Hi there, I'm struggling to build a command that will synchronise xstack content, as a "stretch goal" I'd like to also keep audio in sync, but that is less important.
It appears that because each input is started in sequence, and then buffered
until all inputs are active, the first input can be minutes old by the time the
stack is ready to display.
This is for live content, not generating a mosaic of pre-recorded content.
I feel like what I need to be doing is dropping frames from any active input
until all the inputs are active - but I just can't work out how to do that.
Really appreciate any advice on things I may be doing wrong. The goal is a live
3x3 mosaic of inputs. The inputs are currently sourced from UDP broadcast
traffic inside a docker network.
The command currently:
ffmpeg -nostdin \-hide_banner \
-loglevel \
${FFMPEG_LOG_LEVEL:-error} \
-err_detect \
ignore_err \
-y \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_ONE} \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_TWO} \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_THREE} \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_FOUR} \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_FIVE} \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_SIX} \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_SEVEN} \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_EIGHT} \
-hwaccel \
cuda \
-fflags \
nobuffer \
-flags \
low_delay \
-fflags \
+genpts+discardcorrupt \
-thread_queue_size \
${FFMPEG_THREAD_QUEUE_SIZE:-4096} \
-i \
${SOURCE_NINE} \
-filter_complex \
[0:v]setpts=PTS-STARTPTS,scale=nhd[a0];[1:v]setpts=PTS-STARTPTS,scale=nhd[a1];[2:v]setpts=PTS-STARTPTS,scale=nhd[a2];[3:v]setpts=PTS-STARTPTS,scale=nhd[a3];[4:v]setpts=PTS-STARTPTS,scale=nhd[a4];[5:v]setpts=PTS-STARTPTS,scale=nhd[a5];[6:v]setpts=PTS-STARTPTS,scale=nhd[a6];[7:v]setpts=PTS-STARTPTS,scale=nhd[a7];[8:v]setpts=PTS-STARTPTS,scale=nhd[a8];[a0][a1][a2][a3][a4][a5][a6][a7][a8]xstack=inputs=9:layout=0_0|w0_0|w0+w1_0|0_h0|w0_h0|w0+w1_h0|0_h0+h1|w0_h0+h1|w0+w1_h0+h1:shortest=1,fps=24[out]
\
-map \
[out] \
-codec:v \
h264_nvenc \
-preset:v \
medium \
-b:v \
16384k \
-maxrate \
16384k \
-bufsize \
16384k \
-pix_fmt \
yuv420p \
-g \
48 \
-map \
0:a? \
-c:a \
aac \
-map \
1:a? \
-c:a \
aac \
-map \
2:a? \
-c:a \
aac \
-map \
3:a? \
-c:a \
aac \
-map \
4:a? \
-c:a \
aac \
-map \
5:a? \
-c:a \
aac \
-map \
6:a? \
-c:a \
aac \
-map \
7:a? \
-c:a \
aac \
-map \
8:a? \
-c:a \
aac \
-metadata \
title=Mosaic \
-metadata \
service_provider=ffmpeg \
-max_muxing_queue_size \
9000000 \
-threads \
0 \
-f \
matroska \
tcp://0.0.0.0:${STREAMING_TCP_PORT:-7000}?listen=1&tcp_mss=1360
Regards, Troy
Brevity is the elixir of life.
Father Hector McGrath, Pixie 2020
publickey - troy@troykelly.com - 0x3DB9B3FB.asc
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