since a longtime I do livestream to youtube or twitch with 'copy' codec of raspivid (1280x720@25) and sound from /dev/zero
Now I try to add an audio track from chinese usb mic.
If I use copy audio codec, I get 'pcm_s16le' and combined with video, speed 1x and 25fps but no sounds plays from client.
I saw in twitch requirement, audio needs to be aac, so I change my ffmpeg, but as it runs, I fall to 12/13 fps and I can't reach more than 0.8 speed, too low for livestream.
/usr/bin/raspivid -o - -w 1280 -h 720 -n -t 0 -ex auto -awb auto -fps 25 -b 6000000 | \ /usr/bin/ffmpeg -y -xerror \ -thread_queue_size 32k -f h264 -i - \ -thread_queue_size 128k -f alsa -ar 48000 -ac 1 -i hw:1,0 \ -c:v copy -c:a aac -b:a 128k -strict experimental -g 50 -f flv /tmp/truc.flv (or rtmp url)
at start, I get :
Input #0, h264, from 'pipe:': Duration: N/A, bitrate: N/A Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x720, 25 fps, 25 tbr, 1200k tbn, 50 tbc Guessed Channel Layout for Input Stream #1.0 : mono Input #1, alsa, from 'hw:1,0': Duration: N/A, start: 1621334643.781596, bitrate: 768 kb/s Stream #1:0: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s Output #0, flv, to '/tmp/truc.flv': Metadata: encoder : Lavf57.56.101 Stream #0:0: Video: h264 (High) ( / 0x0007), yuv420p(progressive), 1280x720, q=2-31, 25 fps, 25 tbr, 1k tbn, 1200k tbc Stream #0:1: Audio: aac (LC) ( / 0x000A), 48000 Hz, mono, fltp, 128 kb/s Metadata: encoder : Lavc57.64.101 aac Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Pi is running a "modest" overclock setting (800mhz) with 256Mb for GPU
model name is : ARMv6-compatible processor rev 7 (v6l)
Is this hardware is strong enough to do that ?