Hi all,
I was hoping to get some help on my streaming setup. I am currently working on
some video-related experiments involving streaming H.264-encoded video using
UDP.
My setup:
OS: Ubuntu 18.04.4 LTS (reproduced on Ubuntu 20.04 LTS as well)
Ffmpeg version: N-98617-g533d603 (reproduced with 4.3 as well)
Configuration settings: --prefix=/home/trenton-windows/ffmpeg_build
--pkg-config-flags=--static
--extra-cflags=-I/home/trenton-windows/ffmpeg_build/include
--extra-ldflags=-L/home/trenton-windows/ffmpeg_build/lib
--extra-libs='-lpthread -lm' --bindir=/home/trenton-windows/bin --enable-gpl
--enable-gnutls --enable-libaom --enable-libass --enable-libfdk-aac
--enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
--enable-debug=3 --disable-optimizations --disable-stripping
libavutil 56. 57.100 / 56. 57.100
libavcodec 58. 99.100 / 58. 99.100
libavformat 58. 49.100 / 58. 49.100
libavdevice 58. 11.101 / 58. 11.101
libavfilter 7. 87.100 / 7. 87.100
libswscale 5.
8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Problem Description:
On the same machine, I run the following two commands:
Client side: ffmpeg -y -rtsp_flags listen -timeout 10 -i
rtsp://localhost:12345/live.sdp -c copy test.mp4
Server side: ffmpeg -re -i
TVs_Best_Kisses_Top_50_\(52_to_41\)_kiss_h_nm_np2_le_goo_1.avi -vcodec libx264
-strict 2 -f rtsp -rtsp_transport udp rtsp://localhost:12345/live.sdp
This works without a hitch on ffmpeg 3.4.8-0ubuntu0.2 (installed via apt-get),
and I can open test.mp4 in a media player to view a streamed copy of the input
video file. However, I have since upgraded to the most recent version because I
need to use the -stream_loop functionality, which was buggy in older versions
of ffmpeg. When I run the same commands as above in the updated version,
however, the client side hangs indefinitely. However, it works when I switch
protocol to TCP (using '-rtsp_transport tcp'). This happens regardless of the
input file that I use. When I Ctrl-C the client, I see a file called test.mp4,
but it's unplayable, which I can tell because ffprobe outputs the following:
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e3d718e80] moov atom not found
test.mp4: Invalid data found when processing input
Logs and descriptions
The following files are all hosted at
https://drive.google.com/drive/folders/1oQnh-kAL4x6Zm-kaRDP_9aZgLH9YG2ub?usp=sharing.
ffmpeg-20200803-170914.log: Using ffmpeg version N-98617-g533d603, client-side
command run with addition arguments -report -loglevel 99 -v 9 . This command
hangs.
ffmpeg-20200803-170915.log: Using ffmpeg version N-98617-g533d603, server-side
command run with addition arguments -report -loglevel 99 -v 9 . This works
without a problem.
ffmpeg-20200803-172801.log: Using ffmpeg version 3.4.8-0ubuntu0.2, client-side
command run with addition arguments -report -loglevel 99 -v 9 . This works
without a problem.
ffmpeg-20200803-172802.log: Using ffmpeg version 3.4.8-0ubuntu0.2, server-side
command run with addition arguments -report -loglevel 99 -v 9 . This works
without a problem.
gdb.txt: ffmpeg_g log for the client; with SIGINT at the point where it hangs
(seems like it waits for a packet forever).
TVs_Best_Kisses_Top_50_(52_to_41)_kiss_h_nm_np2_le_goo_1: Input video file for
the commands in these logs, for completeness. The problem I'm describing
happens regardless of which video file I try to stream.
What I've tried (all of these have failed):
* Messed with the client buffer size, by appending buffer_size and
fifo_size arguments to the client-side input URL like so:
'rtsp://localhost:12345/live.sdp?buffer_size=10000000?fifo_size=100000'
* In response to warnings about PTS/DTS issues on the client-side, I added
the options -fflags +genpts+igndts to the client-side command. I also tried
just -fflags +genpts.
* Tried adding -vsync 0 to the server side command as an output option.
* Removed -vcodec libx264 -strict 2 on the server side.
* Removed the -re real-time streaming option on the server side.
* Changed port no. from 12345.
* Tried streaming raw UDP w/o RTSP (still hangs, same issue).
* Client-side command: ffmpeg -y -i udp://localhost:12345/ -c copy
test.mp4
* Server-side command: ffmpeg -y -re -i
TVs_Best_Kisses_Top_50_\(52_to_41\)_kiss_h_nm_np2_le_goo_1.avi -vcodec libx264
-strict 2 -f mpegts udp://localhost:12345/
* Tried using RTP protocol, results in error "[rtp @ 0x561525b9e680] Unable
to receive RTP payload type 96 without an SDP file describing it"
* Client-side command: ffmpeg -i rtp://localhost:12345 -c copy test.mp4
* Server-side command: ffmpeg -y -re -i
TVs_Best_Kisses_Top_50_\(52_to_41\)_kiss_h_nm_np2_le_goo_1.avi -vcodec libx264
-strict 2 -f rtp rtp://localhost:12345/
Networking/systems is certainly not my area of expertise, so I'd appreciate any
help here. Please let me know if there's other logs or information that you'd
find helpful. Thank you in advance.
Best,
Trenton Chang
M.S. Candidate in Computer Science
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