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

[jd1008]

Please fix the date on your computer.
Your email is dated 02/07/2016 08:06 PM

On 02/07/2016 08:06 PM, ggeorgiev at znet.ca wrote:
> 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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>
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