[FFmpeg-user] Unable to play recorded audio and video from webcam using ffmpeg
Vijay Rakesh Munganda
vijayrakeshmunganda at gmail.com
Mon Jan 11 06:36:45 EET 2021
Hi Moritz,
Assuming ffmpeg actually segments like this (and not on keyframes):
> Individual
> frames cannot normally be played, unless they are keyframes. You should
> play the complete segment "playlist" as a whole. ffplay will have
> trouble identifying the streams and codecs in such a short sample:
> I have add keyframes
>
I have added the keyframes option in ffmpeg command as *ffmpeg -f alsa
-thread_queue_size 1024 -i hw:0 -f video4linux2 -i /dev/video0 -c:a aac -ar
48k -t 0:10 -segment_time 00:00.04 -f segment sample-%003d.aac -c:v h264
-force_key_frames "expr:gte(t,n_forced*0.04)" -pix_fmt yuv420p -s:v 640x480
-t 0:10 -r 25 -g 1 -segment_time 00:00.04 -f segment frame-%003d.h264. *But
still I get an error as *frame-001.h264: Invalid data found when processing
input.*
*Console Output:*
configuration: --prefix=/usr --extra-version=0ubuntu0.2
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libflite --enable-libfontconfig
--enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm
--enable-libmp3lame --enable-libmysofa --enable-libopenjpeg
--enable-libopenmpt --enable-libopus --enable-libpulse
--enable-librubberband --enable-librsvg --enable-libshine
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2
--enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx
--enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394
--enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r
--enable-libopencv --enable-libx264 --enable-shared
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, alsa, from 'hw:0':
Duration: N/A, start: 1610338632.931406, bitrate: 1536 kb/s
Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Input #1, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 3405.427360, bitrate: 147456 kb/s
Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480,
147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le (native) -> aac (native))
Stream #1:0 -> #1:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[alsa @ 0x55777d96fe00] ALSA buffer xrun.
[segment @ 0x55777d983d80] Opening 'sample-000.aac' for writing
Output #0, segment, to 'sample-%003d.aac':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc57.107.100 aac
[libx264 @ 0x55777d98fa20] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2
[libx264 @ 0x55777d98fa20] profile High, level 3.0
[libx264 @ 0x55777d98fa20] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options:
cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=1
cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6
lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0
bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=1
keyint_min=1 scenecut=40 intra_refresh=0 rc=crf mbtree=0 crf=23.0
qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[segment @ 0x55777d98dda0] Opening 'frame-000.h264' for writing
Output #1, segment, to 'frame-%003d.h264':
Metadata:
encoder : Lavf57.83.100
Stream #1:0: Video: h264 (libx264), yuv420p, 640x480, q=-1--1, 25 fps,
25 tbn, 25 tbc
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
[segment @ 0x55777d983d80] Opening 'sample-001.aac' for writing
[segment @ 0x55777d98dda0] Opening 'frame-001.h264' for writing
[segment @ 0x55777d98dda0] Opening 'frame-002.h264' for writing
[segment @ 0x55777d98dda0] Opening 'frame-003.h264' for writing
[segment @ 0x55777d98dda0] Opening 'frame-004.h264' for writing
[segment @ 0x55777d98dda0] Opening 'frame-005.h264' for writing
[segment @ 0x55777d98dda0] Opening 'frame-006.h264' for writingA dup=1
drop=0 speed=1.07x
...
[segment @ 0x55777d98dda0] Opening 'frame-018.h264' for writingA dup=5
drop=0 speed=0.714x
...
[segment @ 0x55777d98dda0] Opening 'frame-029.h264' for writingA dup=12
drop=0 speed=0.768x
...
[segment @ 0x55777d98dda0] Opening 'frame-042.h264' for writingA dup=21
drop=0 speed=0.834x
...
[segment @ 0x55777d983d80] Opening 'sample-055.aac' for writingA dup=31
drop=0 speed=0.89x
...
[segment @ 0x55777d98dda0] Opening 'frame-067.h264' for writingA dup=39
drop=0 speed=0.887x
...
[segment @ 0x55777d98dda0] Opening 'frame-081.h264' for writingA dup=49
drop=0 speed=0.92x
...
[segment @ 0x55777d98dda0] Opening 'frame-091.h264' for writingA dup=56
drop=0 speed=0.904x
...
[segment @ 0x55777d98dda0] Opening 'frame-105.h264' for writingA dup=66
drop=0 speed=0.927x
...
[segment @ 0x55777d98dda0] Opening 'frame-119.h264' for writingA dup=76
drop=0 speed=0.944x
...
[segment @ 0x55777d98dda0] Opening 'frame-130.h264' for writingA dup=84
drop=0 speed=0.938x
...
[segment @ 0x55777d98dda0] Opening 'frame-144.h264' for writingA dup=94
drop=0 speed=0.952x
...
