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• How to record a livestream in ffmpeg or gstreamer and split the files without skipping or duplicating frames

  15 décembre 2020, par Blake Cochrane

  Can somone please recommend a solution for safely recording a live stream to a file that would not produce a corrupted file if the system was unsavely shut down.

  


  I am starting on a project using a battery powered Raspberry Pi 4B.
I am using GStreamer to use the ASIC for Raw Pi camera to h.264 compression to create a RTSP/HLS/RTMP stream.
I need to continuosly record the livestream to a file on the Pi without any duplicate & missing frames or transcoding - eg using -vcodec copy.
As the Pi is battery powered, it can be unsafely shut down randomly when the battery is out of energy.
I know that if a mp4 container isn't 'finalised' with the moov atom before the file finishes writing which would leave the file corrupted/unrepairable and unplayable.
So if I have an mp4 recording of 6 hours that is corrupted and unfixable that is a problem.
My idea was to split the recording to a new file after x amount of minutes or frames or bytes as losing the last few minutes is not so bad as to lose hours of recordings.
I would need to set the last frame in the old file as the previous frame to the next I frame (starting frame) in the new file as a h.264 stream can only start on an I frame.

  


  So it would go like this.
file 1
| Frame |0001|I|
| --- | --- | --- |
|Frame|0002|P|
|Frame|0003|B|
...
| Frame |1524|B|
| --- | --- | --- |
| Frame |1525|P|

  


  file 2
| Frame |1526|I|
| --- | --- | --- |
| Frame |1527|B|

  


  Then all of the split files can be appended to each other without transcoding in ffmpeg.
I don't need to record the live stream directly to an mp4, whatever container it is in can be converted to an mp4 when appending the split files.

  


  There is a python script of the Raspberry pi that accomplishes all of this but it can not be used for a live stream multicast as the Pi camera can not be accessed by more than one process at a time.
Unless there is a way to live stream the latest frames in an mp4 file that is continiously being recorded to, I am stuck.

  


• How to record depth stream from realsense L515

  22 avril 2022, par Bilal

  I have a depth camera (Intel Realsense L515) and I do like to record a video of the depth.

  


  I have seen this answer which is using FFMPEG, but I didn't know how to replicate it in my case !

  


  I'm using this code :

  


  import cv2
import numpy as np
import pyrealsense2 as rs
import time

pipeline = rs.pipeline()
config = rs.config()

"""
# Depth Mode
"""
# Resolution
res = [(1024, 768), (640, 480), (320, 240)]
resolution = res[0]
print("RealSense Resolution:{}\n".format(resolution))

# # initialize video writer
fourcc = cv2.VideoWriter_fourcc('F','F','V','1')
fps = 30
video_filename = 'output.avi'
out = cv2.VideoWriter(video_filename, fourcc, fps, resolution, False)


config.enable_stream(rs.stream.depth, resolution[0], resolution[1], rs.format.z16, 30)
profile = config.resolve(pipeline)
# Start streaming
pipeline.start(config)

# Declare sensor object and set options
depth_sensor = profile.get_device().first_depth_sensor()
depth_sensor.set_option(rs.option.visual_preset, 5) # 5 is short range, 3 is low ambient light
depth_sensor.set_option(rs.option.receiver_gain, 8)
depth_sensor.set_option(rs.option.pre_processing_sharpening, 0.0)
depth_sensor.set_option(rs.option.post_processing_sharpening, 3.0)
depth_sensor.set_option(rs.option.laser_power, 100)
depth_sensor.set_option(rs.option.confidence_threshold, 2)
# Get the sensor once at the beginning. (Sensor index: 1)

# # Filters
threshold_filter = rs.threshold_filter(min_dist=1.2, max_dist=1.4)
temporal_filter = rs.temporal_filter(smooth_alpha=0.1, smooth_delta = 9.0,persistence_control=7)

try:
    # # Filters
    threshold_filter = rs.threshold_filter(min_dist=1.2, max_dist=1.4)
    temporal_filter = rs.temporal_filter(smooth_alpha=0.1, smooth_delta = 75.0,persistence_control=0)

    tic = time.time()

    while True:
        # Wait for depth frames:
        frames = pipeline.wait_for_frames()
        depth_frame = frames.get_depth_frame()
        if not depth_frame:
            continue

        #------------
        # # FILTERS |
        #------------

        depth_frame = threshold_filter.process(depth_frame)
        depth_frame = temporal_filter.process(depth_frame)

        # Convert images to numpy arrays
        depth_array = np.asanyarray(depth_frame.get_data())
        # depth_array = np.asanyarray(colorizer.colorize(depth_frame).get_data())

        out.write(depth_array)
        toc = time.time()
        if(round(toc  - tic) > 30):
            break

finally:
    out.release()
    pipeline.stop()


  


  And getting this error :

  


  


  out.write(depth_array)
cv2.error : OpenCV(4.5.4) /tmp/pip-req-build-kneyjnox/opencv/modules/videoio/src/cap_ffmpeg.cpp:186 : error : (-215:Assertion failed) image.depth() == CV_8U in function 'write'

  


  


  Can you please tell me how can I record the depth from my camera ? thanks in advance.

  


• FFmpeg unable to save file on Android : Output file #0 does not contain any stream

  16 mai 2022, par John M.

