Newest 'ffmpeg' Questions - Stack Overflow
Articles published on the website
-
android ndk-build ffmpeg libffmpeg.so: unsupported ELF file type 2
11 September 2014, by rosenwhen ndk-build ffmpeg, i got the error:
/home/rosen/develop/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: error: ./obj/local/armeabi/libffmpeg.so: unsupported ELF file type 2 collect2: ld returned 1 exit status make: * [obj/local/armeabi/libmain.so] Error 1
What can I do to fix this, and make it work?
this is ndk build again using V=1
[armeabi] SharedLibrary : libmain.so /home/rosen/develop/android-ndk-r10/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ -Wl,-soname,libmain.so -shared --sysroot=/home/rosen/develop/android-ndk-r10/platforms/android-9/arch-arm ./obj/local/armeabi/objs/main/__/SDL/src/main/android/SDL_android_main.o ./obj/local/armeabi/objs/main/tutorial01.o -lgcc ./obj/local/armeabi/libffmpeg.so ./obj/local/armeabi/libSDL2.so -no-canonical-prefixes -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -L/home/rosen/develop/android-ndk-r10/platforms/android-9/arch-arm/usr/lib -lGLESv1_CM -lGLESv2 -llog -lc -lm -o ./obj/local/armeabi/libmain.so /home/rosen/develop/android-ndk-r10/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: ./obj/local/armeabi/libffmpeg.so: unsupported ELF file type 2 collect2: error: ld returned 1 exit status make: * [obj/local/armeabi/libmain.so] Error 1
-
Add .mts and .mov support to node-webkit
11 September 2014, by J4GI'm trying to create a basic video editor using node-webkit. Obviously, the video format support in Chrome is a huge limiting factor. I know that adding ffmpegsumo.dll adds support for .mp3 and h264. As far as I can tell, there are two options for me. Either I convert every video clip, live, using an ffmpeg stream, OR, I modify ffmpegsumo.dll to add support for the other video file types.
So far I have been unsuccessful in accomplishing either. Using fluent-ffmpeg I recieve an error
An error occurred: ffmpeg exited with code 1
whenever I try to use .writeToStream(). Can anyone advice me in how to proceed?
-
Video quality when desktop recording is bad
11 September 2014, by bobbyrne01Trying to record my desktop and also audio with
RHEL6.
I'm using the command below, but the quality of the video output is not good.
It is very blurry and I can bearly make out text on screen.
The audio is good so no issues there.Does anyone know how the make the video quality any better?
ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -s $(xwininfo -root | grep 'geometry' | awk '{print $2;}') -r 25 -i :0.0 -sameq -f mpeg -ar 48000 -s wvga -y sample.avi -
FFMPEG Cutting Commercials puts audio out of sync
11 September 2014, by JaBbAUbuntu 14.04.1 with the real ffmpeg loaded (same problem with the avconv version).
I'm trying to take files created in MythTV with a HDPVR, cut the commercials and put the video into an MP4 container for use with MythRoku.
the command
ffmpeg -i $file -acodec copy -vcodec copy -f mp4 file.mp4Works fine. Once I update the database, I can watch the file in MythRoku or Plex.
However, when I try to cut out the commercials, the audio gets out of sync by just over 1 second (audio delayed) whenever I cut past the 0 mark. Totem Video player and VLC both play the resulting video fine, but I can see a "hitch" at the beginning while they are syncing the audio, so I know the information on the audio sync is in the file somewhere. Mythroku and Plex both are out of sync when playing the file. The MythTV Frontend player actually does play it correctly, and I can hear the "hitch" as it syncs the audio.
After hours of reading posts and playing with settings, I've got it down to this:
If I say:
ffmpeg -i $file -acodec copy -vcodec copy -f mp4 -ss 0 -tout.mp4 The file is fine, plays both locally and in MythRoku/Plex
But if I advance the start any amount - even 1 second - audio is out of sync
ffmpeg -i $file -acodec copy -vcodec copy -f mp4 -ss 1 -tout.mp4 I've tried splitting the video (as mp4) and audio (as ac3) first, splitting them separately, and then putting them back together as the last step, but I get the same results.
