Dear All
Video gradually falls behind!
I live stream from a Raspberry Pi with this command:
raspivid -vf -hf -t 0 -v -n -fps 25 -w 1280 -h 720 -b 2000000 --inline
-o - | \
ffmpeg -fflags nobuffer \
-thread_queue_size 4096 -i - \
-thread_queue_size 4096 -f pulse -i
alsa_input.usb-046d_HD_Pro_Webcam_C920_9D715A9F-02.analog-stereo \
-thread_queue_size 4096 -f pulse -i
alsa_output.platform-bcm2835_audio.analog-stereo.monitor \
-c:v copy \
-c:a libmp3lame \
-map 0:v -map 1:a -map 2:a \
-f mpegts udp://192.168.0.101:7000
Output from the above command is:
....
libavcodec 58. 35.100 / 58. 35.100
libavformat 58. 20.100 / 58. 20.100
libavdevice 58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc 55. 3.100 / 55. 3.100
Camera component done
Encoder component done
Starting component connection stage
Connecting camera video port to encoder input port
Enabling encoder output port
Starting video capture
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 : stereo
Input #1, pulse, from
'alsa_input.usb-046d_HD_Pro_Webcam_C920_9D715A9F-02.analog-stereo':
Duration: N/A, start: 1611673439.592751, bitrate: 1536 kb/s
Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Guessed Channel Layout for Input Stream #2.0 : stereo
Input #2, pulse, from
'alsa_output.platform-bcm2835_audio.analog-stereo.monitor':
Duration: N/A, start: 1611673439.612473, bitrate: 1536 kb/s
Stream #2:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #1:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
Stream #2:0 -> #0:2 (pcm_s16le (native) -> mp3 (libmp3lame))
Output #0, mpegts, to 'udp://192.168.0.101:7000':
Metadata:
encoder : Lavf58.20.100
Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x720,
q=2-31, 25 fps, 25 tbr, 90k tbn, 1200k tbc
Stream #0:1: Audio: mp3 (libmp3lame), 48000 Hz, stereo, s16p
Metadata:
encoder : Lavc58.35.100 libmp3lame
Stream #0:2: Audio: mp3 (libmp3lame), 48000 Hz, stereo, s16p
Metadata:
encoder : Lavc58.35.100 libmp3lame
[mpegts @ 0x17469d0] Timestamps are unset in a packet for stream 0. This
is deprecated and will stop working in the future. Fix your code to set
the timestamps properly
Output reaches "speed = 1x" is no time and after that there are no
messages. So I assume encoding and sending over the network in no
bottleneck! Correct?
I view the stream on host 192.168.0.101 with this command:
ffplay -fflags nobuffer -f mpegts -i udp://192.168.0.101:7000
Output from the above command is:
h264 @ 0x7fc11453b280] non-existing PPS 0 referenced 0B f=0/0
Last message repeated 1 times
[h264 @ 0x7fc11453b280] decode_slice_header error
[h264 @ 0x7fc11453b280] no frame!
[h264 @ 0x7fc11453b280] non-existing PPS 0 referenced 0B f=0/0
Last message repeated 1 times
[h264 @ 0x7fc11453b280] decode_slice_header error
[h264 @ 0x7fc11453b280] no frame!
[h264 @ 0x7fc11453b280] non-existing PPS 0 referenced 0B f=0/0
Last message repeated 1 times
[h264 @ 0x7fc11453b280] decode_slice_header error
[h264 @ 0x7fc11453b280] no frame!
Input #0, mpegts, from 'udp://192.168.0.101:7000':sq= 0B f=0/0
Duration: N/A, start: 2346.534522, bitrate: N/A
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B),
yuv420p(progressive), 1280x720, 25 fps, 25 tbr, 90k tbn, 180k tbc
Stream #0:1[0x101]: Audio: mp3 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, fltp, 128 kb/s
Stream #0:2[0x102]: Audio: mp3 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, fltp, 128 kb/s
Switch audio stream from #1 to #2 0KB vq= 0KB sq= 0B f=0/0
2374.89 A-V: 0.030 fd= 2 aq= 0KB vq= 0KB sq= 0B f=0/0
And the video I see is fine!
When I watch the video I note the following delays:
video is delayed 1 sec.
first audio is delayed 0.5 sec.
second audio is delayed 1 sec.
The problem is that as time passes the video falls more and more behind.
After streaming for about 40 min. I note the following delays:
video is delayed 2 sec.
first audio is delayed 0.5 sec.
second audio is delayed 1 sec.
What can I do to prevent the video from falling more and more behind?
Thanks
Thomas S
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