Error: FFmpeg error: Stream mapping:

[xat]

Error: FFmpeg error: Stream mapping:

[xat]

can you update to the latest castnow version and run it with --debug and then paste the output here?

[ahmet2mir]

[core] launching...
[localfile] started webserver on address 192.168.1.93 using port 60661
[transcode] started webserver on address 192.168.1.93 using port 48881
[core] player status: loading plugins
[core] player status: scanning
[core] player status: connecting
[core] player status: launching
[core] player status: loading
[transcode] incoming request for path http://192.168.1.93:60661/0
[localfile] incoming request serving ./myvideo.avi
[transcode] transcoding error [Error: FFmpeg error: Stream mapping:]

[xat]

Thank You. I guess I have to setup a VM with the latest ubuntu version (with avconv) to be able to debug this.

[ahmet2mir]

You can use Vagrant https://docs.vagrantup.com/v2/installation/, I published a testing environment in my repo

git clone https://github.com/ahmet2mir/vagrant-castnow
cd vagrant-castnow
vagrant up # will download trusty image then install castnow
vagrant ssh # ssh the image

In the image

wget http://mirrorblender.top-ix.org/peach/bigbuckbunny_movies/big_buck_bunny_1080p_h264.mov
wget http://mirrorblender.top-ix.org/peach/bigbuckbunny_movies/big_buck_bunny_1080p_surround.avi

#works
castnow ./big_buck_bunny_1080p_h264.mov --myip <ip of image> 
#failed
castnow ./big_buck_bunny_1080p_surround.avi --tomp4 --myip <ip of image> --debug

Quit image and destroy it

vagrant destroy

You can test ffmpeg, it works

[xat]

Thanks for the Vagrant instructions, it helped me to quickly set it up and reproduce the problem. :-)

Here are my findings:

The actual ffmpeg command which is created by the stream-transcode-module to transcode the input file on the fly is this:

ffmpeg -i - -vcodec h264 -f mp4 -movflags frag_keyframe+faststart -strict experimental pipe:1

You can test it separated from castnow like this:

cat video.avi | ffmpeg -i - -vcodec h264 -f mp4 -movflags frag_keyframe+faststart -strict experimental pipe:1

The Problem seems to be caused by the faststart option. If that is removed, transcoding works. So avconv seems to have a problem with that particular option.

I'm not quite sure if we need the faststart option. Maybe it could just be workarouned for avconv-users like this (update to castnow v0.4.2 before, there was a bug with custom ffmpeg options):

castnow video.avi --tomp4 --ffmpeg-movflags frag_keyframe

[ahmet2mir]

It works! Awesome!

castnow ./myvideo.avi --tomp4 --ffmpeg-movflags frag_keyframe --myip 192.168.1.1

Thanks for your help and your time.

[ahmet2mir]

Still have the issue on Debian Wheezy

castnow ./big_buck_bunny_1080p_surround.avi --tomp4 --ffmpeg-movflags faststart --myip 192.168.1.74 --debug
[core] launching...
[localfile] started webserver on address 192.168.1.74 using port 34488
[transcode] started webserver on address 192.168.1.74 using port 59367
[core] player status: loading plugins
[core] player status: scanning
[core] player status: connecting
[core] player status: launching
[core] player status: loading
[transcode] incoming request for path http://192.168.1.74:34488/0
[localfile] incoming request serving ./big_buck_bunny_1080p_surround.avi
[transcode] transcoding error [Error: FFmpeg error: Stream mapping:]

You can test with the same repo of my vagrant ubuntu, you have Vagrantfile.debian and install.sh.debian, juste remove .debian and vagrant up :)

For Debian, you need to replace h264 by libx264 in transcode.js (in install script)

[xat]

I can reproduce it and will look into it :)

[xat]

Hmm, this is the full error:

vagrant@castnow:~/castnow$ cat ./big_buck_bunny_1080p_surround.avi | ffmpeg -i - -vcodec libx264 -f mp4 -movflags frag_keyframe -strict experimental pipe:1
avconv version 0.8.16-6:0.8.16-1, Copyright (c) 2000-2014 the Libav developers
  built on Sep 16 2014 23:10:48 with gcc 4.7.2
Input #0, avi, from 'pipe:':
  Metadata:
    encoder         : AVI-Mux GUI 1.17.7, Aug  8 2006  20:59:17
    JUNK            : 
  Duration: 00:09:56.45, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: mpeg4 (Simple Profile), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 24 tbr, 24 tbn, 24 tbc
    Stream #0.1: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
[buffer @ 0xb206c0] w:1920 h:1080 pixfmt:yuv420p
[libx264 @ 0xb24920] using SAR=1/1
[libx264 @ 0xb24920] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle Cache64
[libx264 @ 0xb24920] profile Main, level 4.0
[libx264 @ 0xb24920] 264 - core 123 r2189 35cf912 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=0 b_adapt=1 b_bias=0 direct=1 weightb=0 open_gop=1 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.25 aq=1:1.00
[mp4 muxer @ 0x1312c60] [Eval @ 0x7fff4c375e50] Undefined constant or missing '(' in 'frag_keyframe'
[mp4 muxer @ 0x1312c60] Unable to parse option value "frag_keyframe"
[mp4 muxer @ 0x1312c60] Error setting option movflags to value frag_keyframe.
Output #0, mp4, to 'pipe:1':
  Metadata:
    encoder         : AVI-Mux GUI 1.17.7, Aug  8 2006  20:59:17
    JUNK            : 
    Stream #0.0: Video: libx264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], q=-1--1, 90k tbn, 24 tbc
    Stream #0.1: Audio: aac, 48000 Hz, 5.1, s16, 200 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 -> libx264)
  Stream #0:1 -> #0:1 (ac3 -> aac)
Could not write header for output file #0 (incorrect codec parameters ?)

Seems it has todo something with the bug mentioned here:

https://bugzilla.libav.org/show_bug.cgi?id=287

[xat]

In that bug report they state "This flag simply doesn't exist in the 0.8 release.". So I guess you have to update to avconv 9.x in order to get it to work. The ubuntu VM had avconv v9.16 installed.. that should be the reason it worked there.

[ahmet2mir]

I change the vagrantfile to use jessie repo instead of wheezy.
Now libav-tools user version 6:11-2 and it works :)