[FFmpeg-user] Libnvenc live transcode mpeg2 to x264 hls missing key frames?

[ggeorgiev at znet.ca]

Hello Moritz,

You hit the problem: the copy of ffmpeg I was using was quite old - did 
just recompile the latest version from git, plus did update the box 
where it runs to the latest stable debian version (8.3), and it runs 
like charm now! Video plays fine on raspberry pi, and can be started 
from any segment, what was my goal.

Thanks, again,
George.



On 2016-02-05 04:11, Moritz Barsnick wrote:
> On Thu, Feb 04, 2016 at 23:10:08 -0500, Subscriptions at znet.ca wrote:
> 
> Minor complaint:
> 
>> ggeorgiev at gtx690:/var/www/iptv/html$ ffprobe m3u/TEST2/TS-x2645.ts
>> ffprobe version 2.4.git Copyright (c) 2007-2014 the FFmpeg developers
>>    built on Dec 21 2015 20:16:32 with gcc 4.9.2 (Debian 4.9.2-10)
>>    configuration: --enable-libnvenc --enable-libfaac 
>> --enable-libfdk-aac --enable-librtmp --enable-libx264 --enable-gpl 
>> --enable-nonfree
>>    libavutil      54. 10.100 / 54. 10.100
>>    libavcodec     56.  8.102 / 56.  8.102
>>    libavformat    56.  9.101 / 56.  9.101
>>    libavdevice    56.  1.100 / 56.  1.100
>>    libavfilter     5.  1.106 /  5.  1.106
>>    libswscale      3.  1.101 /  3.  1.101
>>    libswresample   1.  1.100 /  1.  1.100
>>    libpostproc    53.  3.100 / 53.  3.100
> 
> If I'm not totally mistaken, this version of ffmpeg is from around
> October 2014. Could you also please test a newer version?
> 
>> So, how it can be that key frames are invisible in the output produced
>> by libnvenc? And if so, how the stream can be played normally if there
>> are no key frames in it?
> 
> Some sources on StackOverflow, which may or may not be correct, claim
> that Apple HLS indeed requires keyframes in each new segment.
> http://stackoverflow.com/q/11640072
> http://stackoverflow.com/a/11644887 (answer to the question above).
> 
> I have no idea though, nor how to get ffmpeg and/or nvenc to ensure
> this.
> 
> Moritz
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