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Yes. By definition, any time you save an audio or video file using a LOSSY compression scheme, you will lose something (by definition). Now, modern codecs have been getting better at minimizing perceptible losses. But it is always preferable to avoid ANY extra compression steps. Until the project is completely finished and ready for distribution, it is ...


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If the codec is not lossless, such as Quicktime Animation Codec; true lossless, then yes. But if you are using a good encoder, I would gather even after 100 generations of degredation would you be able to even visually see the difference if you continually re-encoded the file outputs using MP4 at a high bitrate- say 30mbps for 1080p. Lower bitrates, ...


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MP4 isn't an ideal format for intermediate saves. If you know you'll be re-opening the file, save it as losslessly as practicable, and use MP4 only for the final output. That said, depending on the encoder and settings you probably don't lose much if anything on subsequent saves. MP4 and similar codecs work by decimating the higher frequencies (details, ...


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Yes. Every time you "save" video in video-editor, you will re-render it with codec. Most codecs lose some video information for compression. So, every time you will lose some more information.


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Regular ffmpeg won't do this. You'll need a combination of two tools to carry this out. #1 Use ffmpeg from direct264, a modded version of an old ffmpeg build with a custom filter to modify H264 bitstreams. This build is crippled in most other ways, so rename it or don't put it in your path. ffmpeg -i in.mp4 -vcodec copy -acodec copy -vbsf ...


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You can use ffmpeg, a free command-line tool, to do this: Without letterboxing, NTSC wide pixel-aspect ffmpeg -i input.mp4 -vf "scale=720x480,setdar=16/9" -r 30000/1001 -c:v libx264 -crf 20 -c:a aac -movflags +faststart output.mp4 With letterboxing, NTSC 4:3 pixel-aspect ffmpeg -i input.mp4 -vf "pad=1920:1440:0:180,scale=720x480,setdar=4/3" -r ...


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it seems to me that you are trying to overwrite an existing file. Try to change the name from your file (Test 1.mov) to something different and that is not already used on your Exports folder. Let me know if it worked. Cheers!



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