[FFmpeg-user] significant lag and poor audio sync when combining audio and video

[Neik]

I am trying to combining audio and video for streaming from a Raspberry 
Pi. The audio leads the video by a few seconds, whether I stream the 
output or write it to a file.
The command line is below, The ffmpeg log follows.

raspivid -o - -t 0 -n -w 1280 -h 720 -fps 25 | ffmpeg -report -probesize 
32000 -thread_queue_size 1024 -y -f h264 -r 25 -framerate 25 -i - 
-thread_queue_size 512 -f alsa -ac 1 -channel_layout mono -i hw:1 
-vcodec copy -acodec mp3 -f mpegts udp://44.0.0.95:1234

ffmpeg started on 2015-06-15 at 19:14:26
Report written to "ffmpeg-20150615-191426.log"
Command line:
ffmpeg -report -probesize 32000 -thread_queue_size 1024 -y -f h264 -r 25 
-framerate 25 -i - -thread_queue_size 512 -f alsa -ac 1 -channel_layout 
mono -i hw:1 -vcodec copy -acodec mp3 -f mpegts udp://44.0.0.95:1234
ffmpeg version N-72834-gfd004e1 Copyright (c) 2000-2015 the FFmpeg 
developers
   built with gcc 4.6 (Debian 4.6.3-14+rpi1)
   configuration: --enable-libmp3lame
   libavutil      54. 27.100 / 54. 27.100
   libavcodec     56. 41.100 / 56. 41.100
   libavformat    56. 36.100 / 56. 36.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 16.101 /  5. 16.101
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a 
report) with argument '1'.
Reading option '-probesize' ... matched as AVOption 'probesize' with 
argument '32000'.
Reading option '-thread_queue_size' ... matched as option 
'thread_queue_size' (set the maximum number of queued packets from the 
demuxer) with argument '1024'.
Reading option '-y' ... matched as option 'y' (overwrite output files) 
with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with 
argument 'h264'.
Reading option '-r' ... matched as option 'r' (set frame rate (Hz value, 
fraction or abbreviation)) with argument '25'.
Reading option '-framerate' ... matched as AVOption 'framerate' with 
argument '25'.
Reading option '-i' ... matched as input file with argument '-'.
Reading option '-thread_queue_size' ... matched as option 
'thread_queue_size' (set the maximum number of queued packets from the 
demuxer) with argument '512'.
Reading option '-f' ... matched as option 'f' (force format) with 
argument 'alsa'.
Reading option '-ac' ... matched as option 'ac' (set number of audio 
channels) with argument '1'.
Reading option '-channel_layout' ... matched as option 'channel_layout' 
(set channel layout) with argument 'mono'.
Reading option '-i' ... matched as input file with argument 'hw:1'.
Reading option '-vcodec' ... matched as option 'vcodec' (force video 
codec ('copy' to copy stream)) with argument 'copy'.
Reading option '-acodec' ... matched as option 'acodec' (force audio 
codec ('copy' to copy stream)) with argument 'mp3'.
Reading option '-f' ... matched as option 'f' (force format) with 
argument 'mpegts'.
Reading option 'udp://44.0.0.95:1234' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Applying option y (overwrite output files) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file -.
Applying option thread_queue_size (set the maximum number of queued 
packets from the demuxer) with argument 1024.
Applying option f (force format) with argument h264.
Applying option r (set frame rate (Hz value, fraction or abbreviation)) 
with argument 25.
Successfully parsed a group of options.
Opening an input file: -.
[h264 @ 0x12a83c0] Before avformat_find_stream_info() pos: 0 bytes 
read:4096 seeks:0
[h264 @ 0x12a83c0] Probe buffer size limit of 32000 bytes reached
[h264 @ 0x12a83c0] Stream #0: not enough frames to estimate rate; 
consider increasing probesize
[h264 @ 0x12a83c0] decoding for stream 0 failed
[h264 @ 0x12a83c0] After avformat_find_stream_info() pos: 34816 bytes 
read:53248 seeks:0 frames:3
Input #0, h264, from 'pipe:':
   Duration: N/A, bitrate: N/A
     Stream #0:0, 3, 1/1200000: Video: h264 (High), yuv420p, 1280x720, 25 
fps, 25 tbr, 1200k tbn, 50 tbc
Successfully opened the file.
Parsing a group of options: input file hw:1.
Applying option thread_queue_size (set the maximum number of queued 
packets from the demuxer) with argument 512.
Applying option f (force format) with argument alsa.
Applying option ac (set number of audio channels) with argument 1.
Applying option channel_layout (set channel layout) with argument mono.
Successfully parsed a group of options.
Opening an input file: hw:1.
[alsa @ 0x12cee80] All info found
Input #1, alsa, from 'hw:1':
   Duration: N/A, start: 1434392072.070301, bitrate: 768 kb/s
     Stream #1:0, 1, 1/1000000: Audio: pcm_s16le, 48000 Hz, mono, s16, 
768 kb/s
