[FFmpeg-user] HLS stream delivery problem

andrei ka andrei.k.gml at gmail.com
Tue Sep 22 13:31:17 EEST 2020

(disk io check means use dd utility (cygwin) - write some bytes in parallel
with your ts creation (with dd if=/dev/random of=Y... in windoze speak), or
do it somehow else, check if your drops are only cpu induced, not but dd io)

On Tue, Sep 22, 2020 at 12:26 PM andrei ka <andrei.k.gml at gmail.com> wrote:

> hi
> sometimes it helps to separate encoding & packaging - encode to a
> multicast and read that multicast from another process and repackage it.
> color conversions can eat cpu. what for do you need 2nd scaling to 1080
> after defining that you're grabbing at that resolution, your input should
> be already scaled... can your i7 2600 stand 1 resolution encoding without
> choking ? + as you're writing ts to Y run dd on it, check if you have enuf
> dd io speed left...
> &rei
> On Tue, Sep 22, 2020 at 10:37 AM Theo Kooijmans <tkooijmans at gld.nl> wrote:
>> I have the FFMpeg encoding working fine on a Win10 PC but I have problems
>> with uploading HLS files to a HLS server.
>> This is what I see with CPU load when I transcode from a live
>> Decklinkcard to a local folder.
>> I get a even load on the CPU without big peaks
>> [cid:image001.png at 01D690CB.F6946710]
>> Below overview is when try to upload to a drive letter in windows which
>> is connected to a HLS server.
>> There are now high peaks in CPU load and memory is slowly rising to it's
>> limits.
>> Do you know how to fix this?
>> This is my code with ffmpeg,     Y:\ is drive letter to the HLS server
>> (WebDAV)
>> ffmpeg -thread_queue_size 5096 -f dshow -video_size 1920x1080
>> -pixel_format uyvy422 -rtbufsize 128M -framerate 25.00 -i video="Decklink
>> Video Capture (2)":audio="Decklink Audio Capture (2)" -c:v libx264 -crf 21
>> -filter_complex
>> "[v:0]split=2[vtemp001][vtemp002];[vtemp001]scale=w=960:h=540[vout001];[vtemp002]scale=w=1920:h=1080[vout002]"
>> -preset veryfast -g 25 -sc_threshold 0 -map [vout001] -c:v:0 libx264 -b:v:0
>> 2000k -map [vout002] -c:v:1 libx264 -b:v:1 6000k -map a:0 -c:a aac -b:a
>> 128k -ac 2 -map a:0 -c:a aac -b:a 128k -ac 2 -f hls -hls_time 6
>> -hls_segment_size 6000000 -hls_flags +delete_segments+split_by_time
>> -master_pl_name index.m3u8 -var_stream_map "v:0,a:0 v:1,a:1"
>> "Y:\stream_%v.m3u8"
>> [cid:image002.png at 01D690CB.F6946710]
>> Regards,
>> Theo Kooijmans
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