crf 23 (adjust the number to change the quality, higher is smaller / lower quality and lower is larger / better quality). Constant quality usually gives you more bang for your bits, as it skimps on bitrate where it's not ...


3

HDV camera, right? It's not untypical for cameras to claim higher resolution than they actually scan. In such cases you have to look at the different aspect ratios involved: pixel, frame, display, sample. Here's a post that discusses this, or google "HDV aspect ratio". And here's a link to the spec from the HDV consortium. It's essentially anamorphic. The ...


2

Get ffmpeg Download a recent build of ffmpeg. Binaries for Windows, Linux, and OS X are available on the FFmpeg Download page. Development is very active and there is no need to use buggy avconv (note that this answer was written for ffmpeg, so I'm not sure if any examples will work with avconv). Theora video & Vorbis audio in OGG Theora is old and ...


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Use: $ avconv -i video.mp4 -vcodec copy video.ogg this should work, the -vcodec copy option copies the video track from mp4 container into the ogg container. If it does not work, see: $ avconv -codecs the -codecs option to see which are supported by your program. That depends on the libraries linked after compilation of the source. See the manual: ...


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Use the overlay filter: ffmpeg -loop 1 -i image.jpg -i overlay.mp4 -filter_complex \ "overlay=main_w-overlay_w:main_h-overlay_h:shortest=1" output.mp4


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Your command is missing double quotes around the filter definition : ffmpeg -i input.mp4 -vf "delogo=x=270:y=190:w=40:h=40" -c:a copy output.mp4 (as explained in FFmpeg filters documentation) Nevertheless, this filter will decode and re-encode your video stream.


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Containers like LXF/GXF/MXF allow EIA-708 (VBI) streams but as far as I know they do not encode the video data -- the blanking interval -- that originally contained those streams. That would run counter to the idea that codecs embody, that of squeezing out redundant information. I could be wrong, but I've never seen or heard of a codec that encodes invisible ...


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Did you actually get every second frame? My impression is that you got every frame, but you halved the framerate. Therefore, the length of the video in seconds is twice as long for the first compared to the second, and assuming equal rate controls (e.g. 1 megabit per second), the twice-as-long-file will thus be approximately twice as big, which is what you ...



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