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• How to tell ffmpeg to encode only the latest frames from input pipe (live streaming) ?

  12 mars 2018, par Valdir

  Similar question on another language : How to get the latest frames in ffmpeg, not the next frame

  Well, basically I receive a vp8 webm chunks through sockets and send it to ffmpeg stdin. My problem is that when the network slows down or temporarily stops, ffmpeg output freezes until the expected chunks arrives. When that happens I can see the output "as expected".

  The real problem is that for every glitch, ffmpeg starts to transcoding from the point it stopped, so let’s say I’m streaming my webcam and at 01:01 I have a network glitch. My chunks are still sent from browser, but never received. At this point the video live streaming (on client’s browser) is at let’s say 01:10, and after the network starts to work as expected, ffmpeg starts receiving all chunks at once since 01:01 and encodes it from that point.

  What I want is ffmpeg to encode only the latest chunks in order to keep in sync with the original video being broadcasted. So I want it to discard that part that lagged.

  It seems like the original problem comes from the socket connection, which sends packets in order and can delay depending on the connection.

• FFMPEG Output video quality is getting very low [duplicate]

  7 mars 2018, par Enhance Labs

  This question already has an answer here :

  • ffmpeg - how to apply filters without losing quality
    
    1 answer
    

  i am newer to this FFMPEG. I succesffully create a function where i can merge PNG and Video. But the final output quality is very low and PNG frame is pixelating.

  I tried this :

  ffmpeg.exe -y -i input.file -i water.mark -filter_complex "[1][0]scale2ref[i][m];[m][i] overlay[v]" -map "[v]" -map 0:a? -ac 2 output.file

  What should i do get original PNG frame quality over video.

  Thanks

• ffmpeg : Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  20 novembre 2020, par Alexandre

  I'm experiencing troubles running ffmpeg on my synology. I'm trying to convert .avi video to mp4.

  



  Here is the command :

  



  ffmpeg -i vid20160623.avi -acodec libfaac -b:a 128k -vcodec mpeg4 -b:v 1200k -flags +aic+mv4 -f mp4 vid20160623.mp4

  



  And the logs :

  



  ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.3 (crosstool-NG 1.20.0) 20150311 (prerelease)
  configuration: --prefix=/usr --incdir='${prefix}/include/ffmpeg' --arch=arm --target-os=linux --cross-prefix=/usr/local/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi- --enable-cross-compile --enable-optimizations --enable-pic --enable-gpl --enable-shared --disable-static --enable-version3 --enable-nonfree --enable-libfaac --enable-encoders --enable-pthreads --disable-bzlib --disable-protocol=rtp --disable-muxer=image2 --disable-muxer=image2pipe --disable-swscale-alpha --disable-ffserver --disable-ffplay --disable-devices --disable-bzlib --disable-altivec --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --disable-vaapi --disable-decoder=amrnb --disable-encoder=zmbv --disable-encoder=dca --disable-encoder=ac3 --disable-encoder=ac3_fixed --disable-encoder=eac3 --disable-decoder=dca --disable-decoder=eac3 --disable-decoder=truehd --cc=/usr/local/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-ccache-gcc
  libavutil      54. 27.100 / 54. 27.100
  libavcodec     56. 41.100 / 56. 41.100
  libavformat    56. 36.100 / 56. 36.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.100 /  1.  2.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, avi, from 'vid20160623.avi':
  Metadata:
    encoder         : MEncoder git-ab94fc6-4.4.3
  Duration: 00:20:18.07, start: 0.000000, bitrate: 1197 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 624x352 [SAR 1:1 DAR 39:22], 1056 kb/s, 25 fps, 23.98 tbr, 25 tbn, 23.98 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s
Output #0, mp4, to vid20160623.mp4':
  Metadata:
    encoder         : MEncoder git-ab94fc6-4.4.3
    Stream #0:0: Video: mpeg4, none, q=2-31, 128 kb/s, SAR 351:352 DAR 0:0, 23.98 fps
    Metadata:
      encoder         : Lavc56.41.100 mpeg4
    Stream #0:1: Audio: aac, 0 channels, 128 kb/s
    Metadata:
      encoder         : Lavc56.41.100 libfaac
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
  Stream #0:1 -> #0:1 (mp3 (native) -> aac (libfaac))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


  



  I tried to reduce b:a and b:v but it did not work.

  



  Any help will be welcome.