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• ffmpeg unable to get duration/bitrate of remote gif

  17 février, par Peter Xia

  I'm trying to get the duration of a gif.

  


  The command ffmpeg -i https://cdn.7tv.app/emote/01F6MZGCNG000255K4X1K7NTHR/4x.gif

  


  gives
Duration: N/A, start: 0.000000, bitrate: N/A

  


  However if i download the file and pass it in
ffmpeg -i 4x.gif

  


  it gives :
Duration: 00:00:07.92, start: 0.000000, bitrate: 1225 kb/s

  


  The issue seems limited only to gifs on 7tv site.

  


  

  • It works for other sites. (example : ffmpeg -i https://c.tenor.com/ULCY5B996-oAAAAd/tenor.gif).

  


  • It also works for other encodings of that image (exmaple ffmpeg -i https://cdn.7tv.app/emote/01F6MZGCNG000255K4X1K7NTHR/4x.avif)

  


  


  Here is the HTTP response header from 7tv site of that gif :

  


  HTTP/2 200 
content-type: image/gif
content-length: 1213725
x-7tv-cache-hits: 37527
x-7tv-cache: hit
age: 228365
cache-control: public, max-age=604800, s-maxage=86400, immutable
alt-svc: h3=":443"; ma=2592000
x-7tv-cdn-pod: cdn-ssprq
x-7tv-cdn-node: cdn-1
server: SevenTV
vary: origin, access-control-request-method, access-control-request-headers
access-control-allow-origin: *
access-control-expose-headers: *
date: Sun, 16 Feb 2025 20:47:28 GMT


  


  Can someone help me understand ? Something spcecific to this site is causing ffmpeg to behave differently ?

  


• HlS playlist skip files with ffmpeg

  29 janvier, par tamirg

  I simply downloaded 5 mp3 files from here :
https://samplelib.com/sample-mp3.html

  


  which means i have :

  


  sample-3s.mp3
sample-6s.mp3
sample-9s.mp3
sample-12s.mp3
sample-15s.mp3


  


  and then i create a simple hls playlist sample.m3u8 :

  


  #EXTM3U
#EXT-X-TARGETDURATION:20
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:3.0,
sample-3s.mp3
#EXTINF:6.0,
sample-6s.mp3
#EXTINF:9.0,
sample-9s.mp3
#EXTINF:12.0,
sample-12s.mp3
#EXTINF:15.0,
sample-15s.mp3


  


  But when i play this playlist :

  


  ffplay sample.m3u8


  


  i get :

  


  [hls @ 0x13703b4d0] Opening 'sample-9s.mp3' for reading
[mp3 @ 0x13703b740] invalid concatenated file detected - using bitrate for duration
Input #0, hls, from 'playlist2.m3u8':
  Duration: N/A, start: 0.000000, bitrate: 128 kb/s
  Program 0
    Metadata:
      variant_bitrate : 0
  Stream #0:0: Audio: mp3 (mp3float), 44100 Hz, stereo, fltp, 128 kb/s
      Metadata:
        variant_bitrate : 0
        encoder         : Lavc57.10
2025-01-29 10:57:46.957 ffplay[17029:696588] +[IMKClient subclass]: chose IMKClient_Modern
2025-01-29 10:57:46.957 ffplay[17029:696588] +[IMKInputSession subclass]: chose IMKInputSession_Modern
[hls @ 0x13703b4d0] Opening 'sample-12s.mp3' for reading 0B
[mp3float @ 0x13703c710] Header missingvq=    0KB sq=    0B
[hls @ 0x13703b4d0] Opening 'sample-15s.mp3' for reading 0B


  


  It starts playing from the file sample-9s, and not sample-3s. So it skips the first two files.
Why does it happen ?

  


• ffmpeg video to rtsp not working, ffmpeg is not reading the video frame by frame [closed]

  15 janvier, par Leroy Jeslyn

  Here's the ffmpeg command :

  


  gst-launch-1.0 videotestsrc ! decodebin ! videoconvert ! videoscale \
 ! video/x-raw,width=1280,height=720 ! x264enc speed-preset=ultrafast \
 tune=zerolatency ! rtph264pay ! udpsink host=127.0.0.1 port=5000 sync=false \
 ! rtspserver service=0/test


  


  The output was :

  


  ffmpeg version 7.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers                                   
  built with gcc 14.2.0 (Rev1, 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-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth 
--enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libqui
rc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 
--enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable
-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-
cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-lib
shaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enab
le-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --e
nable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.100 / 61. 19.100
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Render/fire3.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp41isom
    creation_time   : 2025-01-08T13:10:15.000000Z
  Duration: 00:01:21.79, start: 0.000000, bitrate: 12799 kb/s
  Stream #0:0[0x1](und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 12798 kb/s, 14 fps, 14 tbr, 14k tbn (default)
      Metadata:
        creation_time   : 2025-01-08T13:10:15.000000Z
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
        encoder         : AVC Coding
[out#0/rtsp @ 00000178486d9a00] Codec AVOption b:a (set bitrate (in bits/s)) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some decoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0000017848d200c0] using SAR=1/1
[libx264 @ 0000017848d200c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000017848d200c0] profile High, level 3.1, 4:2:0, 8-bit
[libx264 @ 0000017848d200c0] 264 - core 164 r3192 c24e06c - H.264/MPEG-4 AVC codec - Copyleft 2003-2024 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 d
eblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_q
p_offset=-2 threads=22 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 
direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=14 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=1000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00



  


  This is were the output stopped, instead of reading the video frame by frame, it stops here and runs indefinitely. I tried to use VLC and python script to read the rtsp url, but that didn't work.
I tried the alternative using GStreamer, but i couldn't install rtsp-server on Windows 11.

  


  Thank you for your time, any suggestion or answers are appreciated. The end goal is to convert a video to a rtsp url.