hvfvhigh, new ffmpeg, etc

Alan Milewczyk alan at soulman1949.com
Wed Aug 24 08:29:30 PDT 2016

On 24/08/16 10:50, RS wrote:
>> From: RS Sent: Tuesday, August 23, 2016 22:39
>> Unless and until HLS is fixed, FlashHD is the only way to get 
>> 1280x720 25fps unless you re-encode HVFHD to 25fps.
> When I wrote the suggestion of re-encoding HVFHD to 25fps I was 
> assuming that I could use ffmpeg -r 25 to drop alternate frames to 
> reduce the frame rate.  It seems it is not that easy.  h.264 
> identifies the difference from the previous frame and encodes it. If I 
> delete the previous frame it stops working.  I just got a lot of 
> Invalid timestamp errors from ffmpeg.  It seems I have to uncompress 
> the HVFHD, which will result in an enormous file, and then re-encode 
> it at 25fps with libx264.  Does anyone have any ideas how to do it?

I've no experience of doing this with video files but I know that the 
process is not recommended for audio files due to degradation of 
quality. Reluctantly I've decided to take the hit on hard drive space by 
accepting HFVHD @50 frames!


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