[FFmpeg-user] Adding audio track to MP4 seems to override the video stream

[Cyle Hunter]

Hi, I built a new binary using the git head as per your suggestion. It seems to run a lot faster now, however, I’m running into the same issue. 

Here’s the mp4 file without audio that I’m testing with:
https://file.io/nV9UTQ

And here’s what the output looks like after the I apply the sound: 
https://file.io/4ls6Is

Here’s the sound file I’ve been testing with:
https://file.io/vF69i2

And here’s the log output on the latest version:

ffmpeg version N-89775-gef21033 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-11)
configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --extra-libs=-lpthread --extra-libs=-lm --bindir=/root/bin --enable-gpl --enable-libfdk_aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree --disable-shared --enable-static
libavutil 56. 7.100 / 56. 7.100
libavcodec 58. 9.100 / 58. 9.100
libavformat 58. 3.100 / 58. 3.100
libavdevice 58. 0.100 / 58. 0.100
libavfilter 7. 11.101 / 7. 11.101
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/62a5980d-b45c-40cb-a52d-0b308fed3b18.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.3.100
Duration: 00:00:46.00, start: 0.000000, bitrate: 3181 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 3180 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
[aac @ 0x45cb4c0] Estimating duration from bitrate, this may be inaccurate
Input #1, aac, from '/var/task/assets/elvis.aac':
Duration: 00:00:48.88, bitrate: 136 kb/s
Stream #1:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 136 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #1:0 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to '/tmp/62a5980d-b45c-40cb-a52d-0b308fed3b18.jpeg.zip.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.3.100
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 3180 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 256 kb/s
Metadata:
encoder : Lavc58.9.100 aac
frame= 1 fps=0.0 q=-1.0 Lsize= 229kB time=00:00:00.02 bitrate=80761.8kbits/s speed=1.73x 
video:227kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.584858%
[aac @ 0x45bec80] Qavg: 51662.707


> On Jan 10, 2018, at 8:19 AM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 
> 2018-01-10 7:37 GMT+01:00 Cyle Hunter <cylehunter at tactica.ca>:
> 
>> I’m trying to add an audio track to an existing MP4 video. It
>> seems when I add the new audio stream the video stream gets
>> corrupted.
> 
> Please test current FFmpeg git head, if the issue is reproducible
> please provide an input sample.
> 
> Carl Eugen
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