The information is in the file - Totem, VLC and the Frontend all can figure it out. How can I get ffmpeg to figure out the sync and write the file so it's correct?
Original file:
mythtv@marvin:~$ mediainfo /var/lib/mythtv/recordings/2225_20140824001500.mpg General ID : 0 (0x0) Complete name : /var/lib/mythtv/recordings/2225_20140824001500.mpg Format : MPEG-TS File size : 4.03 GiB Duration : 1h 45mn Overall bit rate mode : Variable Overall bit rate : 5 491 Kbps Video ID : 4113 (0x1011) Menu ID : 1 (0x1) Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L4.0 Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Format settings, GOP : M=4, N=32 Codec ID : 27 Duration : 1h 45mn Bit rate mode : Variable Bit rate : 4 831 Kbps Maximum bit rate : 20.0 Mbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate : 59.940 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.087 Stream size : 3.55 GiB (88%) Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 Audio ID : 4352 (0x1100) Menu ID : 1 (0x1) Format : AC-3 Format/Info : Audio Coding 3 Mode extension : CM (complete main) Format settings, Endianness : Big Codec ID : 129 Duration : 1h 45mn Bit rate mode : Constant Bit rate : 384 Kbps Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 KHz Bit depth : 16 bits Compression mode : Lossy Delay relative to video : -6ms Stream size : 289 MiB (7%)File cut from 0:
mythtv@marvin:~$ mediainfo 2225_20140824001500_1.mp4 General Complete name : 2225_20140824001500_1.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom File size : 58.5 MiB Duration : 1mn 45s Overall bit rate mode : Variable Overall bit rate : 4 676 Kbps Writing application : Lavf54.63.104 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L4.0 Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Format settings, GOP : M=4, N=32 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 1mn 45s Bit rate mode : Variable Bit rate : 4 281 Kbps Maximum bit rate : 20.0 Mbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Variable Frame rate : 59.940 fps Minimum frame rate : 59.920 fps Maximum frame rate : 59.960 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.077 Stream size : 53.6 MiB (92%) Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 Audio ID : 2 Format : AC-3 Format/Info : Audio Coding 3 Mode extension : CM (complete main) Format settings, Endianness : Big Codec ID : ac-3 Duration : 1mn 45s Bit rate mode : Constant Bit rate : 384 Kbps Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 KHz Bit depth : 16 bits Compression mode : Lossy Stream size : 4.81 MiB (8%)File cut from 1 second with audio sync problem:
mythtv@marvin:~$ mediainfo 2225_20140824001500_2.mp4 General Complete name : 2225_20140824001500_2.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom File size : 68.0 MiB Duration : 2mn 0s Overall bit rate mode : Variable Overall bit rate : 4 750 Kbps Writing application : Lavf54.63.104 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L4.0 Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Format settings, GOP : M=4, N=32 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 1mn 58s Bit rate mode : Variable Bit rate : 4 394 Kbps Maximum bit rate : 20.0 Mbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Variable Frame rate : 59.940 fps Minimum frame rate : 59.920 fps Maximum frame rate : 59.960 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.080 Stream size : 62.3 MiB (92%) Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 Audio ID : 2 Format : AC-3 Format/Info : Audio Coding 3 Mode extension : CM (complete main) Format settings, Endianness : Big Codec ID : ac-3 Duration : 2mn 0s Bit rate mode : Constant Bit rate : 384 Kbps Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 KHz Bit depth : 16 bits Compression mode : Lossy Stream size : 5.49 MiB (8%) -
ffmpeg to convert .avi, .mp4, .mp3, .flv, .mkv to mp4
10 September 2014, by Mikael MezioI searching for a script that contains all of that attributes like the title.
I have done one simple but that is only for one attribute so far and i do not want one script for each of all attributes to not be confused.
Like this, running the script for like 10 minutes to see if there is any file that consist .flv and the automatic doing a convert for the file to a mp4 attribute.
#!/bin/bash # Convert all flv to mp4 ext=.mp4 for file in *.flv; do currmov=$file$ext ffmpeg -r 15 -i $file -b 296k -s 640x320 -vcodec mpeg4 -acodec aac $currmov doneThanks for help! /M
