[FFmpeg-user] QSV Decoding and QSV Encoding Live Stream

Jose Luis Bravo josezkaos at gmail.com
Sat Jan 6 12:40:36 EET 2018

QSV Decoder in FFMPEG needs video stream to start with an I Frame.

Live Streams usually does not get an I Frame at the begging, and FFMPEG
using QSV Decoder returns error.

I've get to decode and encode a Live Stream using QSV using a workaround
(copying the live stream into a pipe, and then transcoding that pipe usign
QSV Decoder/Encoder):

ffmpeg -i "
-vcodec copy -acodec copy -f mpegts pipe:1|ffmpeg.exe -hwaccel qsv -vcodec
h264_qsv -i pipe:0 -vcodec h264_qsv -bufsize 4M -b:v 3200k -r 50 -map 0:a:0
-map 0:v:0 -vf deinterlace_qsv -acodec aac -ab 256k -ar 48000 -async 1 -y

The thing is I need to put the command line into a third program which
doesn't support pipes ("|")...

Is there anyway to get FFMPEG discard the beggining of the live stream
until it gets an IFrame, seek to an IFrame in an input buffer or similar
without using a pipe "|" ?

Thanks in advance.

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