Successfully opened the file.
Parsing a group of options: output file udp://44.0.0.95:1234.
Applying option vcodec (force video codec ('copy' to copy stream)) with 
argument copy.
Applying option acodec (force audio codec ('copy' to copy stream)) with 
argument mp3.
Applying option f (force format) with argument mpegts.
Successfully parsed a group of options.
Opening an output file: udp://44.0.0.95:1234.
Matched encoder 'libmp3lame' for codec 'mp3'.
Successfully opened the file.
detected 4 logical cores
[graph 0 input from stream 1:0 @ 0x12a82a0] Setting 'time_base' to value 
'1/48000'
[graph 0 input from stream 1:0 @ 0x12a82a0] Setting 'sample_rate' to 
value '48000'
[graph 0 input from stream 1:0 @ 0x12a82a0] Setting 'sample_fmt' to 
value 's16'
[graph 0 input from stream 1:0 @ 0x12a82a0] Setting 'channel_layout' to 
value '0x4'
[graph 0 input from stream 1:0 @ 0x12a82a0] tb:1/48000 samplefmt:s16 
samplerate:48000 chlayout:0x4
[audio format for output stream 0:1 @ 0x12a0390] Setting 'sample_fmts' 
to value 's32p|fltp|s16p'
[audio format for output stream 0:1 @ 0x12a0390] Setting 'sample_rates' 
to value '44100|48000|32000|22050|24000|16000|11025|12000|8000'
[audio format for output stream 0:1 @ 0x12a0390] Setting 
'channel_layouts' to value '0x4|0x3'
[audio format for output stream 0:1 @ 0x12a0390] auto-inserting filter 
'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the 
filter 'audio format for output stream 0:1'
[AVFilterGraph @ 0x1320b60] query_formats: 4 queried, 6 merged, 3 
already done, 0 delayed
[auto-inserted resampler 0 @ 0x1321c60] ch:1 chl:mono fmt:s16 r:48000Hz 
-> ch:1 chl:mono fmt:s16p r:48000Hz
[mpegts @ 0x12bdbf0] muxrate VBR, pcr every 2 pkts, sdt every 200, 
pat/pmt every 40 pkts
Output #0, mpegts, to 'udp://44.0.0.95:1234':
   Metadata:
     encoder         : Lavf56.36.100
     Stream #0:0, 0, 1/90000: Video: h264, yuv420p, 1280x720, q=2-31, 25 
fps, 25 tbr, 90k tbn, 25 tbc
     Stream #0:1, 0, 1/90000: Audio: mp3 (libmp3lame), 48000 Hz, mono, 
s16p
     Metadata:
       encoder         : Lavc56.41.100 libmp3lame
Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #1:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
frame=   11 fps=0.0 q=-1.0 size=     276kB time=00:00:00.44 
bitrate=5130.7kbits/s
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bitrate=4212.8kbits/s
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bitrate=3872.8kbits/s
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bitrate=3664.8kbits/s
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bitrate=3695.1kbits/s
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bitrate=4020.4kbits/s
frame= 1649 fps= 25 q=-1.0 size=   32320kB time=00:01:05.96 
bitrate=4014.0kbits/s
frame= 1661 fps= 25 q=-1.0 size=   32496kB time=00:01:06.44 
bitrate=4006.7kbits/s
frame= 1674 fps= 25 q=-1.0 size=   32685kB time=00:01:06.96 
bitrate=3998.7kbits/s
frame= 1687 fps= 25 q=-1.0 size=   32932kB time=00:01:07.48 
bitrate=3997.9kbits/s
frame= 1699 fps= 25 q=-1.0 size=   33175kB time=00:01:07.96 
bitrate=3999.0kbits/s
frame= 1712 fps= 25 q=-1.0 size=   33507kB time=00:01:08.48 
bitrate=4008.3kbits/s
frame= 1724 fps= 25 q=-1.0 size=   33797kB time=00:01:08.96 
bitrate=4014.9kbits/s
frame= 1737 fps= 25 q=-1.0 size=   34091kB time=00:01:09.48 
bitrate=4019.5kbits/s
frame= 1750 fps= 25 q=-1.0 size=   34451kB time=00:01:10.00 
bitrate=4031.8kbits/s
frame= 1763 fps= 25 q=-1.0 size=   34750kB time=00:01:10.52 
bitrate=4036.7kbits/s
frame= 1775 fps= 25 q=-1.0 size=   35010kB time=00:01:11.00 
bitrate=4039.5kbits/s
[libmp3lame @ 0x1320770] Trying to remove 47 more samples than there are 
in the queue
frame= 1779 fps= 25 q=-1.0 Lsize=   35116kB time=00:01:11.28 
bitrate=4035.7kbits/s
video:31803kB audio:557kB subtitle:0kB other streams:0kB global 
headers:0kB muxing overhead: 8.515517%
Input file #0 (pipe:):
   Input stream #0:0 (video): 1779 packets read (32566370 bytes);
   Total: 1779 packets (32566370 bytes) demuxed
Input file #1 (hw:1):
   Input stream #1:0 (audio): 57720 packets read (6842992 bytes); 57720 
frames decoded (3421496 samples);
   Total: 57720 packets (6842992 bytes) demuxed
Output file #0 (udp://44.0.0.95:1234):
   Output stream #0:0 (video): 1779 packets muxed (32566370 bytes);
   Output stream #0:1 (audio): 2970 frames encoded (3421440 samples); 
2971 packets muxed (570432 bytes);
   Total: 4750 packets (33136802 bytes) muxed
57720 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x1321210] Statistics: 0 seeks, 25491 writeouts
[AVIOContext @ 0x12a7e40] Statistics: 35211617 bytes read, 0 seeks
Received signal 2: terminating.