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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
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Sur d’autres sites (11723)
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FFmpeg C API HLS real time timestamps
7 septembre 2022, par RobinI'm using the FFmpeg C API in C++ to read from a HLS stream. I need to know the real time of each AVPacket. I can extract the pts using
AVPacket::ptsbut that is relative to the start of the stream.

This is how the
.m3u8file looks :

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0

#EXT-X-PROGRAM-DATE-TIME:2022-09-07T14:01:56.612+02:00
#EXTINF:10.322561783,
1662552116.ts
#EXT-X-PROGRAM-DATE-TIME:2022-09-07T14:02:06.935+02:00
#EXTINF:10.320075936,
1662552126.ts

...


The
.m3u8file contains an accurate EXT-X-PROGRAM-DATE-TIME, but how can I extract the one of the currently playing segment ?

Alternatively, the file name of each
.tsfile is the unix timestamp in seconds. Can I extract that somehow ?

If none of those are possibly, is it possible to control the exact number of preloaded segments ? I know the (approximate) segment length is 10 seconds so I could just do the following when receiving the first AVPacket :


start_time = current_time - segment_count * segment_length`
start_pts = first_av_packet.pts


And then to get the time of a later AVPacket, I could do :


packet_time = start_time + new_packet.pts - start_pts


This wouldn't give the same accuracy since the segments are not exactly the same length, but that is okay.


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FFmpeg ERROR : Feed with name 'ffm' for stream 'm3u8' is not defined
7 septembre 2022, par H.W.KimI'm running ffmpeg at :


Ubuntu 18.04.5 LTS
ffmpeg version 3.4.11-0ubuntu0.1


I'm trying to run the video server using ffserver so I modified /etc/ffserver.conf and tagged that .conf file for hls streaming.


/etc/ffserver.conf - added part
<stream>
Feed /etc/feed1.ffm
File "/stream_src/test001/test001.m3u8"
Format mp4
VideoCodec mpeg2video
VideoFrameRate 1
VideoIntraOnly
NoAudio
<stream>
</stream></stream>

But when I runned
ffserver -f /etc/server.conf, it tooks an error as shown :

root@server-itsteam:/home/server# ffserver -f /etc/ffserver.conf
\ffserver version 3.4.11-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
 configuration: --prefix=/usr --extra-version=0ubuntu0.1 --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
/etc/ffserver.conf:164: Setting default value for video bit rate tolerance = 64000. Use NoDefaults to disable it.
/etc/ffserver.conf:164: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
/etc/ffserver.conf:164: Setting default value for video max rate = 128000. Use NoDefaults to disable it.
/etc/ffserver.conf:219: Setting default value for audio sample rate = 22050. Use NoDefaults to disable it.
/etc/ffserver.conf:219: Setting default value for audio channel count = 1. Use NoDefaults to disable it.
/etc/ffserver.conf:219: Setting default value for video bit rate tolerance = 64000. Use NoDefaults to disable it.
/etc/ffserver.conf:219: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
/etc/ffserver.conf:219: Setting default value for video max rate = 512000. Use NoDefaults to disable it.
/etc/ffserver.conf:375: Feed with name '/etc/feed1.ffm' for stream 'test001.m3u8' is not defined
Error reading configuration file '/etc/ffserver.conf': Invalid argument


Why does this error occur ?
And is there any part that causes errors in the syntax I wrote ?


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Stream specifier ':a' in filtergraph description [0:v][0:a][1:v][1:a]concat=a=1:n=2:v=1[s0][s1] matches no streams
6 septembre 2022, par MashI am using ffmpeg-python and I am trying to make a code that gets all the clips from a folder, converts all of them to the same format then merge all of them with their audio to one final video file.


Here is how the python script looks like


import os
import ffmpeg

dir = "./clips/"

# Reshape video
for f in os.listdir(dir):
 (
 ffmpeg
 .input(os.path.join(dir, f))
 .filter("scale", size="hd1080", force_original_aspect_ratio="increase")
 .filter('fps', fps=60, round='up')
 .output(str(os.path.join(dir, f))[:-4] + "_reshaped.mp4")
 .run()
 )

# Select reshaped video
files = []

for f in os.listdir(dir):
 if "_reshaped.mp4" in str(os.path.join(dir, f)):
 files.append(ffmpeg.input(str(os.path.join(dir, f))))

# eparate video and audio, then flat the array
video_and_audios_files = [item for sublist in map(lambda f: [f.video, f.audio], files) for item in sublist]

# concat all
joined = (
 ffmpeg
 .concat(*video_and_audios_files, v=1, a=1)
 .node
)

# merge video and audio
(
 ffmpeg
 .output(joined[0], joined[1], "./out.mp4")
 .run()
)



Now here is my output, this is the output of the part of the code that merges every clip into one (aka the merge video and audio section of the code)


ffmpeg version 5.1.1-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf 
--enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
 libavutil 57. 28.100 / 57. 28.100
 libavcodec 59. 37.100 / 59. 37.100
 libavformat 59. 27.100 / 59. 27.100
 libavdevice 59. 7.100 / 59. 7.100
 libavfilter 8. 44.100 / 8. 44.100
 libswscale 6. 7.100 / 6. 7.100
 libswresample 4. 7.100 / 4. 7.100
 libpostproc 56. 6.100 / 56. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './clips/clip1_reshaped.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf59.27.100
 Duration: 00:00:26.02, start: 0.000000, bitrate: 7432 kb/s
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 7425 kb/s, 60 fps, 60 tbr, 15360 tbn (default) 
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 encoder : Lavc59.37.100 libx264
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from './clips/clip2_reshaped.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf59.27.100
 Duration: 00:00:05.00, start: 0.000000, bitrate: 11445 kb/s
 Stream #1:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, unknown/bt709/unknown, progressive), 1920x1080, 11438 kb/s, 60 fps, 60 tbr, 15360 tbn (default) 
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 encoder : Lavc59.37.100 libx264
Stream specifier ':a' in filtergraph description [0:v][0:a][1:v][1:a]concat=a=1:n=2:v=1[s0][s1] matches no streams.
Traceback (most recent call last):
 File "c:\Users\USERNAME\Desktop\auto_poster\concat_vids.py", line 38, in <module>
 .run()
 File "C:\Users\USERNAME\AppData\Local\Programs\Python\Python310\lib\site-packages\ffmpeg\_run.py", line 325, in run
 raise Error('ffmpeg', out, err)
ffmpeg._run.Error: ffmpeg error (see stderr output for detail)
</module>

Can I get some help please ? I am on Windows 10


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