  I'm having difficulty when saving a RTSP stream into internal storage using ffmpeg-kit -i rtsp://192.168.100.60:554/stream1 -c:v copy -c:a copy -t 5 /data/user/0/com.arthenica.ffmpegkit.test/files/test.mp4. The command is called using FFmpegKit.executeAsync(command, ...). There're issues with the circular_buffer_size option, but I read that the warnings could be ignored. The command runs fine on desktop using ffmpeg. Please find below the log.

  


  Any advice would be appreciated.

  


  ffmpeg started on 2022-05-16 at 15:27:54
Report written to "/data/user/0/com.arthenica.ffmpegkit.test/cache/ffreport.txt"
Log level: 48
Command line:
ffmpeg-kit -i rtsp://192.168.100.60:554/stream1 -c:v copy -c:a copy -t 5 /data/user/0/com.arthenica.ffmpegkit.test/files/test.mp4
ffmpeg version v4.5-dev-3393-g30322ebe3c Copyright (c) 2000-2021 the FFmpeg developers
  built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
  configuration: --cross-prefix=i686-linux-android- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/storage/light/projects/ffmpeg-kit/prebuilt/android-x86-lts/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=i686 --cpu=i686 --target-os=android --disable-neon --disable-asm --disable-inline-asm --ar=i686-linux-android-ar --cc=i686-linux-android16-clang --cxx=i686-linux-android16-clang++ --ranlib=i686-linux-android-ranlib --strip=i686-linux-android-strip --nm=i686-linux-android-nm --extra-libs='-L/storage/light/projects/ffmpeg-kit/prebuilt/android-x86-lts/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --  libavutil      57. 13.100 / 57. 13.100
  libavcodec     59. 15.102 / 59. 15.102
  libavformat    59. 10.100 / 59. 10.100
  libavdevice    59.  1.100 / 59.  1.100
  libavfilter     8. 21.100 /  8. 21.100
  libswscale      6.  1.102 /  6.  1.102
  libswresample   4.  0.100 /  4.  0.100
Splitting the commandline.
Reading option '-i' ... matched as input url with argument 'rtsp://192.168.100.60:554/stream1'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '5'.
Reading option '/data/user/0/com.arthenica.ffmpegkit.test/files/test.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Successfully parsed a group of options.
Parsing a group of options: input url rtsp://192.168.100.60:554/stream1.
Successfully parsed a group of options.
Opening an input file: rtsp://192.168.100.60:554/stream1.
[tcp @ 0xa21d3a80] No default whitelist set
[tcp @ 0xa21d3a80] Original list of addresses:
[tcp @ 0xa21d3a80] Address 192.168.100.60 port 554
[tcp @ 0xa21d3a80] Interleaved list of addresses:
[tcp @ 0xa21d3a80] Address 192.168.100.60 port 554
[tcp @ 0xa21d3a80] Starting connection attempt to 192.168.100.60 port 554
[tcp @ 0xa21d3a80] Successfully connected to 192.168.100.60 port 554
[rtsp @ 0xb25b5a00] SDP:
v=0
o=- 14665860 31787219 1 IN IP4 192.168.100.60
s=Session streamed by "MERCURY RTSP Server"
t=0 0
a=smart_encoder:virtualIFrame=1
m=video 0 RTP/AVP 96
c=IN IP4 0.0.0.0
b=AS:4096
a=range:npt=0-
a=control:track1
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1; profile-level-id=4D4020; sprop-parameter-sets=Z01AIJWgFAF34maIAAADAAgAAAMBlCA=,aO48gA==

Failed to parse interval end specification ''
[rtsp @ 0xb25b5a00] video codec set to: h264
[rtsp @ 0xb25b5a00] RTP Packetization Mode: 1
[rtsp @ 0xb25b5a00] RTP Profile IDC: 4d Profile IOP: 40 Level: 20
[rtsp @ 0xb25b5a00] Extradata set to 0xb25abdf0 (size: 35)
[rtp @ 0xb25abe60] No default whitelist set
[udp @ 0xb25abed0] No default whitelist set
[udp @ 0xb25abed0] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 0xb25abed0] end receive buffer size reported is 524288
[udp @ 0xb25abf40] No default whitelist set
[udp @ 0xb25abf40] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 0xb25abf40] end receive buffer size reported is 524288
[rtsp @ 0xb25b5a00] setting jitter buffer size to 500
[rtsp @ 0xb25b5a00] hello state=0
Failed to parse interval end specification ''
[h264 @ 0x907e5b00] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x907e5b00] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x907e5b00] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x907e5b00] nal_unit_type: 8(PPS), nal_ref_idc: 3
[rtsp @ 0xb25b5a00] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, rtsp, from 'rtsp://192.168.100.60:554/stream1':
  Metadata:
    title           : Session streamed by "MERCURY RTSP Server"
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0, 0, 1/90000: Video: h264, none, 90k tbr, 90k tbn
Successfully opened the file.
Parsing a group of options: output url /data/user/0/com.arthenica.ffmpegkit.test/files/test.mp4.
Applying option c:v (codec name) with argument copy.
Applying option c:a (codec name) with argument copy.
Applying option t (record or transcode "duration" seconds of audio/video) with argument 5.
Successfully parsed a group of options.
Opening an output file: /data/user/0/com.arthenica.ffmpegkit.test/files/test.mp4.
Output #0, mp4, to '/data/user/0/com.arthenica.ffmpegkit.test/files/test.mp4':
Output file #0 does not contain any stream