[segment @ 0x55777d983d80] Opening 'sample-154.aac' for writingA dup=103
drop=0 speed=0.958x
...
[segment @ 0x55777d98dda0] Opening 'frame-168.h264' for writingA dup=111
drop=0 speed=0.952x
...
[segment @ 0x55777d98dda0] Opening 'frame-182.h264' for writingA dup=121
drop=0 speed=0.962x
...
[segment @ 0x55777d98dda0] Opening 'frame-193.h264' for writingA dup=129
drop=0 speed=0.956x
...
[segment @ 0x55777d98dda0] Opening 'frame-207.h264' for writingA dup=139
drop=0 speed=0.965x
...
[segment @ 0x55777d983d80] Opening 'sample-218.aac' for writingA dup=149
drop=0 speed=0.974x
...
[segment @ 0x55777d98dda0] Opening 'frame-231.h264' for writingA dup=156
drop=0 speed=0.964x
...
[segment @ 0x55777d98dda0] Opening 'frame-249.h264' for writing
frame= 250 fps= 24 q=-1.0 Lsize=N/A time=00:00:10.00 bitrate=N/A dup=168
drop=0 speed=0.98x
video:2707kB audio:149kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
[aac @ 0x55777d98cf00] Qavg: 260.500
[libx264 @ 0x55777d98fa20] frame I:250 Avg QP:26.77 size: 11085
[libx264 @ 0x55777d98fa20] mb I I16..4: 13.4% 72.3% 14.3%
[libx264 @ 0x55777d98fa20] 8x8 transform intra:72.3%
[libx264 @ 0x55777d98fa20] coded y,uvDC,uvAC intra: 54.2% 91.6% 64.5%
[libx264 @ 0x55777d98fa20] i16 v,h,dc,p: 13% 18% 6% 62%
[libx264 @ 0x55777d98fa20] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 16% 6%
7% 6% 12% 5% 10%
[libx264 @ 0x55777d98fa20] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 18% 11% 6%
8% 8% 10% 5% 6%
[libx264 @ 0x55777d98fa20] i8c dc,h,v,p: 58% 20% 15% 7%
[libx264 @ 0x55777d98fa20] kb/s:2216.90
Thanks & Regards,
Vijay Rakesh.
On Sat, Jan 9, 2021 at 8:33 PM Vijay Rakesh Munganda <
vijayrakeshmunganda at gmail.com> wrote:
> Hi Moritz,
>
>
> "-segment_time 00:00.040"?
> Are you trying to create a segment for each single frame?
>
> No, I’m trying to create h264 video and aac audio of every 40ms
> continuously upto 10s. So that I can send these video and audio files as a
> fragments to the AWS kinesis video streams, at cloud end it will get
> combined for playing. When I use ffplay on these samples it plays video,
> but not audio
> https://github.com/awslabs/amazon-kinesis-video-streams-producer-c/tree/master/samples.
> I want to generate similar video and audio files from webcam. Since I’m new
> to ffmpeg I’m unable write correct ffmpeg command, kindly please suggest
> me.
>
> Thanks & Regards,
> Vijay Rakesh
>
> On 09-Jan-2021, at 19:51, Moritz Barsnick <barsnick at gmx.net> wrote:
>
> Hi Vijay,
>
> On Sat, Jan 09, 2021 at 14:33:59 +0530, Vijay Rakesh Munganda wrote:
>
> ffmpeg -f alsa -thread_queue_size 1024 -i hw:0 -f video4linux2 -i
> /dev/video0 -c:a aac -t 0:10 -segment_time 00:00.040
>
> -f segment sample-%003d.aac -c:v libx264 -s:v 640x480 -t 0:10 -r 25 -g 1
> -segment_time 00:00.040 -f segment frame-%003d.h264
>
>
> "-segment_time 00:00.040"?
> Are you trying to create a segment for each single frame?
>
> Assuming ffmpeg actually segments like this (and not on keyframes):
> Individual
> frames cannot normally be played, unless they are keyframes. You should
> play the complete segment "playlist" as a whole. ffplay will have
> trouble identifying the streams and codecs in such a short sample:
>
> [h264 @ 0x7f1220000b80] Format h264 detected only with low score of 1,
> misdetection possible!
>
> [...]
>
> [aac @ 0x7f0ce8000b80] Format aac detected only with low score of 1,
> misdetection possible!
>
>
> The other errors likely also come from missing references.
>
> [aac @ 0x7f0ce8000b80] Estimating duration from bitrate, this may be
> inaccurate
>
> Input #0, aac, from 'sample-000.aac':
>
> Duration: 00:00:00.04, bitrate: 109 kb/s
>
> Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 109 kb/s
>
> 13.16 M-A: 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0
>
>
> Please remember to always post the complete, uncut console output of
> the errored command, in this case ffplay. The output of ffmpeg would
> also have been helpful, but perhaps, in this case, your edited output
> may be enough.
>
> Regards,
> Moritz
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