Been having this problem for a while now where i render a batch file with FFMpeg, but it can stall at any random point. I just left a file to render overnight and it only had a couple of minutes left to render, but it stopped. So now i have an unplayable MP4 4GB file.
How can i recover this file, so i can just render the last few minutes and splice append them together? As i really dont want to start from scratch again only for the same thing to happen. I really need to get a new CPU.
		
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	few Questions .. 
 
 1 - have you tried more forgiving playback tools like VLC?
 2 - Can MPC-BE play it?
 3 - can Media Info be generated from it?
 4 - Have you ran ffprobe on it? Any output?
 5 - is the original file damaged towards the end? seek problems, etc ?
 6 - what container is it in? Mkv, Mp4?
 some containers handle file corruption better than others. [ex: Mkv, Mov]
 
 Tip for future encoding [rendering]:
 - Use a GUI, which can retry, skip, continue or close the already
 rendered part with proper headers when failures occur.There is nothing wrong .. with my environment
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	VLC or MPC wont play it. 
 
 Media Info isn't generating anything besides this
 Not sure how to use ffprobe.Code:General Complete name : D:\Video.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 3.72 GiB 
 
 No, the original file plays fine. It's a 1080i MP4. And is being rendered as an MP4 at 1080p.
 
 Oh the GUI would be handy, and would have saved me alot of hassle before if i knew about it sooner. Thanks for that.
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	As for the 4Gb file, don't bother trying to recover it. 
 IMHO, it is not worth the time and effort. just re-encode
 the file ..
 
 Try Clever FFmeg-GUI ..
 
 Another free tip : use FFmpeg 8.x, it is faster ..
 
 Last edited by videoAI; 31st Aug 2025 at 11:14. There is nothing wrong .. with my environment
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	I'll cut my losses then! Hopefully there'll be no more stalls with the GUI version. 
 
 Shame i can't choose libx264 from the drop down menu, it's what i usually use on my batch files. Would x264 (avc) give me the same quality?
 
 Glad they've just released a faster version of FFmpeg, but will need to figure out how to install it, as can't see any installation file in the folder.
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	In the future use the "-movflags faststart" option. 
 
 <EDIT>
 Nevermind, doesn't work.
 
 Use one of the MP4/MOV repair programs. They copy the MOOV atom from a similar good file onto the end of the bad one.
 </EDIT>Last edited by jagabo; 31st Aug 2025 at 20:19. 
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	It doesn't allow me to choose the output file, just MKV. Some videos i may upload to Youtube, and they recommend uploading in MP4. Does it matter if i keep them as MKV or would i have to remux them to MP4? For quality and compatibility? 
 
 Also when i'm rendering from an AVS file, it deletes the source file (my AVS) after it's done! How can i stop it from doing so?
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