Your symptom (audio kept, video 0x0) means the hardware H.264 encode
silently produced no video samples while the audio was copied. The result
check now parses the moov box and requires a 'vide' handler, so an
audio-only output is treated as a failed attempt: the pipeline walks all
codec x hardware/software configurations (starting with hardware when
enabled) and only reports an error when every one fails, naming what each
attempt returned. Resizing is also skipped entirely unless a smaller
height was requested, keeping the scaler out of the pipeline.
JakeBreath
33ae790bd0